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's presence records an average high-temperature of a still warm 75.4°F (24.1°C), closely mirroring August's climate. Throughout the month of September, the nighttime temperature dips to an average of 56.3°F (13.5°C).Humidity
In Rapids City, the average relative humidity in September is 76%.Rainfall
In Rapids City, in September, it is raining for 6.9 days, with typically 0.75" (19mm) of accumulated precipitation. Throughout the year, in Rapids City, there are 99.4 rainfall days, and 9.57" (243mm) of precipitation is accumulated.Snowfall
Months with snowfall in Rapids City are January through April, September through December. September is the first month it typically snows. Throughout September, in the average 0.1 snowfall days, it receives 0.04" (1mm) of snow. In Rapids City, during the entire year, snow falls for 24.5 days and aggregates up to 4.09" (104mm) of snow.Daylight
In September, the average length of the day is 12h and 28min.On the first day of September, sunrise is at 6:28 am and sunset at 7:34 pm. On the last day of the month, sunrise is at 6:57 am and sunset at 6:44 pm CDT.
Sunshine
In September, the average sunshine in Rapids City is 9.1h.UV index
In Rapids City, the average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV rays for average individuals.Note: In September, the UV index of 4 transforms into the following advice:
Make use of precautions - Suggestions to resist sunburn are communicated. Avoiding direct sunlight during midday hours helps reduce the risk from intense UV radiation. Sunglasses providing both UVA and UVB protection are non-negotiable on sunlit days. Take warning! The intensity of the Sun's UV radiation can be nearly amplified twice due to snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in Rapids City in September?
What is the average humidity in September in Rapids City?
How many days does it rain in September in Rapids City?
When does it start to snow in Rapids City?
How many hours of daylight does Rapids City have in September?
What time are sunrise and sunset in September in Rapids City?
How long on average sun shines in September in Rapids City?
What is the UV index reading in September in Rapids City?
Average temperature in September
Rapids City, IL
- Average high temperature in September: 75.4°F
The warmest month (with the highest average high temperature) is July (81.7°F).
The month with the lowest average high temperature is January (28.2°F).
- Average low temperature in September: 56.3°F
The month with the highest average low temperature is July (64.8°F).
The coldest month (with the lowest average low temperature) is January (15.4°F).
Average pressure in September
Rapids City, IL
- 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 (29.91"Hg).
Average wind speed in September
Rapids City, IL
- Average wind speed in September: 7.8mph
The windiest month (with the highest average wind speed) is April (10.6mph).
The calmest month (with the lowest average wind speed) is August (6.7mph).
Average humidity in September
Rapids City, IL
- Average humidity in September: 76%
The months with the highest relative humidity are January and July (83%).
The month with the lowest relative humidity is October (71%).
Average rainfall in September
Rapids City, IL
- Average rainfall in September: 0.75"
The wettest month (with the highest rainfall) is May (1.61").
The driest month (with the least rainfall) is December (0.35").
Average rainfall days in September
Rapids City, IL
- Average rainfall days in September: 6.9 days
The month with the highest number of rainy days is May (13.4 days).
The month with the least rainy days is January (3.2 days).
Average snowfall in September
Rapids City, IL
- Average snowfall in September: 0.04"
The month with the highest snowfall is January (1.26").
The months with the least snowfall are May, June, July and August (0").
Average snowfall days in September
Rapids City, IL
- Average snowfall days in September: 0.1 days
The month with the highest number of snowfall days is January (7.2 days).
The months with the least snowfall days are May, June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Rapids City, IL
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in September: 9h and 1min
The month with the most sunshine is July (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 3h and 54min).
Average sunshine days in September
Rapids City, IL
- Average sunshine days in September: 20.9 days
The month with the most sunshine days is December (22.4 days).
The month with the least sunshine days is June (14.4 days).
Average UV index in September
Rapids City, IL
- 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 January (UV index 1).
Average cloud cover in September
Rapids City, IL
- Average cloud cover in September: 31
The month with the most cloud cover is January (Cloud cover 58).
The month with the least cloud cover is August (Cloud cover 30).
Average visibility in September
Rapids City, IL
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Rapids City, Illinois, USA
Weather forecast for your location
2. Allow the app to use your location