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
Colwell's weather in September involves a mild decrease in the average high-temperature, moving down slightly from August's warm 77.5°F (25.3°C) to a pleasant 72.1°F (22.3°C). The temperature dips to an average of 53.4°F (11.9°C) during September nights.Humidity
In Colwell, the average relative humidity in September is 79%.Rainfall
In September, in Colwell, the rain falls for 11.2 days. Throughout September, 2.09" (53mm) of precipitation is accumulated. In Colwell, during the entire year, the rain falls for 136.1 days and collects up to 27.32" (694mm) of precipitation.Snowfall
June through September are months without snowfall in Colwell.Daylight
In September, the average length of the day in Colwell, Iowa, is 12h and 29min.On the first day of the month, sunrise is at 6:35 am and sunset at 7:44 pm. On the last day of September, sunrise is at 7:07 am and sunset at 6:52 pm CDT.
Sunshine
The average sunshine in September in Colwell, Iowa, is 8.9h.UV index
In September, the average daily maximum UV index is 4. A UV Index estimate of 3 to 5 represents a medium health hazard from unsafe exposure to UV radiation for average individuals.Note: A maximum high daily UV index of 4 during September translates into the following directions:
Ensure safety - Recommendations to avert sunburn are presented. For health reasons, it's advisable to reduce direct sun exposure during peak hours around midday. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
Frequently asked questions
What are the temperatures in Colwell in September?
What is the average humidity in September in Colwell?
How much does it rain in Colwell in September?
When it does not snow in Colwell?
Does it snow in Colwell in September?
How many hours of daylight does Colwell have in September?
What time are sunrise and sunset in September in Colwell?
How many hours of sunshine does Colwell have in September?
How high is the UV index in September in Colwell?
Average temperature in September
Colwell, IA
- Average high temperature in September: 72.1°F
The warmest month (with the highest average high temperature) is July (79.2°F).
The month with the lowest average high temperature is January (22.6°F).
- Average low temperature in September: 53.4°F
The month with the highest average low temperature is July (62.6°F).
The coldest month (with the lowest average low temperature) is January (10.6°F).
Average pressure in September
Colwell, IA
- Average pressure in September: 30.01"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).
Average wind speed in September
Colwell, IA
- Average wind speed in September: 8.3mph
The windiest month (with the highest average wind speed) is April (10.7mph).
The calmest months (with the lowest average wind speed) are July and August (7.1mph).
Average humidity in September
Colwell, IA
- Average humidity in September: 79%
The month with the highest relative humidity is January (88%).
The month with the lowest relative humidity is October (72%).
Average rainfall in September
Colwell, IA
- Average rainfall in September: 2.09"
The wettest month (with the highest rainfall) is June (4.17").
The driest month (with the least rainfall) is January (1.14").
Average rainfall days in September
Colwell, IA
- Average rainfall days in September: 11.2 days
The month with the highest number of rainy days is May (19.2 days).
The month with the least rainy days is February (4.3 days).
Average snowfall in September
Colwell, IA
- Average snowfall in September: 0"
The month with the highest snowfall is February (6.5").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Colwell, IA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (14.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Colwell, IA
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 6min).
- Average sunshine in September: 8h and 5min
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
Colwell, IA
- Average sunshine days in September: 16.8 days
The month with the most sunshine days is October (17.5 days).
The month with the least sunshine days is June (9.3 days).
Average UV index in September
Colwell, 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, February and December (UV index 1).
Average cloud cover in September
Colwell, 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
Colwell, IA
- Average visibility in September: 6mi
The months with the highest visibility are March, April, May, June, September, October and November (6mi).
The months with the lowest visibility are January, February, July, August and December (5mi).
Colwell, Iowa, USA
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