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Basel, Basel-City Weather by Month and Climate Averages
Monthly normals · Rain · Snow
Sunshine · Freeze dates · Records · Best time to visit
What is the weather like in Basel, Basel-City?
Basel, Basel-City gets 734 mm of precipitation a year over about 177 rainy days. July is the warmest month (average high 27°C) and January the coldest (average low -2°C).
Oceanic climate
Basel, Basel-City has warm summers and chilly winters. Daytime highs range from about 6°C in January to 27°C in July. May is usually the wettest month. The most comfortable time to visit is typically April, June, and August to September, when daytime highs sit near 22°C.
| Season | Months | Avg low | Avg high |
|---|---|---|---|
| Winter | Dec–Feb | -1° | 7° |
| Spring | Mar–May | 4° | 17° |
| Summer | Jun–Aug | 13° | 26° |
| Autumn | Sep–Nov | 6° | 16° |
How much rain does Basel get?
Basel gets 734 mm of precipitation in an average year, spread over about 177 days with measurable rain. That is more rainy days than 69% of France.
May is the wettest month, with 78 mm. February is the driest, with 41 mm. September has the most rainy days, about 18.
The longest dry spell in the last five years lasted 17 days, to November 11, 2024.
Basel weather by month
Basel weather in January
In January, Basel averages a high of 6°C and a low of -2°C. It gets 45 mm of precipitation over about 13 rainy days. Estimated sunshine is 29% of daylight hours, derived from ERA5 cloud cover. The January record high is 20°C (1978) and the record low is -23°C (1985).
Basel weather in February
In February, Basel averages a high of 8°C and a low of -1°C. It gets 41 mm of precipitation over about 12 rainy days. Estimated sunshine is 32% of daylight hours, derived from ERA5 cloud cover. The February record high is 22°C (1990) and the record low is -21°C (1999).
Basel weather in March
In March, Basel averages a high of 13°C and a low of 1°C. It gets 45 mm of precipitation over about 13 rainy days. Estimated sunshine is 40% of daylight hours, derived from ERA5 cloud cover. The March record high is 26°C (2021) and the record low is -17°C (2005).
Basel weather in April
In April, Basel averages a high of 17°C and a low of 4°C. It gets 55 mm of precipitation over about 12 rainy days. Estimated sunshine is 40% of daylight hours, derived from ERA5 cloud cover. The April record high is 29°C (2018) and the record low is -6°C (2003). April is one of the most comfortable months to visit.
Basel weather in May
In May, Basel averages a high of 21°C and a low of 9°C. It gets 78 mm of precipitation over about 16 rainy days. Estimated sunshine is 35% of daylight hours, derived from ERA5 cloud cover. The May record high is 33°C (2022) and the record low is -2°C (1976).
Basel weather in June
In June, Basel averages a high of 24°C and a low of 12°C. It gets 76 mm of precipitation over about 15 rainy days. Estimated sunshine is 40% of daylight hours, derived from ERA5 cloud cover. The June record high is 37°C (2014) and the record low is 2°C (2005). June is one of the most comfortable months to visit.
Basel weather in July
In July, Basel averages a high of 27°C and a low of 14°C. It gets 68 mm of precipitation over about 15 rainy days. Estimated sunshine is 47% of daylight hours, derived from ERA5 cloud cover. The July record high is 38°C (2022) and the record low is 6°C (2011).
Basel weather in August
In August, Basel averages a high of 26°C and a low of 13°C. It gets 74 mm of precipitation over about 16 rainy days. Estimated sunshine is 44% of daylight hours, derived from ERA5 cloud cover. The August record high is 39°C (2003) and the record low is 3°C (1998). August is one of the most comfortable months to visit.
Basel weather in September
In September, Basel averages a high of 22°C and a low of 9°C. It gets 65 mm of precipitation over about 18 rainy days. Estimated sunshine is 41% of daylight hours, derived from ERA5 cloud cover. The September record high is 33°C (2023) and the record low is 1°C (2003). September is one of the most comfortable months to visit.
Basel weather in October
In October, Basel averages a high of 16°C and a low of 6°C. It gets 67 mm of precipitation over about 18 rainy days. Estimated sunshine is 27% of daylight hours, derived from ERA5 cloud cover. The October record high is 31°C (1985) and the record low is -6°C (1997).
Basel weather in November
In November, Basel averages a high of 10°C and a low of 2°C. It gets 58 mm of precipitation over about 14 rainy days. Estimated sunshine is 26% of daylight hours, derived from ERA5 cloud cover. The November record high is 23°C (2015) and the record low is -13°C (2010).
Basel weather in December
In December, Basel averages a high of 6°C and a low of -1°C. It gets 60 mm of precipitation over about 15 rainy days. Estimated sunshine is 23% of daylight hours, derived from ERA5 cloud cover. The December record high is 20°C (1973) and the record low is -18°C (1975).
Sunshine, humidity and wind in Basel
July is the sunniest month in Basel, with estimated sunshine of 47% of daylight hours from ERA5 cloud cover. December is the cloudiest, at 23%. The annual cloud-cover estimate is 35% of daylight hours; it is not a measurement of sunshine duration. Basel is cloudier than 65% of France.
Humidity peaks in December at 88% and is lowest in July at 65%.
Basel has about 7 days a year above 32°C. Basel is hotter than 51% of France.
First and last freeze in Basel
The first fall freeze in Basel typically comes around October 31, and the last spring freeze around April 18. That leaves a frost-free growing season of about 196 days.
Basel weather records
These records cover BALE MULHOUSE during 1973–2025. Earlier records or other stations in the city may differ.
The hottest temperature on record at the Basel station is 39°C, on August 13, 2003. The coldest is -23°C, on January 6, 1985.
The wettest day in the available station history brought 141 mm of precipitation, on June 26, 1982.
30 all-time records have been set at the station since 1973.
The best time to visit Basel
The most comfortable time to visit is typically April, June, and August to September, when daytime highs sit near 22°C.
Winter (December–February) is chilly, with average highs around 7°C and lows near -1°C.
Spring (March–May) is mild, with average highs around 17°C and lows near 5°C.
Summer (June–August) is warm, with average highs around 26°C and lows near 13°C.
Autumn (September–November) is mild, with average highs around 16°C and lows near 6°C.
Monthly climate
| Month | Average low | Average high | Precip | Rain days | Humidity | Estimated sunshine | Record high | Record low |
|---|---|---|---|---|---|---|---|---|
| January | -2° | 6° | 45 mm | 13 | 85% | 29% | 20° | -23° |
| February | -1° | 8° | 41 mm | 12 | 78% | 32% | 22° | -21° |
| March | 1° | 13° | 45 mm | 13 | 71% | 40% | 26° | -17° |
| April | 4° | 17° | 55 mm | 12 | 67% | 40% | 29° | -6° |
| May | 9° | 21° | 78 mm | 16 | 72% | 35% | 33° | -2° |
| June | 12° | 24° | 76 mm | 15 | 68% | 40% | 37° | 2° |
| July | 14° | 27° | 68 mm | 15 | 65% | 47% | 38° | 6° |
| August | 13° | 26° | 74 mm | 16 | 69% | 44% | 39° | 3° |
| September | 9° | 22° | 65 mm | 18 | 76% | 41% | 33° | 1° |
| October | 6° | 16° | 67 mm | 18 | 84% | 27% | 31° | -6° |
| November | 2° | 10° | 58 mm | 14 | 87% | 26% | 23° | -13° |
| December | -1° | 6° | 60 mm | 15 | 88% | 23% | 20° | -18° |
Station: BALE MULHOUSE, 5 km from the city. Temperature normal baseline: 1991–2020, calculated from available NOAA GHCN-Daily observations. Available station history: 1973–2025; record values refer to this station and period, not the entire city’s history. Precipitation includes rain and the water equivalent of frozen precipitation; snowfall depth is shown separately when available. Sources and methods
From ERA5 reanalysis. Sunshine is estimated from cloud cover.
Basel climate questions
How much rain does Basel get?
Basel gets 734 mm of precipitation in an average year, over about 177 rainy days.
What is the wettest month in Basel?
May is the wettest month in Basel, with 78 mm. February is the driest, with 41 mm.
How many rainy days does Basel have a year?
Basel has about 177 days with measurable rain in an average year. September has the most, about 18.
What is the hottest month in Basel?
July is the warmest month in Basel, with an average high of 27°C.
What is the coldest month in Basel?
January is the coldest month in Basel, with an average low of -2°C.
What is the record high temperature in Basel?
Within the available 1973–2025 station history, the record high at the Basel station is 39°C, set on August 13, 2003. The record low is -23°C, on January 6, 1985.
What is the sunniest month in Basel?
July is the sunniest month in Basel, with estimated sunshine of 47% of daylight hours from ERA5 cloud cover. December is the cloudiest.
When is the first frost in Basel?
The first fall freeze in Basel typically comes around October 31. The last spring freeze is around April 18.
What is the best time to visit Basel?
The most comfortable time to visit is typically April, June, and August to September, when daytime highs sit near 22°C.