San Juan Weather Forecast
San Juan weather: 80°F, light drizzle. Hourly forecast, 14-day outlook, UV, air quality and the best time to visit.
Risk assessment for San Juan
Derived from the current forecast window - not an official warning.
Peak gusts of 25 mph and 3 thunderstorm days in the next 16 days.
Wettest single day forecast at 0,3 in, 1,3 in across the window. Flash flooding risk rises sharply above 50 mm in a day.
16-day forecast for San Juan
Daily highs and lows, precipitation and UV.
| Day | Conditions | High / Low | Precip | Wind | UV |
|---|---|---|---|---|---|
| Sat, Aug 22 | 🌦️ Drizzle | 85° / 78° | 75% · 0,1 in | 17 mph | 8 |
| Sun, Aug 23 | 🌦️ Light drizzle | 86° / 79° | 89% · 0,0 in | 18 mph | 9 |
| Mon, Aug 24 | 🌦️ Light drizzle | 85° / 80° | 61% · 0,0 in | 17 mph | 9 |
| Tue, Aug 25 | ⛈️ Thunderstorm | 84° / 79° | 90% · 0,3 in | 14 mph | 9 |
| Wed, Aug 26 | ⛈️ Thunderstorm | 85° / 81° | 42% · 0,1 in | 16 mph | 9 |
| Thu, Aug 27 | ⛈️ Thunderstorm | 84° / 80° | 74% · 0,2 in | 15 mph | 9 |
| Fri, Aug 28 | 🌦️ Light drizzle | 83° / 81° | 64% · 0,1 in | 17 mph | 9 |
| Sat, Aug 29 | 🌦️ Light drizzle | 84° / 81° | 71% · 0,0 in | 14 mph | 9 |
| Sun, Aug 30 | 🌦️ Light drizzle | 85° / 81° | 75% · 0,0 in | 17 mph | 9 |
| Mon, Aug 31 | 🌦️ Light drizzle | 84° / 81° | 84% · 0,2 in | 6 mph | 9 |
| Tue, Sep 1 | 🌦️ Drizzle | 85° / 79° | 65% · 0,2 in | 7 mph | 9 |
| Wed, Sep 2 | 🌦️ Light drizzle | 88° / 79° | 49% · 0,0 in | 9 mph | 9 |
| Thu, Sep 3 | 🌤️ Mainly clear | 87° / 79° | 63% | 15 mph | 9 |
| Fri, Sep 4 | 🌦️ Light drizzle | 87° / 80° | 70% · 0,0 in | 15 mph | 9 |
| Sat, Sep 5 | ☁️ Overcast | 93° / 78° | 35% | 16 mph | 9 |
| Sun, Sep 6 | ☀️ Clear sky | -- / -- | 48% | -- | — |
What this means for San Juan
Today is about average for August. The forecast high of 85°F is in line with the 86°F typical for this month.
A 75% chance means rain is expected over most of the area. Plan indoor alternatives.
Wet roads are likely; braking distances roughly double in heavy rain.
Northern Hemisphere, so peak summer falls in June to August.
The gap between the warmest and coldest month averages 38°F - an unusually even climate through the year.
See the San Juan forecast by time range
San Juan weather - more answers
Explore San Juan
Every topic we hold for this place, and the same topic for the places around it.
Weather for related places
Frequently asked questions
Where is San Juan?
San Juan is a city in Puerto Rico. Its coordinates are 18.4655, -66.1057. It lies in North America.
What is the weather like in San Juan right now?
It is currently 80°F (27°C) with light drizzle. Humidity is 81% and wind is 8 mph.
When is the best time to visit San Juan?
January, March, May, June, July and December offer the most comfortable conditions in San Juan, which has a temperate climate. February, October and November are usually the hardest months for outdoor plans.
What time zone is San Juan in?
San Juan observes America/Puerto_Rico (UTC-04:00). The local time is 2:07 AM.
How many people live in San Juan?
San Juan has a population of approximately 340.000.
What are the top things to do in San Juan?
Popular options include Virgin Islands National Park.
Related articles
Data sources and methodology
| Place data | USPOTUS Atlas dataset (cities-world) - coordinates, hierarchy and facts. |
|---|---|
| Forecast and observations | Open-Meteo (ECMWF and national models). |
| Air quality and pollen | Copernicus CAMS via Open-Meteo. US AQI scale. |
| Climate averages | ERA5 reanalysis via the Open-Meteo archive, aggregated over 3 years. |
| Official alerts | US National Weather Service. |
| Method | Scores, comparisons and advice on this page are computed from the inputs above. Distances are straight-line. Nothing is estimated where data is missing - the block is simply not shown. |
Last updated August 22, 2026 at 2:07 AM local time. Live blocks refresh every 15 minutes; climate averages monthly.
