Last updated: August 23, 2025
In May, the average temperature in Isojoki, Finland hovers around 9°C (49°F). Minimum temperatures can dip to -5°C (23°F), while maximums can rise to a warm 28°C (83°F). This month experiences around 47 mm (1.8 in) of precipitation spread over 9 days, contributing to a notably high average humidity of 77%.
In May in Isojoki, the average temperature is 9°C (49°F). Maximums can reach 28°C (83°F), while minimums can be as low as -5°C (23°F). Be prepared for both warm and chilly weather during your travels.
In Isojoki in May, the total precipitation amount is 47 mm (1.8 in), which falls over the course of 9 days.
In Isojoki 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 Isojoki 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 Isojoki.
UV Risk Categories
Weather in Isojoki varies notably across the year, with each month offering distinct climate conditions. This page compares May’s weather to other months in Isojoki, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -4°C (26°F) | 43 mm (1.7 inches) | 92% | low |
| February Weather | -5°C (24°F) | 46 mm (1.8 inches) | 90% | low |
| March Weather | -2°C (29°F) | 48 mm (1.9 inches) | 89% | moderate |
| April Weather | 3°C (38°F) | 46 mm (1.8 inches) | 85% | moderate |
| May Weather | 9°C (49°F) | 47 mm (1.8 inches) | 77% | moderate |
| June Weather | 16°C (61°F) | 69 mm (2.7 inches) | 78% | high |
| July Weather | 17°C (63°F) | 87 mm (3.4 inches) | 78% | high |
| August Weather | 15°C (60°F) | 113 mm (4.5 inches) | 79% | moderate |
| September Weather | 11°C (51°F) | 77 mm (3.0 inches) | 86% | moderate |
| October Weather | 6°C (42°F) | 80 mm (3.1 inches) | 90% | low |
| November Weather | 2°C (35°F) | 68 mm (2.7 inches) | 91% | low |
| December Weather | -2°C (29°F) | 67 mm (2.6 inches) | 89% | low |