January Weather in Saint Johns, United States

Last updated: June 24, 2025

In January, the average temperature in Saint Johns, United States hovers around -4°C (26°F). However, be prepared for a range of conditions, as temperatures can dip to a chilling -26°C (-14°F) or rise to a mild 15°C (59°F). Expect a total precipitation of 63 mm (2.5 in) over 9 days, and don’t forget to bundle up, as the average humidity is a high 88%!

January Temperature in Saint Johns

In January in Saint Johns, the average temperature is -4°C (26°F). Maximums can reach 15°C (59°F) and minimums can drop as low as -26°C (-14°F). Be prepared for a wide range of temperatures and pack accordingly for your travels.

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 -4°C (26°F), with highs reaching up to 15°C (59°F) and lows dropping to around -26°C (-14°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 63 mm (2.5 in) spread over a duration of 9 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 63 mm (2.5 inches) of precipitation spread over approximately 9 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 88%. With an average temperature of -4°C (26°F), this humidity feels like walking through a heavy fog that clings to your skin, making each breath feel cold and damp, which can be quite uncomfortable for traveling.

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 88%, 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 is 2, which corresponds to a low exposure category. With this level of UV radiation, the time to burn is approximately 45 minutes. To learn more about the hourly UV index in Saint Johns, you can visit 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 2, which falls under the low 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	-4°C (26°F)	63 mm (2.5 inches)	88%	low
February Weather	-3°C (27°F)	66 mm (2.6 inches)	87%	moderate
March Weather	2°C (36°F)	63 mm (2.5 inches)	85%	moderate
April Weather	8°C (47°F)	88 mm (3.5 inches)	86%	very high
May Weather	15°C (60°F)	121 mm (4.8 inches)	80%	very high
June Weather	21°C (70°F)	117 mm (4.6 inches)	80%	very high
July Weather	24°C (75°F)	68 mm (2.7 inches)	80%	very high
August Weather	22°C (72°F)	68 mm (2.7 inches)	80%	very high
September Weather	18°C (65°F)	101 mm (4.0 inches)	80%	high
October Weather	12°C (53°F)	116 mm (4.6 inches)	84%	moderate
November Weather	3°C (38°F)	63 mm (2.5 inches)	89%	moderate
December Weather	0°C (32°F)	60 mm (2.4 inches)	86%	low