Oaxaca weather by month
Oaxaca runs from about 17°C in December to 26°C in May, with September the wettest month at 222 mm.
warmest month
May
26°C
coolest month
December
17°C
wettest month
September
222 mm
worst air month
May
14 µg/m³
The whole year, month by month.
| Month | Avg temp | Rain | Sun | PM2.5 |
|---|---|---|---|---|
| January | 19°C | 0 mm | 338 h | 7 |
| February | 20°C | 8 mm | 318 h | 8 |
| March | 23°C | 2 mm | 359 h | 10 |
| April | 24°C | 21 mm | 368 h | 12 |
| May | 26°C | 8 mm | 388 h | 14 |
| June | 22°C | 198 mm | 299 h | 7 |
| July | 19°C | 198 mm | 347 h | 9 |
| August | 19°C | 202 mm | 346 h | 10 |
| September | 19°C | 222 mm | 260 h | 9 |
| October | 18°C | 170 mm | 305 h | 7 |
| November | 18°C | 13 mm | 328 h | 8 |
| December | 17°C | 7 mm | 321 h | 9 |
About 3,977 hours of sun a year. Roughly 105 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.