Khao Sok (Khao Sok National Park) weather in September

September in Khao Sok: sweltering, soaked, with clean air — a gamble, with 27 rainy days.

Updated September 2026 · climate normals from ERA5 reanalysis

Khao Sok🇹🇭 Thailand · Andaman Coast · National park50
  1. 69Jan
  2. 64Feb
  3. 53Mar
  4. 51Apr
  5. 48May
  6. 58Jun
  7. 54Jul
  8. 55Aug
  9. 50Sep
  10. 49Oct
  11. 57Nov
  12. 69Dec

#10 of 12 months in Khao Sok · #1264 of 1413 destinations to visit in September · comfort 50/100 (tier D)

Days
29°C
Nights
24°C
Wet days
27
Sun
6.8 h
Humidity
91%
Daylight
12 h
Khao Sok, Thailand
Photo: phiraphon srithakae · Pexels

Traveller notes on Khao Sok in September

Khao Sok-forum threads asking whether the wetter season is worth it come back strongly positive, posters calling the jungle genuinely at its most vivid this time of year, waterfalls running at full force and the park noticeably quieter than peak season. Regulars describe a typical day as sunny mornings giving way to a real afternoon or evening downpour, though experience varies wildly, one visitor reporting only half an hour of rain a day while another the following week hit a much wetter stretch. September is named among the wettest months here, real planning flexibility standing advice given how unpredictable week-to-week conditions run. Posters call the lake mist and jungle atmosphere genuinely dramatic, a real payoff for travelers willing to accept the risk. Regulars recommend a floating bungalow stay as a highlight regardless of conditions. The record: 28.8C days feeling like a punishing 34C, 23.9C nights, an extraordinarily high 347mm across over 27 days and 91 percent humidity.
KhaoSokSeptemberRegular · September · 1 month ago · Read more on Tripadvisor ↗

Other months in Khao Sok

Khao Sok-forum threads on a March visit describe temperatures as genuinely climbing toward thirty-five degrees by late March into early April, posters naming rising humidity alongside the heat as standard this time of year. Regulars call Sok River levels genuinely dropping, several posters naming narrowing river-activity options as a real consequence of the drier season. Posters call unexpected rain still genuinely possible despite officially being dry season, one poster recalling cancellations twice in a single March trip due to sudden downpours. Regulars call March through May a real strong window for wildlife viewing, several threads naming the shores of Cheow Lan Lake specifically as where sightings concentrate. Posters recommend real flexible plans around river activities for a March trip, several regulars calling this standard given how much water levels and weather can shift. The record: 34C days, 23.7C nights, 72.4mm across 11 days and 74 percent humidity.
KhaoSokMarchRegular · March · 1 month ago · Read more on Tripadvisor ↗
Khao Sok-forum threads on an August visit describe this as genuinely the middle of wet season, posters calling the rainforest park prone to real closures on trails the park authority deems unsuitable after heavy showers. Regulars call afternoon or evening the typical timing for showers, short but intense bursts cited repeatedly rather than an all-day washout. Posters call trekking trails genuinely prone to closure this month, leeches a real factor on whatever sections stay open. Regulars call longtail boat trips still running though capable of being cancelled or cut short depending on conditions that day. Posters recommend real waterproof gear and flexible plans regardless of exact August dates, one regular noting the lake's water level and clarity were genuinely excellent for rafting despite the season. The record: 29.2C days feeling like 34C, 24.3C nights, an extraordinarily high 273.3mm across over 26 days and 87 percent humidity.
KhaoSokAugustRegular · August · 1 month ago · Read more on Tripadvisor ↗
Khao Sok-forum threads on storm icons are direct: a dramatic-looking forecast symbol doesn't necessarily mean real rain, posters calling the actual chance of a wash-out day here usually low despite how ominous a weather app can look. Regulars call February squarely outside the region's double monsoon window, both coastal systems that affect Khao Sok generally quiet this time of year. Posters describe daytime readings as climbing into the low thirties by late February, genuinely warm for jungle activity and lake excursions. Regulars call air quality here reliably good regardless of season, the park's remote setting away from agricultural burning a real advantage. Posters recommend real sun protection and hydration for any full-day boat trip on Cheow Lan Lake. Regulars call a passing shower here typically short and heavy rather than a sustained soak. The record: 32.6C days feeling like a punishing 37C, 22.6C nights, 39.7mm across nearly 8 days and 74 percent humidity.
KhaoSokFebruaryRegular · February · 1 month ago · Read more on Tripadvisor ↗
Khao Sok-forum threads on April conditions describe this as the tail end of the pre-monsoon stretch, posters calling heat and humidity genuinely intense before the heaviest rains return. Regulars describe afternoon thunderstorms as increasingly common through the month, brief but sometimes heavy downpours a real possibility. Posters recommend real hydration and sun protection, the combination of heat and thick jungle humidity making exertion feel considerably harder than the raw temperature suggests. Regulars call an early start essential for the lake tour and jungle trekking both, cooler morning hours far more comfortable than a midday push. Posters describe the limestone karst scenery on Cheow Lan Lake as worth the trip regardless of heat. Regulars recommend flexible plans given how quickly an afternoon system can build. The record: 32.7C days feeling like a punishing 39C, 24.6C nights, an extraordinarily high 176.9mm across over 21 days and 82 percent humidity.
KhaoSokAprilRegular · April · 1 month ago · Read more on Tripadvisor ↗

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

Khao Sok climate normals — September

Daytime high29°C / 84°F🔥 sweltering
Nighttime low24°C / 75°F
Feels like (high)35°C / 95°F
Sea temperature30°C / 86°F♨️ bath-warm
Rainfall349 mm / 13.7 in⛈ soaked
Rainy days27 days
Humidity91%💦 very humid
Dew point24°C / 76°F
Sunshine6.8 h/day
Daylight12.2 h
Wind12 km/h / 8 mph
Air quality (US AQI)24🍃 good

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

Crowds in Khao Sok 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.

Peak crowdstravelers describe it as peak season, school holidays in 3 of the markets that fill it

Sourced from traveler notes: “…running at full force and the park noticeably quieter than peak season. Regulars describe a typical day as sunny mornings giving w…” — KhaoSokSeptemberRegular

JFMAMJJASOND

Peak crowdsBusyShoulder seasonQuiet

Best months for Khao Sok'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).

Toughest weatherKhao Sok's weather peaks December–February, best around January.

JFMAMJJASOND

Best weatherFair weatherToughest weather

What's on in Khao Sok in September

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

  • Season

    Southwest monsoon

    1 May – 30 Sep · usually

    This is one of the wettest patches of forest in the country and it shows: afternoon storms, cloud on the limestone all morning, and trails that turn to clay. The lake looks its best in it.

  • Season

    Wet season

    MonsoonRisk

    27 rainy days and about 349 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 Khao Sok — a day trip or a short hop — with something on this month. Never part of the comfort score.

Where is Khao Sok?

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Khao Sok in September — FAQ

Is September a good time to visit Khao Sok?
September in Khao Sok: sweltering, soaked, with clean air — a gamble, with 27 rainy days. It ranks #10 of 12 months for Khao Sok on SeasonMap's comfort score (50/100).
What is the weather like in Khao Sok in September?
In September, Khao Sok averages a daily high of 28.8°C and a low of 23.9°C, with about 348.5 mm of rain over roughly 27.2 rainy days.
What is the air quality in Khao Sok in September?
Khao Sok has a mean US Air Quality Index of about 24 in September.

Within 300 km: Ko Tao's Clear water, dive season around 1 Feb – 30 Sep, and Ko Pha Ngan's Full Moon Party on 1 Jan – 31 Dec.