Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
September
Weather in September
Temperature
In September, the meteorological conditions change slightly, with the average high-temperature moving from an agreeable 21.6°C (70.9°F) in August to a comfortable 16.9°C (62.4°F). During September, Unterterzen observes a consistent average nighttime temperature of 7°C (44.6°F).Humidity
The average relative humidity in September in Unterterzen is 81%.Rainfall
In Unterterzen, in September, it is raining for 11.6 days, with typically 41mm (1.61") of accumulated precipitation. Throughout the year, there are 129.6 rainfall days, and 714mm (28.11") of precipitation is accumulated.Snowfall
In Unterterzen, 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 September in Unterterzen, sunrise is at 06:42 and sunset at 20:02. On the last day of the month, sunrise is at 07:21 and sunset at 19:04 CEST.
Sunshine
The average sunshine in September is 8.9h.UV index
In September, the average daily maximum UV index is 3. A UV Index estimate of 3 to 5 represents a moderate health risk from exposure to the Sun's UV rays for average individuals.Note: A maximum UV index of 3 in September translates into the following recommendations:
Put precautions into practice - Ensuring skin and eye safety is a necessity. The Sun's UV radiation is especially harmful around midday, so reduce exposure and stay safe. In bright sunlight, prioritize sunglasses that grant protection from UVA and UVB radiation.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the temperature in September in Unterterzen?
What is the average humidity in September in Unterterzen?
How many days does it rain in September in Unterterzen?
When it does not snow in Unterterzen?
Does it snow in Unterterzen in September?
How many hours of daylight does Unterterzen have in September?
When are sunrise and sunset in September in Unterterzen?
How many hours of sunshine does Unterterzen have in September?
What is the UV index intensity in September in Unterterzen?
Average temperature in September
Unterterzen, Switzerland
- Average high temperature in September: 16.9°C
The warmest month (with the highest average high temperature) is August (21.6°C).
The month with the lowest average high temperature is January (1.4°C).
- Average low temperature in September: 7°C
The month with the highest average low temperature is August (10.5°C).
The coldest month (with the lowest average low temperature) is February (-5.8°C).
Average pressure in September
Unterterzen, Switzerland
- Average pressure in September: 1018.6mbar
The month with the highest atmospheric pressure is December (1020.8mbar).
The month with the lowest atmospheric pressure is April (1015.6mbar).
Average wind speed in September
Unterterzen, Switzerland
- Average wind speed in September: 6.2km/h
The windiest month (with the highest average wind speed) is December (8km/h).
The calmest month (with the lowest average wind speed) is August (6.1km/h).
Average humidity in September
Unterterzen, Switzerland
- Average humidity in September: 81%
The month with the highest relative humidity is February (89%).
The months with the lowest relative humidity are July and August (78%).
Average rainfall in September
Unterterzen, Switzerland
- Average rainfall in September: 41mm
The wettest month (with the highest rainfall) is May (91mm).
The driest month (with the least rainfall) is November (36mm).
Average rainfall days in September
Unterterzen, Switzerland
- Average rainfall days in September: 11.6 days
The month with the highest number of rainy days is May (15.3 days).
The month with the least rainy days is February (6 days).
Average snowfall in September
Unterterzen, Switzerland
- Average snowfall in September: 0mm
The month with the highest snowfall is January (417mm).
The months with the least snowfall are June, July, August and September (0mm).
Average snowfall days in September
Unterterzen, Switzerland
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (12 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Unterterzen, Switzerland
- Average daylight in September: 12h and 4min
The month with the longest days is June (Average daylight: 15h and 48min).
The month with the shortest days is December (Average daylight: 8h and 36min).
- Average sunshine in September: 8h and 5min
The month with the most sunshine is July (Average sunshine: 10h and 12min).
The month with the least sunshine is December (Average sunshine: 4h and 48min).
Average sunshine days in September
Unterterzen, Switzerland
- Average sunshine days in September: 16.5 days
The month with the most sunshine days is October (19.3 days).
The months with the least sunshine days are May and June (13.8 days).
Average UV index in September
Unterterzen, Switzerland
- 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 November and December (UV index 1).
Average cloud cover in September
Unterterzen, Switzerland
- Average cloud cover in September: 37
The month with the most cloud cover is February (Cloud cover 51).
The month with the least cloud cover is August (Cloud cover 34).
Average visibility in September
Unterterzen, Switzerland
- Average visibility in September: 8km
The month with the highest visibility is July (9km).
The months with the lowest visibility are January and February (7km).
