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
In Chevy Chase, Maryland, the average high-temperature in September marginally drops from 85.8°F (29.9°C) in August to a still moderately hot 78.4°F (25.8°C). In Chevy Chase, the average low-temperature is 61.5°F (16.4°C).Humidity
The average relative humidity in September is 73%.Rainfall
In September, in Chevy Chase, the rain falls for 12.5 days. Throughout September, 2.05" (52mm) of precipitation is accumulated. Throughout the year, in Chevy Chase, there are 150.3 rainfall days, and 28.66" (728mm) of precipitation is accumulated.Snowfall
In Chevy Chase, Maryland, snow does not fall in May through October.Daylight
In Chevy Chase, the average length of the day in September is 12h and 26min.On the first day of the month, sunrise is at 6:37 am and sunset at 7:39 pm. On the last day of September, sunrise is at 7:03 am and sunset at 6:53 pm EDT.
Sunshine
The average sunshine in September is 8.8h.UV index
In Chevy Chase, the average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a moderate threat to health from unprotected exposure to Sun's UV rays for ordinary individuals.Note: In September, the average maximum UV index of 5 translate into the following recommendations:
Take precautions - Protection against sun damage is advised. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.
FAQ
What is the temperature in September in Chevy Chase?
What is the average humidity in September in Chevy Chase?
How much does it rain in Chevy Chase in September?
When it does not snow in Chevy Chase?
How many hours of daylight does Chevy Chase have in September?
When is the sunrise / sunset in September in Chevy Chase?
How long on average sun shines in September in Chevy Chase?
How high is the UV index in September in Chevy Chase?
Average temperature in September
Chevy Chase, MD
- Average high temperature in September: 78.4°F
The warmest month (with the highest average high temperature) is July (87.8°F).
The month with the lowest average high temperature is January (39.9°F).
- Average low temperature in September: 61.5°F
The month with the highest average low temperature is July (69.4°F).
The coldest month (with the lowest average low temperature) is January (27°F).
Average pressure in September
Chevy Chase, 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
Chevy Chase, MD
- Average wind speed in September: 5.7mph
The windiest month (with the highest average wind speed) is March (8mph).
The calmest month (with the lowest average wind speed) is August (5.1mph).
Average humidity in September
Chevy Chase, MD
- Average humidity in September: 73%
The month with the highest relative humidity is December (76%).
The month with the lowest relative humidity is July (69%).
Average rainfall in September
Chevy Chase, MD
- Average rainfall in September: 2.05"
The wettest month (with the highest rainfall) is August (3.82").
The driest month (with the least rainfall) is January (1.69").
Average rainfall days in September
Chevy Chase, MD
- Average rainfall days in September: 12.5 days
The month with the highest number of rainy days is May (17.1 days).
The month with the least rainy days is November (8.5 days).
Average snowfall in September
Chevy Chase, MD
- Average snowfall in September: 0"
The month with the highest snowfall is January (2.6").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Chevy Chase, MD
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (4.4 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
Chevy Chase, MD
- Average daylight in September: 12h and 26min
The month with the longest days is June (Average daylight: 14h and 52min).
The month with the shortest days is December (Average daylight: 9h and 29min).
- Average sunshine in September: 8h and 48min
The month with the most sunshine is July (Average sunshine: 10h and 42min).
The months with the least sunshine are January, February and December (Average sunshine: 5h and 0min).
Average sunshine days in September
Chevy Chase, MD
- Average sunshine days in September: 15.8 days
The month with the most sunshine days is November (20.4 days).
The months with the least sunshine days are May and July (12.3 days).
Average UV index in September
Chevy 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, November and December (UV index 2).
Average cloud cover in September
Chevy Chase, MD
- Average cloud cover in September: 37
The month with the most cloud cover is March (Cloud cover 47).
The month with the least cloud cover is July (Cloud cover 31).
Average visibility in September
Chevy Chase, 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).
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