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
Chelsea's progression into September involves a minor drop in the average high-temperature, slightly receding from a warm 77.5°F (25.3°C) in August to a pleasant 72°F (22.2°C). The nights of September in Chelsea anticipate an average low-temperature of 53.4°F (11.9°C).Humidity
The average relative humidity in September is 80%.Rainfall
In Chelsea, in September, during 13.5 rainfall days, 1.81" (46mm) of precipitation is typically accumulated. In Chelsea, Michigan, during the entire year, the rain falls for 154.5 days and collects up to 26.85" (682mm) of precipitation.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 the month, sunrise is at 7:02 am and sunset at 8:09 pm. On the last day of September, sunrise is at 7:32 am and sunset at 7:18 pm EDT.
Sunshine
In Chelsea, the average sunshine in September is 7.9h.UV index
The average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a moderate threat to health from unsafe exposure to UV radiation for average individuals.Note: In September, the average maximum UV index of 4 translates into the following recommendations:
Be mindful. Individuals with a lighter skin tone may suffer burns in less than 30 minutes. Avoiding direct sunlight during midday hours helps reduce the risk from intense UV radiation. A wide-brimmed hat provides unparalleled sun protection for sensitive areas like the eyes, ears, and neck.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the average September temperature in Chelsea?
What is the average humidity in September in Chelsea?
How many days does it rain in September in Chelsea?
When it does not snow in Chelsea?
Does it snow in Chelsea in September?
How many hours of daylight does Chelsea have in September?
When are sunrise and sunset in September in Chelsea?
How long on average sun shines in September in Chelsea?
How high is the UV index in September in Chelsea?
Average temperature in September
Chelsea, MI
- Average high temperature in September: 72°F
The warmest month (with the highest average high temperature) is July (79.3°F).
The month with the lowest average high temperature is January (27.9°F).
- Average low temperature in September: 53.4°F
The month with the highest average low temperature is July (61.3°F).
The coldest month (with the lowest average low temperature) is January (17.1°F).
Average pressure in September
Chelsea, MI
- Average pressure in September: 30.04"Hg
The months with the highest atmospheric pressure are March and November (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in September
Chelsea, MI
- Average wind speed in September: 7.1mph
The windiest month (with the highest average wind speed) is January (10.2mph).
The calmest month (with the lowest average wind speed) is July (6.4mph).
Average humidity in September
Chelsea, MI
- Average humidity in September: 80%
The months with the highest relative humidity are January and February (86%).
The month with the lowest relative humidity is April (77%).
Average rainfall in September
Chelsea, MI
- Average rainfall in September: 1.81"
The wettest month (with the highest rainfall) is May (3.43").
The driest month (with the least rainfall) is December (1.46").
Average rainfall days in September
Chelsea, MI
- Average rainfall days in September: 13.5 days
The month with the highest number of rainy days is May (17.5 days).
The month with the least rainy days is February (6.8 days).
Average snowfall in September
Chelsea, MI
- Average snowfall in September: 0"
The month with the highest snowfall is January (5.12").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Chelsea, MI
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (15.7 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, MI
- 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 6min).
- Average sunshine in September: 7h and 5min
The month with the most sunshine is July (Average sunshine: 10h and 12min).
The month with the least sunshine is January (Average sunshine: 2h and 54min).
Average sunshine days in September
Chelsea, MI
- Average sunshine days in September: 14.5 days
The month with the most sunshine days is March (14.8 days).
The month with the least sunshine days is February (9.7 days).
Average UV index in September
Chelsea, MI
- Average UV index in September: 4
The months with the highest UV index are May, June, July and August (UV index 5).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in September
Chelsea, MI
- Average cloud cover in September: 37
The month with the most cloud cover is January (Cloud cover 70).
The month with the least cloud cover is July (Cloud cover 32).
Average visibility in September
Chelsea, MI
- Average visibility in September: 5mi
The months with the highest visibility are March, April, May, June, July, October and November (6mi).
The months with the lowest visibility are January, February, August, September and December (5mi).
Chelsea, Michigan, USA
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