Costilla Weather Forecast

    • 43
    • 75

    Isolated Thunderstorms

    • 38
    • 75

    Thunderstorms

    • 41
    • 72

    Isolated Thunderstorms

    • 43
    • 74

    Partly Sunny

    • 43
    • 75

    Mostly Sunny

    • 43
    • 77

    Mostly Sunny

Today 16 Sep Upper Rio Grande Valley

Mostly sunny this Morning, then partly cloudy with isolated Showers and Thunderstorms this afternoon. Highs in the mid 70s. Southwest Winds around 15 Mph this afternoon. Chance of rain 20 percent.

Tonight 16 Sep Upper Rio Grande Valley

Partly cloudy with isolated Showers and Thunderstorms in the Evening, then mostly clear after midnight. Lows in the lower 40s. South Winds around 15 Mph in the evening. Chance of rain 20 percent.

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Costilla Temperature Statistics

September Temperature

San Luis Valley Regional Airport (36.7 miles)

  • Lowest 9 September, 2025

    39 °F

  • Average September

    58.2 °F

  • Highest 2 September, 2025

    81 °F

Climate (2020–Present)

San Luis Valley Regional Airport (36.7 miles)

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  • Average Low 2020–2025

    26.4 °F

  • Average 2020–2025

    44.5 °F

  • Average High 2020–2025

    62.4 °F
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