September weather forecastCastro, Switzerland
September
Weather in September
September, the first month of the autumn in Castro, is still a cool month, with an average temperature varying between 2.8°C (37°F) and 11.6°C (52.9°F).Temperature
Castro's weather subtly changes with the onset of September, barely falling from a mild 15.8°C (60.4°F) in August to a fresh 11.6°C (52.9°F). Castro's average low-temperature is measured at an icy 2.8°C (37°F) during September.Humidity
In Castro, Switzerland, the average relative humidity in September is 85%.Rainfall
In Castro, during September, the rain falls for 20.9 days and regularly aggregates up to 94mm (3.7") of precipitation. Throughout the year, there are 200.1 rainfall days, and 1619mm (63.74") of precipitation is accumulated.Snowfall
January through May, September through December are months with snowfall in Castro. September is the first month it typically snows. Throughout September, in the average 0.4 snowfall days, it receives 6mm (0.24") of snow. Throughout the year, there are 114.5 snowfall days, and 3819mm (150.35") of snow is accumulated.Daylight
The average length of the day in September is 12h and 33min.On the first day of September, sunrise is at 06:45 and sunset at 20:03. On the last day of the month, sunrise is at 07:22 and sunset at 19:06 CEST.
Sunshine
The average sunshine in September is 7.4h.UV index
The average daily maximum UV index in September in Castro is 2. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from unprotected exposure to Sun's UV rays for average individuals.Note: The UV index of 2 during September leads to these advisories:
Extended exposure to the sun should always be avoided by children, infants, and those with sensitive skin. Midday Sun has the strongest UV rays, making it crucial to limit exposure and find shade. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim. Guard yourself! Snow reflection can almost double the UV radiation from the Sun.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Castro, Switzerland
- Average high temperature in September: 11.6°C
The warmest month (with the highest average high temperature) is July (16.2°C).
The month with the lowest average high temperature is January (-3.9°C).
- Average low temperature in September: 2.8°C
The month with the highest average low temperature is July (6.3°C).
The coldest month (with the lowest average low temperature) is February (-12.7°C).
Average pressure in September
Castro, Switzerland
- Average pressure in September: 1018.2mbar
The month with the highest atmospheric pressure is December (1020.8mbar).
The month with the lowest atmospheric pressure is April (1015.3mbar).
Average wind speed in September
Castro, Switzerland
- Average wind speed in September: 7.7km/h
The windiest month (with the highest average wind speed) is December (10km/h).
The calmest month (with the lowest average wind speed) is August (7.1km/h).
Average humidity in September
Castro, Switzerland
- Average humidity in September: 85%
The month with the highest relative humidity is March (94%).
The month with the lowest relative humidity is July (82%).
Average rainfall in September
Castro, Switzerland
- Average rainfall in September: 94mm
The wettest month (with the highest rainfall) is August (205mm).
The driest month (with the least rainfall) is February (71mm).
Average rainfall days in September
Castro, Switzerland
- Average rainfall days in September: 20.9 days
The month with the highest number of rainy days is July (27.2 days).
The month with the least rainy days is February (5.3 days).
Average snowfall in September
Castro, Switzerland
- Average snowfall in September: 6mm
The month with the highest snowfall is December (734mm).
The months with the least snowfall are June, July and August (0mm).
Average snowfall days in September
Castro, Switzerland
- Average snowfall days in September: 0.4 days
The month with the highest number of snowfall days is January (20.8 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in September /
Average sunshine in September
Castro, Switzerland
- Average daylight in September: 12h and 30min
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 42min).
- Average sunshine in September: 7h and 24min
The month with the most sunshine is July (Average sunshine: 9h and 24min).
The month with the least sunshine is November (Average sunshine: 3h and 42min).
Average sunshine days in September
Castro, Switzerland
- Average sunshine days in September: 6.7 days
The month with the most sunshine days is October (12.1 days).
The month with the least sunshine days is July (2.3 days).
Average UV index in September
Castro, Switzerland
- Average UV index in September: 2
The months with the highest UV index are June and July (UV index 4).
The months with the lowest UV index are January, February, March, April, November and December (UV index 1).
Average cloud cover in September
Castro, Switzerland
- Average cloud cover in September: 56
The months with the most cloud cover are March and April (Cloud cover 68).
The month with the least cloud cover is July (Cloud cover 50).
Average visibility in September
Castro, Switzerland
- Average visibility in September: 7km
The months with the highest visibility are June and July (8km).
The months with the lowest visibility are January, February, March and April (5km).
