Last updated: August 23, 2025
In May, the average temperature in Heinaevesi, Finland sits at a brisk 9°C (48°F), making it an ideal time for cozy activities. Expect temperature fluctuations, with a minimum dipping as low as -4°C (25°F) and a maximum reaching up to 28°C (82°F). Visitors should be prepared for some rain, as 61 mm (2.4 in) of precipitation can fall over about 12 days. With an average humidity of 78%, the atmosphere may feel quite fresh and invigorating.
In May in Heinaevesi, the average temperature is 9°C (48°F). Maximums can reach 28°C (82°F), while minimums can drop as low as -4°C (25°F). Be prepared for varied weather conditions if you plan to travel during this month!
In Heinaevesi in May, the total precipitation amount is 61 mm (2.4 in), which occurs over a span of 12 days.
In Heinaevesi in May humidity is 78%. With an average temperature of 9°C (48°F), this humidity feels like a damp chill that clings to your skin, making outdoor excursions less enjoyable as you navigate the damp air.
In Heinaevesi 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 Heinaevesi.
UV Risk Categories
Weather in Heinaevesi varies notably across the year, with each month offering distinct climate conditions. This page compares May’s weather to other months in Heinaevesi, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -6°C (21°F) | 49 mm (1.9 inches) | 99% | low |
| February Weather | -7°C (20°F) | 44 mm (1.7 inches) | 98% | low |
| March Weather | -3°C (27°F) | 47 mm (1.8 inches) | 95% | moderate |
| April Weather | 2°C (35°F) | 43 mm (1.7 inches) | 87% | moderate |
| May Weather | 9°C (48°F) | 61 mm (2.4 inches) | 78% | moderate |
| June Weather | 16°C (61°F) | 67 mm (2.6 inches) | 75% | high |
| July Weather | 17°C (63°F) | 81 mm (3.2 inches) | 83% | high |
| August Weather | 15°C (60°F) | 87 mm (3.4 inches) | 88% | moderate |
| September Weather | 10°C (50°F) | 85 mm (3.4 inches) | 92% | moderate |
| October Weather | 5°C (41°F) | 79 mm (3.1 inches) | 95% | low |
| November Weather | 1°C (33°F) | 64 mm (2.5 inches) | 94% | low |
| December Weather | -4°C (25°F) | 70 mm (2.7 inches) | 98% | low |