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Climate in Uusimaa
(Finland)

Average daytime and nighttime temperatures


All climatic 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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Uusimaa is one of the warmest region in Finland with an average daily high temperature of 10 degrees centigrade. 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 here and given to the water temperatures of 17 degrees maximum you will leave your bathing togs 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
Hours of sunshine per daySunshine hours per day in Uusimaa
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 greater region Uusimaa. In December the sun shines the shortest.
Rainy days per monthRainy days per month in Uusimaa
A rainy day is a day on which at least an amount of 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 rainy days, December offers the most number of rainy days, and in April the least.
Precipitation in mm/dayPrecipitation in Uusimaa
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 rain falls in April. August, on the other hand, has the most rain.
Water temperatureWater temperatures in Uusimaa
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 temperatures in Uusimaa are in August, when the water is 17 °C.
Relative humidity in %Relative humidity in Uusimaa
Warm air can absorb more moisture than cold air. The relative humidity indicates how much moisture of the physically possible is actually contained in the air. At high humidity, the person feels uncomfortable and perceives this as oppressive. In general, a relative humidity of 40-60% gives as 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/m³Absolute humidity in Uusimaa
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
Turku190,50060° 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: geonames.org, United Nations Statistics Division and own research.
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