Garrison Dam Weather Forecast

    • 37
    • 43

    Rain Showers

    • 34
    • 41

    Rain Showers

    • 34
    • 47

    Rain Showers Likely

    • 40
    • 63

    Partly Sunny

    • 41
    • 61

    Chance Rain Showers

    • 44
    • 61

    Chance Rain Showers

Today 19 May McLean

Showers. Highs in the mid 40s. Northeast Winds 20 to 25 Mph with Gusts up to 35 Mph.

Tonight 19 May McLean

Showers. Lows in the upper 30s. Northeast Winds 10 to 20 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Garrison Dam Temperature Statistics

May Temperature

Garrison (10.6 miles)

  • Lowest 1 May, 2025

    33.7 °F
  • Average May

    58.6 °F
  • Highest 11 May, 2025

    97.6 °F

Climate (2020–Present)

Garrison (10.6 miles)

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  • Average Low 2020–2025

    31.3 °F
  • Average 2020–2025

    42.7 °F
  • Average High 2020–2025

    54.2 °F
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