Big Diamond Lake Weather Forecast

    • 51
    • 66

    Mostly Cloudy

    • 52
    • 65

    Rain Showers

    • 49
    • 67

    Mostly Cloudy

    • 54
    • 67

    Rain Showers Likely

    • 51
    • 64

    Rain Showers Likely

    • 46
    • 66

    Slight Chance Rain Showers

    • 44
    • 64

    Mostly Cloudy

Today 25 Sep South Itasca

Mostly cloudy. A 20 percent chance of Showers. Lows in the mid 40s. Highs in the mid 60s.

Tonight 25 Sep South Itasca

Mostly cloudy. Lows in the lower 50s. Southeast Winds 5 to 10 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Big Diamond Lake Temperature Statistics

September Temperature

Grand Rapids, Grand Rapids/Itasca County Airport-Gordon Newstrom Field (10.6 miles)

  • Lowest 14 September, 2026

    37 °F

  • Average September

    61.3 °F

  • Highest 6 September, 2026

    82 °F

Climate (2021–2026)

Grand Rapids, Grand Rapids/Itasca County Airport-Gordon Newstrom Field (10.6 miles)

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  • Average Low 2021–2026

    32 °F

  • Average 2021–2026

    41.6 °F

  • Average High 2021–2026

    50.7 °F
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