Nairobi weather by month
Nairobi runs from about 18°C in July to 21°C in March, with April the wettest month at 178 mm.
warmest month
March
21°C
coolest month
July
18°C
wettest month
April
178 mm
worst air month
July
26 µg/m³
The whole year, month by month.
| Month | Avg temp | Rain | Sun | PM2.5 |
|---|---|---|---|---|
| January | 20°C | 83 mm | 329 h | 10 |
| February | 21°C | 28 mm | 335 h | 13 |
| March | 21°C | 36 mm | 346 h | 13 |
| April | 20°C | 178 mm | 297 h | 10 |
| May | 19°C | 80 mm | 315 h | 14 |
| June | 18°C | 26 mm | 315 h | 16 |
| July | 18°C | 52 mm | 285 h | 26 |
| August | 18°C | 16 mm | 271 h | 21 |
| September | 19°C | 22 mm | 319 h | 15 |
| October | 20°C | 35 mm | 344 h | 13 |
| November | 19°C | 129 mm | 298 h | 10 |
| December | 20°C | 71 mm | 336 h | 11 |
About 3,790 hours of sun a year. Roughly 77 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 2026-05-23. Full method, licences and the list of sources we rejected are on the methodology page.