Climate averages 1991–2020
San Juan weather
in April.
A hot, moderately wet month: the 7th warmest and the 6th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
April is a hot month in San Juan: daytime highs average 30.0°C and nights cool to about 22.3°C. By daytime temperature it is the 7th warmest of the 12 months.
Expect about 72 mm of rain on roughly 11 days, which makes April a moderately wet month (the 6th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 33 min on an average April day.
The nearest other city in this atlas is Bayamón (9 km away). In April its highs average 29.9°C, about as warm as San Juan, with 70 mm of rain.
Among the 7 cities listed in Puerto Rico, San Juan ranks 1st of 7 for the warmest April highs and joint 4th of 7 for the driest April (rainfall, lowest first). The mean April high of those 7 cities is 29.5°C; San Juan is 0.5°C warmer than that mean.
From April to May, average highs rise by 0.4°C to 30.4°C, and monthly rainfall rises from 72 mm to 112 mm.
The annual picture
April in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
San Juan climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 28.0°C21.5°C | 21.5°C | 39 | 10.4 | 11.211 h |
| February | 28.6°C21.3°C | 21.3°C | 29 | 7.7 | 11.512 h |
| March | 29.3°C21.5°C | 21.5°C | 39 | 8.4 | 12.012 h |
| April, selected | 30.0°C22.3°C | 22.3°C | 72 | 11.0 | 12.613 h |
| May | 30.4°C23.4°C | 23.4°C | 112 | 16.1 | 13.013 h |
| June | 31.3°C24.3°C | 24.3°C | 68 | 13.8 | 13.213 h |
| July | 31.5°C24.6°C | 24.6°C | 80 | 16.4 | 13.113 h |
| August | 31.5°C24.7°C | 24.7°C | 95 | 18.7 | 12.813 h |
| September | 31.2°C24.5°C | 24.5°C | 131 | 20.8 | 12.312 h |
| October | 30.4°C24.1°C | 24.1°C | 124 | 20.5 | 11.712 h |
| November | 28.9°C23.2°C | 23.2°C | 112 | 18.2 | 11.311 h |
| December | 28.1°C22.1°C | 22.1°C | 48 | 12.2 | 11.011 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
April in nearby cities
- Bayamón in AprilPuerto Rico · 9 kmHigh 29.9°C · Low 22.4°C · 70 mm rain
- Carolina in AprilPuerto Rico · 18 kmHigh 29.6°C · Low 22.5°C · 72 mm rain
- Caguas in AprilPuerto Rico · 27 kmHigh 28.9°C · Low 22.4°C · 86 mm rain
- Arecibo in AprilPuerto Rico · 64 kmHigh 29.9°C · Low 22.2°C · 107 mm rain
- Ponce in AprilPuerto Rico · 75 kmHigh 28.8°C · Low 22.5°C · 54 mm rain
- Mayagüez in AprilPuerto Rico · 113 kmHigh 29.3°C · Low 23.5°C · 36 mm rain
- Punta Cana in AprilDominican Republic · 243 kmHigh 27.0°C · Low 24.1°C · 51 mm rain
- Salvaleón de Higüey in AprilDominican Republic · 275 kmHigh 28.8°C · Low 22.2°C · 49 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for San Juan) is explained once on the San Juan year overview and on the Sources, method and limits page.
Carolina lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.