Peterson Lake Weather Forecast

    • 42
    • 52

    Rain Likely

    • 44
    • 58

    Mostly Sunny

    • 46
    • 60

    Mostly Sunny

    • 45
    • 59

    Mostly Sunny

    • 45
    • 58

    Mostly Sunny

    • 47
    • 61

    Partly Sunny

Today 19 Sep Bitterroot/Sapphire Mountains

Rain likely in the Morning, then rain Showers likely and a slight chance of Thunderstorms in the afternoon. Areas of fog early in the Morning, then patchy fog late in the morning. Chance of precipitation 70 percent. Highs in the 50s to lower 60s.

Tonight 19 Sep Bitterroot/Sapphire Mountains

Partly cloudy. Patchy fog. Lows in the upper 30s to mid 40s.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Peterson Lake Temperature Statistics

September Temperature

Missoula, Missoula International Airport (20.5 miles)

  • Lowest 9 September, 2026

    38.6 °F

  • Average September

    58.3 °F

  • Highest 1 September, 2026

    88.6 °F

Climate (2021–2026)

Missoula, Missoula International Airport (20.5 miles)

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  • Average Low 2021–2026

    36 °F

  • Average 2021–2026

    47.6 °F

  • Average High 2021–2026

    59.7 °F
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