United StatesThe weather in September in Washington
It's warm in September in Washington with an average temperature of 24°C. Temperatures this month range from a low of 19°C to a high of 28°C. At night, you can expect temperatures between 11°C and 20°C.
Looking for great weather? September is a good time to be in Washington. The temperatures are nice, and there’s not too much 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 Washington, California. 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 2022, Washington reached the highest temperature in September over the past 10 years. The lowest daytime temperature in this month was 6°C in 2019. The extreme nighttime temperatures ranged from a lowest recorded value of 1°C to a highest value of 28°C.
Precipitation and snowfall
In September, there is an average of 25 mm of precipitation, spread over 4 days. Of the total precipitation, about 0,2 cm falls as snow in September. The wind speed is around 3 Bft, mostly coming from the South.
Daily weather in September for Washington
Click on any day in September to get detailed info about the usual weather on that day in Washington. Check out the historical temperatures and precipitation over the past 10 years on this day.
September weather comparison
| Washington | New York | |
|---|---|---|
| Average temperature | 24°C | 27°C |
| Max. temperature | 28°C | 31°C |
| Min. temperature | 11°C | -5°C |
| Total precipitation | 25 mm | 57 mm |
| Rainy days | 4 days | 9 days |
| Total snowfall | 0,2 cm | 0 cm |
| Snowy days | 1 day | 0 days |
Start of September
The month of September starts in Washington with hot temps, averaging around 28°C during the day and nights around 19°C.
Mid September
By mid-September, daytime temps drop to around 23°C, with nights around 15°C. Not much precipitation expected during this period. It’s mostly dry and sunny.
End of September
By the end of September, the average daytime temperature in Washington is around 22°C, while nighttime temps are about 14°C. There’s hardly any chance of precipitation. The weather will be mostly dry with plenty of sun.
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UV index
The UV index is a maximum of 7 this month. That's a moderate to high value on the intensity scale of 1 to 11. Unprotected skin can burn within 15-25 minutes.
Check out the climate of Washington for all months and discover the best travel time
Temperature charts
These charts show the average temperatures in September in Washington, California. The temperatures are shown in degrees Celsius and are calculated based on data from the past 10 years.
Daily Temperature in September in Washington
Temperature in September in Washington over the years
Precipitation charts
These charts show the average amount of precipitation in September in Washington, California. 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 Washington
Total precipitation in September in Washington over the years
Daily Snowfall in September in Washington
Snowfall in September in Washington per year
Daily UV index in September in Washington
This chart shows the average daily UV index in September in Washington, 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 Washington
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Average weather in Washington by month
Click on a month below to see detailed weather info for Washington. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.