Weather radar San Juan
Real-time precipitation radar · Puerto Rico · Puerto Rico
San Juan climate table – average temperature, precipitation & sunshine hours
The climate table for San Juan shows long-term monthly averages (2000–2023): average high and average low temperature in °C, monthly precipitation (mm), rainy days and sunshine hours per month. Data source: ERA5 reanalysis (ECMWF) via the WDTEC Climate Archive.
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 28° | 27.8° | 28.3° | 28.5° | 29.9° | 30.8° | 30.7° | 31.1° | 31° | 30.8° | 29.5° | 28.3° |
| Avg low (°C) | 23.6° | 23.4° | 23.6° | 24° | 25.3° | 26.2° | 26.5° | 26.8° | 26.7° | 26.4° | 25.4° | 24.2° |
| Precipitation (mm) | 34 | 49 | 31 | 92 | 87 | 62 | 66 | 90 | 150 | 137 | 90 | 46 |
| Rainy days | 10 | 13 | 10 | 15 | 15 | 12 | 17 | 18 | 22 | 20 | 17 | 12 |
| Sunshine hours | 321 | 300 | 341 | 340 | 356 | 356 | 363 | 342 | 316 | 306 | 292 | 312 |
| Humidity | 78% | 78% | 77% | 78% | 80% | 78% | 80% | 80% | 82% | 81% | 82% | 80% |
Best time to visit San Juan
The best time to visit San Juan is typically March. In this month the average high is 28.3°C, precipitation is 31 mm and sunshine duration is 341 hours. The annual average high is 29.6°C, total annual precipitation is 934 mm (181 rainy days/year) and annual sunshine is 3945 hours.
Frequently asked questions about the weather in San Juan
How up to date is the weather radar for San Juan?
The weather radar for San Juan is updated every 5 minutes with new radar data from the OPERA composite radar. A 2-hour forecast animation is also available. Rainfall probability, wind gusts and UV index are available up to 14 days in advance.
What weather data is available for San Juan?
Besides the rain radar, RadarWeather provides for San Juan: rainfall probability, thunderstorm warning (CAPE index), wind gusts, UV index, air pressure, humidity, dew point, sunshine hours, snow line and a 14-day forecast based on ICON-D2, ECMWF IFS and GFS.
When are thunderstorms expected in San Juan?
The thunderstorm potential for San Juan is calculated from the CAPE index and lightning potential. Active storm cells and severe weather warnings are visible on the radar map in real time. Thunderstorm warnings are issued automatically as soon as storm cells are detected near San Juan.
What is the climate like in San Juan?
San Juan has an annual average high of 29.6°C. The warmest month is August (avg high 31.1°C), the coldest February (avg low 23.4°C). The wettest month is September with 150 mm, the driest March with 31 mm. Total annual precipitation is 934 mm (181 rainy days). Annual sunshine is 3945 hours.
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