January Weather in Saint Johns, United States

Last updated: June 24, 2025

In January, the average temperature in Saint Johns, United States hovers around 2°C (36°F), with minimums dipping as low as -19°C (-2°F) and maximums reaching 18°C (65°F). Expect 25 mm (1.0 in) of precipitation over about 5 days, contributing to an average humidity of 81%.

January Temperature in Saint Johns

In January in Saint Johns, the average temperature is 2°C (36°F), with maximums reaching 18°C (65°F) and minimums plummeting to -19°C (-2°F). This varied climate makes it essential for travelers to prepare for both warm and chilly conditions.

January Weather in Saint Johns: Daily Temperature Highs, Lows, and Averages

The chart illustrates January temperature patterns in Saint Johns, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Saint Johns, January typically has an average temperature of 2°C (36°F), with highs reaching up to 18°C (65°F) and lows dropping to around -19°C (-2°F).

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

January Precipitation in Saint Johns

In Saint Johns in January, the total precipitation amount is 25 mm (1.0 in) over a span of 5 days.

January Precipitation Trends in Saint Johns

The chart displays monthly precipitation patterns in Saint Johns, 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 Saint Johns, January typically receives around 25 mm (1.0 inches) of precipitation spread over approximately 5 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 Saint Johns

In Saint Johns in January humidity is 81%. With an average temperature of 2°C (36°F), this humidity feels like a chilly dampness that seeps into your bones, making travel uncomfortable and necessitating extra layers to stay warm and dry.

January Average Humidity in Saint Johns

This chart illustrates the average monthly humidity levels in Saint Johns, 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 Saint Johns is approximately 81%, 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 Saint Johns

In Saint Johns in January, the maximum UV index reaches 5, which corresponds to a moderate Exposure Category. Under these conditions, the estimated time to burn is approximately 30 minutes. For more details, you can check the Hourly UV Index in Saint Johns.

Maximum UV Index Levels in Saint Johns for January

The chart shows the monthly maximum UV Index (UVI) for Saint Johns 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 Saint Johns typically reaches 5, which falls under the moderate exposure category.

Data source: Saint Johns 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 Saint Johns Compares to Other Months

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

This table compares monthly weather conditions in Saint Johns, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	2°C (36°F)	25 mm (1.0 inches)	81%	moderate
February Weather	4°C (40°F)	29 mm (1.1 inches)	83%	high
March Weather	9°C (48°F)	21 mm (0.8 inches)	71%	very high
April Weather	14°C (57°F)	13 mm (0.5 inches)	61%	extreme
May Weather	18°C (64°F)	9 mm (0.4 inches)	48%	extreme
June Weather	24°C (76°F)	6 mm (0.3 inches)	36%	extreme
July Weather	25°C (77°F)	32 mm (1.3 inches)	37%	extreme
August Weather	24°C (76°F)	19 mm (0.8 inches)	46%	extreme
September Weather	21°C (69°F)	19 mm (0.8 inches)	62%	extreme
October Weather	14°C (57°F)	17 mm (0.7 inches)	74%	very high
November Weather	8°C (47°F)	12 mm (0.5 inches)	82%	high
December Weather	3°C (37°F)	19 mm (0.8 inches)	82%	moderate