Pittsburgh weather by month
Pittsburgh runs from about 0°C in January to 24°C in July, with April the wettest month at 249 mm.
warmest month
July
24°C
coolest month
January
0°C
wettest month
April
249 mm
worst air month
July
17 µg/m³
The whole year, month by month.
| Month | Avg temp | Rain | Sun | PM2.5 |
|---|---|---|---|---|
| January | 0°C | 132 mm | 108 h | 9 |
| February | 3°C | 70 mm | 228 h | 15 |
| March | 7°C | 114 mm | 235 h | 9 |
| April | 12°C | 249 mm | 253 h | 10 |
| May | 18°C | 159 mm | 326 h | 8 |
| June | 22°C | 76 mm | 359 h | 11 |
| July | 24°C | 126 mm | 369 h | 17 |
| August | 22°C | 127 mm | 345 h | 14 |
| September | 20°C | 127 mm | 269 h | 14 |
| October | 13°C | 35 mm | 299 h | 7 |
| November | 8°C | 99 mm | 153 h | 8 |
| December | 2°C | 71 mm | 145 h | 10 |
About 3,089 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.