Lake John Weather Forecast

    • 42
    • 63

    Increasing Clouds

    • 40
    • 50

    Mostly Cloudy

    • 44
    • 51

    Rain Showers

    • 38
    • 49

    Chance Rain Showers

    • 36
    • 45

    Chance Rain Showers

    • 36
    • 45

    Mostly Cloudy

Today 13 May Keweenaw

Sunny. Unseasonably warm with Highs in the mid 80s. South Winds 5 to 10 Mph, becoming southeast with Gusts up to 20 Mph in the afternoon.

Tonight 13 May Keweenaw

Mostly clear. Lows around 44 inland to around 50 at the shore. Southeast Winds 5 to 15 Mph, becoming south 5 to 10 Mph after midnight.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Lake John Temperature Statistics

May Temperature

Copper Harbor (52.2 miles)

  • Lowest 8 May, 2025

    33.7 °F

  • Average May

    45.9 °F

  • Highest 9 May, 2025

    71.7 °F

Climate (2020–Present)

Copper Harbor (52.2 miles)

Take a look at our website widgetsAvailable free! Find Out More

  • Average Low 2020–2025

    38.6 °F

  • Average 2020–2025

    44.7 °F

  • Average High 2020–2025

    50.8 °F
Get WillyWeather+ to remove ads