January Weather in Onsala, Sweden

Last updated: August 27, 2025

In January, the average temperature in Onsala, Sweden hovers around 2°C (36°F). Expect chilly conditions, with minimum temperatures plunging to -13°C (8°F) and highs reaching up to 10°C (50°F). Be prepared for 53 mm (2.1 in) of precipitation spread over about 10 days, while the air maintains a high average humidity of 92%.

January Temperature in Onsala

In January in Onsala, the average temperature is 2°C (36°F). Maximums can reach 10°C (50°F), while minimums can drop as low as -13°C (8°F). Travelers should be prepared for chilly conditions and pack accordingly.

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

The chart illustrates January temperature patterns in Onsala, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Onsala, January typically has an average temperature of 2°C (36°F), with highs reaching up to 10°C (50°F) and lows dropping to around -13°C (8°F).

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

January Precipitation in Onsala

In Onsala in January, the precipitation amount is 53 mm (2.1 in) spread over a duration of 10 days.

January Precipitation Trends in Onsala

The chart displays monthly precipitation patterns in Onsala, 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 Onsala, January typically receives around 53 mm (2.1 inches) of precipitation spread over approximately 10 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 Onsala

In Onsala in January humidity is 92%. With an average temperature of 2°C (36°F), this humidity feels like a damp chill that seeps into your bones, making traveling uncomfortable and requiring extra layers to stay warm and dry.

January Average Humidity in Onsala

This chart illustrates the average monthly humidity levels in Onsala, 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 Onsala is approximately 92%, 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 Onsala

In Onsala in January, the maximum UV index is 1, which corresponds to a low Exposure Category. This means you have a time to burn of 45 minutes. For more details, you can check the Hourly UV Index in Onsala.

Maximum UV Index Levels in Onsala for January

The chart shows the monthly maximum UV Index (UVI) for Onsala 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 Onsala typically reaches 1, which falls under the low exposure category.

Data source: Onsala 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 Onsala Compares to Other Months

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

This table compares monthly weather conditions in Onsala, 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)	53 mm (2.1 inches)	92%	low
February Weather	1°C (35°F)	70 mm (2.7 inches)	91%	low
March Weather	3°C (38°F)	65 mm (2.6 inches)	89%	moderate
April Weather	7°C (45°F)	38 mm (1.5 inches)	84%	moderate
May Weather	12°C (53°F)	69 mm (2.7 inches)	75%	high
June Weather	17°C (62°F)	61 mm (2.4 inches)	73%	high
July Weather	18°C (64°F)	78 mm (3.1 inches)	73%	high
August Weather	17°C (63°F)	111 mm (4.4 inches)	77%	high
September Weather	14°C (57°F)	99 mm (3.9 inches)	85%	moderate
October Weather	10°C (50°F)	106 mm (4.2 inches)	91%	low
November Weather	6°C (43°F)	72 mm (2.8 inches)	92%	low
December Weather	3°C (37°F)	78 mm (3.1 inches)	91%	low