Rainy Season in Puerto Rico: Month by Month
Quick answer: Puerto Rico does not really have a dry season — it has a drier half. San Juan’s wet months are May, Jul–Nov, peaking in October at 166 mm (6.5 in), and even February, its driest, still brings 11 rain days. What changes through the year is how much falls, not whether it falls.
Pick a destination to see its weather month by month and the best time to go, or pick a month to see where the weather is at its best.
Tokyo · a city trip
Good: Mar–May, Oct–DecNo month is ideal for a city trip by our rule, but these come close.
- Warmest
- Aug · 89°F
- Coolest
- Jan · 49°F
- Wettest
- Jul · 16 rain days
- Averages for 2006–2025: any single year can be hotter, colder or wetter.
Weather from NASA POWER daily data, 2006–2025, for the ~50 km area around each place. Right on the coast, afternoons can be a few degrees warmer than shown.
| Month | High / low (°F) | Rain days | Rain (in) | Storms within 100 mi | Verdict |
|---|---|---|---|---|---|
| Jan | 49° / 34° | 5 | 2.4 | Off (too cold) | |
| Feb | 51° / 35° | 7 | 3.1 | Off (too cold) | |
| Mar | 57° / 40° | 12 | 5.1 | Good (cool, showery) | |
| Apr | 65° / 48° | 12 | 6 | Good (showery) | |
| May | 73° / 58° | 13 | 6.6 | Good (showery) | |
| Jun | 79° / 65° | 16 | 8.1 | Off (too wet) | |
| Jul | 86° / 73° | 16 | 6.5 | Off (too wet) | |
| Aug | 89° / 75° | 15 | 5.4 | Off (too hot) | |
| Sep | 82° / 70° | 16 | 8.7 | Off (too wet) | |
| Oct | 72° / 59° | 14 | 8.9 | Good (showery) | |
| Nov | 63° / 48° | 11 | 4.4 | Good (showery) | |
| Dec | 54° / 39° | 7 | 3.2 | Good (cool) |
The tool above opens on San Juan: change the place or the month to yours. Below, Puerto Rico month by month — rain, rain days and how warm it is.
Puerto Rico month by month
Average rainfall and the number of days with at least 1 mm of rain, 2006–2025. On this page a month counts as wet when it gets more rain than an average month in that place (more than a twelfth of its year), and dry when it gets less than half an average month. The months in between are the shoulder.
| Month | Rain | Rain days | Average high | |
|---|---|---|---|---|
| January | 41 mm (1.6 in) | 12 | 82°F / 28°C | Dry |
| February | 38 mm (1.5 in) | 11 | 83°F / 28°C | Dry |
| March | 52 mm (2.0 in) | 12 | 83°F / 29°C | Shoulder |
| April | 72 mm (2.8 in) | 15 | 85°F / 29°C | Shoulder |
| May | 117 mm (4.6 in) | 21 | 85°F / 30°C | Wet |
| June | 87 mm (3.4 in) | 21 | 86°F / 30°C | Shoulder |
| July | 97 mm (3.8 in) | 23 | 87°F / 30°C | Wet |
| August | 128 mm (5.0 in) | 26 | 87°F / 31°C | Wet |
| September | 155 mm (6.1 in) | 26 | 87°F / 31°C | Wet |
| October | 166 mm (6.5 in) | 23 | 86°F / 30°C | Wet |
| November | 141 mm (5.6 in) | 21 | 84°F / 29°C | Wet |
| December | 55 mm (2.2 in) | 15 | 82°F / 28°C | Shoulder |
San Juan is wet in May, Jul–Nov, shoulder in Mar–Apr, Jun, Dec and dry in Jan–Feb.
There is a lull in early summer. June averages 87 mm (3.4 in) against 117 mm (4.6 in) in May and 97 mm (3.8 in) in July — small, but it is why June often feels drier than its place in the calendar suggests. The heavy stretch is August to November, which is also the storm season.
The wettest and driest months
San Juan: wettest in October (166 mm (6.5 in), 23 rain days), driest in February (38 mm (1.5 in), 11 rain days). Over the year, San Juan gets 1149 mm (45.2 in).
Does the rainy season mean storms?
Not by itself — but San Juan is on the hurricane map, and the two overlap here. In the 50 seasons to 2025 a tropical storm or hurricane passed within 100 miles of it in 10 of them in August, its busiest month — which is to say that in the other 40, that month was rain and nothing else. Rain is what most of a wet season is: for the storms themselves, see hurricane season in Puerto Rico and every storm since 1976.
The best months to go
San Juan: Dec–Apr. When to Go rates every month on temperature, rain days and storms — open San Juan in the tool above and step through the year.
Plan it
- Things to do in San Juan
- What not to miss in Puerto Rico
- Puerto Rico’s number one attraction
- San Juan’s weather, month by month
- Where to travel this month
- Hurricane season in Puerto Rico
FAQ
When is the rainy season in Puerto Rico?
May, Jul–Nov — the months that get more rain than an average month in San Juan. October is the wettest, at 166 mm (6.5 in) across 23 rain days, against 38 mm (1.5 in) in February (NASA POWER, 2006–2025).
Does it rain all day in the rainy season in Puerto Rico?
The measure here is a day with at least 1 mm of rain, not a day of rain. In October, San Juan averages 23 rain days out of 31, with an average high of 86°F / 30°C.
What is the driest month in Puerto Rico?
February, at 38 mm (1.5 in) across 11 rain days. The dry months, by the rule this page uses, are Jan–Feb.
When is the best time to visit Puerto Rico?
When to Go rates Dec–Apr the best of the year here for San Juan, on temperature, rain days and — where it applies — storms. Change the place in the tool above for anywhere else on the same map.
How these numbers are made
Daily rainfall and temperature from NASA POWER (MERRA-2), averaged over 2006–2025; a rain day is a day with at least 1 mm. POWER works on a grid of about 50 km, so each place here is its neighbourhood rather than its own rain gauge: a coast, a small island or a valley under a mountain can differ from the square it sits in. The months are the part that holds; treat a single millimetre figure as an average, not a forecast. Storm counts are from NOAA’s best tracks (HURDAT2), 1976–2025.