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Ulm, Baden-Wurttemberg Weather by Month and Climate Averages
Monthly normals · Rain · Snow
Sunshine · Freeze dates · Records · Best time to visit
What is the weather like in Ulm, Baden-Wurttemberg?
Ulm, Baden-Wurttemberg gets 950 mm of precipitation a year over about 178 rainy days. July is the warmest month (average high 22°C) and January the coldest (average low -4°C).
Humid continental climate
Ulm, Baden-Wurttemberg has warm summers and cold winters. Daytime highs range from about 2°C in January to 22°C in July. July is usually the wettest month. The most comfortable time to visit is typically May to June and August to September, when daytime highs sit near 19°C.
| Season | Months | Avg low | Avg high |
|---|---|---|---|
| Winter | Dec–Feb | -3° | 3° |
| Spring | Mar–May | 3° | 12° |
| Summer | Jun–Aug | 11° | 22° |
| Autumn | Sep–Nov | 4° | 12° |
How much rain does Ulm get?
Ulm gets 950 mm of precipitation in an average year, spread over about 178 days with measurable rain. That is more rainy days than 77% of Germany.
July is the wettest month, with 103 mm. April is the driest, with 61 mm. December has the most rainy days, about 18.
The longest dry spell in the last five years lasted 21 days, to June 4, 2023.
From October 2025 to September 2026 Ulm got 279 mm of rain, against a normal of 950 mm for those months. February 2026 had the most, with 117 mm.
Ulm weather by month
Ulm weather in January
In January, Ulm averages a high of 2°C and a low of -4°C. It gets 73 mm of precipitation over about 16 rainy days. Estimated sunshine is 24% of daylight hours, derived from ERA5 cloud cover. The January record high is 16°C (2002) and the record low is -25°C (1987).
Ulm weather in February
In February, Ulm averages a high of 3°C and a low of -4°C. It gets 65 mm of precipitation over about 14 rainy days. Estimated sunshine is 31% of daylight hours, derived from ERA5 cloud cover. The February record high is 19°C (1998) and the record low is -23°C (2012).
Ulm weather in March
In March, Ulm averages a high of 8°C and a low of -1°C. It gets 75 mm of precipitation over about 15 rainy days. Estimated sunshine is 39% of daylight hours, derived from ERA5 cloud cover. The March record high is 22°C (2021) and the record low is -21°C (1971).
Ulm weather in April
In April, Ulm averages a high of 13°C and a low of 2°C. It gets 61 mm of precipitation over about 14 rainy days. Estimated sunshine is 39% of daylight hours, derived from ERA5 cloud cover. The April record high is 28°C (2012) and the record low is -12°C (2010).
Ulm weather in May
In May, Ulm averages a high of 17°C and a low of 6°C. It gets 96 mm of precipitation over about 15 rainy days. Estimated sunshine is 33% of daylight hours, derived from ERA5 cloud cover. The May record high is 29°C (2017) and the record low is -5°C (2019). May is one of the most comfortable months to visit.
Ulm weather in June
In June, Ulm averages a high of 21°C and a low of 10°C. It gets 94 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 32°C (2014) and the record low is 1°C (1972). June is one of the most comfortable months to visit.
Ulm weather in July
In July, Ulm averages a high of 22°C and a low of 12°C. It gets 103 mm of precipitation over about 15 rainy days. Estimated sunshine is 42% of daylight hours, derived from ERA5 cloud cover. The July record high is 34°C (2022) and the record low is 2°C (2011).
Ulm weather in August
In August, Ulm averages a high of 22°C and a low of 11°C. It gets 83 mm of precipitation over about 14 rainy days. Estimated sunshine is 42% of daylight hours, derived from ERA5 cloud cover. The August record high is 36°C (2003) and the record low is 2°C (1980). August is one of the most comfortable months to visit.
Ulm weather in September
In September, Ulm averages a high of 18°C and a low of 8°C. It gets 69 mm of precipitation over about 13 rainy days. Estimated sunshine is 42% of daylight hours, derived from ERA5 cloud cover. The September record high is 30°C (2023) and the record low is -2°C (2022). September is one of the most comfortable months to visit.
Ulm weather in October
In October, Ulm averages a high of 12°C and a low of 4°C. It gets 73 mm of precipitation over about 14 rainy days. Estimated sunshine is 25% of daylight hours, derived from ERA5 cloud cover. The October record high is 26°C (2023) and the record low is -9°C (2012).
Ulm weather in November
In November, Ulm averages a high of 6°C and a low of 0°C. It gets 72 mm of precipitation over about 15 rainy days. Estimated sunshine is 23% of daylight hours, derived from ERA5 cloud cover. The November record high is 20°C (2009) and the record low is -18°C (2010).
Ulm weather in December
In December, Ulm averages a high of 3°C and a low of -3°C. It gets 84 mm of precipitation over about 18 rainy days. Estimated sunshine is 20% of daylight hours, derived from ERA5 cloud cover. The December record high is 16°C (1985) and the record low is -24°C (1973).
Sunshine, humidity and wind in Ulm
July is the sunniest month in Ulm, with estimated sunshine of 42% of daylight hours from ERA5 cloud cover. December is the cloudiest, at 20%. The annual cloud-cover estimate is 33% of daylight hours; it is not a measurement of sunshine duration. Ulm is sunnier than 74% of Germany.
Humidity peaks in December at 88% and is lowest in April at 65%.
Ulm has about 3 days a year above 32°C. Ulm is cooler than 76% of Germany.
First and last freeze in Ulm
The first fall freeze in Ulm typically comes around October 19, and the last spring freeze around May 4. That leaves a frost-free growing season of about 168 days.
Ulm weather records
These records cover MERKLINGEN during 1970–2026. Earlier records or other stations in the city may differ.
The hottest temperature on record at the Ulm station is 36°C, on August 13, 2003. The coldest is -25°C, on January 13, 1987.
The wettest day in the available station history brought 87 mm of precipitation, on November 6, 1979.
49 all-time records have been set at the station since 1970.
The annual mean temperature has changed by +0.3°C per decade since 1970.
The best time to visit Ulm
The most comfortable time to visit is typically May to June and August to September, when daytime highs sit near 19°C.
Winter (December–February) is cold, with average highs around 3°C and lows near -4°C.
Spring (March–May) is chilly, with average highs around 12°C and lows near 3°C.
Summer (June–August) is warm, with average highs around 22°C and lows near 11°C. It can feel humid.
Autumn (September–November) is chilly, with average highs around 12°C and lows near 4°C.
Monthly climate
| Month | Average low | Average high | Precip | Rain days | Humidity | Estimated sunshine | Record high | Record low |
|---|---|---|---|---|---|---|---|---|
| January | -4° | 2° | 73 mm | 16 | 84% | 24% | 16° | -25° |
| February | -4° | 3° | 65 mm | 14 | 77% | 31% | 19° | -23° |
| March | -1° | 8° | 75 mm | 15 | 68% | 39% | 22° | -21° |
| April | 2° | 13° | 61 mm | 14 | 65% | 39% | 28° | -12° |
| May | 6° | 17° | 96 mm | 15 | 70% | 33% | 29° | -5° |
| June | 10° | 21° | 94 mm | 15 | 68% | 40% | 32° | 1° |
| July | 12° | 22° | 103 mm | 15 | 65% | 42% | 34° | 2° |
| August | 11° | 22° | 83 mm | 14 | 71% | 42% | 36° | 2° |
| September | 8° | 18° | 69 mm | 13 | 76% | 42% | 30° | -2° |
| October | 4° | 12° | 73 mm | 14 | 83% | 25% | 26° | -9° |
| November | 0° | 6° | 72 mm | 15 | 87% | 23% | 20° | -18° |
| December | -3° | 3° | 84 mm | 18 | 88% | 20% | 16° | -24° |
Station: MERKLINGEN, 21 km from the city. Temperature normal baseline: 1991–2020, calculated from available NOAA GHCN-Daily observations. Available station history: 1970–2026; 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.
Ulm climate questions
How much rain does Ulm get?
Ulm gets 950 mm of precipitation in an average year, over about 178 rainy days.
What is the wettest month in Ulm?
July is the wettest month in Ulm, with 103 mm. April is the driest, with 61 mm.
How many rainy days does Ulm have a year?
Ulm has about 178 days with measurable rain in an average year. December has the most, about 18.
What is the hottest month in Ulm?
July is the warmest month in Ulm, with an average high of 22°C.
What is the coldest month in Ulm?
January is the coldest month in Ulm, with an average low of -4°C.
What is the record high temperature in Ulm?
Within the available 1970–2026 station history, the record high at the Ulm station is 36°C, set on August 13, 2003. The record low is -25°C, on January 13, 1987.
What is the sunniest month in Ulm?
July is the sunniest month in Ulm, with estimated sunshine of 42% of daylight hours from ERA5 cloud cover. December is the cloudiest.
When is the first frost in Ulm?
The first fall freeze in Ulm typically comes around October 19. The last spring freeze is around May 4.
What is the best time to visit Ulm?
The most comfortable time to visit is typically May to June and August to September, when daytime highs sit near 19°C.