Tehran weather by month
Tehran runs from about 5°C in December to 33°C in August, with February the wettest month at 57 mm.
warmest month
August
33°C
coolest month
December
5°C
wettest month
February
57 mm
worst air month
November
67 µg/m³
The whole year, month by month.
| Month | Avg temp | Rain | Sun | PM2.5 |
|---|---|---|---|---|
| January | 7°C | 52 mm | 248 h | 52 |
| February | 6°C | 57 mm | 231 h | 48 |
| March | 10°C | 57 mm | 300 h | 43 |
| April | 18°C | 18 mm | 336 h | 34 |
| May | 22°C | 38 mm | 358 h | 32 |
| June | 30°C | 1 mm | 375 h | 27 |
| July | 33°C | 0 mm | 395 h | 29 |
| August | 33°C | 0 mm | 391 h | 27 |
| September | 26°C | 18 mm | 324 h | 37 |
| October | 19°C | 7 mm | 328 h | 47 |
| November | 12°C | 36 mm | 262 h | 67 |
| December | 5°C | 9 mm | 245 h | 59 |
About 3,793 hours of sun a year. Roughly 31 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.