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United StatesThe weather in September in Annandale
It's warm in September in Annandale with an average temperature of 27°C. Temperatures this month range from a low of 22°C to a high of 32°C. At night, you can expect temperatures between 15°C and 21°C.
Looking for sun? September isn’t a good month to be in Annandale. The temperature is nice, but there’s too much chance of rain.
Average temperatures and precipitation
This chart shows the average daily maximum and minimum temperatures (in degrees Celsius) and precipitation (in millimeters) in September for Annandale, Virginia. A low precipitation value usually indicates little to no rainfall on that day in recent years, while a higher value suggests more frequent rainfall.
Temperature records
With 37°C in 2023, Annandale reached the highest temperature in September over the past 10 years. The lowest daytime temperature in this month was 16°C in 2022. The extreme nighttime temperatures ranged from a lowest recorded value of 5°C to a highest value of 26°C.
Rainfall amount
In September, there is an average of 158 mm of precipitation, spread over 17 days. The wind speed is around 3 Bft, mostly coming from the South.
Daily weather in September for Annandale
Click on any day in September to get detailed info about the usual weather on that day in Annandale. Check out the historical temperatures and precipitation over the past 10 years on this day.
September weather comparison
| Annandale | New York | |
|---|---|---|
| Average temperature | 27°C | 27°C |
| Max. temperature | 32°C | 31°C |
| Min. temperature | 15°C | -5°C |
| Total precipitation | 158 mm | 57 mm |
| Rainy days | 17 days | 9 days |
Start of September
The month of September starts in Annandale with hot temps, averaging around 30°C during the day and nights around 20°C.
Mid September
By mid-September, daytime temps drop to around 28°C, with nights around 18°C. There’s a chance of some showers during this time, but plenty of dry and sunny days too.
End of September
By the end of September, the average daytime temperature in Annandale is around 26°C, while nighttime temps are about 16°C. There’s a significant chance of many days with precipitation.
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UV index
The UV index is a maximum of 8 this month. That's a very high value on the intensity scale of 1 to 11. Unprotected skin can burn within 10-15 minutes.
Check out the climate of Annandale for all months and discover the best travel time
Temperature charts
These charts show the average temperatures in September in Annandale, Virginia. The temperatures are shown in degrees Celsius and are calculated based on data from the past 10 years.
Daily Temperature in September in Annandale
Temperature in September in Annandale over the years
Precipitation charts
These charts show the average amount of precipitation in September in Annandale, Virginia. Precipitation is always measured as water, even when it falls as snow or hail The amount of precipitation is displayed in millimeters, while snowfall is shown in centimeters.
Daily Precipitation in September in Annandale
Total precipitation in September in Annandale over the years
Daily UV index in September in Annandale
This chart shows the average daily UV index in September in Annandale, with the UV index ranging from 0 to a maximum of 11. The bottom of the chart shows the days of the month. Based on historical data, this chart provides an idea of the daily UV radiation levels you can expect.
Weather experiences in September in Annandale
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Average weather in Annandale by month
Click on a month below to see detailed weather info for Annandale. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.