Bentota weather in September

September in Bentota: sweltering, soaked, with clean air — fine if you can take 28 rainy days.

Updated September 2026 · climate normals from ERA5 reanalysis

Bentota🇱🇰 Sri Lanka · Sri Lanka & the Maldives · Beach70
  1. 81Jan
  2. 87Feb
  3. 83Mar
  4. 77Apr
  5. 61May
  6. 72Jun
  7. 76Jul
  8. 74Aug
  9. 70Sep
  10. 63Oct
  11. 59Nov
  12. 75Dec

#9 of 12 months in Bentota · #948 of 1413 destinations to visit in September · comfort 70/100 (tier B)

Days
28°C
Nights
25°C
Wet days
28
Sun
9.2 h
Humidity
85%
Daylight
12 h
Bentota, Sri Lanka
Photo: Mohan Nannapaneni · Pexels

Traveller notes on Bentota in September

Notes from nearby Nuwara Eliya (106 km away)

Bentota doesn't have its own notes for September yet — these are about Nuwara Eliya, close enough to share the season.

Nuwara Eliya-forum threads on September weather describe this hill town as genuinely cool given its elevation, a real contrast to the lowland heat elsewhere, and posters are consistent this stretch of the year runs wetter, drizzly stints entirely possible across a multi-day stay. One visitor touring in the late-August-into-September window reported a couple of hours of light drizzle rather than a full washout, suggesting shorter showers rather than sustained downpours. Regulars call mid-September a reasonable sweet spot within the broader wet season, conditions gradually starting to balance out compared to the peak of the pattern. A proper jacket is standing advice regardless of forecast, evenings running genuinely chilly year round given the elevation. Posters call the tea country scenery and cooler climate worth the rain risk. The record: 19.5C days feeling like 19C, 13.4C nights, an extraordinarily high 166mm across 26 days and 84 percent humidity.
NuwaraEliyaSeptemberRegular · September · 1 month ago · about Nuwara Eliya · Read more on Tripadvisor ↗

Other months in Bentota

Bentota forum threads describe August as bright and sunny most mornings, with cloud building through the afternoon and a real chance of showers by evening - not an all-day washout, but genuinely wet stretches happen too, and this coast sees frequent rain days through the month. The monsoon's bigger effect here is on the sea rather than the sky: ocean swimming turns unreliable due to rough surf and strong currents, though Bentota's sheltered lagoon and river keep watersports viable even on rough-ocean days. Forum consensus was that this window is still workable for a trip, just with beach plans built around the lagoon rather than open water.
GalleCoastRegular · August · 1 month ago · Read more on Tripadvisor ↗
Forum posters place February squarely within Sri Lanka's preferred southwest-coast season (mid-December to mid-April, plus July to mid-September), and call it typically a drier month overall. That said, posters are candid the weather can still flip within a single day - sunny for hours, then an hour or two of genuine downpour - so a light rain jacket is standard advice even during the 'dry' stretch. Wind is described as generally mild in February, with just a light, steady sea breeze rather than the stronger gusts some other months bring, making conditions comfortable for beach time along this stretch of coast.
Tripadvisor community · February · 1 month ago · Read more on Tripadvisor ↗

Add your own note from Bentota's card on the map.

Bentota climate normals — September

Daytime high28°C / 83°F🔥 sweltering
Nighttime low25°C / 77°F
Feels like (high)34°C / 93°F
Sea temperature28°C / 83°F♨️ bath-warm
Rainfall252 mm / 9.9 in⛈ soaked
Rainy days28 days
Humidity85%💦 very humid
Dew point24°C / 75°F
Sunshine9.2 h/day
Daylight12.2 h
Wind15 km/h / 10 mph
Air quality (US AQI)49🍃 good

Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.

Crowds in Bentota in September

How busy the place itself is — school and mass holidays, the months an editor tagged, and how sought-after the weather makes them. Never part of the comfort score.

BusyAugust break in Sri Lanka, school holidays in 3 of the markets that fill it(estimated)

JFMAMJJASOND

Peak crowdsBusyShoulder seasonQuiet

Best months for Bentota's weather

Ranked by this destination's own climate comfort score across the year — a different thing from how busy it gets (see Crowds above).

Fair weatherBentota's weather peaks January–March, best around February.

JFMAMJJASOND

Best weatherFair weatherToughest weather

What's on in Bentota in September

Recurring seasonal events, natural spectacles, closures and holidays — curated and sourced.

  • Rule

    Poya days

    1 Jan – 31 DecClosures

    Every full moon is a civil holiday and the sale of alcohol is prohibited islandwide, hotel bars included. There are thirteen or fourteen a year, so one will land on most trips. Source ↗

  • Season

    Off-season on the strip

    15 May – 15 Sep · usuallyOff-season shutdownClosures

    The sea gets rough and brown, the jet-ski and banana-boat outfits mostly stop, and a good share of the beach restaurants close for repairs. Rooms are half price and the river trips still run.

  • Season

    Wet season

    MonsoonRisk

    28 rainy days and about 252 mm in the month — the real kind of rainy season, not afternoon showers.

    from the climate normals

What's on around the world in September →

Nearby, and something's on

Within 300 km of Bentota — a day trip or a short hop — with something on this month. Never part of the comfort score.

Where is Bentota?

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Bentota in September — FAQ

Is September a good time to visit Bentota?
September in Bentota: sweltering, soaked, with clean air — fine if you can take 28 rainy days. It ranks #9 of 12 months for Bentota on SeasonMap's comfort score (70/100).
What is the weather like in Bentota in September?
In September, Bentota averages a daily high of 28.4°C and a low of 24.9°C, with about 252.3 mm of rain over roughly 28 rainy days.
What is the air quality in Bentota in September?
Bentota has a mean US Air Quality Index of about 49 in September.

Within 300 km: Sigiriya's The Gathering at Minneriya around 15 Jul – 30 Sep, and Trincomalee's Blue and sperm whale season around 1 May – 15 Oct.