Tennant Lake Weather Forecast

    • 50
    • 71

    Becoming Sunny

    • 51
    • 73

    Mostly Sunny

    • 54
    • 71

    Rain

    • 51
    • 69

    Chance Rain

    • 51
    • 68

    Chance Rain

    • 52
    • 71

    Chance Rain

Today 18 Sep Lowlands of Western Whatcom County

Mostly sunny. Highs in the mid 60s to lower 70s. South wind to 10 Mph becoming west in the afternoon.

Tonight 18 Sep Lowlands of Western Whatcom County

Mostly clear. Areas of smoke in the evening. Lows in the upper 40s to mid 50s. Southwest wind to 10 Mph in the evening becoming light.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Tennant Lake Temperature Statistics

September Temperature

Bellingham, Bellingham International Airport (2.5 miles)

  • Lowest 13 September, 2025

    52 °F

  • Average September

    61.9 °F

  • Highest 3 September, 2025

    79 °F

Climate (2020–Present)

Bellingham, Bellingham International Airport (2.5 miles)

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  • Average Low 2020–2025

    44.1 °F

  • Average 2020–2025

    51.3 °F

  • Average High 2020–2025

    59 °F
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