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Arusha weather by month
Historical averages 2016–2025 · not a forecast
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When is the best time to visit Arusha?
For a warm holiday, the best week has been 20–26 September (Weather Index 98). Favourable start dates for a 7-day trip run from 10 September to 15 October. February is warmest (28°C), September is driest and September to March have the most sun.
- Warmest
- February 28°C
- Coolest
- June and July 22°C
- Driest
- September 3% rain-day chance
- Wettest
- April 78% rain-day chance
- Sunniest
- September to March 11 hours a day
A rain day has 1 mm or more, snow included, so a short shower counts. Monthly averages below give the amounts.
Monthly averages in Arusha
Arusha historical monthly estimates, 2016–2025. Temperatures and sunshine are daily averages.
| Month | High (°C) | Low (°C) | Rain-day chance (%) | Expected rain days | Precipitation (mm/month) | Sunshine (hours/day) |
|---|---|---|---|---|---|---|
| January | 26.7 | 15.8 | 38.7 | 12.0 | 101.3 | 10.8 |
| February | 27.8 | 15.7 | 28.9 | 8.1 | 66.9 | 11.3 |
| March | 27.5 | 16.7 | 48.1 | 14.9 | 144.6 | 10.5 |
| April | 25.1 | 17.3 | 77.7 | 23.3 | 156.0 | 9.5 |
| May | 23.4 | 15.4 | 32.3 | 10.0 | 37.8 | 9.8 |
| June | 22.3 | 13.1 | 7.7 | 2.3 | 7.9 | 10.2 |
| July | 22.1 | 12.3 | 4.5 | 1.4 | 5.4 | 10.4 |
| August | 23.3 | 12.9 | 5.5 | 1.7 | 5.2 | 10.4 |
| September | 25.1 | 13.6 | 2.7 | 0.8 | 3.6 | 10.8 |
| October | 26.2 | 15.4 | 27.7 | 8.6 | 38.3 | 11.0 |
| November | 25.9 | 16.4 | 56.7 | 17.0 | 109.2 | 10.9 |
| December | 25.9 | 15.9 | 54.5 | 16.9 | 99.9 | 11.0 |
Each month averages its own days. Precipitation includes snow. About the data
Sources
Open-Meteo · 1 Jan 2016 – 31 Dec 2025
- Open-Meteo Historical Weather API
- Local days, 2016–2025, every year weighted equally. Each weekly chart averages its own seven days, without smoothing.
- Shading shows the 10th–90th percentile of past days, not forecast confidence.
- A rain day has at least 1 mm, snow included. The last weekly period has eight days.
- Wind is the average daytime (10:00–18:00) maximum, not gusts. Daylight is calculated from latitude. Missing readings stay blank.
- Mugginess (dew point) comes from the original daily summaries, on UTC days.
- The live two-week forecast comes from the Open-Meteo Weather Forecast API. The Weather Index does not use it.