Diani Beach weather in September
September in Diani Beach: hot, a little rain, with clean air — an excellent time to visit.
#3 of 12 months in Diani Beach · #129 of 604 destinations to visit in September · comfort 87/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Diani Beach climate normals — September
| Daytime high | 28°C / 82°F | 🥵 hot |
|---|---|---|
| Nighttime low | 23°C / 73°F | |
| Feels like (high) | 31°C / 88°F | |
| Rainfall | 64 mm / 2.5 in | 🌦 some rain |
| Rainy days | 20 days | |
| Humidity | 78% | 💦 very humid |
| Dew point | 21°C / 69°F | |
| Sunshine | 11 h/day | |
| Daylight | 12.1 h | |
| Wind | 19 km/h / 12 mph | |
| Air quality (US AQI) | 36 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Where is Diani Beach?
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Diani Beach in September — FAQ
- Is September a good time to visit Diani Beach?
- September in Diani Beach: hot, a little rain, with clean air — an excellent time to visit. It ranks #3 of 12 months for Diani Beach on SeasonMap's comfort score (87/100).
- What is the weather like in Diani Beach in September?
- In September, Diani Beach averages a daily high of 27.6°C and a low of 23°C, with about 63.8 mm of rain over roughly 20 rainy days.
- What is the air quality in Diani Beach in September?
- Diani Beach has a mean US Air Quality Index of about 36 in September.