San Juan Climate and Average Weather
Climate of San Juan: average temperatures, rainfall and seasons month by month.
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).
Recent extremes in San Juan
Highest and lowest readings observed in the last 3 years of reanalysis data - not all-time records.
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 |
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 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.
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 February, October and November - historically the least comfortable months here.
Summary
San Juan is a city in Puerto Rico. San Juan is known for Old San Juan forts and beaches. It has a population of about 340.000.
Right now it is 80°F (27°C) in San Juan with light drizzle. It feels like 87°F. Today runs from 78°F to 85°F. Chance of precipitation is 75%. Sightseeing conditions score 6.4/10 - fair - plan around the weather.
The best time to visit San Juan is January, March, May, June, July and December. The climate is temperate. February, October and November tend to be the least comfortable months. September is the warmest month with average highs near 87°F, while February is the coldest with lows near 73°F.
Nearby highlights include Virgin Islands National Park.
In plain terms. Today is about average for August. The forecast high of 85°F is in line with the 86°F typical for this month. The best window to be outside is roughly 7 AM to 10 AM, when temperature, rain chance and wind line up best. fishing is the strongest bet in San Juan today at 9/10. Wet roads are likely; braking distances roughly double in heavy rain.
Compiled from this page's own data: atlas facts plus live Open-Meteo readings.
Quick facts about San Juan
| Type | City |
|---|---|
| Country | Puerto Rico |
| Continent | North America |
| Coordinates | 18°27′55.8″N 66°6′20.5″W (18.4655, -66.1057) |
| Population | 340.000 |
| Known for | Old San Juan forts and beaches |
| Local time | 3:16 PM (UTC-04:00) |
| Best months | January, March, May, June, July and December |
| Climate | Temperate |
Weather map for San Juan
Animated model layers. Pick a layer to load it.
Animated layers by Windy. For pin-level detail and nearby places, see the interactive map below.
Explore San Juan
Every topic we hold for this place, and the same topic for the places around it.
Climate 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 3:16 PM.
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 3:16 PM local time. Live blocks refresh every 15 minutes; climate averages monthly.
