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 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
The average high-temperature during January is a still moderately hot 23.9°C (75°F), almost matching the conditions of the preceding month. During the month of January, an average low-temperature of 13.8°C (56.8°F) is recorded.Humidity
In January, the average relative humidity in San Juan is 78%.Rainfall
In San Juan, during January, the rain falls for 14.3 days and regularly aggregates up to 32mm (1.26") of precipitation. Throughout the year, there are 287.8 rainfall days, and 2585mm (101.77") of precipitation is accumulated.Daylight
In January, the average length of the day in San Juan is 11h and 37min.On the first day of the month, sunrise is at 05:53 and sunset at 17:26. On the last day of January, sunrise is at 05:58 and sunset at 17:40 CST.
Sunshine
The average sunshine in January is 8.9h.UV index
The months with the highest UV index are January through December, with an average maximum UV index of 5. The months with the lowest UV index are January through December, with an average maximum UV index of 5. A UV Index of 3 to 5 symbolizes a moderate threat to health from unprotected exposure to Sun's UV rays for ordinary individuals.Note: In January, the maximum UV index of 5 translates into these guidelines:
Undertake precautions - Guarding against sun damage is counselled. When the Sun's UV radiation is most intense during midday, it's best to find shade and limit exposure. Always opt for UVA and UVB-resistant sunglasses on radiant days.
Frequently asked questions
What are January temperatures in San Juan?
What is the average humidity in January in San Juan?
How much does it rain in San Juan in January?
What is the average length of the day in January in San Juan?
What time are sunrise and sunset in January in San Juan?
How many hours of sunshine does San Juan have in January?
What is the month with the highest UV index in San Juan?
What are the months with the lowest UV index in San Juan?
What is the UV index intensity in January in San Juan?
Average temperature in January
San Juan, Costa Rica
- Average high temperature in January: 23.9°C
The warmest month (with the highest average high temperature) is April (26°C).
The month with the lowest average high temperature is October (22.4°C).
- Average low temperature in January: 13.8°C
The month with the highest average low temperature is June (17°C).
The coldest month (with the lowest average low temperature) is January (13.8°C).
Average pressure in January
San Juan, Costa Rica
- Average pressure in January: 1012.3mbar
The month with the highest atmospheric pressure is January (1012.3mbar).
The month with the lowest atmospheric pressure is October (1010.8mbar).
Average wind speed in January
San Juan, Costa Rica
- Average wind speed in January: 10.5km/h
The windiest month (with the highest average wind speed) is February (10.7km/h).
The calmest month (with the lowest average wind speed) is September (4.3km/h).
Average humidity in January
San Juan, Costa Rica
- Average humidity in January: 78%
The months with the highest relative humidity are September and October (91%).
The months with the lowest relative humidity are February and March (75%).
Average rainfall in January
San Juan, Costa Rica
- Average rainfall in January: 32mm
The wettest month (with the highest rainfall) is October (438mm).
The driest month (with the least rainfall) is February (26mm).
Average rainfall days in January
San Juan, Costa Rica
- Average rainfall days in January: 14.3 days
The month with the highest number of rainy days is October (30.5 days).
The month with the least rainy days is February (12.2 days).
Average daylight in January /
Average sunshine in January
San Juan, Costa Rica
- Average daylight in January: 11h and 4min
The month with the longest days is June (Average daylight: 12h and 42min).
The month with the shortest days is December (Average daylight: 11h and 36min).
- Average sunshine in January: 8h and 5min
The month with the most sunshine is February (Average sunshine: 9h and 12min).
The month with the least sunshine is October (Average sunshine: 5h and 48min).
Average sunshine days in January
San Juan, Costa Rica
- Average sunshine days in January: 13.1 days
The month with the most sunshine days is March (13.5 days).
The month with the least sunshine days is September (0.1 days).
Average UV index in January
San Juan, Costa Rica
- Average UV index in January: 5
The months with the highest UV index are January, February, March, April, May, June, July, August, September, October, November and December (UV index 5).
The months with the lowest UV index are January, February, March, April, May, June, July, August, September, October, November and December (UV index 5).
Average cloud cover in January
San Juan, Costa Rica
- Average cloud cover in January: 33
The month with the most cloud cover is October (Cloud cover 68).
The month with the least cloud cover is February (Cloud cover 30).
Average visibility in January
San Juan, Costa Rica
- Average visibility in January: 9km
The months with the highest visibility are January, February and March (9km).
The months with the lowest visibility are August, September, October and November (6km).
San Juan, Costa Rica
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