Atlanta weather by month
Atlanta runs from about 5°C in January to 27°C in June, with July the wettest month at 245 mm.
warmest month
June
27°C
coolest month
January
5°C
wettest month
July
245 mm
worst air month
December
15 µg/m³
The whole year, month by month.
| Month | Avg temp | Rain | Sun | PM2.5 |
|---|---|---|---|---|
| January | 5°C | 193 mm | 218 h | 15 |
| February | 10°C | 109 mm | 220 h | 11 |
| March | 13°C | 161 mm | 248 h | 10 |
| April | 17°C | 106 mm | 294 h | 9 |
| May | 22°C | 149 mm | 326 h | 9 |
| June | 27°C | 46 mm | 367 h | 13 |
| July | 26°C | 245 mm | 319 h | 13 |
| August | 26°C | 33 mm | 389 h | 14 |
| September | 23°C | 205 mm | 271 h | 14 |
| October | 18°C | 3 mm | 320 h | 7 |
| November | 14°C | 67 mm | 207 h | 10 |
| December | 7°C | 68 mm | 220 h | 15 |
About 3,399 hours of sun a year. Roughly 140 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 2026-05-23. Full method, licences and the list of sources we rejected are on the methodology page.