January weather forecast
San José, Costa Rica

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Skyscape of San José, Costa Rica in the evening sun
Skyscape of San José, Costa Rica in the evening sun

Weather in January

As the year kicks off in San José, Costa Rica, balmy temperatures and moderate rainfall set the stage for a tropical climate. January marks a slight increase in temperatures, higher edges reaching 23.9°C (75°F), from the cooler previous month. The city also experiences a decrease in rainfall, making it a favourable month for outdoor activities. The weather, characteristic for this month, remains consistently enjoyable, enticing tourists and locals to get out and explore.

Temperature

Entering January, San José's average high-temperature reads a still moderately hot 23.9°C (75°F), indicating a close resemblance to the previous month's climate. January nights cool down to an average low-temperature of 13.8°C (56.8°F).

Humidity

In January, the average relative humidity is 78%.

Rainfall

In January, in San José, the rain falls for 14.3 days. Throughout January, 32mm (1.26") of precipitation is accumulated. Throughout the year, in San José, Costa Rica, there are 287.8 rainfall days, and 2585mm (101.77") of precipitation is accumulated.

Daylight

In San José, the average length of the day in January 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

In San José, Costa Rica, the average sunshine in January is 8.9h.

UV index

January through December, with an average maximum UV index of 5, are months with the highest UV index. The months with the lowest UV index in San José are January through December, with an average maximum UV index of 5. A UV Index estimate of 3 to 5 represents a moderate health risk from exposure to the Sun's UV rays for the average person.
Note: In January, the average maximum UV index of 5 translates into the following recommendations:
Heed the precautions - It is counselled to guard against solar damage. Sun exposure should be minimized, especially during midday, to avoid harmful UV radiation. Fend off the sun's harsh rays with appropriate clothing, a wide-brim hat, and UV-protective sunglasses.

Frequently asked questions

What is the usual temperature for San José in January?

The average high-temperature, in January, in San José, is 23.9°C (75°F), while the average low-temperature is 13.8°C (56.8°F).

What is the average humidity in January in San José?

The average relative humidity in January in San José, Costa Rica, is 78%.

How much does it rain in San José in January?

In San José, Costa Rica, during January, the rain falls for 14.3 days and regularly aggregates up to 32mm (1.26") of precipitation.

How many hours of daylight does San José have in January?

In January, the average day length in San José, Costa Rica, is 11h and 37min.

When are sunrise and sunset in January in San José?

In January, on the first day of the month, sunrise is at 05:53 and sunset at 17:26. On the last day of the month, sunrise is at 05:58 and sunset at 17:40 CST.

How long on average sun shines in January in San José?

In January, the average sunshine duration is 8.9h.

What is the month with the highest UV index in San José?

January through December, with an average maximum UV index of 5, are months with the highest UV index.

What is the month with the lowest UV index in San José?

The months with the lowest UV index in San José, Costa Rica, are January through December, with an average maximum UV index of 5.

How high is the UV index in January in San José?

In San José, the average daily maximum UV index in January is 5. A UV Index value of 3 to 5 symbolizes a moderate vulnerability from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in January
San José, Costa Rica

Average temperature in January - San José, 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 José, Costa Rica

Average pressure in January - San José, 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 José, Costa Rica

Average wind speed in January - San José, 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 José, Costa Rica

Average humidity in January - San José, 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 José, Costa Rica

Average rainfall in January - San José, 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 José, Costa Rica

Average rainfall days in January - San José, 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 José, Costa Rica

Average daylight in January / Average sunshine in January - San José, 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 José, Costa Rica

Average sunshine days in January - San José, 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 José, Costa Rica

Average UV index in January - San José, 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 José, Costa Rica

Average cloud cover in January - San José, 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 José, Costa Rica

Average visibility in January - San José, 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 José, Costa Rica

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