September weather forecastAltena, Germany
September
Weather in September
September, the first month of the autumn in Altena, is still a comfortable month, with an average temperature fluctuating between 9.6°C (49.3°F) and 18.1°C (64.6°F).Temperature
Altena observes a small decrease in the average high-temperature with the arrival of September, falling from August's agreeable 22.4°C (72.3°F) to a comfortable 18.1°C (64.6°F). During September, the temperature tends to dip to an average of 9.6°C (49.3°F) at night.Humidity
In Altena, the average relative humidity in September is 81%.Rainfall
In Altena, Germany, during September, the rain falls for 14.6 days and regularly aggregates up to 34mm (1.34") of precipitation. In Altena, during the entire year, the rain falls for 173.8 days and collects up to 605mm (23.82") of precipitation.Snowfall
In Altena, Germany, snow does not fall in June through September.Daylight
In September, the average length of the day in Altena is 12h and 38min.On the first day of the month, sunrise is at 06:43 and sunset at 20:15. On the last day of September, sunrise is at 07:29 and sunset at 19:09 CEST.
Sunshine
The average sunshine in September is 8.1h.UV index
In Altena, the average daily maximum UV index in September is 3. A UV Index estimate of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV rays for the average person.Note: The daily maximum UV index of 3 in September interprets into the following advice:
Make use of precautions - Suggestions to resist sunburn are communicated. When the Sun is at its strongest around midday, find shade and limit exposure. By wearing a generously brimmed hat, you can cut UV radiation exposure significantly.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Altena, Germany
- Average high temperature in September: 18.1°C
The warmest month (with the highest average high temperature) is August (22.4°C).
The month with the lowest average high temperature is January (3.2°C).
- Average low temperature in September: 9.6°C
The month with the highest average low temperature is August (12.6°C).
The coldest month (with the lowest average low temperature) is January (-0.9°C).
Average pressure in September
Altena, Germany
- Average pressure in September: 1017.7mbar
The month with the highest atmospheric pressure is September (1017.7mbar).
The month with the lowest atmospheric pressure is November (1013.4mbar).
Average wind speed in September
Altena, Germany
- Average wind speed in September: 9.6km/h
The windiest month (with the highest average wind speed) is February (14km/h).
The calmest month (with the lowest average wind speed) is August (9.4km/h).
Average humidity in September
Altena, Germany
- Average humidity in September: 81%
The month with the highest relative humidity is December (91%).
The months with the lowest relative humidity are April and August (76%).
Average rainfall in September
Altena, Germany
- Average rainfall in September: 34mm
The wettest month (with the highest rainfall) is December (73mm).
The driest month (with the least rainfall) is April (29mm).
Average rainfall days in September
Altena, Germany
- Average rainfall days in September: 14.6 days
The month with the highest number of rainy days is July (18.7 days).
The month with the least rainy days is February (9.4 days).
Average snowfall in September
Altena, Germany
- Average snowfall in September: 0mm
The month with the highest snowfall is January (143mm).
The months with the least snowfall are June, July, August and September (0mm).
Average snowfall days in September
Altena, Germany
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (11.7 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Altena, 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 12min).
Average sunshine days in September
Altena, Germany
- Average sunshine days in September: 13.4 days
The month with the most sunshine days is April (14.4 days).
The month with the least sunshine days is December (9.5 days).
Average UV index in September
Altena, Germany
- 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, March, November and December (UV index 2).
Average cloud cover in September
Altena, Germany
- Average cloud cover in September: 44
The month with the most cloud cover is December (Cloud cover 70).
The month with the least cloud cover is August (Cloud cover 39).
Average visibility in September
Altena, Germany
- Average visibility in September: 8km
The months with the highest visibility are April, June and August (9km).
The months with the lowest visibility are January and December (7km).
