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Mainz, Rheinland-Pfalz Weather by Month and Climate Averages
Monthly normals · Rain · Snow
Sunshine · Freeze dates · Records · Best time to visit
What is the weather like in Mainz, Rheinland-Pfalz?
Mainz, Rheinland-Pfalz gets 580 mm of precipitation a year over about 144 rainy days. July is the warmest month (average high 26°C) and January the coldest (average low 0°C).
Oceanic climate
Mainz, Rheinland-Pfalz has warm summers and chilly winters. Daytime highs range from about 5°C in January to 26°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 23°C.
| Season | Months | Avg low | Avg high |
|---|---|---|---|
| Winter | Dec–Feb | 1° | 6° |
| Spring | Mar–May | 7° | 16° |
| Summer | Jun–Aug | 14° | 25° |
| Autumn | Sep–Nov | 7° | 14° |
How much rain does Mainz get?
Mainz gets 580 mm of precipitation in an average year, spread over about 144 days with measurable rain. That is fewer rainy days than 96% of Germany.
July is the wettest month, with 61 mm. April is the driest, with 38 mm. December has the most rainy days, about 14.
The longest dry spell in the last five years lasted 21 days, to August 26, 2025.
From October 2025 to September 2026 Mainz got 389 mm of rain, against a normal of 580 mm for those months. February 2026 had the most, with 70 mm.
Mainz weather by month
Mainz weather in January
In January, Mainz averages a high of 5°C and a low of 0°C. It gets 41 mm of precipitation over about 13 rainy days. Estimated sunshine is 19% of daylight hours, derived from ERA5 cloud cover. The January record high is 16°C (2025) and the record low is -17°C (1979).
Mainz weather in February
In February, Mainz averages a high of 7°C and a low of 0°C. It gets 40 mm of precipitation over about 12 rainy days. Estimated sunshine is 27% of daylight hours, derived from ERA5 cloud cover. The February record high is 18°C (2021) and the record low is -17°C (1985).
Mainz weather in March
In March, Mainz averages a high of 12°C and a low of 3°C. It gets 41 mm of precipitation over about 12 rainy days. Estimated sunshine is 39% of daylight hours, derived from ERA5 cloud cover. The March record high is 26°C (1989) and the record low is -10°C (2005).
Mainz weather in April
In April, Mainz averages a high of 16°C and a low of 6°C. It gets 38 mm of precipitation over about 11 rainy days. Estimated sunshine is 42% of daylight hours, derived from ERA5 cloud cover. The April record high is 29°C (2007) and the record low is -4°C (1986).
Mainz weather in May
In May, Mainz averages a high of 21°C and a low of 10°C. It gets 55 mm of precipitation over about 12 rainy days. Estimated sunshine is 39% of daylight hours, derived from ERA5 cloud cover. The May record high is 34°C (2005) and the record low is -1°C (1979). May is one of the most comfortable months to visit.
Mainz weather in June
In June, Mainz averages a high of 24°C and a low of 13°C. It gets 53 mm of precipitation over about 11 rainy days. Estimated sunshine is 42% of daylight hours, derived from ERA5 cloud cover. The June record high is 39°C (2026) and the record low is 3°C (1991). June is one of the most comfortable months to visit.
Mainz weather in July
In July, Mainz averages a high of 26°C and a low of 16°C. It gets 61 mm of precipitation over about 12 rainy days. Estimated sunshine is 40% of daylight hours, derived from ERA5 cloud cover. The July record high is 39°C (2019) and the record low is 6°C (1984).
Mainz weather in August
In August, Mainz averages a high of 26°C and a low of 15°C. It gets 51 mm of precipitation over about 11 rainy days. Estimated sunshine is 41% of daylight hours, derived from ERA5 cloud cover. The August record high is 39°C (2003) and the record low is 4°C (1978). August is one of the most comfortable months to visit.
Mainz weather in September
In September, Mainz averages a high of 21°C and a low of 11°C. It gets 46 mm of precipitation over about 10 rainy days. Estimated sunshine is 43% of daylight hours, derived from ERA5 cloud cover. The September record high is 32°C (1973) and the record low is 2°C (1979). September is one of the most comfortable months to visit.
Mainz weather in October
In October, Mainz averages a high of 14°C and a low of 7°C. It gets 51 mm of precipitation over about 13 rainy days. Estimated sunshine is 25% of daylight hours, derived from ERA5 cloud cover. The October record high is 27°C (1985) and the record low is -4°C (2012).
Mainz weather in November
In November, Mainz averages a high of 9°C and a low of 4°C. It gets 47 mm of precipitation over about 13 rainy days. Estimated sunshine is 21% of daylight hours, derived from ERA5 cloud cover. The November record high is 22°C (2020) and the record low is -7°C (1983).
Mainz weather in December
In December, Mainz averages a high of 6°C and a low of 1°C. It gets 55 mm of precipitation over about 14 rainy days. Estimated sunshine is 15% of daylight hours, derived from ERA5 cloud cover. The December record high is 16°C (2022) and the record low is -17°C (2009).
Sunshine, humidity and wind in Mainz
September is the sunniest month in Mainz, with estimated sunshine of 43% of daylight hours from ERA5 cloud cover. December is the cloudiest, at 15%. The annual cloud-cover estimate is 33% of daylight hours; it is not a measurement of sunshine duration. Mainz is sunnier than 69% of Germany.
Humidity peaks in December at 88% and is lowest in July at 59%.
Mainz has about 6 days a year above 32°C. Mainz is hotter than 88% of Germany.
First and last freeze in Mainz
The first fall freeze in Mainz typically comes around November 7, and the last spring freeze around April 6. That leaves a frost-free growing season of about 215 days.
Mainz weather records
These records cover MAINZ-LERCHENBERG (ZDF) during 1970–2026. Earlier records or other stations in the city may differ.
The hottest temperature on record at the Mainz station is 39°C, on June 27, 2026. The coldest is -17°C, on January 1, 1979.
The wettest day in the available station history brought 82 mm of precipitation, on May 23, 1978.
45 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 Mainz
The most comfortable time to visit is typically May to June and August to September, when daytime highs sit near 23°C.
Winter (December–February) is chilly, with average highs around 5°C and lows near 0°C.
Spring (March–May) is mild, with average highs around 16°C and lows near 7°C.
Summer (June–August) is warm, with average highs around 25°C and lows near 14°C.
Autumn (September–November) is mild, with average highs around 15°C and lows near 7°C.
Monthly climate
| Month | Average low | Average high | Precip | Rain days | Humidity | Estimated sunshine | Record high | Record low |
|---|---|---|---|---|---|---|---|---|
| January | 0° | 5° | 41 mm | 13 | 85% | 19% | 16° | -17° |
| February | 0° | 7° | 40 mm | 12 | 79% | 27% | 18° | -17° |
| March | 3° | 12° | 41 mm | 12 | 69% | 39% | 26° | -10° |
| April | 6° | 16° | 38 mm | 11 | 63% | 42% | 29° | -4° |
| May | 10° | 21° | 55 mm | 12 | 65% | 39% | 34° | -1° |
| June | 13° | 24° | 53 mm | 11 | 60% | 42% | 39° | 3° |
| July | 16° | 26° | 61 mm | 12 | 59% | 40% | 39° | 6° |
| August | 15° | 26° | 51 mm | 11 | 63% | 41% | 39° | 4° |
| September | 11° | 21° | 46 mm | 10 | 70% | 43% | 32° | 2° |
| October | 7° | 14° | 51 mm | 13 | 84% | 25% | 27° | -4° |
| November | 4° | 9° | 47 mm | 13 | 87% | 21% | 22° | -7° |
| December | 1° | 6° | 55 mm | 14 | 88% | 15% | 16° | -17° |
Station: MAINZ-LERCHENBERG (ZDF), 5 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.
Mainz climate questions
How much rain does Mainz get?
Mainz gets 580 mm of precipitation in an average year, over about 144 rainy days.
What is the wettest month in Mainz?
July is the wettest month in Mainz, with 61 mm. April is the driest, with 38 mm.
How many rainy days does Mainz have a year?
Mainz has about 144 days with measurable rain in an average year. December has the most, about 14.
What is the hottest month in Mainz?
July is the warmest month in Mainz, with an average high of 26°C.
What is the coldest month in Mainz?
January is the coldest month in Mainz, with an average low of 0°C.
What is the record high temperature in Mainz?
Within the available 1970–2026 station history, the record high at the Mainz station is 39°C, set on June 27, 2026. The record low is -17°C, on January 1, 1979.
What is the sunniest month in Mainz?
September is the sunniest month in Mainz, with estimated sunshine of 43% of daylight hours from ERA5 cloud cover. December is the cloudiest.
When is the first frost in Mainz?
The first fall freeze in Mainz typically comes around November 7. The last spring freeze is around April 6.
What is the best time to visit Mainz?
The most comfortable time to visit is typically May to June and August to September, when daytime highs sit near 23°C.