Puerto Rico
San Juan in May: weather, sea & travel advice
This month's data profile
Rain shapes the decision
San Juan in May is climatically well suited to beach holidays. The average daily high is around 29 °C, and the sea is about 27 °C. With about 23 rainy days it is very wet.
Historical monthly averages, not a weather forecast. Individual days and years can differ substantially.
Rank among 12 monthly averages
59/100 · #6
Warmth
#6
Dryness
#7
Sun
#5
Sea warmth
#8
Published best categories: none
San Juan · MayPhoto: Ktorrespr · CC BY-SA 4.0Climate facts
- Average high
- 29 °C
- Average low
- 25 °C
- Sea
- 27 °C
- Rainy days (est.)
- 23 rainy days (est.)
- Sun (est.)
- 7 h/day
- Humidity
- 78 %
Climate evidence with direct month comparison
The highlighted row is the selected month. Precipitation total and rainy days are separate monthly averages.
| Month | Avg high °C | Avg low °C | Rainy days (est.) | Precipitation mm | Sun h/day (est.) | Humidity % | Wind m/s | Sea °C | Score |
|---|---|---|---|---|---|---|---|---|---|
| April | 29 | 24 | 18 | 92 | 7.5 | 75 | 3.9 | 27 | 65 |
| May (selected) | 29 | 25 | 23 | 139 | 7.2 | 78 | 3.8 | 27 | 59 |
| June | 30 | 26 | 23 | 98 | 7.4 | 79 | 4.1 | 28 | 56 |
How do the previous and next months compare?
Baseline: May (59/100)
Positive and negative values show the change from the selected month.
| Score Δ | Average high Δ | Average low Δ | Rainy days Δ | Rain Δ | Sun Δ | Humidity Δ | Wind Δ | Sea Δ | |
|---|---|---|---|---|---|---|---|---|---|
| April | +6 | -0.4 °C | -1 °C | -5 | -46.4 mm | +0.3 h | -3 % | +0.1 m/s | -0.7 °C |
| June | -3 | +0.4 °C | +0.8 °C | +0.2 | -41.1 mm | +0.2 h | +1.1 % | +0.3 m/s | +0.7 °C |
All twelve months in context
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Where to stay in San Juan
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Useful next decisions
Frequently asked questions
How warm is San Juan in May?
The average daily high is around 29 °C, with an average daily low of about 25 °C.
Can you swim in San Juan in May?
The sea is about 27 °C (very warm).
Does it rain a lot in San Juan in May?
The curated estimate is about 23 rainy days per month, not a directly measured long-term average. Total precipitation averages around 139 mm for the month. A rainy day does not mean all-day rain.
When is the best time to visit San Juan?
By the climate score, January, February, March and April are the strongest months for San Juan. For a beach trip: January, February, March and April. May is not among them.