- Clothing
- Light waterproof jacket with an umbrella is a smart choice.
Tomorrow's Weather Forecast - San Juan
Tomorrow's weather in San Juan. high 30°C (86°F), low 27°C (81°F). Drizzle.
Tomorrow’s Outlook
Tomorrow brings a similar temperature to today. Showers are likely in the afternoon and evening, with rain probability peaking near 69%. That risk lines up with humidity averaging 76% through the day the more moisture in the air, the more readily clouds build into showers. Humidity stays high near 76%, so it will feel muggier and stickier than the temperature alone suggests. Expect a steady breeze around 25 km/h through the day. Sunrise is at 6:11 AM and sunset at 6:29 PM, for about 12h 18m of daylight.
- Tomorrow
- 30°/ 27°
- Today30° / 27°
Tomorrow’s Hourly Weather Outlook
Morning6 AM – Noon29°
- Rain probability
- 24%
- Wind speed
- 22 km/h
AfternoonNoon – 6 PM30°
- Rain probability
- 69%
- Wind speed
- 25 km/h
Evening6 PM – Midn29°
- Rain probability
- 50%
- Wind speed
- 22 km/h
NightMidn – 6 AM28°
- Rain probability
- 0%
- Wind speed
- 17 km/h
24-Hour Rain & Temperature Forecast
Tomorrow12 Sep
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Planning Advice for Tomorrow
- Outdoor
- Outdoor plans may need flexibility; showers are likely.
- Travel
- Wet roads may slow traffic; allow a little extra time.
Sunrise & Sunset
Sunrise
Dawn 5:41 AMTotal Daylight
Full day forecastSolar noon 12:20 PM
Sunset
Dusk 6:59 PMvs today-1 min daylight
Sunrise shiftSame time
Sunset shift1 min earlier
5-Day Weather Forecast
Full 15-Day ForecastWeather Insight
San Juan is forecast to reach a high of 30°C tomorrow, with an overnight low around 27°C. Expect a high chance of rain (69% probability) and moderate breezes averaging 25 km/h. Air quality is currently Moderate (AQI 65), driven mainly by PM2.5 at 18 μg/m³.
Today vs Normal
30°C0° below normal
The long-term average high for today is 30°C.
28 of the last 28 days with published data ran above normal.
That's a break from the pattern - today's forecast runs below normal even though the recent stretch mostly ran above.
Red = above normal, blue = at or below · last 12 days
Air Quality
Air Quality
Moderate
Air quality is acceptable for most people. Unusually sensitive individuals should consider reducing prolonged or heavy outdoor exertion.