January Weather in Folsom, United States

Last updated: June 24, 2025

In January, the average temperature in Folsom, United States hovers around 3°C (37°F). Expect a chilly minimum of -18°C (0°F) and a pleasant maximum of 20°C (69°F). During this month, 62 mm (2.4 in) of precipitation typically falls over about 8 days, contributing to an average humidity of 83%. Be prepared for a cool and moist atmosphere!

January Temperature in Folsom

In January in Folsom, the average temperature is 3°C (37°F), with maximums reaching up to 20°C (69°F) and minimums dropping as low as -18°C (0°F). Be prepared for a wide range of temperatures, so pack layers for your trip!

January Weather in Folsom: Daily Temperature Highs, Lows, and Averages

The chart illustrates January temperature patterns in Folsom, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Folsom, January typically has an average temperature of 3°C (37°F), with highs reaching up to 20°C (69°F) and lows dropping to around -18°C (0°F).

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

January Precipitation in Folsom

In Folsom in January, the precipitation amount is 62 mm (2.4 in) over the course of 8 days.

January Precipitation Trends in Folsom

The chart displays monthly precipitation patterns in Folsom, 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 Folsom, January typically receives around 62 mm (2.4 inches) of precipitation spread over approximately 8 days.

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

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Millimeters (mm) Inches (in)

January Humidity in Folsom

In Folsom in January, humidity is 83%. With an average temperature of 3°C (37°F), this humidity feels like a damp chill that seeps into your bones, making outdoor activities less enjoyable and encouraging travelers to seek indoor attractions or cozy cafes.

January Average Humidity in Folsom

This chart illustrates the average monthly humidity levels in Folsom, 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 Folsom is approximately 83%, 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 Folsom

In Folsom in January, the maximum UV index is 3, which corresponds to a moderate Exposure Category. The time to burn is approximately 30 minutes. For more details on the hourly UV index in Folsom, you can check the information here.

Maximum UV Index Levels in Folsom for January

The chart shows the monthly maximum UV Index (UVI) for Folsom 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 Folsom typically reaches 3, which falls under the moderate exposure category.

Data source: Folsom 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 Folsom Compares to Other Months

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

This table compares monthly weather conditions in Folsom, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	3°C (37°F)	62 mm (2.4 inches)	83%	moderate
February Weather	5°C (41°F)	99 mm (3.9 inches)	82%	moderate
March Weather	7°C (45°F)	108 mm (4.2 inches)	81%	high
April Weather	13°C (55°F)	100 mm (4.0 inches)	79%	very high
May Weather	18°C (64°F)	119 mm (4.7 inches)	74%	very high
June Weather	23°C (74°F)	109 mm (4.3 inches)	77%	very high
July Weather	26°C (79°F)	135 mm (5.3 inches)	76%	very high
August Weather	25°C (77°F)	153 mm (6.0 inches)	77%	very high
September Weather	22°C (72°F)	110 mm (4.3 inches)	74%	very high
October Weather	17°C (62°F)	128 mm (5.0 inches)	75%	high
November Weather	9°C (48°F)	76 mm (3.0 inches)	80%	moderate
December Weather	5°C (41°F)	103 mm (4.1 inches)	81%	moderate