January Weather in San Isidro, Costa Rica

Last updated: August 23, 2025

In January, the average temperature in San Isidro, Costa Rica hovers around 22°C (72°F), with a comfortable minimum of 18°C (65°F) and a pleasant maximum of 25°C (78°F). However, be prepared for some rain, as 194 mm (7.6 in) of precipitation is expected over 21 days. Don't forget to account for the average humidity of 68%, which adds a touch of warmth to the air.

January Temperature in San Isidro

In January in San Isidro, the average temperature is 22°C (72°F), with a maximum reaching 25°C (78°F) and a minimum as low as 18°C (65°F). This mild climate makes San Isidro an ideal destination for travelers looking to enjoy outdoor activities and explore the local attractions.

January Weather in San Isidro: Daily Temperature Highs, Lows, and Averages

The chart illustrates January temperature patterns in San Isidro, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In San Isidro, January typically has an average temperature of 22°C (72°F), with highs reaching up to 25°C (78°F) and lows dropping to around 18°C (65°F).

Data source: Temperature data for San Isidro generated using information from the Copernicus Climate Change Service.

January Precipitation in San Isidro

In San Isidro in January, the precipitation amount is 194 mm (7.6 in) spread over 21 days.

January Precipitation Trends in San Isidro

The chart displays monthly precipitation patterns in San Isidro, with values for each month alongside January’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how January’s conditions compare to those of other months. In San Isidro, January typically receives around 194 mm (7.6 inches) of precipitation spread over approximately 21 days.

Data source: Precipitation data for January generated using information from the Copernicus Climate Change Service.

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

January Humidity in San Isidro

In San Isidro in January humidity is 68%. With an average temperature of 22°C (72°F), this humidity feels like a warm embrace, slightly stifling but still manageable for traveling, creating an atmosphere that encourages leisurely outdoor activities while prompting occasional breaks for refreshment.

January Average Humidity in San Isidro

This chart illustrates the average monthly humidity levels in San Isidro, with January’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In January, average humidity in San Isidro is approximately 68%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for January generated using information from the Copernicus Climate Change Service.

January UV Index in San Isidro

In San Isidro in January, the maximum UV index is 12, which corresponds to an extreme Exposure Category. The time to burn is just 10 minutes, underscoring the importance of sun protection. For detailed information, you can check the Hourly UV Index in San Isidro.

Maximum UV Index Levels in San Isidro for January

The chart shows the monthly maximum UV Index (UVI) for San Isidro in January, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In January, the maximum UV index in San Isidro typically reaches 12, which falls under the extreme exposure category.

Data source: San Isidro January UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

Extreme (11+): Avoid the sun, stay in shade.
Very High (8-10): Limit sun exposure.
High (6-7): Use SPF 30+ and protective clothing.
Moderate (3-5): Midday shade recommended.
Low (0-2): No protection needed.

How January Weather in San Isidro Compares to Other Months

Weather in San Isidro varies notably across the year, with each month offering distinct climate conditions. This page compares January’s weather to other months in San Isidro, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in San Isidro, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	22°C (72°F)	194 mm (7.6 inches)	68%	extreme
February Weather	22°C (73°F)	99 mm (3.9 inches)	68%	extreme
March Weather	23°C (73°F)	120 mm (4.7 inches)	66%	extreme
April Weather	23°C (73°F)	350 mm (13.8 inches)	67%	extreme
May Weather	23°C (73°F)	742 mm (29.2 inches)	69%	extreme
June Weather	23°C (73°F)	663 mm (26.1 inches)	84%	extreme
July Weather	22°C (73°F)	784 mm (30.8 inches)	85%	extreme
August Weather	22°C (73°F)	838 mm (33.0 inches)	82%	extreme
September Weather	22°C (72°F)	766 mm (30.1 inches)	81%	extreme
October Weather	22°C (72°F)	937 mm (36.9 inches)	80%	extreme
November Weather	22°C (72°F)	885 mm (34.8 inches)	80%	extreme
December Weather	22°C (72°F)	354 mm (13.9 inches)	72%	extreme