Climate averages 1991–2020
Mombasa weather
in September.
A warm, moderately wet month: the 9th warmest and the 3rd driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a warm month in Mombasa: daytime highs average 27.7°C and nights cool to about 22.6°C. By daytime temperature it is the 9th warmest of the 12 months.
Expect about 43 mm of rain on roughly 15 days, which makes September a moderately wet month (the 3rd driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 05 min on an average September day.
The nearest other city in this atlas is Jomvu (10 km away). In September its highs average 28.4°C, 0.7°C warmer than Mombasa, with 38 mm of rain.
Among the 37 cities listed in Kenya, Mombasa ranks 11th of 37 for the warmest September highs and joint 23rd of 37 for the driest September (rainfall, lowest first). The mean September high of those 37 cities is 25.7°C; Mombasa is 1.9°C warmer than that mean.
From September to October, average highs rise by 1.0°C to 28.6°C, and monthly rainfall rises from 43 mm to 75 mm.
The annual picture
September in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Mombasa climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 31.1°C24.7°C | 24.7°C | 18 | 3.5 | 12.312 h |
| February | 31.8°C24.7°C | 24.7°C | 11 | 2.4 | 12.212 h |
| March | 31.6°C25.0°C | 25.0°C | 49 | 12.4 | 12.112 h |
| April | 29.6°C24.7°C | 24.7°C | 136 | 24.4 | 12.012 h |
| May | 27.8°C23.9°C | 23.9°C | 223 | 24.1 | 11.912 h |
| June | 26.9°C23.2°C | 23.2°C | 92 | 20.5 | 11.912 h |
| July | 26.3°C22.4°C | 22.4°C | 69 | 19.8 | 11.912 h |
| August | 26.7°C22.2°C | 22.2°C | 49 | 17.2 | 12.012 h |
| September, selected | 27.7°C22.6°C | 22.6°C | 43 | 14.8 | 12.112 h |
| October | 28.6°C23.2°C | 23.2°C | 75 | 14.9 | 12.212 h |
| November | 29.5°C23.7°C | 23.7°C | 66 | 16.1 | 12.312 h |
| December | 30.5°C24.4°C | 24.4°C | 46 | 13.0 | 12.412 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
September in nearby cities
- Jomvu in SeptemberKenya · 10 kmHigh 28.4°C · Low 22.2°C · 38 mm rain
- Mtwapa in SeptemberKenya · 16 kmHigh 28.4°C · Low 22.6°C · 43 mm rain
- Matuga in SeptemberKenya · 16 kmHigh 26.5°C · Low 22.0°C · 52 mm rain
- Ukunda in SeptemberKenya · 29 kmHigh 27.1°C · Low 22.6°C · 52 mm rain
- Kilifi in SeptemberKenya · 52 kmHigh 27.8°C · Low 23.0°C · 33 mm rain
- Malindi in SeptemberKenya · 106 kmHigh 27.1°C · Low 23.5°C · 30 mm rain
- Tanga in SeptemberTanzania · 129 kmHigh 28.5°C · Low 21.6°C · 40 mm rain
- Handeni in SeptemberTanzania · 238 kmHigh 26.1°C · Low 17.9°C · 38 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Mombasa) is explained once on the Mombasa year overview and on the Sources, method and limits page.
Mtwapa lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.