Climate in Uusimaa

Average daytime and nighttime temperatures

All climate diagrams on this site result from the collected data from five measuring weather stations in Uusimaa.
All data correspond to the average monthly values of the last 20 years.

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With an average daily maximum temperature of 10 degrees, Uusimaa is one of the warmest regions in Finland. The climate widely corresponds to Central European weather conditions. It is cold, wet and a few beautiful summer months are also happening during a year. It won't be really warm up here and given to the water temperatures of 17 degrees maximum you will leave your bathing clothes at home. Due to the warmer temperatures, the best time for traveling is from May to September. Less attractive are the cold months from November to April.
Overview: Climate in Finland
Daylengths and sun positions in Finland
Compare climate with other regions or countries
Sunshine hours per day
The number of hours of sunshine refers to the time when the sun is actually visible. That is, without any obstruction of visibility by clouds, fog or mountains. With 10 hours per day, June is the sunniest month in the greater region of Uusimaa. In December, the sun shines the least.
Rain days per month
A rain day is a day on which at least 0.1 mm precipitation (=0.1 liter) per square meter falls. This can be rain, snow, hail or even dew. So it does not have to rain the whole day. With 13 rain days, December offers the most rain days, while April has the fewest.
Precipitation amount in mm/day
The amount of precipitation is measured in millimeters per square meter. Thus, at two mm/day, two liters of water fall on one square meter within 24 hours. With only 0.9 mm, the least amount of rain falls in March. August, on the other hand, has the most rain.
Water temperatures in °C
Water temperature depends not only on solar radiation within the same region, but also on ocean currents. For example, depending on the season, cold or warm water masses are moved from other areas. The warmest water temperatures in Uusimaa are in August, when the water is 17 °C.
Relative humidity in %
Warm air can absorb more moisture than cold air. The relative humidity indicates how much moisture can be physically contained in the air. At high humidity, a person feels uncomfortable and perceives this as oppressive. In general, a relative humidity of 40-60% feels pleasant. With only 64% humidity on average, it is quite dry in June. The highest value of 90% is experienced here in December.
Absolute humidity in g/m³
In warm months, there is also a higher absolute humidity almost everywhere. At a temperature of 25°C, air can absorb up to 23 grams of water per cubic meter. At 20°C, it is only 17.3 grams. A relative humidity of 40% at 25°C thus corresponds to an absolute humidity of 9.2 grams of water. From a proportion of approx. 13.5 grams, humans perceive the air as muggy.
Climate charts for other greater regions in Finland

Map of Uusimaa

Most important cities in the greater region »Uusimaa«

The greater region has a west-east extension of about 130 km and over 100 km from north to south.

CityPopulationGeo position
Turku194,39160° 27' 5"N22° 16' 7"E
Salo24,90060° 22' 60"N23° 7' 60"E
Raisio23,59760° 29' 9"N22° 10' 8"E
Kaarina21,68460° 24' 26"N22° 22' 9"E
Uusikaupunki16,22660° 48' 2"N21° 24' 30"E
Länsi-Turunmaa15,49860° 17' 59"N22° 18' 1"E
Lieto15,25860° 30' 37"N22° 27' 42"E
Naantali13,60760° 28' 3"N22° 1' 27"E
Pargas11,96260° 18' 24"N22° 18' 3"E
Paimio10,12660° 27' 24"N22° 41' 13"E
Somero9,84060° 37' 0"N23° 31' 60"E
Halikko9,34460° 23' 60"N23° 4' 60"E
Laitila8,40360° 52' 33"N21° 41' 52"E
Piikkiö6,55360° 25' 29"N22° 30' 58"E
Mynämäki6,27160° 40' 45"N21° 59' 34"E
Masku5,97460° 34' 15"N22° 5' 56"E
Perniö5,80960° 12' 0"N23° 7' 60"E
Nousiainen4,46160° 36' 15"N22° 4' 45"E
Pertteli3,74060° 25' 60"N23° 16' 0"E
Rusko3,70260° 31' 60"N22° 13' 0"E
Aura3,69360° 38' 50"N22° 35' 15"E
Pöytyä3,65060° 46' 0"N22° 40' 0"E
Dragsfjärd3,30960° 4' 0"N22° 28' 60"E
Kimito3,28760° 9' 38"N22° 43' 44"E
Alastaro2,97560° 55' 60"N22° 55' 0"E
Sauvo2,94160° 20' 35"N22° 41' 47"E
Karinainen2,49760° 40' 0"N22° 46' 0"E
Vehmaa2,43560° 40' 60"N21° 40' 0"E
Pyhäranta2,35560° 57' 0"N21° 26' 60"E
Yläne2,14860° 52' 60"N22° 25' 0"E

Data basis: German Weather Service, individual values averaged and supplemented by own elements. Data on cities and inhabitants:, United Nations Statistics Division and own research.
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