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
September marks a gentle change in average high-temperature, declining from August's enjoyable 17.3°C (63.1°F) to a moderate 13.2°C (55.8°F). San Bernardino's nights in September cool down to an average low-temperature of 3.9°C (39°F).Humidity
In September, the average relative humidity is 84%.Rainfall
In San Bernardino, in September, it is raining for 16.1 days, with typically 38mm (1.5") of accumulated precipitation. In San Bernardino, during the entire year, the rain falls for 170.7 days and collects up to 698mm (27.48") of precipitation.Snowfall
June through September are months without snowfall.Daylight
In San Bernardino, the average length of the day in September is 12h and 33min.On the first day of the month, sunrise is at 06:44 and sunset at 20:02. On the last day of September, in San Bernardino, sunrise is at 07:21 and sunset at 19:04 CEST.
Sunshine
In San Bernardino, the average sunshine in September is 8.6h.UV index
In September, the average daily maximum UV index in San Bernardino is 2. A UV Index reading of 2, and below, represents a low health risk from exposure to the Sun's UV radiation for average individuals.Note: A maximum daily UV index of 2 during September morphs into the following directions:
It is important to always shield children, babies, and individuals with sensitive skin from prolonged exposure to the sun. Being exposed to the midday Sun can have harmful effects due to strong UV radiation; always take precautions. Combat UV radiation's detrimental effects with sun-safe clothing and UV-blocking eyewear.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in San Bernardino in September?
What is the average humidity in September in San Bernardino?
How many days does it rain in September in San Bernardino?
When it does not snow in San Bernardino?
Does it snow in San Bernardino in September?
How many hours of daylight does San Bernardino have in September?
What time are sunrise and sunset in September in San Bernardino?
How many hours of sunshine does San Bernardino have in September?
How high is the UV index in September in San Bernardino?
Average temperature in September
San Bernardino, Switzerland
- Average high temperature in September: 13.2°C
The warmest month (with the highest average high temperature) is July (17.7°C).
The month with the lowest average high temperature is January (-2.6°C).
- Average low temperature in September: 3.9°C
The months with the highest average low temperature are July and August (6.3°C).
The coldest month (with the lowest average low temperature) is February (-11.1°C).
Average pressure in September
San Bernardino, Switzerland
- Average pressure in September: 1018.3mbar
The month with the highest atmospheric pressure is December (1020.8mbar).
The month with the lowest atmospheric pressure is April (1015.4mbar).
Average wind speed in September
San Bernardino, Switzerland
- Average wind speed in September: 6.4km/h
The windiest month (with the highest average wind speed) is November (8.4km/h).
The calmest month (with the lowest average wind speed) is August (6km/h).
Average humidity in September
San Bernardino, Switzerland
- Average humidity in September: 84%
The month with the highest relative humidity is March (93%).
The month with the lowest relative humidity is July (81%).
Average rainfall in September
San Bernardino, Switzerland
- Average rainfall in September: 38mm
The wettest month (with the highest rainfall) is August (100mm).
The driest months (with the least rainfall) are January and February (32mm).
Average rainfall days in September
San Bernardino, Switzerland
- Average rainfall days in September: 16.1 days
The month with the highest number of rainy days is July (24 days).
The month with the least rainy days is January (5.8 days).
Average snowfall in September
San Bernardino, Switzerland
- Average snowfall in September: 0mm
The month with the highest snowfall is December (326mm).
The months with the least snowfall are June, July, August and September (0mm).
Average snowfall days in September
San Bernardino, Switzerland
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (17 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
San Bernardino, Switzerland
- Average daylight in September: 12h and 3min
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: 8h and 4min
The month with the most sunshine is July (Average sunshine: 10h and 12min).
The months with the least sunshine are January, February and December (Average sunshine: 4h and 48min).
Average sunshine days in September
San Bernardino, Switzerland
- Average sunshine days in September: 11.3 days
The month with the most sunshine days is October (16.7 days).
The month with the least sunshine days is July (4.4 days).
Average UV index in September
San Bernardino, 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 and February (UV index 1).
Average cloud cover in September
San Bernardino, Switzerland
- Average cloud cover in September: 45
The month with the most cloud cover is March (Cloud cover 55).
The months with the least cloud cover are July and August (Cloud cover 42).
Average visibility in September
San Bernardino, Switzerland
- Average visibility in September: 7km
The months with the highest visibility are June, July and August (8km).
The month with the lowest visibility is January (5km).
