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Hourly Forecast
Daylight Hours
07:20
Sunrise
19:18
Sunset
Moon
Waxing Gibbous
17:34
Moonrise
01:54
Moonset
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View stargazing scoreWeather in Mainz today, September 21, 2026
Mainz stays under cloudy skies on September 21, 2026, with only brief brighter breaks. Plan for a day that feels grey more often than open. The opening hours look fair, as cloud stays near 59% around 11:00. Morning errands should face fewer weather interruptions.
Temperatures climb from an overnight low near 10°C toward a daytime high of about 19°C. Moisture in the air spans 47%-79%, with the highest values around 23:00. A lighter breeze peaks around 17:00 near 3.2 km/h.
The afternoon keeps an overcast feel, as cloud reaches about 100% around 13:00. Outdoor plans may still want a flexible backup. Expect visibility near 40.2 km, with poorer spells close to 37.3 km. Expect sunrise at 07:20, sunset at 19:18, and 11 hours 58 minutes of sunlight today overall.
Overall, Mainz on September 21, 2026 stays grey and muted, so outdoor plans may want a flexible backup even with a high near 19°C.
Frequently asked questions about weather in Mainz
How warm does it get in Mainz?
The warmest month in Mainz is August, with average high temperatures of 25°C. The average temperature during this period is around 20°C.
How cold does it get in Mainz?
The coldest month in Mainz is January, with average low temperatures of 0°C. The average temperature during this period is around 3°C.
What is the wettest time of year in Mainz?
The wettest month in Mainz is June, with an average of 70mm of precipitation.
What is the driest time of year in Mainz?
The driest month in Mainz is April, with an average of 49mm of precipitation.
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