See exactly when rain will start and stop with a minute-by-minute precipitation nowcast for the next hour.
27°
Partly Cloudy
Feels Like: 31°
Min: 26°
Max: 30°
The next few hours will be mostly cloudy, with tomorrow reaching 29°C and dropping to 26°C. The coming days will be light rain throughout the day.
Compare today's weather with yesterday's data and track temperature trends over time.
Hourly Forecast
Daylight Hours
05:48
Sunrise
17:48
Sunset
Moon
Waxing Gibbous
13:24
Moonrise
00:47
Moonset
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View stargazing scoreWeather in San Juan tomorrow, September 21, 2026
San Juan starts September 21, 2026 looking damp, with rain in the forecast and wetter spells likely at times. Waterproof kit is the safer call for early plans. Morning plans should assume damp conditions, as rain chances climb toward 58% around 03:00. Cloud cover is also at its densest near 11:00 at roughly 59%.
Expect highs of 29°C and cooler readings close to 25°C. The air stays humid, with relative humidity between 74% and 92% and the peak around 05:00. Winds stay light, near 3.7 km/h by 14:00, so the day feels still more than breezy.
Expect the wet theme to continue later, as rain odds reach 98% near 15:00. Cloud amounts hold near 75% around 20:00. Horizontal visibility sits around 15.7 km, briefly nearer 7.4 km. Expect sunrise at 05:48, sunset at 17:47, and 11 hours 59 minutes of sunlight today overall.
Overall, San Juan on September 21, 2026 suits indoor plans or waterproof kit, especially while rain chances stay near 98% and the high sits around 29°C.
Frequently asked questions about weather in San Juan
How warm does it get in San Juan?
The warmest month in San Juan is May, with average high temperatures of 34°C. The average temperature during this period is around 30°C.
How cold does it get in San Juan?
The coldest month in San Juan is February, with average low temperatures of 25°C. The average temperature during this period is around 27°C.
What is the wettest time of year in San Juan?
The wettest month in San Juan is July, with an average of 362mm of precipitation.
What is the driest time of year in San Juan?
The driest month in San Juan is March, with an average of 10mm of precipitation.
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