Johnstown Weather Forecast

    • 50
    • 69

    Mostly Cloudy

    • 52
    • 72

    Mostly Cloudy

    • 50
    • 70

    Mostly Cloudy

    • 48
    • 67

    Mostly Cloudy

    • 47
    • 69

    Partly Sunny

    • 50
    • 69

    Partly Sunny

    • 52
    • 69

    Partly Sunny

Today 17 Sep Grand Forks

Mostly sunny. Highs 70 to 75.

Tonight 17 Sep Grand Forks

Mostly cloudy. Lows 50 to 55. East Winds up to 10 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Johnstown Temperature Statistics

September Temperature

Grand Forks Air Force Base (12.4 miles)

  • Lowest 13 September, 2026

    41.9 °F

  • Average September

    65.2 °F

  • Highest 10 September, 2026

    85.6 °F

Climate (2021–2026)

Grand Forks Air Force Base (12.4 miles)

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  • Average Low 2021–2026

    31.7 °F

  • Average 2021–2026

    42.2 °F

  • Average High 2021–2026

    52.2 °F
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