Watamu weather by month
Watamu runs from about 26°C in August to 29°C in February, with April the wettest month at 244 mm.
warmest month
February
29°C
coolest month
August
26°C
wettest month
April
244 mm
worst air month
January
12 µg/m³
The whole year, month by month.
| Month | Avg temp | Rain | Sun | PM2.5 |
|---|---|---|---|---|
| January | 29°C | 53 mm | 343 h | 12 |
| February | 29°C | 45 mm | 322 h | 12 |
| March | 29°C | 68 mm | 341 h | 7 |
| April | 27°C | 244 mm | 248 h | 4 |
| May | 28°C | 95 mm | 311 h | 7 |
| June | 27°C | 84 mm | 328 h | 8 |
| July | 26°C | 53 mm | 323 h | 8 |
| August | 26°C | 78 mm | 338 h | 8 |
| September | 26°C | 60 mm | 346 h | 7 |
| October | 27°C | 58 mm | 362 h | 7 |
| November | 27°C | 108 mm | 347 h | 8 |
| December | 28°C | 144 mm | 353 h | 9 |
About 3,962 hours of sun a year. Roughly 109 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 2026-05-27. Full method, licences and the list of sources we rejected are on the methodology page.