Omaha weather by month
Omaha runs from about -7°C in January to 25°C in July, with May the wettest month at 175 mm.
warmest month
July
25°C
coolest month
January
-7°C
wettest month
May
175 mm
worst air month
February
9 µg/m³
The whole year, month by month.
| Month | Avg temp | Rain | Sun | PM2.5 |
|---|---|---|---|---|
| January | -7°C | 47 mm | 158 h | 8 |
| February | 4°C | 3 mm | 263 h | 9 |
| March | 7°C | 53 mm | 283 h | 7 |
| April | 13°C | 102 mm | 330 h | 6 |
| May | 18°C | 175 mm | 350 h | 6 |
| June | 24°C | 73 mm | 373 h | 7 |
| July | 25°C | 104 mm | 415 h | 7 |
| August | 24°C | 80 mm | 365 h | 8 |
| September | 22°C | 14 mm | 345 h | 9 |
| October | 16°C | 14 mm | 313 h | 5 |
| November | 6°C | 84 mm | 204 h | 6 |
| December | 0°C | 32 mm | 181 h | 9 |
About 3,580 hours of sun a year. Roughly 76 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.