Contents
- Weather in January
- Frequently asked questions
- Average temperature in January
- Average pressure in January
- Average wind speed in January
- Average humidity in January
- Average rainfall in January
- Average rainfall days in January
- Average sea temperature in January
- Average daylight in January
- Average sunshine in January
- Average sunshine days in January
- Average UV index in January
- Average cloud cover in January
- Average visibility in January
Weather in January
Temperature
Temperatures reach their minimum during January and March, recording an average high-temperature of 79.9°F (26.6°C).Humidity
In San Juan, the average relative humidity in January is 77%.Rainfall
In January, the rain falls for 11.5 days. Throughout January, 0.83" (21mm) of precipitation is accumulated. In San Juan, Puerto Rico, during the entire year, the rain falls for 159.9 days and collects up to 12.01" (305mm) of precipitation.Ocean temperature
In San Juan, in January, the average water temperature is 79.7°F (26.5°C).Note: With water temperature from 77°F (25°C) to 84.2°F (29°C), all water activities are comfortable and delightful, devoid of discomfort even for lengthened periods.
Daylight
In January, the average length of the day is 11h and 10min.On the first day of the month, sunrise is at 6:56 am and sunset at 5:59 pm. On the last day of January, sunrise is at 6:58 am and sunset at 6:17 pm AST.
Sunshine
In San Juan, the average sunshine in January is 8.8h.UV index
January through March and December, with an average maximum UV index of 6, are months with the lowest UV index. A UV Index of 6 to 7 symbolizes a high threat to health from unsafe exposure to UV radiation for the ordinary person.Note: The maximum daily UV index of 6 in January interprets into the following recommendations:
Stay clear of intense sun exposure. Solar protection is of utmost significance. Remember that UV radiation from the Sun is strongest between 10 a.m. and 4 p.m. Make an effort to limit direct sun exposure during this time. In bright sunlight, prioritize sunglasses that grant protection from UVA and UVB radiation. Attention! UV radiation is markedly stronger with water and sand reflections.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What month is the coldest?
What is the average January temperature in San Juan?
What is the average humidity in January?
How many days does it rain in January?
How warm is the water in January?
How many hours of daylight does San Juan have in January?
When is the sunrise / sunset in January?
How many hours of sunshine does San Juan have in January?
What is the month with the lowest UV index?
What is the UV index reading in January?
Average temperature in January
San Juan, PR
- Average high temperature in January: 79.9°F
The warmest month (with the highest average high temperature) is August (85.1°F).
The months with the lowest average high temperature are January and March (79.9°F).
- Average low temperature in January: 74.7°F
The months with the highest average low temperature are August, September and October (79.2°F).
The coldest month (with the lowest average low temperature) is March (73.9°F).
Average pressure in January
San Juan, PR
- Average pressure in January: 30.02"Hg
The months with the highest atmospheric pressure are January and February (30.02"Hg).
The month with the lowest atmospheric pressure is October (29.9"Hg).
Average wind speed in January
San Juan, PR
- Average wind speed in January: 9.8mph
The windiest month (with the highest average wind speed) is July (10.7mph).
The calmest month (with the lowest average wind speed) is October (7.4mph).
Average humidity in January
San Juan, PR
- Average humidity in January: 77%
The months with the highest relative humidity are May, June and July (79%).
The months with the lowest relative humidity are February and March (76%).
Average rainfall in January
San Juan, PR
- Average rainfall in January: 0.83"
The wettest month (with the highest rainfall) is November (1.57").
The driest month (with the least rainfall) is April (0.55").
Average rainfall days in January
San Juan, PR
- Average rainfall days in January: 11.5 days
The month with the highest number of rainy days is November (16.1 days).
The month with the least rainy days is June (10.3 days).
Average sea temperature in January
San Juan, PR
- Average sea temperature in January: 79.7°F
The best month for swimming (with the highest average sea temperature) is September (84.9°F).
The coldest month (with the lowest average sea temperature) is February (78.9°F).
Average daylight in January /
Average sunshine in January
San Juan, PR
- Average daylight in January: 11h and 1min
The month with the longest days is June (Average daylight: 13h and 12min).
The month with the shortest days is December (Average daylight: 11h and 0min).
- Average sunshine in January: 8h and 5min
The month with the most sunshine is June (Average sunshine: 10h and 54min).
The month with the least sunshine is December (Average sunshine: 6h and 36min).
Average sunshine days in January
San Juan, PR
- Average sunshine days in January: 11.1 days
The month with the most sunshine days is June (13.7 days).
The month with the least sunshine days is November (9.4 days).
Average UV index in January
San Juan, PR
- Average UV index in January: 6
The months with the highest UV index are April, May, June, July, August, September, October and November (UV index 7).
The months with the lowest UV index are January, February, March and December (UV index 6).
Average cloud cover in January
San Juan, PR
- Average cloud cover in January: 32
The month with the most cloud cover is December (Cloud cover 35).
The month with the least cloud cover is September (Cloud cover 26).
Average visibility in January
San Juan, PR
- Average visibility in January: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
San Juan, Puerto Rico, USA
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