Sri Lanka
Sri Lanka in September: weather, sea & travel advice
This month's data profile
Rain shapes the decision
Sri Lanka in September is climatically well suited to beach holidays. The average daily high is around 28 °C, and the sea is about 28 °C. With about 23 rainy days it is very wet.
Historical monthly averages, not a weather forecast. Individual days and years can differ substantially.
Rank among 12 monthly averages
60/100 · #5
Warmth
#9
Dryness
#7
Sun
#4
Sea warmth
#9
Published best categories: none
Sri Lanka · SeptemberPhoto: Luboš Holič · CC BY-SA 3.0Climate facts
- Average high
- 28 °C
- Average low
- 25 °C
- Sea
- 28 °C
- Rainy days (est.)
- 23 rainy days (est.)
- Sun (est.)
- 6 h/day
- Humidity
- 85 %
Climate evidence with direct month comparison
The highlighted row is the selected month. Precipitation total and rainy days are separate monthly averages.
| Month | Avg high °C | Avg low °C | Rainy days (est.) | Precipitation mm | Sun h/day (est.) | Humidity % | Wind m/s | Sea °C | Score |
|---|---|---|---|---|---|---|---|---|---|
| August | 28 | 25 | 21 | 122 | 6.2 | 86 | 4.5 | 28 | 62 |
| September (selected) | 28 | 25 | 23 | 169 | 6.2 | 85 | 4.3 | 28 | 60 |
| October | 28 | 25 | 27 | 282 | 5.9 | 85 | 3.5 | 28 | 58 |
How do the previous and next months compare?
Baseline: September (60/100)
Positive and negative values show the change from the selected month.
| Score Δ | Average high Δ | Average low Δ | Rainy days Δ | Rain Δ | Sun Δ | Humidity Δ | Wind Δ | Sea Δ | |
|---|---|---|---|---|---|---|---|---|---|
| August | +2 | -0.2 °C | -0.1 °C | -2.3 | -47.5 mm | ±0 h | +0.8 % | +0.2 m/s | -0.3 °C |
| October | -2 | -0.1 °C | -0.2 °C | +3.8 | +112.5 mm | -0.3 h | +0.2 % | -0.8 m/s | +0.3 °C |
All twelve months in context
Find a place to stay
Where to stay in Sri Lanka
Compare available stays, prices and cancellation terms for Sri Lanka on Booking.com.
Booking.comFind places to stayAffiliate link: there is no extra cost to you.
Useful next decisions
Frequently asked questions
How warm is Sri Lanka in September?
The average daily high is around 28 °C, with an average daily low of about 25 °C.
Can you swim in Sri Lanka in September?
The sea is about 28 °C (very warm).
Does it rain a lot in Sri Lanka in September?
The curated estimate is about 23 rainy days per month, not a directly measured long-term average. Total precipitation averages around 169 mm for the month. A rainy day does not mean all-day rain.
When is the best time to visit Sri Lanka?
By the climate score, January, February, July and August are the strongest months for Sri Lanka. For a beach trip: January, February, July and August. September is not among them.