Cozumel weather by month
Cozumel runs from about 24°C in February to 30°C in May, with June the wettest month at 462 mm.
warmest month
May
30°C
coolest month
February
24°C
wettest month
June
462 mm
worst air month
June
15 µg/m³
The whole year, month by month.
| Month | Avg temp | Rain | Sun | PM2.5 |
|---|---|---|---|---|
| January | 25°C | 52 mm | 306 h | 6 |
| February | 24°C | 33 mm | 308 h | 8 |
| March | 27°C | 34 mm | 365 h | 8 |
| April | 27°C | 26 mm | 358 h | 7 |
| May | 30°C | 7 mm | 389 h | 12 |
| June | 28°C | 462 mm | 268 h | 15 |
| July | 29°C | 159 mm | 342 h | 10 |
| August | 29°C | 126 mm | 345 h | 7 |
| September | 28°C | 240 mm | 305 h | 5 |
| October | 27°C | 229 mm | 270 h | 5 |
| November | 26°C | 95 mm | 317 h | 6 |
| December | 25°C | 100 mm | 292 h | 6 |
About 3,865 hours of sun a year. Roughly 141 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 2026-05-25. Full method, licences and the list of sources we rejected are on the methodology page.