Temperature
Warm by day, warm at night.
81°Ftypical September high
Typical range
September climate
September in Koh Tao
Thailand · Southeast Asia
Warm days and some sun. Typhoon risk near peak and humid air are the main drawbacks.
Some tradeoffs
Daytime high
81°F
Lows around 78°F
Rain
Rain most days
Sun
9 h/day
Air feel
Humid
Sea temp
85°F
Great for swimming
When to visit
Month-by-month fit
Best
Precipitation
It rains on most days, with a mix of brief and longer spells. About 22 wet days, more than in most months.
73%wet-day frequency
AmountWet-day chance
Sunshine
Cloudier spells limit sunshine.
8.9 hSeptember sunshine
Heat & humidity by month
Warm days, with humid periods.
100%September Heat feel
Easy airWarm airHumid airVery humid air
Hourly temperature pattern
In September, afternoons feel about 82° and nights feel near 79°.
WarmHotNight hours
Clear sky
Overcast skies this month.
9%September Clear sky
Clear skyCloud
Wind pattern
September's typical breeze keeps the air from feeling as stagnant.
12 mphSeptember Breezy
Sea temperature
85°FSeptember sea temp
More detailIncludes daypart comfort
Typical September day
September stays around 79°F through the day and night.
Avg temp Typical range
Morning78°F
Feels 81°F
Rain41%
Cloud88%
Humid airVery high
Sun intensityModerate
Midday79°F
Feels 82°F
Rain35%
Cloud85%
Humid airVery high
Sun intensityStrong
Late afternoon79°F
Feels 82°F
Rain37%
Cloud81%
Humid airVery high
Sun intensityModerate
Early evening79°F
Feels 81°F
Rain39%
Cloud87%
Humid airVery high
Sun intensityMinimal
Best windowData tableView month-by-month numbers
View month-by-month numbers
| Month | High°F | Low°F | Rainin | Wet days | Sunh | Humidity% | Sea°F |
|---|---|---|---|---|---|---|---|
| Jan | 78 | 76 | 1.0 | 5 | 10.5 | 77 | 83 |
| Feb | 79 | 77 | 2.6 | 10 | 10.8 | 77 | 83 |
| Mar | 80 | 78 | 1.5 | 9 | 10.8 | 78 | 85 |
| Apr | 82 | 79 | 4.0 | 13 | 11.1 | 78 | 86 |
| May | 83 | 80 | 7.7 | 20 | 10.5 | 80 | 87 |
| Jun | 82 | 79 | 3.6 | 19 | 9.7 | 79 | 86 |
| Jul | 82 | 78 | 5.8 | 21 | 9.4 | 80 | 85 |
| Aug | 82 | 78 | 5.1 | 20 | 9.5 | 80 | 85 |
| Sep | 81 | 78 | 7.2 | 22 | 8.9 | 81 | 85 |
| Oct | 80 | 77 | 10.9 | 28 | 8.9 | 82 | 85 |
| Nov | 80 | 77 | 12.7 | 23 | 9.3 | 80 | 84 |
| Dec | 79 | 77 | 6.3 | 12 | 9.9 | 77 | 83 |
Similar climates
Similar
Similar travel styleGili IslandsIndonesiaSimilar travel styleKo Phi PhiThailandSimilar travel styleMaafushiMaldivesSimilar travel styleBaliIndonesia
Want a side-by-side climate view? Compare Koh Tao with Gili Islands.
Climate data notePlanning guidance, not a forecast
Typical monthly values are based on long-term climate records. Useful for planning, not a forecast. Check the weather before you travel.
Sunshine: source type is not yet identified at metric level.
Local microclimates can vary by beach, neighborhood, trail, or elevation.
Last updated: Aug 22, 2026
Data & methodology