Baton Rouge weather by month
Baton Rouge runs from about 10°C in January to 29°C in August, with September the wettest month at 291 mm.
warmest month
August
29°C
coolest month
January
10°C
wettest month
September
291 mm
worst air month
June
13 µg/m³
The whole year, month by month.
| Month | Avg temp | Rain | Sun | PM2.5 |
|---|---|---|---|---|
| January | 10°C | 222 mm | 227 h | 10 |
| February | 14°C | 97 mm | 225 h | 10 |
| March | 17°C | 179 mm | 250 h | 7 |
| April | 21°C | 86 mm | 290 h | 7 |
| May | 26°C | 133 mm | 313 h | 9 |
| June | 28°C | 71 mm | 362 h | 13 |
| July | 28°C | 159 mm | 307 h | 12 |
| August | 29°C | 58 mm | 339 h | 13 |
| September | 26°C | 291 mm | 282 h | 10 |
| October | 22°C | 24 mm | 321 h | 7 |
| November | 19°C | 135 mm | 261 h | 8 |
| December | 14°C | 153 mm | 239 h | 9 |
About 3,416 hours of sun a year. Roughly 161 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.