May Weather in Posio, Finland

Last updated: August 23, 2025

In May, the average temperature in Posio, Finland hovers around 5°C (41°F), with temperatures ranging from a brisk -8°C (19°F) to a surprisingly warm 24°C (76°F). Expect about 49 mm (1.9 in) of precipitation spread over 10 days, contributing to an average humidity of 83%. Be prepared for a mix of weather, perfect for cozy indoor activities or brisk outdoor adventures!

May Temperature in Posio

In May in Posio, the average temperature is 5°C (41°F), with maximums reaching up to 24°C (76°F) and minimums dipping as low as -8°C (19°F). Travelers should prepare for a wide range of temperatures and pack accordingly for both warm days and chilly nights.

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

The chart illustrates May temperature patterns in Posio, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Posio, May typically has an average temperature of 5°C (41°F), with highs reaching up to 24°C (76°F) and lows dropping to around -8°C (19°F).
JanFebMarAprMayJunJulAugSepOctNovDec141321314154595445352720
Data source: Temperature data for Posio 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 Posio

In Posio in May, the total precipitation amount is 49 mm (1.9 in) over the course of 10 days.

May Precipitation Trends in Posio

The chart displays monthly precipitation patterns in Posio, 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 Posio, May typically receives around 49 mm (1.9 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec4340444349857611082827158
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Posio

In Posio in May humidity is 83%. With an average temperature of 5°C (41°F), this humidity feels like a damp chill that seeps into your bones, making traveling uncomfortable and necessitating extra layers to stay warm and dry.

May Average Humidity in Posio

This chart illustrates the average monthly humidity levels in Posio, 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 Posio is approximately 83%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec101%99%94%88%83%79%83%88%91%96%96%100%
Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in Posio

In Posio 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 Posio.

Maximum UV Index Levels in Posio for May

The chart shows the monthly maximum UV Index (UVI) for Posio 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 Posio typically reaches 5, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec112356643211
Data source: Posio 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 Posio Compares to Other Months

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

This table compares monthly weather conditions in Posio, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-10°C (14°F)43 mm (1.7 inches)101%low
February Weather-10°C (14°F)40 mm (1.6 inches)99%low
March Weather-6°C (21°F)44 mm (1.7 inches)94%low
April Weather0°C (32°F)43 mm (1.7 inches)88%moderate
May Weather5°C (41°F)49 mm (1.9 inches)83%moderate
June Weather12°C (55°F)85 mm (3.4 inches)79%high
July Weather15°C (60°F)76 mm (3.0 inches)83%high
August Weather12°C (55°F)110 mm (4.3 inches)87%moderate
September Weather7°C (46°F)82 mm (3.2 inches)91%moderate
October Weather2°C (35°F)82 mm (3.2 inches)96%low
November Weather-3°C (27°F)71 mm (2.8 inches)96%low
December Weather-7°C (20°F)58 mm (2.3 inches)100%low

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