Onsala Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Onsala.
Climate overview of Onsala
The climate in Onsala, Halland, Sweden, is marked by large temperature swings across the seasons, ranging from 22°C (72°F) in July to 4°C (39°F) in February.
Onsala sees a moderate amount of rain/snowfall, totalling around 967 mm (38 in) per year. It experiences pleasant summers and cold winters, creating some seasonal variation. May is the sunniest month, averaging 7.8 hours of sunshine per day.
Onsala Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Onsala - and find the best time to visit.
Monthly Temperature in Onsala
In Onsala, temperatures differ significantly between summer and winter months. Average maximum daytime temperatures range from a pleasant 22°C (72°F) in July, the warmest time of the year, to a chilly 4°C (39°F) during cooler months like February.
At night, you can expect temperatures ranging from 14°C (57°F) in July to around -1°C (30°F) during February.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Onsala
On average, Onsala receives a reasonable amount of rain/snowfall, with an annual precipitation of 967 mm (38 in). While rainfall varies throughout the year, each season offers its own charm. August brings wetter days averaging 109 mm (4.3 in) of precipitation, spread over 12 rainy days.
In contrast, the driest month March experiences a drier climate, with about 53 mm (2.1 in) of rainfall spread across 13 rainy days. For more details, please visit our Onsala Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Sunshine Hours in Onsala
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.
Visit our detailed sunshine hours page for more information.
Monthly hours of sunshine
Daily hours of sunshine
Humidity in Onsala by Month
The relative humidity is high throughout the year in Onsala.
The city experiences its highest humidity in January, reaching 86%. In May, the humidity drops to its lowest level at 72%. What does this mean? Read our detailed page on humidity levels for further details.
Relative humidity over the year
Best Time to Visit Onsala
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
- Best overall: July
- Warmest weather: July and August
- Most sunshine: May
- Seasonal pattern: Pleasant summers and cold winters
- Coldest conditions: February, with freezing nights around -1°C (30°F).
Frequently asked questions about the climate in Onsala
What is the best time to visit Onsala?
July typically offers the most optimal weather in Onsala. In contrast, January, February, March, October, November and December tend to have less optimal conditions. Onsala has pleasant summers and cold winters.
What temperatures can I expect in Onsala?
Daytime highs range from 4°C (39°F) in February to 22°C (72°F) in July. Nighttime lows range from -1°C (30°F) to 14°C (57°F). Temperatures vary considerably through the year.
How much rain does Onsala get?
Annual rainfall is around 967 mm (38 in). August is the wettest month with 109 mm (4.3 in), while March is the driest with 53 mm (2.1 in).
How sunny is Onsala?
Onsala receives around 1,612 hours of sunshine per year. May is the sunniest month with 233 hours, while December is the cloudiest with just 42 hours.
Onsala 3-Day Forecast
Onsala on the map
Onsala is highlighted - select any city to see its climate.
Popular this month
Where to go in August - average daytime high across popular destinations.
Lund
22°C (72°F) Malmö23°C (73°F) Gothenburg21°C (70°F) Falkenberg22°C (72°F) Visby
22°C (72°F) Stockholm22°C (72°F) Karlskrona21°C (70°F) Simrishamn20°C (68°F) 
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