Costilla Weather Forecast

    • 32
    • 54

    Decreasing Clouds

    • 29
    • 59

    Mostly Sunny

    • 30
    • 59

    Mostly Cloudy

    • 32
    • 53

    Mostly Cloudy

    • 30
    • 52

    Mostly Cloudy

    • 26
    • 50

    Mostly Cloudy

Today 21 Dec Upper Rio Grande Valley

Mostly sunny. Highs in the mid 50s. Southwest Winds 15 to 20 Mph.

Tonight 21 Dec Upper Rio Grande Valley

Cold. Mostly clear. Lows in the upper 20s. South Winds 15 to 20 Mph.

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Costilla Temperature Statistics

December Temperature

San Luis Valley Regional Airport (36.7 miles)

  • Lowest 5 December, 2025

    0 °F

  • Average December

    25.9 °F

  • Highest 19 December, 2025

    62.1 °F

Climate (2020–Present)

San Luis Valley Regional Airport (36.7 miles)

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  • Average Low 2020–2025

    26.6 °F

  • Average 2020–2025

    44.6 °F

  • Average High 2020–2025

    62.5 °F
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