September weather forecastRockdale, IA
September
Weather in September
The first month of the autumn, September, is still a pleasant month in Rockdale, Iowa, with an average temperature fluctuating between 72.5°F (22.5°C) and 53.2°F (11.8°C).Temperature
In Rockdale, the average high-temperature in September slightly decreases from a warm 78.6°F (25.9°C) in August to an agreeable 72.5°F (22.5°C). During the nights in September, an average low-temperature of 53.2°F (11.8°C) is observed.Humidity
The average relative humidity in September in Rockdale is 80%.Rainfall
In Rockdale, during September, the rain falls for 11.4 days and regularly aggregates up to 2.6" (66mm) of precipitation. Throughout the year, in Rockdale, Iowa, there are 135.3 rainfall days, and 27.4" (696mm) of precipitation is accumulated.Snowfall
In Rockdale, snow does not fall in May through September.Daylight
In Rockdale, the average length of the day in September is 12h and 28min.On the first day of September, sunrise is at 6:28 am and sunset at 7:36 pm. On the last day of the month, sunrise is at 6:59 am and sunset at 6:45 pm CDT.
Sunshine
In September, the average sunshine is 8.9h.UV index
In Rockdale, the average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a moderate health risk from exposure to the Sun's UV radiation for average individuals.Note: The maximum UV index, 4 during September, leads to the following recommendations:
Exercise prevention - Warding off sunburn is urged. It's recommended to limit sun exposure when its radiation is at its peak during midday. To mitigate harm from sun exposure, pick sunglasses offering UVA and UVB defense.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Rockdale, IA
- Average high temperature in September: 72.5°F
The warmest month (with the highest average high temperature) is July (79.7°F).
The month with the lowest average high temperature is January (25°F).
- Average low temperature in September: 53.2°F
The month with the highest average low temperature is July (62.8°F).
The coldest month (with the lowest average low temperature) is January (12.4°F).
Average pressure in September
Rockdale, 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
Rockdale, IA
- Average wind speed in September: 7.8mph
The windiest month (with the highest average wind speed) is April (10.4mph).
The calmest months (with the lowest average wind speed) are July and August (6.8mph).
Average humidity in September
Rockdale, IA
- Average humidity in September: 80%
The months with the highest relative humidity are January and February (87%).
The month with the lowest relative humidity is October (76%).
Average rainfall in September
Rockdale, IA
- Average rainfall in September: 2.6"
The wettest months (with the highest rainfall) are May and June (3.7").
The driest months (with the least rainfall) are January and February (1.14").
Average rainfall days in September
Rockdale, IA
- Average rainfall days in September: 11.4 days
The month with the highest number of rainy days is May (17.7 days).
The month with the least rainy days is February (4.4 days).
Average snowfall in September
Rockdale, IA
- Average snowfall in September: 0"
The month with the highest snowfall is January (4.88").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in September
Rockdale, IA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (12.8 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
Rockdale, 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 6min).
- Average sunshine in September: 8h and 54min
The months with the most sunshine are July and August (Average sunshine: 9h and 42min).
The month with the least sunshine is January (Average sunshine: 3h and 30min).
Average sunshine days in September
Rockdale, IA
- Average sunshine days in September: 17.2 days
The months with the most sunshine days are November and December (17.5 days).
The month with the least sunshine days is June (10.3 days).
Average UV index in September
Rockdale, IA
- Average UV index in September: 4
The month with the highest UV index is June (UV index 6).
The months with the lowest UV index are January, November and December (UV index 1).
Average cloud cover in September
Rockdale, IA
- Average cloud cover in September: 33
The month with the most cloud cover is January (Cloud cover 63).
The month with the least cloud cover is August (Cloud cover 32).
Average visibility in September
Rockdale, 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).
