Helsinki Monthly Rainfall & Precipitation

This page shows both the average monthly rainfall and the number of rainy days in Helsinki, Southern Finland, Finland. Long-term data from 1990 to 2020 was used to calculate these averages. Now, let's explore all the details to give you a full picture.

Generally, Helsinki experiences moderate precipitation patterns, averaging 736 mm (29 in) yearly.

Monthly Precipitation Levels

The average number of days each month with precipitation (> 0.2 mm (0.01 in))

The amount of precipitation varies moderately throughout the year. The wettest month, July, sees around 80 mm (3.1 in) of rainfall, perfect for those who enjoy a bit of rain now and then. The driest month, March, still receives a respectable 42 mm (1.7 in) of snow/rainfall.

July, the wettest month, has a maximum daytime temperature of 23°C (73°F). The city receives 291 hours of sunshine in this period. During the driest month March you can expect a temperature of 3°C (37°F). For more detailed insights into the city's temperatures, visit our Helsinki Temperature page.

Helsinki's average annual precipitation is 736 mm (29 in). Let's compare this to some popular worldwide tourist destinations:

Boston, USA, experiences 1238 mm (49 in) of annual precipitation, including significant snowfall during the winter.

Osaka, Japan, experiences 1507 mm (59 in) of rainfall annually, spread across the year with wetter summers.

Melbourne, Australia, has 690 mm (27 in) of rainfall annually, spread fairly evenly throughout the year.

Kuala Lumpur, Malaysia, receives 2529 mm (100 in) of annual rainfall, characteristic of its equatorial tropical rainforest climate, with consistent rainfall throughout the year and peak months during March and November.

Precipitation amounts are measured using specific gauges installed at weather stations, collecting both rain and snow and any other type of precipitation. Rainfall is measured directly in millimeters, while that from snow and ice is obtained by melting it. Automated systems often incorporate heaters to make this easier.

Information from these stations is transmitted via Wi-Fi, satellite, GPS, or telephone connections to central monitoring networks. This information is immediately updated and integrated into weather models and forecasts.

• Mawsynram in India is noted as being the wettest place on earth, with over 11 meters (36 feet) of rain falling every year.
• In contrast, Antofagasta in Chile is among the driest places on the planet, getting less than 0.1mm (0.004 inches) per year, with some years recording virtually no rainfall.
• Nearly 1,650 thunderstorm cells are estimated over the planet at any given time.

For more detailed information about Helsinki's weather, including sunshine hours, humidity levels, and temperature data, visit our Helsinki Climate page.