Irwin Weather Forecast
- 49
- 76
Rain Showers
- 52
- 69
Rain Showers Likely
- 53
- 65
Rain Showers
- 58
- 70
Rain Showers
- 59
- 78
Rain Showers Likely
- 61
- 80
Chance Rain Showers
Today 20 May Westmoreland
A chance of Thunderstorms. A chance of Showers in the Morning, then Showers in the afternoon. Humid with Highs in the mid 70s. Temperatures falling into the upper 60s in the afternoon. Southwest Winds 5 to 10 Mph, becoming northwest with Gusts up to 20 Mph in the afternoon. Chance of rain 90 percent.
Tonight 20 May Westmoreland
Considerable cloudiness. A chance of Showers with a slight chance of Thunderstorms in the Evening, then Showers likely after midnight. Much cooler. Less humid with Lows in the upper 40s. North Winds 5 to 10 Mph. Chance of rain 70 percent.
Irwin Temperature Statistics
May Temperature
Pittsburgh - Allegheny County Airport (11.2 miles)
Lowest 2 May, 2026
34 °FAverage May
54.6 °FHighest 17 May, 2026
82 °F
Climate (2021–Present)
Pittsburgh - Allegheny County Airport (11.2 miles)
Average Low 2021–2026
46 °FAverage 2021–2026
54.6 °FAverage High 2021–2026
63.4 °F