Last updated: March 2, 2024
The weather in Helsinki, Finland, during May is characterized by an average temperature of 10°C (50°F). Highs can soar to 23°C (73°F), while lows may dip to -2°C (30°F). Typically, the humidity level in Helsinki throughout May hovers around 75%.
Minimum temperature
Average temperature
Maximum temperature
Humidity
In May, Helsinki averages 56 mm (2.2 inches) of rainfall, typically over the course of 10 rainy days. The month enjoys an average of 17 hours 14 minutes of daylight, with the sun shining for approximately 14 hours 33 minutes each day. Additionally, there is a 31% probability of sunny days during this period.
Precipitation
Rainy days
Sunshine hours
Chance of sun
In May, the UV Index in Helsinki reaches a maximum of 5, indicating a level of Moderate exposure. The most intense UV radiation typically occurs between 12:00 and 14:00, during which unprotected skin may burn in as little as 30 minutes.
| 07:00 | 08:00 | 09:00 | 10:00 | 11:00 | 12:00 | 13:00 | 14:00 | 15:00 | 16:00 | 17:00 | 18:00 | 19:00 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UVI | 1 | 2 | 2 | 3 | 4 | 5 | 5 | 5 | 4 | 3 | 3 | 2 | 1 |
| Exposure | Low | Moderate | Low | ||||||||||
| Time to burn | 45 min | 30 min | 45 min | ||||||||||