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
A mild shift in the average high-temperature occurs in September, reducing from a moderately hot 81°F (27.2°C) in August to a still warm 74.8°F (23.8°C). In the month of September, the average low-temperature usually rests at a mild 55.9°F (13.3°C).Humidity
In Dexter, the average relative humidity in September is 76%.Rainfall
In Dexter, Iowa, during September, the rain falls for 11.5 days and regularly aggregates up to 1.89" (48mm) of precipitation. Throughout the year, in Dexter, Iowa, there are 117.3 rainfall days, and 19.09" (485mm) of precipitation is accumulated.Snowfall
June through September are months without snowfall in Dexter.Daylight
In Dexter, the average length of the day in September is 12h and 28min.On the first day of September in Dexter, sunrise is at 6:43 am and sunset at 7:49 pm. On the last day of the month, sunrise is at 7:13 am and sunset at 6:59 pm CDT.
Sunshine
In Dexter, the average sunshine in September is 9.2h.UV index
In Dexter, the average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a medium health hazard from unsafe exposure to UV radiation for the average person.Note: The daily maximum UV index of 4 in September interprets into the following advice:
Act with care - The need to guard against sun damage is communicated. The mid-day Sun emits the most powerful UV radiation, so seek shade and minimize exposure. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
Frequently asked questions
What is the usual temperature for Dexter in September?
What is the average humidity in September in Dexter?
How much does it rain in Dexter in September?
When it does not snow in Dexter?
Does it snow in Dexter in September?
How many hours of daylight does Dexter have in September?
What time are sunrise and sunset in September in Dexter?
How many hours of sunshine does Dexter have in September?
What is the UV index reading in September in Dexter?
Average temperature in September
Dexter, IA
- Average high temperature in September: 74.8°F
The warmest month (with the highest average high temperature) is July (82.2°F).
The month with the lowest average high temperature is January (28°F).
- Average low temperature in September: 55.9°F
The month with the highest average low temperature is July (64.9°F).
The coldest month (with the lowest average low temperature) is January (14.5°F).
Average pressure in September
Dexter, IA
- Average pressure in September: 30.01"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).
Average wind speed in September
Dexter, IA
- Average wind speed in September: 8.3mph
The windiest months (with the highest average wind speed) are January and February (10.6mph).
The calmest month (with the lowest average wind speed) is July (7.1mph).
Average humidity in September
Dexter, IA
- Average humidity in September: 76%
The months with the highest relative humidity are January and February (82%).
The month with the lowest relative humidity is October (70%).
Average rainfall in September
Dexter, IA
- Average rainfall in September: 1.89"
The wettest month (with the highest rainfall) is June (3.11").
The driest month (with the least rainfall) is January (0.55").
Average rainfall days in September
Dexter, IA
- Average rainfall days in September: 11.5 days
The month with the highest number of rainy days is May (16.4 days).
The month with the least rainy days is February (2.9 days).
Average snowfall in September
Dexter, IA
- Average snowfall in September: 0"
The month with the highest snowfall is February (2.76").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Dexter, IA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (8.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Dexter, IA
- 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 12min).
The month with the least sunshine is January (Average sunshine: 4h and 18min).
Average sunshine days in September
Dexter, IA
- Average sunshine days in September: 16.8 days
The month with the most sunshine days is December (22 days).
The month with the least sunshine days is May (12.1 days).
Average UV index in September
Dexter, IA
- Average UV index in September: 4
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in September
Dexter, IA
- Average cloud cover in September: 30
The month with the most cloud cover is January (Cloud cover 54).
The months with the least cloud cover are July and September (Cloud cover 30).
Average visibility in September
Dexter, IA
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, September, October, November and December (6mi).
The month with the lowest visibility is August (5mi).
Dexter, Iowa, USA
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