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United StatesThe weather in September in Mill Creek
It's pleasantly warm in September in Mill Creek with an average temperature of 21°C. Temperatures this month range from a low of 18°C to a high of 24°C. At night, you can expect temperatures between 11°C and 15°C.
Looking for sun? September isn’t a good month to be in Mill Creek. 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 Mill Creek, 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, Mill Creek reached the highest temperature in September over the past 10 years. The lowest daytime temperature in this month was 11°C in 2019. The extreme nighttime temperatures ranged from a lowest recorded value of 5°C to a highest value of 20°C.
Rainfall amount
In September, there is an average of 100 mm of precipitation, spread over 13 days. The wind speed is around 3 Bft, mostly coming from the Southwest.
Daily weather in September for Mill Creek
Click on any day in September to get detailed info about the usual weather on that day in Mill Creek. Check out the historical temperatures and precipitation over the past 10 years on this day.
September weather comparison
| Mill Creek | New York | |
|---|---|---|
| Average temperature | 21°C | 27°C |
| Max. temperature | 24°C | 31°C |
| Min. temperature | 11°C | -5°C |
| Total precipitation | 100 mm | 57 mm |
| Rainy days | 13 days | 9 days |
Start of September
The month of September starts in Mill Creek with warm temps, averaging around 23°C during the day and nights around 14°C.
Mid September
By mid-September, daytime temps drop to around 20°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 Mill Creek is around 20°C, while nighttime temps are about 12°C. Expect regular precipitation, but if you’re lucky, you’ll also get some dry and sunny days.
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UV index
The UV index is a maximum of 2 this month. That's a low value on the intensity scale of 1 to 11. The risk of sunburn is minimal at this time.
Check out the climate of Mill Creek for all months and discover the best travel time
Temperature charts
These charts show the average temperatures in September in Mill Creek, Washington. The temperatures are shown in degrees Celsius and are calculated based on data from the past 10 years.
Daily Temperature in September in Mill Creek
Temperature in September in Mill Creek over the years
Precipitation charts
These charts show the average amount of precipitation in September in Mill Creek, 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 Mill Creek
Total precipitation in September in Mill Creek over the years
Daily UV index in September in Mill Creek
This chart shows the average daily UV index in September in Mill Creek, 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 Mill Creek
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Average weather in Mill Creek by month
Click on a month below to see detailed weather info for Mill Creek. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.