September weather forecastRichland, IA
September
Weather in September
The first month of the autumn, September, is still a warm month in Richland, Iowa, with an average temperature fluctuating between 56.3°F (13.5°C) and 76.1°F (24.5°C).Temperature
The beginning of September subtly marks a decrease in the average high-temperature, transitioning from a moderately hot 81.5°F (27.5°C) in August to a still warm 76.1°F (24.5°C). Richland's average low-temperature during September nights is observed to be a mild 56.3°F (13.5°C).Humidity
The average relative humidity in September is 76%.Rainfall
In Richland, during September, the rain falls for 12.1 days and regularly aggregates up to 2.48" (63mm) of precipitation. Throughout the year, there are 135.6 rainfall days, and 28.66" (728mm) of precipitation is accumulated.Snowfall
In Richland, snow does not fall in May through September.Daylight
In Richland, the average length of the day in September is 12h and 28min.On the first day of the month, sunrise is at 6:35 am and sunset at 7:40 pm. On the last day of September, sunrise is at 7:04 am and sunset at 6:51 pm CDT.
Sunshine
In Richland, the average sunshine in September is 9.3h.UV index
The average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a moderate threat to health from unsafe exposure to UV radiation for ordinary individuals.Note: In September, a daily UV index of 4 turns into the following recommendations:
Take necessary precautions - Defending against sun damage is advocated. To guard against the harmful effects of the Sun, minimize exposure during midday. In the presence of strong sunlight, it's crucial to wear sunglasses that ward off UVA and UVB rays.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Richland, IA
- Average high temperature in September: 76.1°F
The warmest month (with the highest average high temperature) is July (82.4°F).
The month with the lowest average high temperature is January (29.1°F).
- Average low temperature in September: 56.3°F
The month with the highest average low temperature is July (65.3°F).
The coldest month (with the lowest average low temperature) is January (16.5°F).
Average pressure in September
Richland, IA
- Average pressure in September: 30.02"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).
Average wind speed in September
Richland, IA
- Average wind speed in September: 8mph
The windiest month (with the highest average wind speed) is January (10.8mph).
The calmest months (with the lowest average wind speed) are July and August (7mph).
Average humidity in September
Richland, IA
- Average humidity in September: 76%
The months with the highest relative humidity are June and July (82%).
The month with the lowest relative humidity is October (71%).
Average rainfall in September
Richland, IA
- Average rainfall in September: 2.48"
The wettest month (with the highest rainfall) is May (4.45").
The driest months (with the least rainfall) are January and December (1.18").
Average rainfall days in September
Richland, IA
- Average rainfall days in September: 12.1 days
The month with the highest number of rainy days is May (17.4 days).
The month with the least rainy days is February (4.9 days).
Average snowfall in September
Richland, IA
- Average snowfall in September: 0"
The months with the highest snowfall are January and February (4.33").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in September
Richland, IA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (10.3 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
Richland, IA
- Average daylight in September: 12h and 30min
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 18min).
- Average sunshine in September: 9h and 18min
The month with the most sunshine is July (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 4h and 6min).
Average sunshine days in September
Richland, IA
- Average sunshine days in September: 16.5 days
The months with the most sunshine days are October and November (18.8 days).
The month with the least sunshine days is May (11 days).
Average UV index in September
Richland, IA
- Average UV index in September: 4
The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is January (UV index 1).
Average cloud cover in September
Richland, IA
- Average cloud cover in September: 30
The month with the most cloud cover is January (Cloud cover 55).
The months with the least cloud cover are August and September (Cloud cover 30).
Average visibility in September
Richland, IA
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, May, June, August, September, October, November and December (6mi).
The month with the lowest visibility is July (5mi).
