Temperatures in January
It's warm in January in San Juan with an average temperature of 29°C. Temperatures this month range from a low of 29°C to a high of 30°C. At night, you can expect temperatures between 23°C and 24°C.
Max and Min Temperatures per Day
This chart shows the daily maximum and minimum temperatures in degrees Celsius for San Juan in January. The red line indicates the max temperatures, and the blue line shows the minimums.
Start of January
The month of January starts in San Juan with hot temperatures, averaging around 30°C during the day and nights close to 24°C. A few showers might pop up in the first days of the month, but the weather remains mostly sunny and dry. Breezy clothes like shorts or a dress, plus a hat and sunglasses, are ideal.
Mid-January
By mid-January, the average daytime temperature stays the same at 30°C, with nights close to 23°C. There might be a few showers during this period, but plenty of dry days with sunshine too.
End of January
By the end of January, the average daytime temperature in San Juan will be around 30°C, with nights close to 24°C. There’s regular precipitation, but with a bit of luck, you’ll also get some dry and sunny days. Breezy clothes like shorts or a dress, plus a hat and sunglasses, are ideal.
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Water temperature
The water temperature at San Juan is 27°C this month. Nice and warm for a swim.
Precipitation in January
In January, there is an average of 93 mm of precipitation, spread over 14 days. The wind speed is around 4 Bft, mostly coming from the East.
The average precipitation chance is 46% per day this month. Though it seems average, the weather’s variable. Some days have higher, others lower precipitation chances.
Precipitation Chance
This chart shows the daily precipitation chance (in percentages) in January for San Juan. 0% means it never rained on that day in the past 10 years, and 100% means it rained every day. All values in between represent the average chance of precipitation on that day.
San Juan in January |
London | ||
|---|---|---|---|
 Average Temperature |
29°C | 8°C | |
 High Temp |
30°C | 9°C | |
| Low Temp |
29°C | 6°C | |
 Total Precipitation |
93 mm | 58 mm | |
| Rainy Days |
14 days | 9 days | |
December
UV index
The UV index is a maximum of 7 this month. That's a moderate to high value on the intensity scale of 1 to 11. Unprotected skin can burn within 15-25 minutes.
Is January a good time to visit San Juan?
Want nice weather? Then January is a great time to be in San Juan. You’ll have pleasant temperatures and not too much rain this month.
Temperature records for San Juan in January
With 33°C, San Juan hit the highest temperature in the last 10 years in January 2017. The lowest daytime temperature in this month was 25°C in 2023. The extreme night temperatures ranged from a low of 17°C to a high of 25°C.
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Daily Temperature in January in San Juan
This chart shows the average daily temperatures, both day and night, for each day in January in San Juan, measured in degrees Celsius. The red line represents the maximum temperatures, while the blue line shows the minimums. The days of the month are displayed at the bottom of the chart. The data, based on historical observations, gives an overview of the average daily temperatures during this month.
Daily Precipitation in January in San Juan
The chart below shows the average daily precipitation in January for San Juan, measured in millimetres over the past years. Precipitation is always measured as water, even if it’s snow or hail. The days of the month are shown at the bottom of the chart.
A low average precipitation means that the chance of rain on that day is usually small, while a higher average suggests that rain is more likely. But it’s still an average, so each day can be different. Based on historical weather data for January, you can expect around 14 days of rain in San Juan.
Daily UV Index in January in San Juan
This chart shows the average daily UV index in January in San Juan, with the UV index ranging from 0 to a maximum of 11. The bottom of the chart shows the days of the month. Based on historical data, this chart provides an idea of the daily UV radiation levels you can expect.
Temperature in January in San Juan Over the Years
This chart shows the average temperature in January in San Juan, measured in degrees Celsius, over the past years.
Total Precipitation in January in San Juan Over the Years
This chart shows the average precipitation in January in San Juan, measured in millimetres over the past years. Precipitation is always measured as water, even if it’s snow or hail.
Daily climate in January for San Juan
Click on a specific day in January for detailed info on the typical weather on that day in San Juan. Check out the historical temperatures and precipitation over the past 10 years on this day.
Weather experiences in January in San Juan
Have you been to San Juan in January?
Share your weather experience in January in San Juan.
Average Weather in San Juan by Month
Click on a month below to see detailed weather info for San Juan. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.
