September weather forecastGränichen, Switzerland
September
Weather in September
The first month of the autumn, September, is still a refreshing month in Gränichen, Switzerland, with an average temperature fluctuating between 8.2°C (46.8°F) and 18.8°C (65.8°F).Temperature
September is characterized by a slight reduction in average high-temperature, easing from a warm 23.3°C (73.9°F) in August to a comfortable 18.8°C (65.8°F). Throughout the month of September, Gränichen reports a steady low-temperature average of 8.2°C (46.8°F).Humidity
In September, the average relative humidity in Gränichen, Switzerland, is 81%.Rainfall
The month with the least rainfall is September, when the rain falls for 14.5 days and typically collects 45mm (1.77") of precipitation.Snowfall
In Gränichen, Switzerland, snow does not fall in June through September.Daylight
The average length of the day in September is 12h and 34min.On the first day of the month, sunrise is at 06:47 and sunset at 20:07. On the last day of September, sunrise is at 07:25 and sunset at 19:08 CEST.
Sunshine
In Gränichen, the average sunshine in September is 8.9h.UV index
In Gränichen, Switzerland, the average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a moderate health risk from unprotected exposure to Sun's UV rays for the ordinary person.Note: In September, the maximum UV index of 4 translates into these guidelines:
Take necessary precautions - Suggestions to elude sunburn are provided. Being in direct Sun during midday can be harmful due to intense solar radiation; take precautions. Consider a wide-brim hat essential for effective sun defense covering your face, neck, and eyes.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Gränichen, Switzerland
- Average high temperature in September: 18.8°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 (2.9°C).
- Average low temperature in September: 8.2°C
The months with the highest average low temperature are July and August (11.8°C).
The coldest month (with the lowest average low temperature) is February (-3.4°C).
Average pressure in September
Gränichen, Switzerland
- Average pressure in September: 1018.6mbar
The month with the highest atmospheric pressure is December (1020.9mbar).
The month with the lowest atmospheric pressure is April (1015.6mbar).
Average wind speed in September
Gränichen, Switzerland
- Average wind speed in September: 6.4km/h
The windiest month (with the highest average wind speed) is March (8.8km/h).
The calmest month (with the lowest average wind speed) is August (5.9km/h).
Average humidity in September
Gränichen, Switzerland
- Average humidity in September: 81%
The month with the highest relative humidity is January (88%).
The months with the lowest relative humidity are April and July (78%).
Average rainfall in September
Gränichen, Switzerland
- Average rainfall in September: 45mm
The wettest month (with the highest rainfall) is May (106mm).
The driest month (with the least rainfall) is September (45mm).
Average rainfall days in September
Gränichen, Switzerland
- Average rainfall days in September: 14.5 days
The month with the highest number of rainy days is May (22.4 days).
The month with the least rainy days is February (10.6 days).
Average snowfall in September
Gränichen, Switzerland
- Average snowfall in September: 0mm
The month with the highest snowfall is February (153mm).
The months with the least snowfall are June, July, August and September (0mm).
Average snowfall days in September
Gränichen, Switzerland
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (9.7 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Gränichen, Switzerland
- 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 54min
The month with the most sunshine is August (Average sunshine: 10h and 24min).
The month with the least sunshine is December (Average sunshine: 5h and 0min).
Average sunshine days in September
Gränichen, Switzerland
- Average sunshine days in September: 12.2 days
The month with the most sunshine days is October (15 days).
The month with the least sunshine days is May (6.6 days).
Average UV index in September
Gränichen, Switzerland
- Average UV index in September: 4
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
Gränichen, Switzerland
- Average cloud cover in September: 34
The month with the most cloud cover is January (Cloud cover 49).
The month with the least cloud cover is August (Cloud cover 32).
Average visibility in September
Gränichen, Switzerland
- 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).
