Mazatlan weather by month
Mazatlan runs from about 20°C in February to 28°C in July, with August the wettest month at 287 mm.
warmest month
July
28°C
coolest month
February
20°C
wettest month
August
287 mm
worst air month
June
10 µg/m³
The whole year, month by month.
| Month | Avg temp | Rain | Sun | PM2.5 |
|---|---|---|---|---|
| January | 21°C | 0 mm | 303 h | 9 |
| February | 20°C | 37 mm | 275 h | 10 |
| March | 21°C | 1 mm | 329 h | 9 |
| April | 22°C | 0 mm | 351 h | 9 |
| May | 25°C | 0 mm | 367 h | 10 |
| June | 27°C | 71 mm | 330 h | 10 |
| July | 28°C | 90 mm | 338 h | 10 |
| August | 28°C | 287 mm | 293 h | 9 |
| September | 28°C | 181 mm | 314 h | 7 |
| October | 28°C | 38 mm | 334 h | 8 |
| November | 24°C | 7 mm | 307 h | 8 |
| December | 21°C | 3 mm | 289 h | 10 |
About 3,830 hours of sun a year. Roughly 72 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.