Tepoztlan weather by month
Tepoztlan runs from about 16°C in December to 26°C in May, with September the wettest month at 544 mm.
warmest month
May
26°C
coolest month
December
16°C
wettest month
September
544 mm
worst air month
December
25 µg/m³
The whole year, month by month.
| Month | Avg temp | Rain | Sun | PM2.5 |
|---|---|---|---|---|
| January | 18°C | 0 mm | 309 h | 23 |
| February | 20°C | 11 mm | 316 h | 24 |
| March | 23°C | 0 mm | 363 h | 23 |
| April | 24°C | 2 mm | 369 h | 23 |
| May | 26°C | 6 mm | 386 h | 24 |
| June | 22°C | 340 mm | 347 h | 13 |
| July | 19°C | 276 mm | 334 h | 16 |
| August | 19°C | 333 mm | 336 h | 15 |
| September | 19°C | 544 mm | 265 h | 14 |
| October | 18°C | 439 mm | 313 h | 17 |
| November | 17°C | 20 mm | 325 h | 22 |
| December | 16°C | 1 mm | 319 h | 25 |
About 3,982 hours of sun a year. Roughly 152 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.