Arusha weather by month
Arusha runs from about 18°C in June to 22°C in February, with December the wettest month at 318 mm.
warmest month
February
22°C
coolest month
June
18°C
wettest month
December
318 mm
worst air month
July
14 µg/m³
The whole year, month by month.
| Month | Avg temp | Rain | Sun | PM2.5 |
|---|---|---|---|---|
| January | 21°C | 208 mm | 317 h | 10 |
| February | 22°C | 82 mm | 325 h | 12 |
| March | 22°C | 260 mm | 343 h | 8 |
| April | 20°C | 185 mm | 290 h | 6 |
| May | 20°C | 41 mm | 305 h | 9 |
| June | 18°C | 38 mm | 309 h | 11 |
| July | 18°C | 14 mm | 304 h | 14 |
| August | 19°C | 33 mm | 310 h | 13 |
| September | 20°C | 23 mm | 315 h | 10 |
| October | 21°C | 57 mm | 334 h | 11 |
| November | 22°C | 86 mm | 332 h | 8 |
| December | 20°C | 318 mm | 319 h | 10 |
About 3,803 hours of sun a year. Roughly 133 rainy days a year.
These are long-run climate normals, not a forecast. A given year can sit well outside them. PM2.5 is a global model: near the coast it counts sea salt as fine particulate and reads high against ground stations, sometimes by a factor of two. Use the shape of the year, not the absolute number.
where these numbers come from
- · Temperature, rainfall and sunshine: ECMWF ERA5 reanalysis climate normals via Open-Meteo (CC BY 4.0), fetched once and stored.
- · PM2.5: Copernicus CAMS reanalysis, monthly means. Modelled, not station readings; near coasts CAMS counts sea salt as PM2.5 and reads high.
Last reviewed 2026-05-24. Full method, licences and the list of sources we rejected are on the methodology page.