Climate averages 1991–2020
San Juan weather
in March.
A hot, fairly dry month: the 8th warmest and the joint 2nd driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
March is a hot month in San Juan: daytime highs average 29.3°C and nights cool to about 21.5°C. By daytime temperature it is the 8th warmest of the 12 months.
Expect about 39 mm of rain on roughly 8 days, which makes March a fairly dry month (the joint 2nd driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 02 min on an average March day.
The nearest other city in this atlas is Bayamón (9 km away). In March its highs average 29.3°C, about as warm as San Juan, with 40 mm of rain.
Among the 7 cities listed in Puerto Rico, San Juan ranks joint 2nd of 7 for the warmest March highs and joint 3rd of 7 for the driest March (rainfall, lowest first). The mean March high of those 7 cities is 29.0°C; San Juan is 0.3°C warmer than that mean.
From March to April, average highs rise by 0.7°C to 30.0°C, and monthly rainfall rises from 39 mm to 72 mm.
The annual picture
March 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, selected | 29.3°C21.5°C | 21.5°C | 39 | 8.4 | 12.012 h |
| April | 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
March in nearby cities
- Bayamón in MarchPuerto Rico · 9 kmHigh 29.3°C · Low 21.5°C · 40 mm rain
- Carolina in MarchPuerto Rico · 18 kmHigh 28.9°C · Low 21.7°C · 39 mm rain
- Caguas in MarchPuerto Rico · 27 kmHigh 28.2°C · Low 21.6°C · 55 mm rain
- Arecibo in MarchPuerto Rico · 64 kmHigh 29.6°C · Low 21.4°C · 59 mm rain
- Ponce in MarchPuerto Rico · 75 kmHigh 28.7°C · Low 21.8°C · 36 mm rain
- Mayagüez in MarchPuerto Rico · 113 kmHigh 29.0°C · Low 22.7°C · 28 mm rain
- Punta Cana in MarchDominican Republic · 243 kmHigh 26.3°C · Low 23.5°C · 36 mm rain
- Salvaleón de Higüey in MarchDominican Republic · 275 kmHigh 28.0°C · Low 21.4°C · 31 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.