Last updated: August 23, 2025
In May, the average temperature in Seinaejoki, Finland hovers around 9°C (49°F), offering a refreshing yet variable climate. While temperatures can dip as low as -5°C (23°F), they can also reach a pleasant 28°C (82°F) on warmer days. With an average precipitation of 60 mm (2.3 in) spread across 10 days, expect some rainy interludes, complemented by an average humidity of 77% that adds to the area's distinct atmosphere.
In May in Seinaejoki, the average temperature is 9°C (49°F). The maximum can reach 28°C (82°F), while the minimum can be as low as -5°C (23°F). This diverse range of temperatures makes Seinaejoki an interesting destination for travelers seeking both warmth and a touch of winter chill.
In Seinaejoki in May, the precipitation amount is 60 mm (2.3 in) over a span of 10 days.
In Seinaejoki in May humidity is 77%. With an average temperature of 9°C (49°F), this humidity feels like a damp chill that seeps into your bones, making outdoor explorations feel colder and more uncomfortable than the thermometer suggests.
In Seinaejoki 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 Seinaejoki.
UV Risk Categories
Weather in Seinaejoki varies notably across the year, with each month offering distinct climate conditions. This page compares May’s weather to other months in Seinaejoki, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -4°C (24°F) | 37 mm (1.4 inches) | 97% | low |
| February Weather | -5°C (22°F) | 39 mm (1.5 inches) | 95% | low |
| March Weather | -2°C (29°F) | 41 mm (1.6 inches) | 92% | moderate |
| April Weather | 3°C (38°F) | 44 mm (1.7 inches) | 85% | moderate |
| May Weather | 9°C (49°F) | 60 mm (2.3 inches) | 77% | moderate |
| June Weather | 15°C (60°F) | 61 mm (2.4 inches) | 74% | high |
| July Weather | 17°C (63°F) | 59 mm (2.3 inches) | 79% | high |
| August Weather | 15°C (59°F) | 90 mm (3.6 inches) | 82% | moderate |
| September Weather | 10°C (50°F) | 71 mm (2.8 inches) | 89% | moderate |
| October Weather | 5°C (41°F) | 75 mm (2.9 inches) | 93% | low |
| November Weather | 1°C (34°F) | 58 mm (2.3 inches) | 93% | low |
| December Weather | -3°C (28°F) | 47 mm (1.9 inches) | 95% | low |