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
Weather in September
Temperature
September marks a gentle change in average high-temperature, declining from August's agreeable 21.4°C (70.5°F) to a refreshing 17.1°C (62.8°F). September nights are marked by an average low-temperature of 7.5°C (45.5°F).Humidity
In September, the average relative humidity is 78%.Rainfall
In Grono, Switzerland, during September, the rain falls for 12.2 days and regularly aggregates up to 32mm (1.26") of precipitation. Throughout the year, there are 137.8 rainfall days, and 669mm (26.34") of precipitation is accumulated.Snowfall
In Grono, snow does not fall in May through October.Daylight
In Grono, the average length of the day in September is 12h and 32min.On the first day of September in Grono, sunrise is at 06:44 and sunset at 20:02. On the last day of the month, sunrise is at 07:21 and sunset at 19:05 CEST.
Sunshine
The average sunshine in September is 9.4h.UV index
The average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a medium health hazard from unsafe exposure to UV radiation for the ordinary person.Note: The maximum daily UV index of 4 in September converts into the following recommendations:
Prioritize safety - Recommendations to avert sunburn are shared. To guard against the harmful effects of the Sun, minimize exposure during midday. A wide-brimmed hat is a shield, deflecting up to 50% of harmful UV radiation from eyes. Mark this! Snow reflection can nearly double the UV radiation intensity from the Sun.
Frequently asked questions
What are the temperatures in Grono in September?
What is the average humidity in September in Grono?
How many days does it rain in September in Grono?
When it does not snow in Grono?
How many hours of daylight does Grono have in September?
What time are sunrise and sunset in September in Grono?
How many hours of sunshine does Grono have in September?
What is the UV index intensity in September in Grono?
Average temperature in September
Grono, Switzerland
- Average high temperature in September: 17.1°C
The warmest month (with the highest average high temperature) is July (21.9°C).
The month with the lowest average high temperature is January (1.6°C).
- Average low temperature in September: 7.5°C
The months with the highest average low temperature are July and August (11.1°C).
The coldest month (with the lowest average low temperature) is February (-5.1°C).
Average pressure in September
Grono, Switzerland
- Average pressure in September: 1017.8mbar
The month with the highest atmospheric pressure is December (1020.6mbar).
The month with the lowest atmospheric pressure is April (1015.1mbar).
Average wind speed in September
Grono, Switzerland
- Average wind speed in September: 6.4km/h
The windiest month (with the highest average wind speed) is February (7.4km/h).
The calmest month (with the lowest average wind speed) is November (5.7km/h).
Average humidity in September
Grono, Switzerland
- Average humidity in September: 78%
The month with the highest relative humidity is November (83%).
The month with the lowest relative humidity is July (75%).
Average rainfall in September
Grono, Switzerland
- Average rainfall in September: 32mm
The wettest month (with the highest rainfall) is November (118mm).
The driest month (with the least rainfall) is January (15mm).
Average rainfall days in September
Grono, Switzerland
- Average rainfall days in September: 12.2 days
The month with the highest number of rainy days is June (15.9 days).
The month with the least rainy days is January (5.8 days).
Average snowfall in September
Grono, Switzerland
- Average snowfall in September: 0mm
The month with the highest snowfall is February (12mm).
The months with the least snowfall are May, June, July, August, September and October (0mm).
Average snowfall days in September
Grono, Switzerland
- Average snowfall days in September: 0.1 days
The month with the highest number of snowfall days is January (1.3 days).
The months with the least snowfall days are May, June, July, August and October (0 days).
Average daylight in September /
Average sunshine in September
Grono, 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: 9h and 2min
The month with the most sunshine is July (Average sunshine: 11h and 30min).
The month with the least sunshine is November (Average sunshine: 5h and 30min).
Average sunshine days in September
Grono, Switzerland
- Average sunshine days in September: 14.8 days
The month with the most sunshine days is January (23.7 days).
The month with the least sunshine days is July (11.3 days).
Average UV index in September
Grono, 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, March, October, November and December (UV index 2).
Average cloud cover in September
Grono, Switzerland
- Average cloud cover in September: 32
The month with the most cloud cover is November (Cloud cover 42).
The month with the least cloud cover is July (Cloud cover 25).
Average visibility in September
Grono, Switzerland
- Average visibility in September: 8km
The months with the highest visibility are January, February, March, April, May, June, July, August and December (9km).
The months with the lowest visibility are September, October and November (8km).
Grono, Switzerland
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