Weather in San Juan in January 2025
- January is usually the coldest month of the year in San Juan;
Average weather
Average temperature in San Juan in January
The temperature in January is +28°C on average, with a range between a maximum of +29°C during the day and a minimum of +21°C at night.
The average maximum temperature goes down 12% by the end of the month, compared with the beginning of the month, from +28°C to +27°C.
Is San Juan warm or cold in January?
San Juan is typically warm in January.
Maximum temperatures go up compared to the previous month from +28°C to +28°C. The minimum temperature also goes up from +23°C to +23°C.
It’s generally warm, but pack a long-sleeve shirt for evenings.
January is the coldest month in San Juan, here is the comparison with other months:
Water temperature in San Juan in January
Water in San Juan in January is Warm. It varies from +25°C to +27°C, with an average of +26°C. This is almost similar to the air temperature, which averages +28°C.
The water temperature in January is one of the coldest of the entire year:
Can you swim in San Juan in January?
Climate in San Juan in January
| December | January | February | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +28°C | +28°C | +28°C | ||||
| Min. temperature | ||||||
| +20°C | +19°C | +19°C | ||||
| Max. temperature | ||||||
| +34°C | +31°C | +32°C | ||||
| Rainfall | ||||||
| 48 mm | 38 mm | 38 mm | ||||
| Wind | ||||||
| 2 m/s | 3 m/s | 3 m/s | ||||
| Avg. water temperature | ||||||
| +28°C | +26°C | +26°C | ||||
| Humidity | ||||||
| 78% | 77% | 75% | ||||
| Air pressure | ||||||
| 1015 HPa | 1016 HPa | 1016 HPa | ||||
| Sunny days | ||||||
| 2 | 2 | 2 | ||||
| Cloudy days | ||||||
| 7 | 8 | 7 | ||||
| Rainy days | ||||||
| 21 | 21 | 19 | ||||
| Snowy days | ||||||
| 0 | 0 | 0 | ||||
January weather is still as good as in December. The temperature levels stay the same in the area of +28°C for average maximum temperature during the day. As January arrives, the amount of rainfall goes down. On average, the rainfall volume decreases from 48 mm to 38 mm. It feels drier, as humidity decreases from 78% to 77%. Winds are stronger in comparison to December, going up from 2 m/s to 3 m/s on average. The amount of sunny days stay about the same, averaging 2 sunny days during the month.
February brings much the same weather, it remains good.
Wind
The average wind speed is 4 m/s getting up to 6 m/s which is a medium breeze. You can feel it, especially getting out of the water.
The average wind speed in San Juan is gradually increasing during January, going from 3 m/s to 6 m/s over the course of the month.
Rain
How was the weather last January in San Juan?
Climate Change over Years
The climate in San Juan in January has not changed much over the last 43 years.
The average temperature was the lowest in 2008 (+29°C) and the highest in 2013 (+31°C). The driest year was 1994 with only 675 mm of rainfall, and the wettest year was 2023 with 2338 mm.
FAQ
Is January a good time to visit San Juan?
Can you sunbathe in San Juan in January?
Can you swim in San Juan in January?
Is San Juan rainy in January?
Is it sunny in San Juan in January?
Monthly weather in San Juan
Source of the data
For this page, we’ve looked at the typical weather in San Juan, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.