Austin weather by month
Austin runs from about 8°C in January to 30°C in August, with May the wettest month at 267 mm.
warmest month
August
30°C
coolest month
January
8°C
wettest month
May
267 mm
worst air month
February
10 µg/m³
The whole year, month by month.
| Month | Avg temp | Rain | Sun | PM2.5 |
|---|---|---|---|---|
| January | 8°C | 112 mm | 225 h | 9 |
| February | 15°C | 81 mm | 221 h | 10 |
| March | 18°C | 84 mm | 247 h | 6 |
| April | 21°C | 155 mm | 249 h | 7 |
| May | 25°C | 267 mm | 269 h | 8 |
| June | 28°C | 148 mm | 348 h | 9 |
| July | 28°C | 110 mm | 357 h | 7 |
| August | 30°C | 42 mm | 374 h | 10 |
| September | 27°C | 86 mm | 314 h | 8 |
| October | 25°C | 4 mm | 330 h | 7 |
| November | 19°C | 59 mm | 273 h | 6 |
| December | 15°C | 66 mm | 209 h | 7 |
About 3,416 hours of sun a year. Roughly 122 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 2026-05-22. Full method, licences and the list of sources we rejected are on the methodology page.