Weathermondo.com
United StatesThe weather in September in Seattle Heights
It's pleasantly warm in September in Seattle Heights with an average temperature of 21°C. Temperatures this month range from a low of 18°C to a high of 23°C. At night, you can expect temperatures between 11°C and 15°C.
Looking for great weather? September is a good time to be in Seattle Heights. 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 Seattle Heights, Washington. 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 31°C in 2017, Seattle Heights reached the highest temperature in September over the past 10 years. The lowest daytime temperature in this month was 12°C in 2019. The extreme nighttime temperatures ranged from a lowest recorded value of 5°C to a highest value of 21°C.
Rainfall amount
In September, there is an average of 94 mm of precipitation, spread over 12 days. The wind speed is around 3 Bft, mostly coming from the Southwest.
Daily weather in September for Seattle Heights
Click on any day in September to get detailed info about the usual weather on that day in Seattle Heights. Check out the historical temperatures and precipitation over the past 10 years on this day.
September weather comparison
| Seattle Heights | New York | |
|---|---|---|
| Average temperature | 21°C | 27°C |
| Max. temperature | 23°C | 31°C |
| Min. temperature | 11°C | -5°C |
| Total precipitation | 94 mm | 57 mm |
| Rainy days | 12 days | 9 days |
Start of September
The month of September starts in Seattle Heights with warm temps, averaging around 22°C during the day and nights around 14°C.
Mid September
By mid-September, daytime temps drop to around 21°C, with nights around 13°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 Seattle Heights is around 20°C, while nighttime temps are about 13°C. Expect regular precipitation, but if you’re lucky, you’ll also get some dry and sunny days.
UV index
The UV index is a maximum of 5 this month. That's a moderate value on the intensity scale of 1 to 11. Unprotected skin can burn in about 30 minutes.
Check out the climate of Seattle Heights for all months and discover the best travel time
Temperature charts
These charts show the average temperatures in September in Seattle Heights, Washington. The temperatures are shown in degrees Celsius and are calculated based on data from the past 10 years.
Daily Temperature in September in Seattle Heights
Temperature in September in Seattle Heights over the years
Precipitation charts
These charts show the average amount of precipitation in September in Seattle Heights, Washington. 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 Seattle Heights
Total precipitation in September in Seattle Heights over the years
Daily UV index in September in Seattle Heights
This chart shows the average daily UV index in September in Seattle Heights, 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 Seattle Heights
Have you been to Seattle Heights in September?
Share your weather experience in September in Seattle Heights.
Average weather in Seattle Heights by month
Click on a month below to see detailed weather info for Seattle Heights. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.