Hair Fall in Monsoon? How Much Is Normal and What Your Tap Water Adds

Last updated: 8 October 2026

Quick Answer: Hair fall in monsoon is mostly normal seasonal shedding, and it settles on its own. Seasonal studies put the hair cycle's shedding peak in summer, with visible fall following weeks later. Losing 50 to 100 hairs a day is normal; steady counts above 150, clumps or bald patches are a reason to see a doctor.

Yes, hair fall in monsoon is real, and for most people it is normal seasonal shedding rather than lasting damage. Hair sheds in cycles, and those cycles are not spread evenly across the year.

Three things stack up between June and September. Humid air swells and dries the hair shaft over and over, a scalp that stays damp flakes and itches more, and the water at your tap shifts with the rain.

Medical causes come first. Thyroid problems, low iron, hormones and genetics cause shedding that no season or water explains, and a doctor decides those. Water and weather change how bad it looks, not why it happens.

Does hair fall actually increase in the monsoon?

Yes, though the pattern is broader than the monsoon alone. Shedding rises through the warm months and settles in winter, and most people notice a sudden spike because they count hair on wash days.

Two studies set the pattern. A study of 823 otherwise healthy women who had complained of hair loss, tracked over six years, found the highest share of resting (telogen) hairs in summer, a smaller peak in spring and the lowest telogen rates in late winter (Kunz and colleagues, Dermatology, 2009).

An earlier UK study of 14 men counted the most shed hairs around August and September, about 60 a day, more than double the count of the preceding winter (Randall and Ebling, British Journal of Dermatology, 1991).

Telogen is the resting phase that ends in shedding, so a summer peak surfaces as visible fall weeks later, during the Indian monsoon. Both studies were done in Europe, so read the timing as a pattern, not a calendar. Winter is the low point, and our guide to hair fall in winter explains why it can still look worse then.

The American Academy of Dermatology puts normal shedding at 50 to 100 hairs a day, while the British Association of Dermatologists counts 30 to 150 as normal, so the guides disagree at the top end.

How do you count your hair fall at home?

Count for seven days, not one wash day. Collect fallen hairs from your pillow, comb and drain each day, add them up, and compare your daily average with the ranges below. Count on non-wash days too, because washing dislodges hairs that were already loose and makes one day look worse than it is.

Day	Pillow	Comb or brush	Drain	Day total	Bulb or no bulb?
Day 1
Day 2
Day 3
Day 4
Day 5
Day 6
Day 7

Daily average over 7 days	What it means	What to do
Under 100	Normal on every guideline	Nothing, unless you also see patches or clumps
100 to 150	Normal on one guideline, high on the other	Recount next week and think back 2 to 3 months for a trigger
Over 150 on most days, or clumps	Above every normal range	See your doctor and ask about ferritin and thyroid (TSH) tests

Bulb or no bulb: lay 10 to 20 fallen hairs on a dark surface and look at the root end. A shed hair is full length with a small white bulb of keratin at the root (a club hair); that is the hair cycle, and water does not cause it. A hair with no bulb and a blunt or frayed end has snapped, which is breakage, the kind that hard water, heat and rough handling can add.

In telogen effluvium, the heavy shedding that follows a trigger, Cleveland Clinic puts the count at up to 300 hairs a day. Anywhere near that is a reason to see a doctor rather than wait out the season.

Why does humidity make hair fragile?

Humid air makes hair absorb and release moisture repeatedly, and that constant swelling and drying roughens the outer cuticle, which is why hair frizzes in the monsoon. Hair does not fall out from this, but it snaps more easily along the length, which reads as thinning even when the roots are fine.

Handle wet hair gently. The AAD advises wrapping hair in a towel or T-shirt rather than rubbing it dry, and tying it up damp under a helmet or dupatta keeps it wet for hours. Our guide on breakage versus real hair loss walks through the difference.

Why does the scalp flake and itch more in the rainy season?

Partly because the scalp stays damp for longer, and partly because dandruff, dry scalp and hard-water residue look alike. The evidence on humidity itself is mixed, so work out which flaking you have before buying anything.

A 2025 review lists climatic variations, particularly humidity and cold, among factors that may influence seborrheic dermatitis, the condition behind most dandruff. The AAD, by contrast, says many people find it eases in warm, humid weather and flares in cold, dry weather. The sources disagree.

The yeast involved, Malassezia, feeds on skin oils. Hard water adds its own residue: a 2015 review in the Indian Journal of Dermatology notes that calcium and magnesium form an insoluble "scum" on scalp and hair that may cause itching and worsen seborrheic dermatitis.

What you notice	Likely cause	What usually helps
Flakes with greasy scale or redness, itch, back within days of washing	Dandruff (seborrheic dermatitis)	A dandruff shampoo with zinc pyrithione, selenium sulfide or ketoconazole, left on for 5 to 10 minutes
Tightness and fine flaking, worse after harsh shampoo or in dry, cold air	Dry scalp	A gentle, non-medicated shampoo
A dull film and chalky feel that does not rinse clean, plus white crust on taps	Hard-water residue	A shampoo with a chelating agent such as EDTA now and then, and less hardness at the tap
Itchy or sore red bumps around hair follicles	Possible folliculitis	See a dermatologist

If you are unsure which you have, telling dandruff from hard-water flaking is the place to start, and persistent itchy bumps may be scalp folliculitis rather than either.

Does your tap water change during the monsoon?

It does, and usually not in the direction people expect. The common assumption is that rain dilutes hard water. The published data says the monsoon makes groundwater less predictable rather than reliably softer.

A 2025 study of 60 groundwater samples in the Valliyur region of southern Tamil Nadu measured total hardness from 59 to 1,424 mg/L before the monsoon and 67 to 5,260 mg/L after it. The share of samples above the standard dipped slightly, from 48% to 43%, while the range widened; the authors link this to slightly acidic rainwater flushing weathering products into the aquifer.

In a metro, the Central Ground Water Board's Hyderabad brochure recorded average groundwater hardness of 268 mg/L before the monsoon and 252 mg/L after it, a small drop. Supply changes too, differently in each city.

City	Where bathing water comes from	What the rains change
Bengaluru	Treated Cauvery water plus borewells and tankers; 24% of households were above 200 mg/L hardness in a 2018 survey, and groundwater runs 100 to 600 ppm	Buildings that relied on tankers in summer may switch back to piped supply, changing the mix; retest after the rains
Chennai	Reservoirs including Chembarambakkam, Red Hills, Poondi and Cholavaram, plus Veeranam tank and desalination plants	Main rains come with the northeast monsoon, October to December, so supply shifts later than in most of India
Delhi	Yamuna water treated at plants such as Wazirabad, plus groundwater (South West Delhi groundwater averaged 1,062 mg/L hardness in a 2016 to 2017 survey)	Silt and turbidity rise in the river; in September 2025 the Wazirabad plant ran at 20% reduced capacity, disrupting supply in parts of the city
Hyderabad	Krishna and Godavari river water plus borewells	In July 2022 Godavari raw water reached 85 to 90 NTU of turbidity against 5 to 6 NTU in the Krishna

Water is a contributing factor here, not the cause of monsoon shedding. It is simply the one you can measure, and our walkthrough on testing hard water at home covers each method and its cost.

Does the chlorine in your tap water change in the rains?

It can. Muddy, turbid river water uses up more chlorine, so treatment plants may need higher doses or longer contact times to disinfect it. What reaches your tap must still carry a little free chlorine within a range Indian standards set, so the level you shower in can move with the season.

The WHO notes that turbidity above 1 to 2 NTU reduces the efficacy of chlorination by increasing chlorine demand, and that heavy rain is one of the events that turns source water turbid.

Under BIS IS 10500:2012, chlorinated supply should carry at least 0.2 mg/L of free residual chlorine at the consumer end, with 1 mg/L listed as the permissible figure, and at least 0.5 mg/L where protection against viral infection is needed. The same standard sets 200 mg/L total hardness as acceptable and 600 mg/L as the permissible ceiling.

A point-of-use filter can reduce free chlorine and hardness at the shower; no shower filter addresses chloramine.

Should you oil your hair in the monsoon?

Yes, if you treat oil as a pre-wash step on the lengths. Cleveland Clinic suggests a small amount, left on for 20 minutes to an hour and then washed out. If you get dandruff, keep oil off the scalp, because it can raise the risk of a flare.

Overnight scalp oiling in sticky weather leaves oil, sweat and dust on the scalp until the next wash. Our guide on whether oiling protects hair from hard water covers which oils get into the hair and which just coat it.

How often should you wash your hair in the monsoon?

Often enough that sweat, rain and buildup do not sit on the scalp for days. That ranges from daily for an oily scalp to one to three times a week for many others. Washing does not cause hair loss; Cleveland Clinic explains that it dislodges hairs already in the shedding phase.

The AAD bases this on hair type: daily for straight hair with an oily scalp, when needed for dry, curly or thick hair. Getting caught in the rain is a reason to rinse and dry properly, not to skip a wash.

How do you tell monsoon shedding from real hair loss?

Watch the timeline and the scalp, not the drain. Seasonal shedding is diffuse, builds over a few weeks and eases as the season turns. Hair loss that needs a doctor keeps going, widens the parting or leaves patches. See a dermatologist if you notice:

• A daily average above 150 on your seven-day count, or clumps when you comb or brush
• A bald patch or strip that appears within a day or two
• A parting visibly wider than last year, or a thinner ponytail
• Intense itching, burning or tenderness, or scaly patches with sores that ooze pus
• Shedding that continues beyond six months
• Shedding together with other new symptoms

Blood work matters more than shampoo here. Low ferritin, thyroid problems and recent illness all cause shedding that no water treatment touches, and a doctor decides which tests you need.

Hard water shows up as roughness and breakage, not root loss, and the lab evidence is split. Srinivasan et al. 2013 (International Journal of Trichology) soaked hair from 15 women in 212.5 mg/L water or distilled water for 10 minutes on alternate days for 30 days and found no significant difference in tensile strength (P = 0.858) or elasticity (P = 0.874).

Luqman et al. 2018 (International Journal of Trichology) used hair from 70 men, 486.7 mg/L water against deionised and untreated hair, with the same routine for 3 months, and found the hard-water hair about 8% weaker (234.16 against 255.49, P = 0.001).

Which monsoon habits make hair fall worse?

Most monsoon mistakes keep the scalp damp or add oil and friction to it. These six are common in Indian homes from June to September, and each one costs nothing to change once you spot it. None of them is a reason to panic about the shedding itself.

• Overnight scalp oiling in humid weather. Keep oil on the lengths, as a pre-wash step.
• Tying wet hair under a helmet or dupatta. The scalp stays damp for hours.
• Skipping washes after getting caught in the rain. Rain and sweat need rinsing out.
• Hot showers on a flaking scalp. Hot water dries the scalp further.
• Rubbing hair dry. Wrap it in a towel or T-shirt instead.
• Treating every flake as dandruff. Hard-water residue and dry scalp need different fixes; use the table above.

What does a 12-week monsoon timeline look like?

Longer than four weeks. Shedding usually shows two to three months after its trigger, and the shedding phase itself lasts about three to six months, so a July trigger can still show in October. Changes to your wash routine show up sooner, in how hair feels and how much of it breaks.

When	What the hair cycle is doing	What to do
Weeks 0 to 2 (say, early July)	The season, a fever or stress pushes more hairs into the resting phase; nothing shows yet	Do a 7-day count as a baseline
Weeks 2 to 6	Nothing visible at the root yet; routine changes show in feel, with less tangling and fewer broken pieces	Fix washing, drying and oiling
Weeks 8 to 12 (September to October)	Resting hairs start to fall; shedding usually shows 2 to 3 months after a trigger	Recount and do the bulb check
Months 3 to 6	The shedding phase lasts about 3 to 6 months, then new hair grows	A daily average above 150 needs a doctor
Months 6 to 9	Fullness usually returns within six to nine months of the trigger passing, per the AAD	Shedding beyond six months needs a dermatologist

What helps during the monsoon?

Mostly routine rather than product: dry the scalp instead of tying hair back wet, wash often enough that buildup does not sit for days, and condition the lengths every wash. Beyond that, the water is worth addressing if your test comes back hard.

Where does a shower filter fit?

Care Dale makes a dermatologist-certified, clinically tested tap and shower filter for municipal supply at ₹1,499, with a version for borewell and tanker water at ₹1,899. It reduces hardness minerals, chlorine and physical particles such as sediment and rust, which matters most when the rains change what reaches your tap.

The Care Dale filter is not a purification system, so it does not reduce total dissolved solids (TDS), nor does it remove iron or heavy metals. No shower filter, Care Dale included, addresses iron, heavy metals, chloramine, TDS or bacteria, and none of them stops seasonal shedding, which is driven by the hair cycle rather than by your water.

Frequently asked questions

Is hair fall normal in the monsoon? Yes. Seasonal studies put the hair cycle's shedding peak in summer, and research tracking 823 women over six years found the highest share of resting hairs then. It is a normal cycle rather than damage and settles on its own; clumps or patches are the exception.

Why does hair fall increase in the rainy season? Three factors stack up. Humidity swells and dries the hair shaft repeatedly, which weakens the cuticle; a damp scalp flakes and itches more; and the seasonal hair cycle pushes more strands into the shedding phase at the same time. Water quality shifts as well.

Does washing hair every day in the monsoon cause hair fall? No. Shampooing dislodges hairs already in the shedding phase, so you see them in the drain, but it does not make more hair fall. Washing less often just means more hair comes out on wash day, so wash as often as sweat and an oily scalp need.

Does rainwater damage hair? Rainwater itself is soft and gentle on the hair shaft, but it collects dust and pollutants on the way down, and more again from rooftops and storage tanks. The bigger problem is leaving hair damp for hours afterwards rather than the water itself.

Can a shower filter stop monsoon hair fall? No. A filter reduces hardness minerals, chlorine and physical contaminants, which roughen hair at every wash. It does not lower TDS or remove iron, heavy metals or bacteria, because it is filtration rather than purification, and it does not change the seasonal hair cycle.

How long does monsoon hair fall last? Usually a few months. The shedding phase of the hair cycle lasts about 3 to 6 months, after which new hair grows and fullness returns over the following months. Shedding that goes on beyond six months, or comes with patches, points to something other than the season.