September weather forecastDeep River, IA
September
Weather in September
September, the first month of the autumn in Deep River, is still a warm month, with an average temperature fluctuating between 55.6°F (13.1°C) and 74.7°F (23.7°C).Temperature
Deep River records a mild change in average high-temperature during September, easing from a warm 80.4°F (26.9°C) in August to a still moderately hot 74.7°F (23.7°C). Nighttime temperature lowers to an average of 55.6°F (13.1°C) in September.Humidity
The average relative humidity in September in Deep River is 77%.Rainfall
In Deep River, in September, it is raining for 12.8 days, with typically 2.8" (71mm) of accumulated precipitation. In Deep River, during the entire year, the rain falls for 145.5 days and collects up to 30.39" (772mm) of precipitation.Snowfall
June through September are months without snowfall in Deep River.Daylight
In September, the average length of the day in Deep River is 12h and 28min.On the first day of September, sunrise is at 6:36 am and sunset at 7:42 pm. On the last day of the month, sunrise is at 7:06 am and sunset at 6:52 pm CDT.
Sunshine
The average sunshine in September is 9.4h.UV index
In Deep River, Iowa, the average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV radiation for the average person.Note: The maximum UV index of 4 during September translates into these guidelines:
Be vigilant - Preventing sunburn is recommended. Stay safe from the Sun's strongest UV rays by limiting exposure during midday. For effective sun eye protection, rely on sunglasses certified for UVA and UVB resistance.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Deep River, IA
- Average high temperature in September: 74.7°F
The warmest month (with the highest average high temperature) is July (81.1°F).
The month with the lowest average high temperature is January (27.1°F).
- Average low temperature in September: 55.6°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 (14.7°F).
Average pressure in September
Deep River, 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 (29.89"Hg).
Average wind speed in September
Deep River, IA
- Average wind speed in September: 8mph
The windiest months (with the highest average wind speed) are January and April (10.7mph).
The calmest months (with the lowest average wind speed) are July and August (7mph).
Average humidity in September
Deep River, IA
- Average humidity in September: 77%
The months with the highest relative humidity are January and July (84%).
The month with the lowest relative humidity is October (72%).
Average rainfall in September
Deep River, IA
- Average rainfall in September: 2.8"
The wettest month (with the highest rainfall) is May (4.57").
The driest month (with the least rainfall) is January (1.18").
Average rainfall days in September
Deep River, IA
- Average rainfall days in September: 12.8 days
The month with the highest number of rainy days is June (18.9 days).
The month with the least rainy days is February (5 days).
Average snowfall in September
Deep River, IA
- Average snowfall in September: 0"
The month with the highest snowfall is February (5.24").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Deep River, 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 June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Deep River, 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 12min).
- Average sunshine in September: 9h and 24min
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
Deep River, IA
- Average sunshine days in September: 15.7 days
The month with the most sunshine days is November (18.5 days).
The month with the least sunshine days is June (8.3 days).
Average UV index in September
Deep River, IA
- Average UV index in September: 4
The months with the highest UV index are June and July (UV index 6).
The month with the lowest UV index is January (UV index 1).
Average cloud cover in September
Deep River, IA
- Average cloud cover in September: 30
The month with the most cloud cover is January (Cloud cover 56).
The month with the least cloud cover is August (Cloud cover 29).
Average visibility in September
Deep River, 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).
