Temperatures in September
It's warm in September in Basel with an average temperature of 23°C. Temperatures this month range from a low of 19°C to a high of 26°C. At night, you can expect temperatures between 9°C and 15°C.
Max and Min Temperatures per Day
This chart shows the daily maximum and minimum temperatures in degrees Celsius for Basel in September. The red line indicates the max temperatures, and the blue line shows the minimums.
Start of September
The month of September starts in Basel with warm temperatures, averaging around 24°C during the day and nights close to 14°C. A few showers might pop up in the first days of the month, but the weather remains mostly sunny and dry.
Mid-September
By mid-September, the average daytime temperature stays the same at 24°C, with nights close to 13°C. Not much precipitation expected during this period. It’s mostly dry with sunshine.
End of September
By the end of September, the average daytime temperature in Basel will be around 21°C, with nights close to 11°C. A shower might show up, but overall the weather will be dry and sunny.
Precipitation in September
In September, there is an average of 50 mm of precipitation, spread over 8 days. The wind speed is around 3 Bft, mostly coming from the South.
The average precipitation chance is 28% per day this month. Though it seems pretty low, the weather’s variable. Some days have higher and others lower precipitation chances, which lowers the average.
Precipitation Chance
This chart shows the daily precipitation chance (in percentages) in September for Basel. 0% means it never rained on that day in the past 10 years, and 100% means it rained every day. All values in between represent the average chance of precipitation on that day.
Basel in September |
London | ||
|---|---|---|---|
 Average Temperature |
23°C | 20°C | |
 High Temp |
26°C | 22°C | |
| Low Temp |
19°C | 17°C | |
 Total Precipitation |
50 mm | 44 mm | |
| Rainy Days |
8 days | 8 days | |
August
UV index
The UV index is a maximum of 7 this month. That's a moderate to high value on the intensity scale of 1 to 11. Unprotected skin can burn within 15-25 minutes.
Is September a good time to visit Basel?
Want nice weather? Then September is a great time to be in Basel. You’ll have pleasant temperatures and not too much rain this month.
Temperature records for Basel in September
With 33°C, Basel hit the highest temperature in the last 10 years in September 2023. The lowest daytime temperature in this month was 10°C in 2020. The extreme night temperatures ranged from a low of 2°C to a high of 20°C.
Check out the climate of Basel for all months and discover the best travel time
Curious about the climate in other parts of Switzerland? Check out the weather and climate in places like Zurich, Geneva, Valais, or have a look at other destinations in Switzerland.
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Daily Temperature in September in Basel
This chart shows the average daily temperatures, both day and night, for each day in September in Basel, measured in degrees Celsius. The red line represents the maximum temperatures, while the blue line shows the minimums. The days of the month are displayed at the bottom of the chart. The data, based on historical observations, gives an overview of the average daily temperatures during this month.
Daily Precipitation in September in Basel
The chart below shows the average daily precipitation in September for Basel, measured in millimetres over the past years. Precipitation is always measured as water, even if it’s snow or hail. The days of the month are shown at the bottom of the chart.
A low average precipitation means that the chance of rain on that day is usually small, while a higher average suggests that rain is more likely. But it’s still an average, so each day can be different. Based on historical weather data for September, you can expect around 8 days of rain in Basel.
Daily UV Index in September in Basel
This chart shows the average daily UV index in September in Basel, with the UV index ranging from 0 to a maximum of 11. The bottom of the chart shows the days of the month. Based on historical data, this chart provides an idea of the daily UV radiation levels you can expect.
Temperature in September in Basel Over the Years
This chart shows the average temperature in September in Basel, measured in degrees Celsius, over the past years.
Total Precipitation in September in Basel Over the Years
This chart shows the average precipitation in September in Basel, measured in millimetres over the past years. Precipitation is always measured as water, even if it’s snow or hail.
Daily climate in September for Basel
Click on a specific day in September for detailed info on the typical weather on that day in Basel. Check out the historical temperatures and precipitation over the past 10 years on this day.
Weather experiences in September in Basel
Have you been to Basel in September?
Share your weather experience in September in Basel.
Average Weather in Basel by Month
Click on a month below to see detailed weather info for Basel. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.
