Puerto Rico
San Juan in January: weather, sea & travel advice
This month's data profile
Rain shapes the decision
San Juan in January is climatically well suited to beach holidays and family holidays. The average daily high is around 27 °C, and the sea is about 27 °C. With about 17 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
68/100 · #3
Warmth
#12
Dryness
#3
Sun
#10
Sea warmth
#10
Published best categories: Overall, Beach, City break, Family
San Juan · JanuaryPhoto: Ktorrespr · CC BY-SA 4.0Climate facts
- Average high
- 27 °C
- Average low
- 23 °C
- Sea
- 27 °C
- Rainy days (est.)
- 17 rainy days (est.)
- Sun (est.)
- 5 h/day
- Humidity
- 77 %
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 |
|---|---|---|---|---|---|---|---|---|---|
| December | 28 | 24 | 19 | 82 | 5.1 | 79 | 4.1 | 27 | 64 |
| January (selected) | 27 | 23 | 17 | 69 | 5.4 | 77 | 4.1 | 27 | 68 |
| February | 28 | 23 | 15 | 62 | 6.2 | 75 | 4.2 | 26 | 71 |
How do the previous and next months compare?
Baseline: January (68/100)
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 | |
|---|---|---|---|---|---|---|---|---|---|
| December | -4 | +0.2 °C | +0.8 °C | +1.8 | +12.7 mm | -0.3 h | +1.6 % | -0.1 m/s | +0.8 °C |
| February | +3 | +0.3 °C | -0.2 °C | -1.4 | -7.2 mm | +0.8 h | -2 % | +0.1 m/s | -0.3 °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 January?
The average daily high is around 27 °C, with an average daily low of about 23 °C.
Can you swim in San Juan in January?
The sea is about 27 °C (warm).
Does it rain a lot in San Juan in January?
The curated estimate is about 17 rainy days per month, not a directly measured long-term average. Total precipitation averages around 69 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. January is one of them.