September weather forecastCalvert Chase, MD
September
Weather in September
The first month of the autumn, September, is also a moderately hot month in Calvert Chase, Maryland, with an average temperature varying between 76.8°F (24.9°C) and 64.9°F (18.3°C).Temperature
September's arrival comes with a mild decrease in the average high-temperature, moving subtly from a warm 82.9°F (28.3°C) in August to a still moderately hot 76.8°F (24.9°C). During the month of September, the temperature generally drops to a low average of 64.9°F (18.3°C).Humidity
In September, the average relative humidity is 75%.Rainfall
In Calvert Chase, during September, the rain falls for 10.9 days and regularly aggregates up to 0.83" (21mm) of precipitation. Throughout the year, there are 127.2 rainfall days, and 11.85" (301mm) of precipitation is accumulated.Snowfall
April through October are months without snowfall.Daylight
In September, the average length of the day is 12h and 26min.On the first day of the month, sunrise is at 6:36 am and sunset at 7:36 pm. On the last day of September, sunrise is at 7:02 am and sunset at 6:50 pm EDT.
Sunshine
The average sunshine in September is 9.2h.UV index
In September, the average daily maximum UV index is 5. A UV Index of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV rays for the average person.Note: The UV index of 5 during September leads to these advisories:
Exercise prevention - Protecting skin and eyes from harm is required. Direct exposure to the Sun's intense radiation around midday should be avoided for health reasons. For optimum UV protection, wear sun-resistant attire complemented with a hat and quality shades.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Calvert Chase, MD
- Average high temperature in September: 76.8°F
The warmest month (with the highest average high temperature) is July (84.7°F).
The month with the lowest average high temperature is January (40.5°F).
- Average low temperature in September: 64.9°F
The month with the highest average low temperature is July (71.2°F).
The coldest month (with the lowest average low temperature) is January (30°F).
Average pressure in September
Calvert Chase, MD
- Average pressure in September: 30.05"Hg
The month with the highest atmospheric pressure is November (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).
Average wind speed in September
Calvert Chase, MD
- Average wind speed in September: 7.5mph
The windiest month (with the highest average wind speed) is March (9.8mph).
The calmest month (with the lowest average wind speed) is July (6.4mph).
Average humidity in September
Calvert Chase, MD
- Average humidity in September: 75%
The month with the highest relative humidity is May (78%).
The months with the lowest relative humidity are January and November (72%).
Average rainfall in September
Calvert Chase, MD
- Average rainfall in September: 0.83"
The wettest month (with the highest rainfall) is August (1.93").
The driest month (with the least rainfall) is January (0.51").
Average rainfall days in September
Calvert Chase, MD
- Average rainfall days in September: 10.9 days
The month with the highest number of rainy days is August (15.6 days).
The month with the least rainy days is November (5.9 days).
Average snowfall in September
Calvert Chase, MD
- Average snowfall in September: 0"
The month with the highest snowfall is January (0.55").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in September
Calvert Chase, MD
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (2.6 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Calvert Chase, MD
- Average daylight in September: 12h and 24min
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: 9h and 12min
The month with the most sunshine is July (Average sunshine: 10h and 54min).
The months with the least sunshine are February and December (Average sunshine: 5h and 12min).
Average sunshine days in September
Calvert Chase, MD
- Average sunshine days in September: 16.2 days
The month with the most sunshine days is November (22.6 days).
The month with the least sunshine days is August (12.5 days).
Average UV index in September
Calvert Chase, 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
Calvert Chase, MD
- Average cloud cover in September: 33
The month with the most cloud cover is March (Cloud cover 45).
The month with the least cloud cover is July (Cloud cover 27).
Average visibility in September
Calvert Chase, MD
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
