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Onsala Climate by Month

The climate in Onsala is marked by big temperature swings throughout the year. Temperatures range from pleasant during the warmest months to cold in the cooler months. It receives mid-range precipitation levels. Now, let’s explore all the climate details to give you a full picture.

Average day and night temperature

In Onsala, temperatures differ significantly between summer and winter months. Average daytime temperatures range from a pleasant 22°C in July, the warmest time of the year, to a chilly 4°C during cooler months like February. At night, temperatures typically average around -1°C during these months.

The mean minimum and maximum temperatures throughout the year

Precipitation and rainy days

On average, Onsala receives a reasonable amount of rain/snowfall, with an annual precipitation of 967 mm. While rainfall varies throughout the year, each season offers its own charm. August brings wetter days averaging 109 mm of precipitation, spread over 12 rainy days.

In contrast, March experiences a drier climate, with about 53 mm of rainfall spread across 13 rainy days.

The mean monthly precipitation over the year, including rain, hail and snow

Sunshine over the year

Seasonal changes in sunshine hours are quite dramatic in Onsala. While May receives considerable daily sunshine with up to 7.8 hours, December marks the darkest time of the year, where sunshine is scarce with only 1.4 hours of sunlight per day.

Monthly hours of sunshine

Data from: Falkenberg, Sweden (64 KM, 40 Miles).

Daily hours of sunshine

Data from: Falkenberg, Sweden (64 KM, 40 Miles).

The best time of year to visit Onsala in Sweden

During the months of July and August you are most likely to experience good weather with pleasant average temperatures that fall between 20°C and 26°C.

Other facts from our historical weather data:
  • Which is the warmest month in Onsala?
    July has an average maximum temperature of 22°C and is the warmest month of the year.
  • Which is the coldest month in Onsala?
    The coldest month is February with an average maximum temperature of 4°C.
  • Which is the wettest month in Onsala?
    August tops the wettest month list with 109 mm of rainfall.
  • Which is the driest month in Onsala?
    March is the driest month with 53 mm of precipitation.
  • Which is the sunniest month in Onsala?
    May is the sunniest month with an average of 233 hours of sunshine.

  • No idea where to travel to this year? We have a tool that recommends destinations based on your ideal conditions. Find out where to go with our weather planner.

    Forecast for Onsala

    Thu   Dec 12
    1°C | -3°C
    E 7 km/h
    partly cloudy and no rain

    partly cloudy and no rain

    Fri   Dec 13
    3°C | -1°C
    SW 22 km/h
    1.5 mm
    overcast and rain

    overcast and rain

    Sat   Dec 14
    5°C | 1°C
    SW 29 km/h
    5.3 mm
    broken clouds and rain

    broken clouds and rain