September weather forecastGrefrath, Germany
September
Weather in September
September, the first month of the autumn in Grefrath, is still a comfortable month, with an average temperature fluctuating between 19.5°C (67.1°F) and 11.6°C (52.9°F).Temperature
As Grefrath enters September, the average high-temperature subtly lowers from the a warm 23.3°C (73.9°F) of August to an enjoyable 19.5°C (67.1°F). During September, the temperature tends to dip to an average of 11.6°C (52.9°F) at night.Humidity
In September, the average relative humidity is 77%.Rainfall
In Grefrath, in September, during 13 rainfall days, 31mm (1.22") of precipitation is typically accumulated. In Grefrath, during the entire year, the rain falls for 175.6 days and collects up to 456mm (17.95") of precipitation.Snowfall
April through October are months without snowfall in Grefrath, Germany.Daylight
In Grefrath, the average length of the day in September is 12h and 38min.On the first day of September in Grefrath, sunrise is at 06:48 and sunset at 20:20. On the last day of the month, sunrise is at 07:34 and sunset at 19:14 CEST.
Sunshine
In Grefrath, the average sunshine in September is 8.1h.UV index
In September, the average daily maximum UV index in Grefrath is 4. A UV Index of 3 to 5 symbolizes a medium vulnerability from unprotected exposure to Sun's UV rays for the average person.Note: The average daily UV index of 4 in September transforms into the following instructions:
Take necessary precautions - Defending against sun damage is advocated. The midday Sun can be dangerous due to its intense radiation; always find shade and reduce exposure. To cut down UV radiation exposure by about half, sport a wide-brim hat.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Grefrath, Germany
- Average high temperature in September: 19.5°C
The warmest months (with the highest average high temperature) are July and August (23.3°C).
The month with the lowest average high temperature is January (4.8°C).
- Average low temperature in September: 11.6°C
The month with the highest average low temperature is August (14.4°C).
The coldest month (with the lowest average low temperature) is January (1°C).
Average pressure in September
Grefrath, Germany
- Average pressure in September: 1017.4mbar
The month with the highest atmospheric pressure is September (1017.4mbar).
The month with the lowest atmospheric pressure is November (1012.8mbar).
Average wind speed in September
Grefrath, Germany
- Average wind speed in September: 11.4km/h
The windiest month (with the highest average wind speed) is December (17km/h).
The calmest months (with the lowest average wind speed) are July and August (11.2km/h).
Average humidity in September
Grefrath, Germany
- Average humidity in September: 77%
The month with the highest relative humidity is December (87%).
The months with the lowest relative humidity are April and August (73%).
Average rainfall in September
Grefrath, Germany
- Average rainfall in September: 31mm
The wettest months (with the highest rainfall) are June, July and December (46mm).
The driest month (with the least rainfall) is April (24mm).
Average rainfall days in September
Grefrath, Germany
- Average rainfall days in September: 13 days
The month with the highest number of rainy days is July (17.7 days).
The month with the least rainy days is April (12.2 days).
Average snowfall in September
Grefrath, Germany
- Average snowfall in September: 0mm
The month with the highest snowfall is January (38mm).
The months with the least snowfall are April, May, June, July, August, September and October (0mm).
Average snowfall days in September
Grefrath, Germany
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (4.4 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Grefrath, Germany
- Average daylight in September: 12h and 36min
The month with the longest days is June (Average daylight: 16h and 30min).
The month with the shortest days is December (Average daylight: 8h and 0min).
- Average sunshine in September: 8h and 6min
The month with the most sunshine is August (Average sunshine: 9h and 30min).
The month with the least sunshine is December (Average sunshine: 3h and 36min).
Average sunshine days in September
Grefrath, Germany
- Average sunshine days in September: 14.3 days
The month with the most sunshine days is October (15.1 days).
The month with the least sunshine days is June (10.3 days).
Average UV index in September
Grefrath, Germany
- Average UV index in September: 4
The months with the highest UV index are 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
Grefrath, Germany
- Average cloud cover in September: 41
The month with the most cloud cover is December (Cloud cover 61).
The month with the least cloud cover is August (Cloud cover 38).
Average visibility in September
Grefrath, Germany
- Average visibility in September: 9km
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (9km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (9km).
