May Weather in Heinola, Finland

Last updated: August 23, 2025

In May, the average temperature in Heinola, Finland is a cool 9°C (49°F). During this time, temperatures can range from a chilly -3°C (28°F) to a warm 28°C (83°F). Expect about 56 mm (2.2 in) of rainfall over 10 days, coupled with an average humidity of 75%.

May Temperature in Heinola

In May in Heinola, the average temperature is 9°C (49°F), with maximums reaching 28°C (83°F) and minimums dropping to as low as -3°C (28°F). It's a great time for travelers to experience a range of weather, so be sure to pack layers for varying conditions.

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

The chart illustrates May temperature patterns in Heinola, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Heinola, May typically has an average temperature of 9°C (49°F), with highs reaching up to 28°C (83°F) and lows dropping to around -3°C (28°F).

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

May Precipitation in Heinola

In Heinola in May, the precipitation amount is 56 mm (2.2 in) over the course of 10 days.

May Precipitation Trends in Heinola

The chart displays monthly precipitation patterns in Heinola, 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 Heinola, May typically receives around 56 mm (2.2 inches) of precipitation spread over approximately 10 days.

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

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

May Humidity in Heinola

In Heinola in May, humidity is 75%. With an average temperature of 9°C (49°F), this humidity feels like a damp chill that wraps around you, making outdoor activities uncomfortable and causing your clothes to cling uncomfortably. It's advisable to dress in layers to stay warm, while also being prepared for the persistent moisture in the air that can leave you feeling a bit sluggish throughout your travels.

May Average Humidity in Heinola

This chart illustrates the average monthly humidity levels in Heinola, 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 Heinola is approximately 75%, 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 Heinola

In Heinola 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 Heinola.

Maximum UV Index Levels in Heinola for May

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

Data source: Heinola 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 Heinola Compares to Other Months

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

This table compares monthly weather conditions in Heinola, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-4°C (25°F)	47 mm (1.9 inches)	98%	low
February Weather	-5°C (23°F)	44 mm (1.7 inches)	96%	low
March Weather	-2°C (29°F)	43 mm (1.7 inches)	93%	moderate
April Weather	3°C (38°F)	47 mm (1.8 inches)	87%	moderate
May Weather	9°C (49°F)	56 mm (2.2 inches)	75%	moderate
June Weather	15°C (60°F)	62 mm (2.5 inches)	74%	high
July Weather	17°C (63°F)	80 mm (3.1 inches)	80%	high
August Weather	16°C (61°F)	87 mm (3.4 inches)	85%	moderate
September Weather	11°C (52°F)	64 mm (2.5 inches)	90%	moderate
October Weather	6°C (43°F)	77 mm (3.0 inches)	94%	low
November Weather	2°C (36°F)	54 mm (2.1 inches)	94%	low
December Weather	-2°C (28°F)	69 mm (2.7 inches)	96%	low