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
The transition from August to September brings an average high-temperature of a still moderately hot 75.4°F (24.1°C), barely different from August's 80.4°F (26.9°C). Dawson experiences a nighttime temperature average of 55.9°F (13.3°C) during September.Humidity
In September, the average relative humidity is 76%.Rainfall
In Dawson, in September, during 11.8 rainfall days, 2.95" (75mm) of precipitation is typically accumulated. In Dawson, during the entire year, the rain falls for 131.7 days and collects up to 26.65" (677mm) of precipitation.Snowfall
In Dawson, Iowa, snow does not fall in June through September.Daylight
In Dawson, the average length of the day in September is 12h and 28min.On the first day of the month, sunrise is at 6:43 am and sunset at 7:49 pm. On the last day of September, sunrise is at 7:13 am and sunset at 6:59 pm CDT.
Sunshine
In September, the average sunshine is 9.3h.UV index
In September, the average daily maximum UV index is 4. A UV Index of 3 to 5 symbolizes a medium vulnerability from unsafe exposure to UV radiation for the average person.Note: The average daily UV index of 4 in September transforms into the following instructions:
Make use of precautions - Shielding skin and eyes from injury is a requirement. It's recommended to limit sun exposure when its radiation is at its peak during midday. To cut down UV radiation exposure by about half, sport a wide-brim hat.
Frequently asked questions
What is the average September temperature in Dawson?
What is the average humidity in September in Dawson?
How many days does it rain in September in Dawson?
When it does not snow in Dawson?
Does it snow in Dawson in September?
What is the average length of the day in September in Dawson?
What time are sunrise and sunset in September in Dawson?
How long on average sun shines in September in Dawson?
What is the UV index intensity in September in Dawson?
Average temperature in September
Dawson, IA
- Average high temperature in September: 75.4°F
The warmest month (with the highest average high temperature) is July (82°F).
The month with the lowest average high temperature is January (27.1°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°F).
Average pressure in September
Dawson, 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
Dawson, IA
- Average wind speed in September: 8.1mph
The windiest month (with the highest average wind speed) is April (10.5mph).
The calmest months (with the lowest average wind speed) are July and August (7mph).
Average humidity in September
Dawson, IA
- Average humidity in September: 76%
The month with the highest relative humidity is January (83%).
The month with the lowest relative humidity is October (69%).
Average rainfall in September
Dawson, IA
- Average rainfall in September: 2.95"
The wettest month (with the highest rainfall) is May (4.17").
The driest month (with the least rainfall) is January (0.91").
Average rainfall days in September
Dawson, IA
- Average rainfall days in September: 11.8 days
The month with the highest number of rainy days is May (17.5 days).
The month with the least rainy days is February (3.8 days).
Average snowfall in September
Dawson, IA
- Average snowfall in September: 0"
The month with the highest snowfall is January (3.74").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Dawson, IA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (10.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Dawson, IA
- Average daylight in September: 12h and 3min
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 12min).
- Average sunshine in September: 9h and 2min
The month with the most sunshine is July (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 4h and 12min).
Average sunshine days in September
Dawson, IA
- Average sunshine days in September: 16.2 days
The months with the most sunshine days are October, November and December (18.9 days).
The month with the least sunshine days is June (10.6 days).
Average UV index in September
Dawson, IA
- Average UV index in September: 4
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January, February, October, November and December (UV index 2).
Average cloud cover in September
Dawson, IA
- Average cloud cover in September: 29
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 29).
Average visibility in September
Dawson, IA
- Average visibility in September: 6mi
The months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is January (5mi).
Dawson, Iowa, USA
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