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 onset of September is marked by a minor decrease in temperature, transitioning from a moderately hot 77.5°F (25.3°C) in August to a pleasant 70.9°F (21.6°C). Throughout the month of September, Saint Charles reports a steady low-temperature average of 52.5°F (11.4°C).Humidity
In Saint Charles, Michigan, the average relative humidity in September is 79%.Rainfall
In Saint Charles, in September, it is raining for 10 days, with typically 1.06" (27mm) of accumulated precipitation. In Saint Charles, during the entire year, the rain falls for 126.4 days and collects up to 15.79" (401mm) of precipitation.Snowfall
May through September are months without snowfall in Saint Charles.Daylight
In Saint Charles, the average length of the day in September is 12h and 29min.On the first day of the month, sunrise is at 7:01 am and sunset at 8:11 pm. On the last day of September, in Saint Charles, sunrise is at 7:33 am and sunset at 7:18 pm EDT.
Sunshine
The average sunshine in September is 8h.UV index
In Saint Charles, the average daily maximum UV index in September is 3. A UV Index reading of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV radiation for average individuals.Note: The maximum UV index, 3 during September, leads to the following recommendations:
Put precautions into practice - Guidance to elude sunburn is provided. The Sun's most harmful UV rays are emitted around midday; avoid staying outdoors for long during this time. Boost your sun resistance with garments that are densely woven yet spacious.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in Saint Charles in September?
What is the average humidity in September in Saint Charles?
How much does it rain in Saint Charles in September?
When it does not snow in Saint Charles?
Does it snow in Saint Charles in September?
What is the average length of the day in September in Saint Charles?
When is the sunrise / sunset in September in Saint Charles?
How long on average sun shines in September in Saint Charles?
What is the UV index intensity in September in Saint Charles?
Average temperature in September
Saint Charles, MI
- Average high temperature in September: 70.9°F
The warmest month (with the highest average high temperature) is July (78.8°F).
The month with the lowest average high temperature is January (27°F).
- Average low temperature in September: 52.5°F
The month with the highest average low temperature is July (60.6°F).
The coldest month (with the lowest average low temperature) is January (16.3°F).
Average pressure in September
Saint Charles, MI
- Average pressure in September: 30.03"Hg
The month with the highest atmospheric pressure is March (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in September
Saint Charles, MI
- Average wind speed in September: 7.3mph
The windiest months (with the highest average wind speed) are February and April (9.8mph).
The calmest month (with the lowest average wind speed) is July (6.5mph).
Average humidity in September
Saint Charles, MI
- Average humidity in September: 79%
The month with the highest relative humidity is January (88%).
The month with the lowest relative humidity is April (75%).
Average rainfall in September
Saint Charles, MI
- Average rainfall in September: 1.06"
The wettest month (with the highest rainfall) is May (2.13").
The driest month (with the least rainfall) is February (0.75").
Average rainfall days in September
Saint Charles, MI
- Average rainfall days in September: 10 days
The month with the highest number of rainy days is May (16.3 days).
The month with the least rainy days is February (4.1 days).
Average snowfall in September
Saint Charles, MI
- Average snowfall in September: 0"
The month with the highest snowfall is January (3.19").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in September
Saint Charles, MI
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (11.6 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Saint Charles, MI
- 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 0min).
- Average sunshine in September: 8h and 0min
The month with the most sunshine is July (Average sunshine: 10h and 24min).
The month with the least sunshine is January (Average sunshine: 2h and 48min).
Average sunshine days in September
Saint Charles, MI
- Average sunshine days in September: 17.3 days
The month with the most sunshine days is November (17.9 days).
The month with the least sunshine days is May (11.5 days).
Average UV index in September
Saint Charles, MI
- Average UV index in September: 3
The months with the highest UV index are May, June, July and August (UV index 5).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in September
Saint Charles, MI
- Average cloud cover in September: 35
The month with the most cloud cover is January (Cloud cover 70).
The month with the least cloud cover is July (Cloud cover 31).
Average visibility in September
Saint Charles, MI
- Average visibility in September: 6mi
The months with the highest visibility are March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January and February (5mi).
Saint Charles, Michigan, USA
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