Boulder Weather Forecast

    • 77
    • 92

    Chance Rain Showers

    • 76
    • 93

    Mostly Sunny

    • 76
    • 91

    Mostly Sunny

    • 75
    • 93

    Partly Sunny

    • 71
    • 89

    Chance Rain Showers

    • 67
    • 82

    Chance Rain Showers

Today 16 Sep Clinton

Mostly sunny with a slight chance of Thunderstorms. A chance of Showers, mainly in the morning. Hot with Highs in the mid 90s. East Winds around 5 Mph, becoming southwest around 5 Mph in the afternoon. Chance of rain 30 percent. Heat index Values up to 107.

Tonight 16 Sep Clinton

Partly cloudy with a slight chance of Showers and Thunderstorms in the Evening, then mostly clear after midnight. Lows in the mid 70s. South Winds around 5 Mph. Chance of rain 20 percent. Heat index Values up to 104 early in the evening.

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Boulder Temperature Statistics

September Temperature

Salem, Salem-Leckrone Airport (14.3 miles)

  • Lowest 8 September, 2026

    57.6 °F

  • Average September

    81.6 °F

  • Highest 5 September, 2026

    102.4 °F

Climate (2021–2026)

Salem, Salem-Leckrone Airport (14.3 miles)

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  • Average Low 2021–2026

    49.8 °F

  • Average 2021–2026

    59.2 °F

  • Average High 2021–2026

    68.8 °F
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