June weather forecast
Helsinki, Finland

June showcases the arrival of summer in full force, presenting Helsinki in its most sun-soaked period. Being one of the warmest months, temperatures escalate to an amiable 18.5°C (65.3°F), rendering pleasant summer afternoons. Daylight, at its maximum, reaches an impressive 18.8h, making room for extended ubiquitous summer activities. Despite an increase in rainfall, the atmosphere remains predominantly dry, maintaining the spirit of summer. The elevated UV index denotes the sharp sunlight intensity, urging the use of sun protection.

Temperature

In Helsinki, the average high-temperature in June slightly rises, from a refreshing 14.4°C (57.9°F) in May, to an enjoyable 18.5°C (65.3°F). Helsinki, during the month of June, experiences an average low-temperature of 10.9°C (51.6°F).

Rainfall

In Helsinki, in June, during 14 rainfall days, 57mm (2.24") of precipitation is typically accumulated. Throughout the year, there are 182 rainfall days, and 655mm (25.79") of precipitation is accumulated.

Snowfall

April through October are months without snowfall.

Sea temperature

In Helsinki, in June, the average water temperature is 9°C (48.2°F).
Note: Unprotected swimming in 9°C (48.2°F) is dangerous due to potential cold shock. Especially when temperatures go below 10°C (50°F), leading to hyperventilation.

Daylight

June has the longest days of the year, with an average of 18h and 48min of daylight.
On the first day of June in Helsinki, sunrise is at 04:06 and sunset at 22:29. On the last day of the month, sunrise is at 04:00 and sunset at 22:47 EEST.

Sunshine

The month with the most sunshine is June, with an average of 9.9h of sunshine.

UV index

The months with the highest UV index in Helsinki are June and July, with an average maximum UV index of 5. A UV Index of 3 to 5 symbolizes a medium health hazard from unsafe exposure to UV radiation for ordinary individuals.
Note: In June, the maximum UV index of 5 suggests these recommendations:
Take necessary precautions - Protection from skin and eye injury is mandatory. Direct Sun exposure should be minimized especially during midday when radiation is most intense. A wide-brimmed hat is a shield, deflecting up to 50% of harmful UV radiation from eyes.