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May Weather in Harjavalta, Finland

Last updated: August 23, 2025

In May, the average temperature in Harjavalta, Finland hovers around 10°C (50°F). While you might experience a chilly minimum of -4°C (25°F), the days can warm up to a pleasant 28°C (83°F). Expect around 47 mm (1.9 in) of precipitation over 9 days, contributing to an average humidity of 77%.

May Temperature in Harjavalta

In May in Harjavalta, the average temperature is 10°C (50°F). Maximums can reach 28°C (83°F), and minimums can be as low as -4°C (25°F). This variability makes it essential to pack for both warm and cold weather when traveling to Harjavalta during this month.

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

The chart illustrates May temperature patterns in Harjavalta, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Harjavalta, May typically has an average temperature of 10°C (50°F), with highs reaching up to 28°C (83°F) and lows dropping to around -4°C (25°F).
JanFebMarAprMayJunJulAugSepOctNovDec272531395061646152433730
Data source: Temperature data for Harjavalta generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

May Precipitation in Harjavalta

In Harjavalta in May, the precipitation amount is 47 mm (1.9 in) spread over a period of 9 days.

May Precipitation Trends in Harjavalta

The chart displays monthly precipitation patterns in Harjavalta, 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 Harjavalta, May typically receives around 47 mm (1.9 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec434043384857909665755564
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Harjavalta

In Harjavalta in May, humidity is 77%. With an average temperature of 10°C (50°F), this humidity feels like a thick, heavy blanket enveloping you, making travel uncomfortable and sticky, as it clings to your skin and clothes, turning each step into a challenge.

May Average Humidity in Harjavalta

This chart illustrates the average monthly humidity levels in Harjavalta, 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 Harjavalta is approximately 77%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec92%90%89%85%77%78%78%79%86%90%91%89%
Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in Harjavalta

In Harjavalta 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 Harjavalta.

Maximum UV Index Levels in Harjavalta for May

The chart shows the monthly maximum UV Index (UVI) for Harjavalta 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 Harjavalta typically reaches 5, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec113456653211
Data source: Harjavalta 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 Harjavalta Compares to Other Months

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

This table compares monthly weather conditions in Harjavalta, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-3°C (27°F)43 mm (1.7 inches)92%low
February Weather-4°C (25°F)40 mm (1.6 inches)90%low
March Weather-1°C (31°F)43 mm (1.7 inches)89%moderate
April Weather4°C (40°F)38 mm (1.5 inches)85%moderate
May Weather10°C (50°F)47 mm (1.9 inches)77%moderate
June Weather16°C (61°F)57 mm (2.3 inches)78%high
July Weather18°C (64°F)90 mm (3.5 inches)78%high
August Weather16°C (61°F)96 mm (3.8 inches)79%moderate
September Weather11°C (53°F)65 mm (2.6 inches)86%moderate
October Weather6°C (44°F)75 mm (2.9 inches)90%low
November Weather3°C (37°F)55 mm (2.2 inches)91%low
December Weather-1°C (30°F)64 mm (2.5 inches)89%low

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