September weather forecastCatharpin, VA
September
Weather in September
The first month of the autumn, September, is also a moderately hot month in Catharpin, Virginia, with an average temperature fluctuating between 59.9°F (15.5°C) and 78.4°F (25.8°C).Temperature
The move into September indicates a slight reduction in the average high-temperature, down from August's warm 85.6°F (29.8°C) to a still moderately hot 78.4°F (25.8°C). An average low-temperature of 59.9°F (15.5°C) is anticipated throughout the nights during September.Humidity
In September, the average relative humidity in Catharpin is 75%.Rainfall
September is the month with the least rainfall. Rain falls for 12.5 days and accumulates 2.05" (52mm) of precipitation.Snowfall
In Catharpin, snow does not fall in May through October.Daylight
In Catharpin, the average length of the day in September is 12h and 26min.On the first day of the month, sunrise is at 6:39 am and sunset at 7:40 pm. On the last day of September, sunrise is at 7:05 am and sunset at 6:54 pm EDT.
Sunshine
The average sunshine in September is 8.6h.UV index
In September, the average daily maximum UV index in Catharpin is 4. A UV Index value of 3 to 5 symbolizes a moderate health risk from unprotected exposure to Sun's UV rays for the average person.Note: The daily high UV index of 4 during September translates into the following recommendations:
Heed the precautions - Protecting the skin and eyes from damage is compulsory. Solar radiation is at its peak intensity during midday, so it's advisable to stay indoors or in the shade. A hat with a broad brim is indispensable, filtering out up to half of UV rays.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Catharpin, VA
- Average high temperature in September: 78.4°F
The warmest month (with the highest average high temperature) is July (88.2°F).
The month with the lowest average high temperature is January (39.7°F).
- Average low temperature in September: 59.9°F
The month with the highest average low temperature is July (67.3°F).
The coldest month (with the lowest average low temperature) is January (25.7°F).
Average pressure in September
Catharpin, VA
- Average pressure in September: 30.06"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
Catharpin, VA
- Average wind speed in September: 5.3mph
The windiest months (with the highest average wind speed) are March and April (7.3mph).
The calmest month (with the lowest average wind speed) is August (4.7mph).
Average humidity in September
Catharpin, VA
- Average humidity in September: 75%
The months with the highest relative humidity are October and December (77%).
The month with the lowest relative humidity is July (71%).
Average rainfall in September
Catharpin, VA
- Average rainfall in September: 2.05"
The wettest month (with the highest rainfall) is August (3.74").
The driest month (with the least rainfall) is September (2.05").
Average rainfall days in September
Catharpin, VA
- Average rainfall days in September: 12.5 days
The month with the highest number of rainy days is May (17.5 days).
The month with the least rainy days is November (9.4 days).
Average snowfall in September
Catharpin, VA
- Average snowfall in September: 0"
The month with the highest snowfall is January (3.58").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Catharpin, VA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (5.3 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
Catharpin, VA
- 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: 8h and 36min
The month with the most sunshine is July (Average sunshine: 10h and 42min).
The month with the least sunshine is December (Average sunshine: 4h and 54min).
Average sunshine days in September
Catharpin, VA
- Average sunshine days in September: 16.8 days
The month with the most sunshine days is November (19.6 days).
The month with the least sunshine days is July (12.1 days).
Average UV index in September
Catharpin, VA
- Average UV index in September: 4
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, November and December (UV index 2).
Average cloud cover in September
Catharpin, VA
- 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 31).
Average visibility in September
Catharpin, VA
- Average visibility in September: 6mi
The months with the highest visibility are February, March, April, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January and May (5mi).
