Sumner Lake Weather Forecast

    • 45
    • 65

    Mostly Sunny

    • 43
    • 65

    Chance Rain Showers

    • 45
    • 59

    Slight Chance Rain Showers

    • 46
    • 56

    Mostly Cloudy

    • 46
    • 56

    Mostly Cloudy

    • 45
    • 55

    Chance Rain Showers

Today 22 Jun Keweenaw

Mostly sunny. Highs 63 to 68 inland to around 62 at the shore. Light north Winds, becoming northwest 5 to 10 Mph in the afternoon.

Tonight 22 Jun Keweenaw

Mostly clear. Lows 46 to 51. Light west Winds.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Sumner Lake Temperature Statistics

June Temperature

Copper Harbor (53.4 miles)

  • Lowest 18 June, 2026

    43 °F

  • Average June

    57.3 °F

  • Highest 2 June, 2026

    75.9 °F

Climate (2021–2026)

Copper Harbor (53.4 miles)

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  • Average Low 2021–2026

    38.4 °F

  • Average 2021–2026

    44.5 °F

  • Average High 2021–2026

    50.7 °F
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