Climate averages 1991–2020
Arusha weather
in September.
A warm, very dry month: the 7th warmest and the 3rd driest of the year. Meets the pleasant-weather rule
Long-term climate patterns, not a forecast for a particular trip.
September is a warm month in Arusha: daytime highs average 25.0°C and nights cool to about 13.7°C. By daytime temperature it is the 7th warmest of the 12 months.
Expect about 4.1 mm of rain on roughly 1 day, which makes September a very dry 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 Kondoa (198 km away). In September its highs average 27.8°C, 2.8°C warmer than Arusha, with almost no rain (under 1 mm).
Among the 43 cities listed in Tanzania, Arusha ranks 38th of 43 for the warmest September highs and joint 14th of 43 for the driest September (rainfall, lowest first). The mean September high of those 43 cities is 28.0°C; Arusha is 3.0°C cooler than that mean.
From September to October, average highs rise by 1.2°C to 26.2°C, and monthly rainfall rises from 4.1 mm to 30 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
Arusha climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 27.7°C16.1°C | 16.1°C | 82 | 10.6 | 12.312 h |
| February | 28.4°C16.5°C | 16.5°C | 73 | 9.0 | 12.212 h |
| March | 27.2°C16.8°C | 16.8°C | 143 | 16.7 | 12.112 h |
| April | 24.3°C16.7°C | 16.7°C | 145 | 21.7 | 12.012 h |
| May | 22.6°C15.2°C | 15.2°C | 50 | 11.9 | 12.012 h |
| June | 21.7°C13.0°C | 13.0°C | 6.6 | 2.3 | 11.912 h |
| July | 21.5°C11.9°C | 11.9°C | 3.9 | 1.1 | 11.912 h |
| August | 22.8°C12.7°C | 12.7°C | 3.6 | 1.1 | 12.012 h |
| September, selected | 25.0°C13.7°C | 13.7°C | 4.1 | 1.1 | 12.112 h |
| October | 26.2°C15.2°C | 15.2°C | 30 | 7.3 | 12.212 h |
| November | 26.0°C16.2°C | 16.2°C | 103 | 17.7 | 12.312 h |
| December | 26.4°C16.1°C | 16.1°C | 108 | 16.7 | 12.312 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
- Kondoa in SeptemberTanzania · 198 kmHigh 27.8°C · Low 13.9°C · 0.8 mm rain
- Kitengela in SeptemberKenya · 212 kmHigh 24.5°C · Low 13.9°C · 11 mm rain
- Ongata Rongai in SeptemberKenya · 219 kmHigh 23.8°C · Low 13.2°C · 12 mm rain
- Mlolongo in SeptemberKenya · 221 kmHigh 24.3°C · Low 13.5°C · 11 mm rain
- Ngong in SeptemberKenya · 224 kmHigh 23.6°C · Low 12.5°C · 16 mm rain
- Nairobi in SeptemberKenya · 232 kmHigh 24.2°C · Low 13.2°C · 16 mm rain
- Kikuyu in SeptemberKenya · 236 kmHigh 21.9°C · Low 11.5°C · 16 mm rain
- Mwala in SeptemberKenya · 240 kmHigh 26.0°C · Low 15.2°C · 2.6 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 Arusha) is explained once on the Arusha year overview and on the Sources, method and limits page.