Irwin Weather Forecast
- 52
- 64
Rain Showers
- 50
- 62
Rain Showers Likely
- 45
- 65
Partly Sunny
- 45
- 67
Mostly Sunny
- 47
- 68
Partly Sunny
- 49
- 70
Partly Sunny
Today 22 Sep Westmoreland
Showers in the Morning, then a chance of Showers with a slight chance of Thunderstorms in the afternoon. Highs in the lower 60s. East Winds 10 to 15 Mph with Gusts up to 30 Mph. Chance of rain 80 percent.
Tonight 22 Sep Westmoreland
Showers. Lows in the lower 50s. East Winds 15 to 20 Mph with Gusts up to 30 Mph. Chance of rain 90 percent.
Irwin Temperature Statistics
September Temperature
Pittsburgh - Allegheny County Airport (11.2 miles)
Lowest 15 September, 2026
53.1 °FAverage September
71.7 °FHighest 2 September, 2026
91 °F
Climate (2021–2026)
Pittsburgh - Allegheny County Airport (11.2 miles)
Average Low 2021–2026
46 °FAverage 2021–2026
54.6 °FAverage High 2021–2026
63.3 °F