Guaynabo Weather Forecast

    • 77
    • 89

    Rain Showers

    • 76
    • 89

    Rain Showers

    • 76
    • 88

    Rain Showers

    • 77
    • 89

    Rain Showers

    • 77
    • 89

    Rain Showers

    • 78
    • 90

    Rain Showers

Today 5 Sep San Juan and Vicinity

Mostly Cloudy, then becoming variably cloudy this late morning and early Afternoon, then becoming mostly cloudy. Isolated Thunderstorms. Scattered Showers this Morning, then numerous Showers this afternoon. Highs around 91. Temperature falling this afternoon. East Winds 10 to 15 Mph with Gusts up to 25 Mph. Chance of rain 60 percent.

Tonight 5 Sep San Juan and Vicinity

Variably cloudy in the evening then clearing. Isolated Thunderstorms in the evening. Isolated Showers. Lows around 82. Southeast Winds 5 to 10 Mph. Chance of rain 20 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, 2025

    80.6 °F

  • Average September

    85.8 °F

  • Highest 3 September, 2025

    89.6 °F

Climate (2020–Present)

San Juan Fernando Luis Ribas Dominicci (6.8 miles)

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  • Average Low 2020–2025

    77.6 °F

  • Average 2020–2025

    82.4 °F

  • Average High 2020–2025

    85.1 °F
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