September weather forecastMainz, Germany
September
Weather in September
September brings the onset of autumn, with a notable drop in temperatures, reaching a high of 20.2°C (68.4°F). The shift from the scorching summer climate to the moderate autumn weather is much awaited. Rainfall amounts decrease to 22mm (0.87"), alongside a reduction in daylight and sunshine hours, providing a respite from the heat. Meanwhile, wind speeds pick up slightly, ushering in the cooler autumn breeze. The transformation of foliage begins, adding vibrant colours to Mainz's cityscape.Temperature
A moderate decline in average high-temperatures is noted in Mainz in September, moving from a moderately hot 24.9°C (76.8°F) in August to an agreeable 20.2°C (68.4°F). During September, the average low-temperature is recorded at a fresh 11.1°C (52°F).Humidity
The average relative humidity in September in Mainz is 73%.Rainfall
In Mainz, in September, it is raining for 9.6 days, with typically 22mm (0.87") of accumulated precipitation. Throughout the year, there are 146.5 rainfall days, and 366mm (14.41") of precipitation is accumulated.Snowfall
In Mainz, Germany, snow does not fall in May through October.Daylight
In September, the average length of the day is 12h and 37min.On the first day of the month, sunrise is at 06:42 and sunset at 20:10. On the last day of September, sunrise is at 07:26 and sunset at 19:07 CEST.
Sunshine
In Mainz, the average sunshine in September is 8.6h.UV index
In September, the average daily maximum UV index in Mainz is 4. A UV Index reading of 3 to 5 represents a moderate health risk from exposure to the Sun's UV radiation for average individuals.Note: The daily maximum UV index of 4 in September interprets into the following advice:
Take necessary precautions - Suggestions to elude sunburn are provided. The best time to avoid the Sun's harmful UV radiation is during midday when it's most potent. Employ a hat with a wide brim for robust protection, cutting UV exposure by half.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Mainz, Germany
- Average high temperature in September: 20.2°C
The warmest month (with the highest average high temperature) is July (25.2°C).
The month with the lowest average high temperature is January (3.7°C).
- Average low temperature in September: 11.1°C
The month with the highest average low temperature is August (14.7°C).
The coldest month (with the lowest average low temperature) is January (-0.5°C).
Average pressure in September
Mainz, Germany
- Average pressure in September: 1018.1mbar
The month with the highest atmospheric pressure is December (1018.3mbar).
The month with the lowest atmospheric pressure is November (1014.5mbar).
Average wind speed in September
Mainz, Germany
- Average wind speed in September: 8.9km/h
The windiest months (with the highest average wind speed) are February and March (11.9km/h).
The calmest month (with the lowest average wind speed) is August (8.7km/h).
Average humidity in September
Mainz, Germany
- Average humidity in September: 73%
The month with the highest relative humidity is December (87%).
The months with the lowest relative humidity are July and August (67%).
Average rainfall in September
Mainz, Germany
- Average rainfall in September: 22mm
The wettest month (with the highest rainfall) is July (45mm).
The driest month (with the least rainfall) is April (19mm).
Average rainfall days in September
Mainz, Germany
- Average rainfall days in September: 9.6 days
The month with the highest number of rainy days is July (14.7 days).
The months with the least rainy days are February and September (9.6 days).
Average snowfall in September
Mainz, Germany
- Average snowfall in September: 0mm
The month with the highest snowfall is February (39mm).
The months with the least snowfall are May, June, July, August, September and October (0mm).
Average snowfall days in September
Mainz, Germany
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (5.4 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Mainz, Germany
- Average daylight in September: 12h and 36min
The month with the longest days is June (Average daylight: 16h and 18min).
The month with the shortest days is December (Average daylight: 8h and 12min).
- Average sunshine in September: 8h and 36min
The month with the most sunshine is July (Average sunshine: 10h and 24min).
The month with the least sunshine is December (Average sunshine: 3h and 36min).
Average sunshine days in September
Mainz, Germany
- Average sunshine days in September: 17.9 days
The month with the most sunshine days is September (17.9 days).
The month with the least sunshine days is December (12 days).
Average UV index in September
Mainz, Germany
- Average UV index in September: 4
The months with the highest UV index are May, June, July and August (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in September
Mainz, Germany
- Average cloud cover in September: 37
The month with the most cloud cover is December (Cloud cover 63).
The month with the least cloud cover is August (Cloud cover 33).
Average visibility in September
Mainz, Germany
- Average visibility in September: 9km
The months with the highest visibility are March, April, May, June, July, August and September (9km).
The months with the lowest visibility are January, February, October, November and December (8km).
