St. Clair Weather Forecast
- 60
- 82
Rain Showers
- 47
- 71
Rain Showers
- 45
- 65
Partly Sunny
- 53
- 73
Rain Showers
- 53
- 71
Rain Showers Likely
- 47
- 68
Chance Rain Showers
Today 24 Apr Allegheny
Mostly sunny. A slight chance of Showers and Thunderstorms in the afternoon. Unseasonably warm with Highs in the lower 80s. West Winds 5 to 10 Mph. Chance of rain 20 percent.
Tonight 24 Apr Allegheny
Partly cloudy in the Evening, then becoming mostly cloudy. A slight chance of Thunderstorms. A chance of Showers in the Evening, then Showers after midnight. Mild. Lows in the upper 50s. Southwest Winds around 5 Mph. Chance of rain 80 percent.
St. Clair Temperature Statistics
April Temperature
Pittsburgh - Allegheny County Airport (4.3 miles)
Lowest 8 April, 2026
26.1 °FAverage April
58.8 °FHighest 15 April, 2026
82.9 °F
Climate (2021–Present)
Pittsburgh - Allegheny County Airport (4.3 miles)
Average Low 2021–2026
46 °FAverage 2021–2026
54.6 °FAverage High 2021–2026
63.4 °F