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
A modest decline in the average high-temperature is seen during September, decreasing from a refreshing 13.8°C (56.8°F) in August to a chilly 9.8°C (49.6°F). Grengiols experiences an average temperature drop to a cold 1.5°C (34.7°F) during September nights.Humidity
In Grengiols, Switzerland, the average relative humidity in September is 86%.Rainfall
In September, in Grengiols, the rain falls for 17.5 days. Throughout September, 36mm (1.42") of precipitation is accumulated. In Grengiols, Switzerland, during the entire year, the rain falls for 148 days and collects up to 606mm (23.86") of precipitation.Snowfall
Months with snowfall are January through December. In Grengiols, Switzerland, during September, snow falls for 2.2 days and regularly aggregates up to 43mm (1.69") of snow. In Grengiols, during the entire year, snow falls for 124.7 days and aggregates up to 1943mm (76.5") of snow.Daylight
In Grengiols, the average length of the day in September is 12h and 33min.On the first day of September in Grengiols, sunrise is at 06:48 and sunset at 20:06. On the last day of the month, sunrise is at 07:25 and sunset at 19:09 CEST.
Sunshine
The average sunshine in September in Grengiols is 6.9h.UV index
In Grengiols, the average daily maximum UV index in September is 2. A UV Index value of 2, and less, symbolizes a minimal health hazard from exposure to the Sun's UV radiation for average individuals.Note: The UV index of 2 during September translates into the following guidance:
Children necessitate constant protection from sunlight, unlike the majority, who can remain under the sun for about an hour without burning. Being exposed to the midday Sun can have harmful effects due to strong UV radiation; always take precautions. Outfit yourself in sun-safe attire, like long sleeves, pants, a hat, and UV-blocking sunglasses. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in Grengiols in September?
What is the average humidity in September in Grengiols?
How many days does it rain in September in Grengiols?
How many days does it snow in September in Grengiols?
What is the average length of the day in September in Grengiols?
When is the sunrise / sunset in September in Grengiols?
How many hours of sunshine does Grengiols have in September?
What is the UV index intensity in September in Grengiols?
Average temperature in September
Grengiols, Switzerland
- Average high temperature in September: 9.8°C
The warmest month (with the highest average high temperature) is July (14.1°C).
The month with the lowest average high temperature is January (-4.2°C).
- Average low temperature in September: 1.5°C
The months with the highest average low temperature are July and August (4.3°C).
The coldest month (with the lowest average low temperature) is February (-13.8°C).
Average pressure in September
Grengiols, Switzerland
- Average pressure in September: 1018.2mbar
The month with the highest atmospheric pressure is December (1020.9mbar).
The month with the lowest atmospheric pressure is April (1015.2mbar).
Average wind speed in September
Grengiols, Switzerland
- Average wind speed in September: 6.6km/h
The windiest month (with the highest average wind speed) is December (9.5km/h).
The calmest month (with the lowest average wind speed) is August (5.9km/h).
Average humidity in September
Grengiols, Switzerland
- Average humidity in September: 86%
The months with the highest relative humidity are March and April (93%).
The months with the lowest relative humidity are July and August (84%).
Average rainfall in September
Grengiols, Switzerland
- Average rainfall in September: 36mm
The wettest months (with the highest rainfall) are June and August (74mm).
The driest month (with the least rainfall) is January (20mm).
Average rainfall days in September
Grengiols, Switzerland
- Average rainfall days in September: 17.5 days
The month with the highest number of rainy days is July (25.3 days).
The month with the least rainy days is December (2.5 days).
Average snowfall in September
Grengiols, Switzerland
- Average snowfall in September: 43mm
The month with the highest snowfall is November (472mm).
The month with the least snowfall is July (2mm).
Average snowfall days in September
Grengiols, Switzerland
- Average snowfall days in September: 2.2 days
The month with the highest number of snowfall days is March (19.5 days).
The month with the least snowfall days is July (0.2 days).
Average daylight in September /
Average sunshine in September
Grengiols, Switzerland
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 42min).
The month with the shortest days is December (Average daylight: 8h and 42min).
- Average sunshine in September: 6h and 5min
The month with the most sunshine is July (Average sunshine: 8h and 36min).
The month with the least sunshine is February (Average sunshine: 3h and 30min).
Average sunshine days in September
Grengiols, Switzerland
- Average sunshine days in September: 8.4 days
The month with the most sunshine days is December (18.5 days).
The month with the least sunshine days is August (3.9 days).
Average UV index in September
Grengiols, Switzerland
- Average UV index in September: 2
The months with the highest UV index are June and July (UV index 3).
The months with the lowest UV index are January, February, March, April, October, November and December (UV index 1).
Average cloud cover in September
Grengiols, Switzerland
- Average cloud cover in September: 57
The month with the most cloud cover is May (Cloud cover 69).
The months with the least cloud cover are July and August (Cloud cover 52).
Average visibility in September
Grengiols, Switzerland
- Average visibility in September: 7km
The month with the highest visibility is July (8km).
The months with the lowest visibility are January, February, March, April, May and November (6km).
