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
Observing a mild shift, the average high-temperature during September reduces from August's warm 77.2°F (25.1°C) to an enjoyable 66.9°F (19.4°C). In the month of September, Bellevue witnesses a consistent average low-temperature of 45.7°F (7.6°C).Humidity
In September, the average relative humidity is 41%.Rainfall
In Bellevue, during September, the rain falls for 4.2 days and regularly aggregates up to 0.28" (7mm) of precipitation. In Bellevue, Idaho, during the entire year, the rain falls for 85.1 days and collects up to 12.01" (305mm) of precipitation.Snowfall
January through May, September through December are months with snowfall in Bellevue. September is the first month it typically snows in Bellevue. Throughout September, in the average 0.2 snowfall days, it receives 0.08" (2mm) of snow. Throughout the year, there are 72.5 snowfall days, and 57.05" (1449mm) of snow is accumulated.Daylight
The average length of the day in September is 12h and 29min.On the first day of September, sunrise is at 7:01 am and sunset at 8:11 pm. On the last day of the month, sunrise is at 7:34 am and sunset at 7:19 pm MDT.
Sunshine
In Bellevue, the average sunshine in September is 9.5h.UV index
In Bellevue, the average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a medium vulnerability from unsafe exposure to UV radiation for ordinary individuals.Note: A typical high UV index of 4 in September suggests the following recommendations:
Prioritize safety - The need to safeguard skin and eyes from harm is emphasized. The mid-day Sun emits the most powerful UV radiation, so seek shade and minimize exposure. Wearing a wide-brim hat can block approximately 50% of UV radiation, protecting the eyes. Remember this! The UV radiation of the Sun can be nearly doubled by the reflective properties of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the average September temperature in Bellevue?
What is the average humidity in September in Bellevue?
How much does it rain in Bellevue in September?
When does it start snowing in Bellevue?
What is the average length of the day in September in Bellevue?
When are sunrise and sunset in September in Bellevue?
How many hours of sunshine does Bellevue have in September?
How high is the UV index in September in Bellevue?
Average temperature in September
Bellevue, ID
- Average high temperature in September: 66.9°F
The warmest month (with the highest average high temperature) is July (77.7°F).
The month with the lowest average high temperature is December (25.7°F).
- Average low temperature in September: 45.7°F
The months with the highest average low temperature are July and August (52.3°F).
The coldest month (with the lowest average low temperature) is January (9.5°F).
Average pressure in September
Bellevue, ID
- Average pressure in September: 29.95"Hg
The month with the highest atmospheric pressure is January (30.28"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).
Average wind speed in September
Bellevue, ID
- Average wind speed in September: 6.4mph
The windiest month (with the highest average wind speed) is July (7.3mph).
The calmest month (with the lowest average wind speed) is December (4.7mph).
Average humidity in September
Bellevue, ID
- Average humidity in September: 41%
The month with the highest relative humidity is February (86%).
The month with the lowest relative humidity is August (34%).
Average rainfall in September
Bellevue, ID
- Average rainfall in September: 0.28"
The wettest month (with the highest rainfall) is February (1.77").
The driest month (with the least rainfall) is July (0.2").
Average rainfall days in September
Bellevue, ID
- Average rainfall days in September: 4.2 days
The month with the highest number of rainy days is May (12.8 days).
The month with the least rainy days is August (3.4 days).
Average snowfall in September
Bellevue, ID
- Average snowfall in September: 0.08"
The month with the highest snowfall is February (13.74").
The months with the least snowfall are June, July and August (0").
Average snowfall days in September
Bellevue, ID
- Average snowfall days in September: 0.2 days
The month with the highest number of snowfall days is December (14.2 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in September /
Average sunshine in September
Bellevue, ID
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 24min).
The month with the shortest days is December (Average daylight: 9h and 0min).
- Average sunshine in September: 9h and 3min
The month with the most sunshine is July (Average sunshine: 12h and 6min).
The month with the least sunshine is January (Average sunshine: 5h and 36min).
Average sunshine days in September
Bellevue, ID
- Average sunshine days in September: 24.6 days
The month with the most sunshine days is August (25.8 days).
The month with the least sunshine days is April (12.4 days).
Average UV index in September
Bellevue, ID
- Average UV index in September: 4
The month with the highest UV index is July (UV index 6).
The month with the lowest UV index is February (UV index 1).
Average cloud cover in September
Bellevue, ID
- Average cloud cover in September: 14
The month with the most cloud cover is February (Cloud cover 44).
The month with the least cloud cover is July (Cloud cover 9).
Average visibility in September
Bellevue, ID
- Average visibility in September: 6mi
The months with the highest visibility are April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January and February (4mi).
Bellevue, Idaho, USA
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