The 5 most scenic train journeys in Switzerland
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Aarau Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Aarau.
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Climate overview of Aarau
Temperatures in Aarau, Aargau, Switzerland, vary greatly throughout the year. July is the hottest month at 25°C (77°F), while January is the coldest at 5°C (41°F).
The city has a wet climate, receiving around 1472 mm (58 in) of rain/snowfall per year. Despite the high annual total, it has warm summers and cold winters. July is the wettest month. The most sunshine falls in July, with an average of 7.9 hours of daily sunshine.
Aarau Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Aarau - and find the best time to visit.
Monthly Temperature in Aarau
The climate in Aarau is known for significant temperature differences throughout the year, making the weather dynamic. On average, daytime temperatures range from a comfortable 25°C (77°F) in July to a chilly 5°C (41°F) in January.
Nighttime temperatures range from 14°C (57°F) in July to -1°C (30°F) in January.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Aarau
Aarau has a notably wet climate with abundant precipitation, recording 1472 mm (58 in) of rain/snowfall per year. The amount of precipitation varies moderately throughout the year. The wettest month, July, sees around 165 mm (6.5 in) of rainfall, perfect for those who enjoy a bit of rain now and then. The driest month, February, still receives a respectable 91 mm (3.6 in) of snow/rainfall. For more details, please visit our Aarau 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 Aarau
In Aarau, summer days are longer and more sunny, with daily sunshine hours peaking at 7.9 hours in July. As the darker season arrives, the brightness of the sun becomes less. December sees a soft sun for only 1.8 hours per average day.
Visit our detailed sunshine hours page for more information.
Monthly hours of sunshine
Data from: Basel, Switzerland (38 KM, 24 Miles).
Daily hours of sunshine
Data from: Basel, Switzerland (38 KM, 24 Miles).
Daily percentage of sunshine
Data from: Basel, Switzerland (38 KM, 24 Miles).
Humidity in Aarau by Month
The relative humidity is high throughout the year in Aarau.
The city experiences its highest humidity in November, reaching 82%. In April, the humidity drops to its lowest level at 68%. What does this mean? Read our detailed page on humidity levels for further details.
Relative humidity over the year
Data from: Basel, Switzerland (38 KM, 24 Miles).
Best Time to Visit Aarau
The most comfortable overall weather for exploring Aarau is usually found in June, July, August and September. Conditions are generally least comfortable in January, February, March, November and December.
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
Jan
cold
Feb
cold
Mar
wet
Apr
mixed
May
good
Jun
very good
Jul
very good
Aug
very good
Sep
very good
Oct
mixed
Nov
wet
Dec
wet
- Best overall: June, July, August and September
- Warmest weather: July and August
- Most sunshine: July
- Seasonal pattern: Warm summers and cold winters
- Coldest conditions: January, with freezing nights around -1°C (30°F).
Frequently asked questions about the climate in Aarau
What is the best time to visit Aarau?
June, July, August and September typically offer the most optimal weather in Aarau. In contrast, January, February, March, November and December tend to have less optimal conditions. Aarau has warm summers and cold winters.
What temperatures can I expect in Aarau?
Daytime highs range from 5°C (41°F) in January to 25°C (77°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 Aarau get?
Annual rainfall is around 1472 mm (58 in). July is the wettest month with 165 mm (6.5 in), while February is the driest with 91 mm (3.6 in).
How sunny is Aarau?
Aarau receives around 1,701 hours of sunshine per year. July is the sunniest month with 237 hours, while December is the cloudiest with just 53 hours.
Aarau 3-Day Forecast
Aarau on the map
Aarau is highlighted - select any city to see its climate.
Popular in September
Where to go in September - average daytime high across popular destinations.
Zürich
20°C (68°F) Crans-Montana15°C (59°F) Engelberg
15°C (59°F) Nendaz15°C (59°F) Saas-Fee12°C (54°F) Davos13°C (55°F) Grindelwald13°C (55°F) Zermatt11°C (52°F) Bucket list
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