May Weather in Alster, Sweden

Last updated: August 27, 2025

In May, the average temperature in Alster, Sweden hovers around 11°C (53°F). You can expect a minimum chill of -2°C (29°F) and a pleasant maximum of 29°C (85°F). With an average humidity of 72% and 64 mm (2.5 in) of precipitation spread over 12 days, be prepared for a mix of weather during your visit!

May Temperature in Alster

In May in Alster, the average temperature is 11°C (53°F). The maximum can reach 29°C (85°F), while the minimum can drop to as low as -2°C (29°F). Packing layers is essential for travelers during this time to ensure comfort in varying temperatures.

May Weather in Alster: Daily Temperature Highs, Lows, and Averages

The chart illustrates May temperature patterns in Alster, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Alster, May typically has an average temperature of 11°C (53°F), with highs reaching up to 29°C (85°F) and lows dropping to around -2°C (29°F).

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

May Precipitation in Alster

In Alster in May, the total precipitation amount is 64 mm (2.5 in) over the course of 12 days.

May Precipitation Trends in Alster

The chart displays monthly precipitation patterns in Alster, with values for each month alongside May’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how May’s conditions compare to those of other months. In Alster, May typically receives around 64 mm (2.5 inches) of precipitation spread over approximately 12 days.

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

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Millimeters (mm) Inches (in)

May Humidity in Alster

In Alster in May, humidity is 72%. With an average temperature of 11°C (53°F), this humidity feels like a damp chill that clings to your skin, making outdoor activities slightly uncomfortable and the air heavy, which can dampen the enjoyment of sightseeing and exploring.

May Average Humidity in Alster

This chart illustrates the average monthly humidity levels in Alster, with May’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In May, average humidity in Alster is approximately 72%, offering insight into how humid the weather typically is during this month.

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

May UV Index in Alster

In Alster in May, 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 Alster.

Maximum UV Index Levels in Alster for May

The chart shows the monthly maximum UV Index (UVI) for Alster in May, 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 May, the maximum UV index in Alster typically reaches 5, which falls under the moderate exposure category.

Data source: Alster May 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 May Weather in Alster Compares to Other Months

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

This table compares monthly weather conditions in Alster, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-1°C (31°F)	48 mm (1.9 inches)	94%	low
February Weather	-1°C (30°F)	47 mm (1.9 inches)	92%	low
March Weather	2°C (35°F)	49 mm (1.9 inches)	89%	moderate
April Weather	6°C (43°F)	31 mm (1.2 inches)	81%	moderate
May Weather	11°C (53°F)	64 mm (2.5 inches)	72%	moderate
June Weather	17°C (63°F)	60 mm (2.4 inches)	68%	high
July Weather	18°C (65°F)	69 mm (2.7 inches)	70%	high
August Weather	16°C (62°F)	86 mm (3.4 inches)	77%	moderate
September Weather	12°C (54°F)	78 mm (3.1 inches)	86%	moderate
October Weather	8°C (46°F)	85 mm (3.4 inches)	91%	low
November Weather	3°C (38°F)	68 mm (2.7 inches)	93%	low
December Weather	0°C (32°F)	74 mm (2.9 inches)	94%	low