Climate averages 1991–2020
San Juan weather
in October.
A hot, wet month: the joint 5th warmest and the 11th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
October is a hot month in San Juan: daytime highs average 30.4°C and nights cool to about 24.1°C. By daytime temperature it is the joint 5th warmest of the 12 months.
Expect about 124 mm of rain on roughly 21 days, which makes October a wet month (the 11th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 11 h 44 min on an average October day.
The nearest other city in this atlas is Bayamón (9 km away). In October its highs average 30.3°C, about as warm as San Juan, with 113 mm of rain.
Among the 7 cities listed in Puerto Rico, San Juan ranks joint 1st of 7 for the warmest October highs and joint 4th of 7 for the driest October (rainfall, lowest first). The mean October high of those 7 cities is 29.9°C; San Juan is 0.4°C warmer than that mean.
From October to November, average highs fall by 1.5°C to 28.9°C, and monthly rainfall falls from 124 mm to 112 mm.
The annual picture
October 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 | 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, selected | 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
October in nearby cities
- Bayamón in OctoberPuerto Rico · 9 kmHigh 30.3°C · Low 24.1°C · 113 mm rain
- Carolina in OctoberPuerto Rico · 18 kmHigh 30.2°C · Low 24.2°C · 124 mm rain
- Caguas in OctoberPuerto Rico · 27 kmHigh 29.5°C · Low 24.2°C · 156 mm rain
- Arecibo in OctoberPuerto Rico · 64 kmHigh 30.4°C · Low 24.0°C · 138 mm rain
- Ponce in OctoberPuerto Rico · 75 kmHigh 29.0°C · Low 24.0°C · 105 mm rain
- Mayagüez in OctoberPuerto Rico · 113 kmHigh 29.9°C · Low 25.2°C · 71 mm rain
- Punta Cana in OctoberDominican Republic · 243 kmHigh 28.3°C · Low 25.6°C · 117 mm rain
- Salvaleón de Higüey in OctoberDominican Republic · 275 kmHigh 29.4°C · Low 23.7°C · 107 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.