Guaynabo Weather Forecast

    • 77
    • 90

    Rain Showers

    • 76
    • 89

    Rain Showers

    • 77
    • 89

    Rain Showers

    • 76
    • 90

    Rain Showers

    • 76
    • 90

    Rain Showers

    • 75
    • 89

    Rain Showers

    • 75
    • 90

    Rain Showers

Today 28 Sep San Juan and Vicinity

Partly cloudy with isolated Showers in the Morning, then variably cloudy with scattered Showers in the afternoon. Highs around 92. Temperature falling in the afternoon. Chance of rain 50 percent.

Tonight 28 Sep San Juan and Vicinity

Partly cloudy with isolated Showers this Evening, then variably cloudy with scattered Showers with isolated Thunderstorms after midnight. Lows around 82. East Winds 5 to 10 Mph. Chance of rain 50 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Guaynabo Temperature Statistics

September Temperature

San Juan Fernando Luis Ribas Dominicci (6.8 miles)

  • Lowest 1 September, 2026

    77 °F

  • Average September

    85.7 °F

  • Highest 17 September, 2026

    91.4 °F

Climate (2021–2026)

San Juan Fernando Luis Ribas Dominicci (6.8 miles)

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  • Average Low 2021–2026

    77.8 °F

  • Average 2021–2026

    82.7 °F

  • Average High 2021–2026

    85.4 °F
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