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
On the advent of September, Chelsea's average high-temperature exhibits a minor adjustment to a still warm 74.3°F (23.5°C) from August's 79.5°F (26.4°C). During the month of September, an average low-temperature of 55°F (12.8°C) is recorded.Humidity
In September, the average relative humidity in Chelsea is 78%.Rainfall
In Chelsea, in September, it is raining for 11.9 days, with typically 2.52" (64mm) of accumulated precipitation. Throughout the year, in Chelsea, there are 139 rainfall days, and 29.49" (749mm) of precipitation is accumulated.Snowfall
In Chelsea, snow does not fall in June through September.Daylight
In September, the average length of the day is 12h and 28min.On the first day of September in Chelsea, 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
In September, the average sunshine is 9.2h.UV index
The average daily maximum UV index in September in Chelsea is 4. A UV Index estimate of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV rays for average individuals.Note: An average maximum UV index of 4 in September leads to these recommendations:
Put precautions into practice - Protective measures against sun-induced damage are advised. Exposing oneself to the midday Sun can be harmful due to the strong UV radiation; limit your time outside. Enhance your sun protection with tightly woven, yet airy clothing.
Frequently asked questions
What is the average September temperature in Chelsea?
What is the average humidity in September in Chelsea?
How much does it rain in Chelsea in September?
When it does not snow in Chelsea?
Does it snow in Chelsea in September?
What is the average length of the day in September in Chelsea?
What time are sunrise and sunset in September in Chelsea?
How many hours of sunshine does Chelsea have in September?
How high is the UV index in September in Chelsea?
Average temperature in September
Chelsea, IA
- Average high temperature in September: 74.3°F
The warmest month (with the highest average high temperature) is July (80.8°F).
The month with the lowest average high temperature is January (25.9°F).
- Average low temperature in September: 55°F
The month with the highest average low temperature is July (64.4°F).
The coldest month (with the lowest average low temperature) is January (13.5°F).
Average pressure in September
Chelsea, IA
- Average pressure in September: 30.02"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
Chelsea, IA
- Average wind speed in September: 8.1mph
The windiest month (with the highest average wind speed) is April (10.8mph).
The calmest month (with the lowest average wind speed) is August (7mph).
Average humidity in September
Chelsea, IA
- Average humidity in September: 78%
The month with the highest relative humidity is January (85%).
The month with the lowest relative humidity is October (72%).
Average rainfall in September
Chelsea, IA
- Average rainfall in September: 2.52"
The wettest month (with the highest rainfall) is May (4.61").
The driest month (with the least rainfall) is January (1.18").
Average rainfall days in September
Chelsea, IA
- Average rainfall days in September: 11.9 days
The month with the highest number of rainy days is June (19.3 days).
The month with the least rainy days is January (4.5 days).
Average snowfall in September
Chelsea, IA
- Average snowfall in September: 0"
The month with the highest snowfall is January (5.24").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Chelsea, IA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (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
Chelsea, 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 1min
The month with the most sunshine is July (Average sunshine: 9h and 54min).
The month with the least sunshine is January (Average sunshine: 4h and 0min).
Average sunshine days in September
Chelsea, IA
- Average sunshine days in September: 16.5 days
The month with the most sunshine days is October (19.2 days).
The month with the least sunshine days is June (8.4 days).
Average UV index in September
Chelsea, 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, October, November and December (UV index 2).
Average cloud cover in September
Chelsea, IA
- Average cloud cover in September: 30
The month with the most cloud cover is January (Cloud cover 57).
The month with the least cloud cover is September (Cloud cover 30).
Average visibility in September
Chelsea, 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).
Chelsea, Iowa, USA
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