See exactly when rain will start and stop with a minute-by-minute precipitation nowcast for the next hour.
29°
Light Rain
Feels Like: 35°
Min: 25°
Max: 29°
The next few hours will be mostly clear, with today reaching 29°C and dropping to 25°C. The coming days will be drizzle throughout the day.
Compare today's weather with yesterday's data and track temperature trends over time.
Hourly Forecast
Daylight Hours
05:48
Sunrise
17:51
Sunset
Moon
Waxing Crescent
09:56
Moonrise
21:24
Moonset
Daily Forecast
Today
Thursday
Friday
Saturday
Sunday
Monday
Tuesday
Wednesday
Thursday
Friday
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Weather in San Juan today, September 16, 2026
Rain features in San Juan on September 16, 2026, so keep waterproofs handy through the day. The damp theme is strongest where shower chances rise.
The day peaks near 29°C and cools toward 25°C. Relative humidity sits between 75% and 92%, reaching its peak around 20:00. Winds stay light, near 0.8 km/h by 17:00, so the day feels still more than breezy.
Through the afternoon wet weather remains a factor, with rain chances near 100% around 15:00. Cloud also stays substantial, close to 97% near 20:00. Horizontal visibility sits around 15.2 km, briefly nearer 10.1 km. Daylight runs from 05:48 to 17:51, lasting 12 hours 3 minutes of sunlight today.
In short, treat September 16, 2026 in San Juan as a damp day: pack covers, watch the wetter hours, and expect a high near 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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