San JuanPhoto: Ktorrespr · CC BY-SA 4.0Puerto Rico · North America
Best time to visit San Juan
San Juan pairs the colourful colonial old town of Old San Juan and the mighty El Morro fort with Caribbean beaches. Warm all year, a little wetter in late summer.
Climate decision
Best travel months for San Juan
Top recommendation
Next highest scores
Historical monthly averages, not a weather forecast. Individual days and years can differ substantially.
Latest 5-year values 2021–2025
Average of the five most recent complete years compared with the 1991–2025 climate average.
March · Wet days
11.2 days/month
1991–2025: 16.7 days/month
-5.5 days/month · lower
October · Mean daily maximum
30.5 °C
1991–2025: 29.5 °C
+1.1 °C · higher
March · Monthly precipitation
47.7 mm/month
1991–2025: 74.3 mm/month
-26.6 mm/month · lower
March · Sunshine per day
7.6 h/day
1991–2025: 6.9 h/day
+0.7 h/day · higher
October · Sea temperature
29.7 °C
1991–2025: 29 °C
+0.6 °C · higher
October: 99/155 days at or above 30 °C; highest single value 33.4 °C.
Five-year historical sample, not a weather forecast or long-term climate trend. Individual hot days can be far above the monthly mean.
Annual profile · Rainfall rhythm
San Juan: rainfall separates the travel months
The driest and wettest months are 11.8 rainy days apart. Average daily highs vary by 2.9 °C, so both signals matter when choosing a month.
What matters
A warmer month is not automatically the most reliable. Read the drier windows alongside sunshine, sea temperature and the activity you have in mind.
Fewest rainy days
February · 15.5
Most rainy days
September · 27.3
Most sunshine
April · 7.5 h
Warmest sea
September · 29 °C
Month by month
Overall suitability per month. Tap a month for details.
All climate figures compared
The table is the complete accessible data view; the charts below highlight selected patterns.
| Month | Avg high °C | Avg low °C | Rainy days (est.) | Rain mm | Sun h/day (est.) | Humidity % | Wind m/s | Sea °C | Score |
|---|---|---|---|---|---|---|---|---|---|
| January | 27 | 23 | 17 | 69 | 5.4 | 77 | 4.1 | 27 | 68 |
| February | 28 | 23 | 15 | 62 | 6.2 | 75 | 4.2 | 26 | 71 |
| March | 28 | 23 | 17 | 74 | 6.9 | 74 | 4.0 | 26 | 69 |
| April | 29 | 24 | 18 | 92 | 7.5 | 75 | 3.9 | 27 | 65 |
| May | 29 | 25 | 23 | 139 | 7.2 | 78 | 3.8 | 27 | 59 |
| June | 30 | 26 | 23 | 98 | 7.4 | 79 | 4.1 | 28 | 56 |
| July | 30 | 26 | 25 | 112 | 7.4 | 79 | 4.4 | 28 | 55 |
| August | 30 | 26 | 27 | 138 | 7.3 | 79 | 4.1 | 29 | 53 |
| September | 30 | 27 | 27 | 178 | 6.8 | 80 | 3.5 | 29 | 52 |
| October | 29 | 26 | 26 | 171 | 6.1 | 80 | 3.3 | 29 | 54 |
| November | 28 | 25 | 23 | 155 | 5.4 | 81 | 3.7 | 28 | 58 |
| December | 28 | 24 | 19 | 82 | 5.1 | 79 | 4.1 | 27 | 64 |
Climate through the year
Compare temperature, rainy days, sunshine and, for coastal destinations, sea temperature month by month.
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Where to stay in San Juan
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The number is the overall climate score, not a similarity score.
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Frequently asked questions
When is the best time to visit San Juan?
The strongest climate months are January, February, March, April. Values are historical averages, not a forecast.
Which month has the highest average daily maximum temperature in San Juan?
Average daily maximum temperatures in San Juan are practically tied in July, August and September at around 30 °C.
When is the sea warmest at San Juan?
In September, at around 29 °C.