September weather forecastBellevue, IA
September
Weather in September
September, the first month of the autumn in Bellevue, is also an agreeable month, with an average temperature ranging between max 73°F (22.8°C) and min 54°F (12.2°C).Temperature
With the onset of September, the average high-temperature subtly recedes from August's warm 79°F (26.1°C) to an agreeable 73°F (22.8°C). Bellevue observes an average nighttime temperature of 54°F (12.2°C) during September.Humidity
In Bellevue, the average relative humidity in September is 79%.Rainfall
In September, the rain falls for 12.4 days. Throughout September, 2.4" (61mm) of precipitation is accumulated. In Bellevue, during the entire year, the rain falls for 145.6 days and collects up to 28.9" (734mm) of precipitation.Snowfall
In Bellevue, snow does not fall in May through September.Daylight
In September, the average length of the day in Bellevue is 12h and 28min.On the first day of the month, sunrise is at 6:27 am and sunset at 7:35 pm. On the last day of September, in Bellevue, sunrise is at 6:58 am and sunset at 6:44 pm CDT.
Sunshine
In September, the average sunshine is 9.1h.UV index
The average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a moderate health risk from unprotected exposure to Sun's UV rays for ordinary individuals.Note: A daily maximum UV index of 4 in September translates into the following instructions:
Exercise prevention - Protecting skin and eyes from harm is required. The Sun's radiation is especially intense around midday; try to stay in shade during this period. Prioritize a wide-brim hat for comprehensive sun defense for your face, neck, eyes, and ears.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Bellevue, IA
- Average high temperature in September: 73°F
The warmest month (with the highest average high temperature) is July (79.9°F).
The month with the lowest average high temperature is January (25.7°F).
- Average low temperature in September: 54°F
The month with the highest average low temperature is July (63.5°F).
The coldest month (with the lowest average low temperature) is January (13.1°F).
Average pressure in September
Bellevue, IA
- Average pressure in September: 30.02"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).
Average wind speed in September
Bellevue, IA
- Average wind speed in September: 7.6mph
The windiest month (with the highest average wind speed) is April (10.3mph).
The calmest month (with the lowest average wind speed) is August (6.6mph).
Average humidity in September
Bellevue, IA
- Average humidity in September: 79%
The month with the highest relative humidity is January (87%).
The month with the lowest relative humidity is October (75%).
Average rainfall in September
Bellevue, IA
- Average rainfall in September: 2.4"
The wettest month (with the highest rainfall) is May (4.13").
The driest month (with the least rainfall) is January (1.22").
Average rainfall days in September
Bellevue, IA
- Average rainfall days in September: 12.4 days
The month with the highest number of rainy days is May (19.8 days).
The month with the least rainy days is February (4.5 days).
Average snowfall in September
Bellevue, IA
- Average snowfall in September: 0"
The month with the highest snowfall is January (4.61").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in September
Bellevue, IA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (10.6 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Bellevue, IA
- Average daylight in September: 12h and 30min
The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in September: 9h and 6min
The month with the most sunshine is July (Average sunshine: 9h and 54min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).
Average sunshine days in September
Bellevue, IA
- Average sunshine days in September: 15.9 days
The month with the most sunshine days is November (19 days).
The month with the least sunshine days is May (9.5 days).
Average UV index in September
Bellevue, IA
- Average UV index in September: 4
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in September
Bellevue, IA
- Average cloud cover in September: 32
The month with the most cloud cover is January (Cloud cover 61).
The months with the least cloud cover are August and September (Cloud cover 32).
Average visibility in September
Bellevue, IA
- Average visibility in September: 6mi
The months with the highest visibility are February, March, April, May, June, August, September, October, November and December (6mi).
The months with the lowest visibility are January and July (5mi).
