May weather forecast
Tallinn, Estonia

May brings one of the best times to visit Tallinn, with weather conditions that many find agreeable. The temperature takes a pleasant turn, with highs averaging around 15.2°C (59.4°F). It's an ideal time to wander the cobbled streets of Tallin's Old Town or enjoy outdoor activities without the threat of rainfall or cold. Impending summer's impact is noticeable: days grow longer and the sea becomes slightly warm.

Temperature

May's onset witnesses a shift in the average high-temperature, moving from a frosty 9.2°C (48.6°F) in April to a mild 15.2°C (59.4°F). Tallinn reports a consistent average low-temperature of 5.2°C (41.4°F) throughout May nights.

Humidity

May is the least humid month, with an average relative humidity of 69%.

Rainfall

In Tallinn, Estonia, in May, during 11 rainfall days, 36mm (1.42") of precipitation is typically accumulated. In Tallinn, during the entire year, the rain falls for 120 days and collects up to 617mm (24.29") of precipitation.

Snowfall

Months with snowfall are January through May, October through December. May is the last month it regularly snows in Tallinn. Throughout May, there are 0.1 snowfall days. Throughout the year, there are 55.1 snowfall days.

Sea temperature

In Tallinn, the average seawater temperature in May is 7.2°C (45°F).
Note: Dipping into 7.2°C (45°F) below 10°C (50°F) is possible with the right protection; absent that, anticipate cold shock and hampered breathing. Swimming momentarily at 13°C (55.4°F) can be jarring.

Daylight

In Tallinn, Estonia, the average length of the day in May is 17h and 4min.
On the first day of May in Tallinn, Estonia, sunrise is at 05:19 and sunset at 21:16. On the last day of the month, sunrise is at 04:15 and sunset at 22:21 EEST.

Sunshine

In May, the average sunshine is 8.9h.

UV index

In May, the average daily maximum UV index in Tallinn is 4. A UV Index reading of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV rays for the average person.
Note: The daily maximum UV index of 4 in May interprets into the following advice:
Put precautions into practice - Protective measures against sun-induced damage are advised. The midday Sun can be harmful due to its potent UV radiation; seek shade and reduce exposure. Using UVA and UVB-protective sunglasses and sun-protective clothing is effective against UV radiation. Remember! The Sun's UV radiation can be magnified almost twofold by the reflection of snow.