San Juan Weather Forecast
San Juan weather: 86°F, partly cloudy. Hourly forecast, 14-day outlook, UV, air quality and the best time to visit.
San Juan weather in May
Weather map for San Juan
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Climate in San Juan month by month
Average high, average low and total rainfall, based on three years of reanalysis data.
| Month | Avg high | Avg low | Rainfall | Rating |
|---|---|---|---|---|
| January | 81° | 74° | 2,2 in | ★★★★☆ |
| February | 81° | 73° | 4,6 in | ★★★★☆ |
| March | 81° | 74° | 3,0 in | ★★★★☆ |
| April | 82° | 74° | 4,8 in | ★★★★☆ |
| May | 84° | 77° | 3,4 in | ★★★★☆ |
| June | 85° | 79° | 2,4 in | ★★★★☆ |
| July | 85° | 79° | 2,4 in | ★★★★☆ |
| August | 86° | 79° | 3,8 in | ★★★★☆ |
| September | 87° | 79° | 4,0 in | ★★★★☆ |
| October | 87° | 78° | 5,0 in | ★★★☆☆ |
| November | 84° | 77° | 5,3 in | ★★★☆☆ |
| December | 82° | 75° | 3,4 in | ★★★★☆ |
Climate type: Temperate. Source: Open-Meteo archive (ERA5).
Best time to visit San Juan
Go in January, March, May, June, July and December. These months score highest on comfortable temperatures, low rainfall and useful daylight.
Hardest months: February, October and November - expect the least comfortable mix of heat, cold or rain.
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 - 6 of the next 7 days carry a real chance of rain
- High-factor sunscreen and a long-sleeve sun layer for midday
- Avoid unshaded sightseeing between 10am and 4pm - the UV index peaks at 8.
- If your dates are flexible, avoid February, October and November - historically the least comfortable months here.
How San Juan compares with nearby places
Annual averages, and the difference against San Juan.
| Place | Distance | Avg temp | vs here | Annual rain |
|---|---|---|---|---|
| Virgin Islands National Park | 89 mi | 78°F | 34°F cooler | 40 in |
| Dominican Republic | 251 mi | 78°F | 34°F cooler | 59 in |
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 86°F (30°C) with partly cloudy. Humidity is 69% and wind is 12 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 11:33 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 25, 2026 at 11:33 AM local time. Live blocks refresh every 15 minutes; climate averages monthly.
