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 arrival of September corresponds with a light shift in temperature, down from 82.9°F (28.3°C) in August to a still warm 77°F (25°C). Callao encounters a steady low-temperature average of 66.4°F (19.1°C) throughout the month of September.Humidity
In September, the average relative humidity in Callao, Virginia, is 76%.Rainfall
In September, the rain falls for 12.5 days. Throughout September, 1.61" (41mm) of precipitation is accumulated. In Callao, during the entire year, the rain falls for 147.5 days and collects up to 20.16" (512mm) of precipitation.Snowfall
April through October are months without snowfall in Callao.Daylight
The average length of the day in September is 12h and 25min.On the first day of September in Callao, sunrise is at 6:36 am and sunset at 7:35 pm. On the last day of the month, sunrise is at 7:01 am and sunset at 6:50 pm EDT.
Sunshine
In Callao, the average sunshine in September is 9.2h.UV index
In Callao, Virginia, the average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents a moderate health risk from exposure to the Sun's UV rays for the ordinary person.Note: In September, the maximum UV index of 5 suggests this advice:
Stay alert. Light-skinned people could suffer burns in less than 30 minutes. The best time to avoid the Sun's harmful UV radiation is during midday when it's most potent. Wearing a wide-brim hat can block approximately 50% of UV radiation, protecting the eyes.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in Callao in September?
What is the average humidity in September in Callao?
How many days does it rain in September in Callao?
When it does not snow in Callao?
How many hours of daylight does Callao have in September?
When is the sunrise / sunset in September in Callao?
How many hours of sunshine does Callao have in September?
What is the UV index intensity in September in Callao?
Average temperature in September
Callao, VA
- Average high temperature in September: 77°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 (41.5°F).
- Average low temperature in September: 66.4°F
The month with the highest average low temperature is July (72.9°F).
The coldest month (with the lowest average low temperature) is January (31.6°F).
Average pressure in September
Callao, VA
- Average pressure in September: 30.04"Hg
The month with the highest atmospheric pressure is November (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.95"Hg).
Average wind speed in September
Callao, VA
- Average wind speed in September: 8.4mph
The windiest month (with the highest average wind speed) is March (10.3mph).
The calmest month (with the lowest average wind speed) is July (7.2mph).
Average humidity in September
Callao, VA
- Average humidity in September: 76%
The month with the highest relative humidity is May (78%).
The months with the lowest relative humidity are January and November (73%).
Average rainfall in September
Callao, VA
- Average rainfall in September: 1.61"
The wettest month (with the highest rainfall) is July (2.95").
The driest month (with the least rainfall) is January (0.98").
Average rainfall days in September
Callao, VA
- Average rainfall days in September: 12.5 days
The month with the highest number of rainy days is July (17.3 days).
The month with the least rainy days is November (7.4 days).
Average snowfall in September
Callao, VA
- Average snowfall in September: 0"
The month with the highest snowfall is January (0.51").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in September
Callao, VA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (2.3 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
Callao, VA
- 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 36min).
- Average sunshine in September: 9h and 1min
The month with the most sunshine is July (Average sunshine: 10h and 48min).
The month with the least sunshine is February (Average sunshine: 5h and 12min).
Average sunshine days in September
Callao, VA
- Average sunshine days in September: 15.4 days
The month with the most sunshine days is November (21 days).
The month with the least sunshine days is August (11.3 days).
Average UV index in September
Callao, VA
- 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 and December (UV index 2).
Average cloud cover in September
Callao, VA
- 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 28).
Average visibility in September
Callao, VA
- 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).
Callao, Virginia, USA
Weather forecast for your location
2. Allow the app to use your location