San Juan, Puerto Rico weather in January
Temperature, sea and sunshine in January: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in January
Good
Best time to visit: December – April
What is the weather like in San Juan, Puerto Rico in January?
In January, San Juan, Puerto Rico is hot: daytime highs average 28 °C, and even at night it stays warm at around 22 °C. The sea averages 26.6 °C – lovely and warm for swimming. The sun shines for around 9 hours a day. Rain is frequent, with about 10 rainy days and 39 mm in total. The air is often humid and muggy. All in all, January is a good month for a holiday in San Juan, Puerto Rico.
January compared
How the weather changes from December to February. Tap a month to open it.
| DecemberDec | JanuaryJan | FebruaryFeb | |
|---|---|---|---|
| Score | 73 | 79 | 79 |
| Day | 28° | 28° | 29° |
| Night | 22° | 22° | 22° |
| Sea | 27° | 27° | 26° |
| Sun | 9 h | 9 h | 9 h |
| Rain days | 12 | 10 | 9 |
More details for January
- Daylight
- 11 h 8 min06:59 – 18:07
- UV index
- 7 · highclear sky, noon (estimate)
- Muggy days
- 30 daysdew point 18 °C or more
- Wind
- 20 km/haverage daily peak
- Cloud cover
- 38 %on average
- Hot days
- 2 days30 °C or more
- Time zone
- UTC−4America/Puerto_Rico
How the score comes together
- Temperatureweight 50 %86 %
- Sunshineweight 20 %97 %
- Few rainy daysweight 30 %56 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in January
- Swimwear
- Sunscreen
- Sunglasses & sun hat
- Light, breathable clothes
- Insect repellent
- Rain jacket or umbrella
San Juan, Puerto Rico in January: quick answers
Is San Juan, Puerto Rico hot in January?
Yes. In January, San Juan, Puerto Rico is hot: daytime highs average 28 °C and nights stay around 22 °C. On about 2 days the thermometer climbs to 30 °C or more.
Can you swim in San Juan, Puerto Rico in January?
Yes. In January the sea averages 26.6 °C – lovely and warm for swimming.
Does it rain much in San Juan, Puerto Rico in January?
Rain is frequent, with about 10 rainy days and 39 mm in total.
San Juan, Puerto Rico month by month
The whole year in San Juan, Puerto RicoAll destinations: Puerto Rico
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, GeoNames (CC BY 4.0)