Mainz, Rheinland-Pfalz Weather by Month and Climate Averages

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.

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. The sun is out about 19% of daylight hours. 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. The sun is out about 27% of daylight hours. 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. The sun is out about 39% of daylight hours. 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. The sun is out about 42% of daylight hours. 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. The sun is out about 39% of daylight hours. 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. The sun is out about 42% of daylight hours. 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. The sun is out about 40% of daylight hours. 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. The sun is out about 41% of daylight hours. 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. The sun is out about 43% of daylight hours. 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. The sun is out about 25% of daylight hours. 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. The sun is out about 21% of daylight hours. 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. The sun is out about 15% of daylight hours. 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 sunshine about 43% of daylight hours. December is the cloudiest, at 15%. Over the year the sun shines about 33% of daylight hours. 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 89% 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

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 on record brought 82 mm of rain, 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.

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?

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 sunshine about 43% of daylight hours. 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.