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
As August transitions into September, Saint Charles sees a gentle drop in the average high-temperature, transitioning from a moderately hot 85.1°F (29.5°C) to a still warm 78.6°F (25.9°C). Saint Charles's nights in September cool down to an average low-temperature of 61.9°F (16.6°C).Humidity
In September, the average relative humidity is 77%.Rainfall
In Saint Charles, in September, it is raining for 12.1 days, with typically 2.05" (52mm) of accumulated precipitation. Throughout the year, there are 151.4 rainfall days, and 29.33" (745mm) of precipitation is accumulated.Snowfall
In Saint Charles, snow does not fall in May through October.Daylight
In September, the average length of the day is 12h and 26min.On the first day of September, sunrise is at 6:37 am and sunset at 7:37 pm. On the last day of the month, sunrise is at 7:03 am and sunset at 6:51 pm EDT.
Sunshine
In Saint Charles, the average sunshine in September is 8.7h.UV index
In September, the average daily maximum UV index is 5. A UV Index of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV radiation for average individuals.Note: A maximum high daily UV index of 5 during September translates into the following directions:
Exercise prevention - Precautions against solar damage are endorsed. Stay safe from the Sun's strongest UV rays by limiting exposure during midday. Outfit yourself in sun-safe attire, like long sleeves, pants, a hat, and UV-blocking sunglasses.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the usual temperature for Saint Charles in September?
What is the average humidity in September in Saint Charles?
How much does it rain in September?
When it does not snow?
What is the average length of the day in September?
When is the sunrise / sunset in September?
How many hours of sunshine does Saint Charles have in September?
What is the UV index reading in September?
Average temperature in September
Saint Charles, MD
- Average high temperature in September: 78.6°F
The warmest month (with the highest average high temperature) is July (87.4°F).
The month with the lowest average high temperature is January (41.5°F).
- Average low temperature in September: 61.9°F
The month with the highest average low temperature is July (68.9°F).
The coldest month (with the lowest average low temperature) is January (28.4°F).
Average pressure in September
Saint Charles, MD
- Average pressure in September: 30.05"Hg
The month with the highest atmospheric pressure is November (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.95"Hg).
Average wind speed in September
Saint Charles, MD
- Average wind speed in September: 5.8mph
The windiest months (with the highest average wind speed) are March and April (7.8mph).
The calmest months (with the lowest average wind speed) are July and August (5.2mph).
Average humidity in September
Saint Charles, MD
- Average humidity in September: 77%
The month with the highest relative humidity is May (78%).
The months with the lowest relative humidity are January, March and April (73%).
Average rainfall in September
Saint Charles, MD
- Average rainfall in September: 2.05"
The wettest month (with the highest rainfall) is August (3.31").
The driest month (with the least rainfall) is January (1.85").
Average rainfall days in September
Saint Charles, MD
- Average rainfall days in September: 12.1 days
The month with the highest number of rainy days is May (16.8 days).
The month with the least rainy days is November (8.7 days).
Average snowfall in September
Saint Charles, MD
- Average snowfall in September: 0"
The month with the highest snowfall is January (2.32").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Saint Charles, MD
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (4.3 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Saint Charles, MD
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 30min).
- Average sunshine in September: 8h and 4min
The month with the most sunshine is July (Average sunshine: 10h and 30min).
The months with the least sunshine are February and December (Average sunshine: 5h and 0min).
Average sunshine days in September
Saint Charles, MD
- Average sunshine days in September: 15.7 days
The month with the most sunshine days is November (19.6 days).
The month with the least sunshine days is May (11.4 days).
Average UV index in September
Saint Charles, MD
- Average UV index in September: 5
The months with the highest UV index are May, June, July and August (UV index 6).
The months with the lowest UV index are January, February and December (UV index 2).
Average cloud cover in September
Saint Charles, MD
- Average cloud cover in September: 38
The month with the most cloud cover is March (Cloud cover 47).
The month with the least cloud cover is July (Cloud cover 32).
Average visibility in September
Saint Charles, MD
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is May (5mi).
Saint Charles, Maryland, USA
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