Stewart Lake Weather Forecast

    • 41
    • 60

    Rain Showers

    • 39
    • 47

    Rain Showers

    • 41
    • 55

    Mostly Sunny

    • 47
    • 63

    Mostly Sunny

    • 49
    • 64

    Partly Sunny

    • 46
    • 60

    Chance Rain

Today 6 Sep Butte/Blackfoot Region

Mostly cloudy. Areas of rain in the morning. Chance of Showers and Thunderstorms late in the afternoon. Chance of precipitation 50 percent. Highs in the upper 60s to mid 70s.

Tonight 6 Sep Butte/Blackfoot Region

Chance of Showers and Thunderstorms in the Evening, then rain Showers likely and a slight chance of Thunderstorms after midnight. Chance of precipitation 90 percent. Lows in the 40s.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Stewart Lake Temperature Statistics

September Temperature

Butte, Bert Mooney Airport (44.7 miles)

  • Lowest 3 September, 2026

    41 °F

  • Average September

    60.1 °F

  • Highest 1 September, 2026

    79.6 °F

Climate (2021–2026)

Butte, Bert Mooney Airport (44.7 miles)

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  • Average Low 2021–2026

    28.5 °F

  • Average 2021–2026

    42.3 °F

  • Average High 2021–2026

    55.8 °F
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