Santa Cruz weather by month
Santa Cruz runs from about 19°C in July to 27°C in January, with December the wettest month at 232 mm.
warmest month
January
27°C
coolest month
July
19°C
wettest month
December
232 mm
worst air month
September
15 µg/m³
The whole year, month by month.
| Month | Avg temp | Rain | Sun | PM2.5 |
|---|---|---|---|---|
| January | 27°C | 96 mm | 344 h | 7 |
| February | 26°C | 130 mm | 298 h | 7 |
| March | 27°C | 90 mm | 311 h | 7 |
| April | 25°C | 171 mm | 240 h | 7 |
| May | 20°C | 86 mm | 183 h | 8 |
| June | 22°C | 40 mm | 239 h | 9 |
| July | 19°C | 43 mm | 243 h | 9 |
| August | 22°C | 97 mm | 285 h | 9 |
| September | 26°C | 55 mm | 310 h | 15 |
| October | 26°C | 144 mm | 313 h | 13 |
| November | 26°C | 115 mm | 314 h | 9 |
| December | 25°C | 232 mm | 293 h | 8 |
About 3,373 hours of sun a year. Roughly 131 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.