Big Sur weather by month
Big Sur runs from about 12°C in February to 20°C in October, with February the wettest month at 361 mm.
warmest month
October
20°C
coolest month
February
12°C
wettest month
February
361 mm
worst air month
March
11 µg/m³
The whole year, month by month.
| Month | Avg temp | Rain | Sun | PM2.5 |
|---|---|---|---|---|
| January | 13°C | 183 mm | 199 h | 7 |
| February | 12°C | 361 mm | 221 h | 8 |
| March | 12°C | 180 mm | 281 h | 11 |
| April | 13°C | 110 mm | 333 h | 9 |
| May | 14°C | 22 mm | 394 h | 9 |
| June | 17°C | 1 mm | 397 h | 9 |
| July | 20°C | 0 mm | 424 h | 7 |
| August | 19°C | 0 mm | 393 h | 8 |
| September | 19°C | 6 mm | 347 h | 9 |
| October | 20°C | 4 mm | 323 h | 9 |
| November | 14°C | 85 mm | 244 h | 9 |
| December | 14°C | 98 mm | 234 h | 9 |
About 3,790 hours of sun a year. Roughly 99 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.