Monongahela Weather Forecast

    • 50
    • 77

    Rain Showers

    • 53
    • 70

    Rain Showers Likely

    • 52
    • 67

    Rain Showers

    • 58
    • 72

    Rain Showers

    • 62
    • 81

    Rain Showers

    • 62
    • 80

    Rain Showers Likely

Today 20 May Washington

A chance of Thunderstorms. Showers. Highs in the mid 70s. Temperatures falling into the mid 60s. West Winds 5 to 10 Mph, becoming northwest with Gusts up to 20 Mph. Chance of rain 90 percent.

Tonight 20 May Washington

A slight chance of Thunderstorms in the evening. Showers likely. Less humid with Lows in the upper 40s. North Winds 5 to 10 Mph. Chance of rain 70 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Monongahela Temperature Statistics

May Temperature

Pittsburgh - Allegheny County Airport (9.9 miles)

  • Lowest 2 May, 2026

    34 °F

  • Average May

    55.9 °F

  • Highest 18 May, 2026

    87.1 °F

Climate (2021–Present)

Pittsburgh - Allegheny County Airport (9.9 miles)

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  • Average Low 2021–2026

    46 °F

  • Average 2021–2026

    54.6 °F

  • Average High 2021–2026

    63.4 °F
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