Sebastian Weather Forecast

    • 56
    • 74

    Mostly Sunny

    • 65
    • 84

    Mostly Sunny

    • 66
    • 86

    Partly Sunny

    • 65
    • 84

    Partly Sunny

    • 63
    • 83

    Mostly Sunny

    • 62
    • 83

    Mostly Sunny

Today 19 Dec Inland Willacy

Sunny. Highs in the mid 70s. Northeast Winds 5 to 10 Mph.

Tonight 19 Dec Inland Willacy

Mostly clear. Lows in the mid 50s. Southeast Winds around 5 Mph.

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Sebastian Temperature Statistics

December Temperature

Harlingen, Rio Grande Valley International Airport (11.2 miles)

  • Lowest 9 December, 2025

    43 °F

  • Average December

    61.8 °F

  • Highest 7 December, 2025

    86 °F

Climate (2020–Present)

Harlingen, Rio Grande Valley International Airport (11.2 miles)

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  • Average Low 2020–2025

    65.5 °F

  • Average 2020–2025

    75.4 °F

  • Average High 2020–2025

    86.2 °F
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