San Juan Weather Forecast
San Juan weather: 81°F, partly cloudy. Hourly forecast, 14-day outlook, UV, air quality and the best time to visit.
Will it rain in San Juan?
Yes - rain is likely in San Juan today.
A 72% chance means rain is expected over most of the area. Plan indoor alternatives.
Over the next 7 days, about 0,3 in of precipitation is forecast, with the wettest days falling on Fri, Sat, Sun, Mon, Tue, Wed and Thu.
The next 7 days look unusually dry - roughly 23% of a normal October week (0,3 in against 1,2 in).
16-day forecast for San Juan
Daily highs and lows, precipitation and UV.
| Day | Conditions | High / Low | Precip | Wind | UV |
|---|---|---|---|---|---|
| Fri, Oct 23 | 🌦️ Light drizzle | 88° / 80° | 72% · 0,1 in | 10 mph | 8 |
| Sat, Oct 24 | 🌦️ Light drizzle | 87° / 80° | 77% · 0,0 in | 10 mph | 8 |
| Sun, Oct 25 | 🌦️ Light drizzle | 89° / 80° | 67% · 0,0 in | 10 mph | 8 |
| Mon, Oct 26 | ☁️ Overcast | 89° / 80° | 49% | 10 mph | 8 |
| Tue, Oct 27 | 🌦️ Drizzle | 89° / 78° | 46% · 0,2 in | 8 mph | 7 |
| Wed, Oct 28 | 🌤️ Mainly clear | 88° / 78° | 63% | 10 mph | 6 |
| Thu, Oct 29 | ☀️ Clear sky | 86° / 78° | 52% | 16 mph | 6 |
| Fri, Oct 30 | 🌦️ Light drizzle | 87° / 78° | 58% · 0,1 in | 7 mph | 7 |
| Sat, Oct 31 | ☁️ Overcast | 84° / 77° | 74% | 17 mph | 8 |
| Sun, Nov 1 | 🌦️ Light drizzle | 84° / 78° | 61% · 0,1 in | 15 mph | 8 |
| Mon, Nov 2 | 🌦️ Light drizzle | 85° / 79° | 85% · 0,1 in | 14 mph | 7 |
| Tue, Nov 3 | 🌦️ Light drizzle | 86° / 78° | 80% · 0,0 in | 16 mph | 6 |
| Wed, Nov 4 | 🌦️ Light drizzle | 85° / 76° | 69% · 0,0 in | 15 mph | 7 |
| Thu, Nov 5 | ☀️ Clear sky | 85° / 78° | 79% | 16 mph | 7 |
| Fri, Nov 6 | 🌦️ Light drizzle | 85° / 75° | 39% · 0,0 in | 16 mph | 7 |
| Sat, Nov 7 | ☀️ Clear sky | -- / -- | 49% | -- | — |
What this means for San Juan
Today is about average for October. The forecast high of 88°F is in line with the 87°F typical for this month.
A 72% 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.
What to pack, what to skip
- Lightweight, light-coloured clothing and a refillable water bottle
- Sunglasses, a brimmed hat and SPF 30+
- A packable rain shell - 7 of the next 7 days carry a real chance of rain
- If your dates are flexible, avoid August, October and November - historically the least comfortable months here.
See the San Juan forecast by time range
San Juan weather - more answers
Explore San Juan
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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 81°F (27°C) with partly cloudy. Humidity is 85% and wind is 5 mph.
When is the best time to visit San Juan?
January, March, May, June, July, September and December offer the most comfortable conditions in San Juan, which has a temperate climate. August, 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 5:51 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 October 23, 2026 at 5:51 AM local time. Live blocks refresh every 15 minutes; climate averages monthly.
