San Mateo Reservoir Weather Forecast

    • 29
    • 51

    Mostly Sunny

    • 32
    • 59

    Mostly Sunny

    • 37
    • 53

    Mostly Sunny

    • 40
    • 62

    Mostly Sunny

    • 38
    • 60

    Mostly Sunny

    • 36
    • 58

    Mostly Sunny

Today 16 Dec West Central Mountains

Sunny. Highs in the mid 50s. Northwest Winds around 15 Mph.

Tonight 16 Dec West Central Mountains

Mostly clear. Cold with Lows in the upper 20s.

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  • Temperature Real-Time

San Mateo Reservoir Temperature Statistics

December Temperature

Grants, Grants-Milan Municipal Airport (18.6 miles)

  • Lowest 5 December, 2025

    12 °F

  • Average December

    37.6 °F

  • Highest 11 December, 2025

    65.3 °F

Climate (2020–Present)

Grants, Grants-Milan Municipal Airport (18.6 miles)

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  • Average Low 2020–2025

    34.2 °F

  • Average 2020–2025

    52.2 °F

  • Average High 2020–2025

    67.4 °F
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