September weather forecastMertzen, France
September
Weather in September
September, the first month of the autumn in Mertzen, is still a comfortable month, with temperature in the range of an average high of 18.5°C (65.3°F) and an average low of 8.8°C (47.8°F).Temperature
September witnesses a gentle descent in average high-temperature, descending from August's agreeable 22.6°C (72.7°F) to a comfortable 18.5°C (65.3°F). In September, the average low-temperature is a frosty 8.8°C (47.8°F).Humidity
In Mertzen, the average relative humidity in September is 83%.Rainfall
September is the month with the least rainfall in Mertzen. Rain falls for 13.6 days and accumulates 36mm (1.42") of precipitation.Snowfall
In Mertzen, snow does not fall in June through September.Daylight
In Mertzen, the average length of the day in September is 12h and 34min.On the first day of the month, sunrise is at 06:50 and sunset at 20:11. On the last day of September, sunrise is at 07:29 and sunset at 19:12 CEST.
Sunshine
In Mertzen, France, the average sunshine in September is 8.4h.UV index
In Mertzen, the average daily maximum UV index in September is 3. A UV Index reading of 3 to 5 represents a moderate health risk from unprotected exposure to Sun's UV rays for the average person.Note: The maximum daily UV index, 3 in September, converts into the following recommendations:
Put precautions into practice - Guidance to elude sunburn is provided. Considering the strength of solar radiation at midday, one should avoid direct Sun exposure. Enhance your sun protection with tightly woven, yet airy clothing.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Mertzen, France
- Average high temperature in September: 18.5°C
The warmest month (with the highest average high temperature) is July (22.7°C).
The month with the lowest average high temperature is January (3.2°C).
- Average low temperature in September: 8.8°C
The month with the highest average low temperature is August (12.3°C).
The coldest month (with the lowest average low temperature) is January (-1.8°C).
Average pressure in September
Mertzen, France
- Average pressure in September: 1018.6mbar
The month with the highest atmospheric pressure is December (1020.6mbar).
The month with the lowest atmospheric pressure is November (1015.5mbar).
Average wind speed in September
Mertzen, France
- Average wind speed in September: 8.1km/h
The windiest month (with the highest average wind speed) is February (12.1km/h).
The calmest month (with the lowest average wind speed) is August (7.4km/h).
Average humidity in September
Mertzen, France
- Average humidity in September: 83%
The months with the highest relative humidity are January and December (88%).
The month with the lowest relative humidity is April (80%).
Average rainfall in September
Mertzen, France
- Average rainfall in September: 36mm
The wettest month (with the highest rainfall) is June (86mm).
The driest month (with the least rainfall) is September (36mm).
Average rainfall days in September
Mertzen, France
- Average rainfall days in September: 13.6 days
The month with the highest number of rainy days is May (20.7 days).
The month with the least rainy days is February (12.4 days).
Average snowfall in September
Mertzen, France
- Average snowfall in September: 0mm
The month with the highest snowfall is January (114mm).
The months with the least snowfall are June, July, August and September (0mm).
Average snowfall days in September
Mertzen, France
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (10.7 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Mertzen, France
- Average daylight in September: 12h and 36min
The month with the longest days is June (Average daylight: 15h and 54min).
The month with the shortest days is December (Average daylight: 8h and 30min).
- Average sunshine in September: 8h and 24min
The months with the most sunshine are July and August (Average sunshine: 9h and 54min).
The month with the least sunshine is December (Average sunshine: 4h and 12min).
Average sunshine days in September
Mertzen, France
- Average sunshine days in September: 13.3 days
The month with the most sunshine days is October (15.5 days).
The month with the least sunshine days is June (7.3 days).
Average UV index in September
Mertzen, France
- Average UV index in September: 3
The months with the highest UV index are June and July (UV index 5).
The months with the lowest UV index are January, February, October, November and December (UV index 2).
Average cloud cover in September
Mertzen, France
- Average cloud cover in September: 37
The month with the most cloud cover is January (Cloud cover 59).
The month with the least cloud cover is August (Cloud cover 34).
Average visibility in September
Mertzen, France
- Average visibility in September: 8km
The months with the highest visibility are March, April, July and August (9km).
The months with the lowest visibility are January, February, May, June, September, October, November and December (8km).
