Weathermondo.com
United StatesThe weather in September in West Lake Sammamish
It's pleasantly warm in September in West Lake Sammamish with an average temperature of 22°C. Temperatures this month range from a low of 19°C to a high of 25°C. At night, you can expect temperatures between 12°C and 16°C.
Looking for great weather? September is a good time to be in West Lake Sammamish. 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 West Lake Sammamish, 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 33°C in 2020, West Lake Sammamish reached the highest temperature in September over the past 10 years. The lowest daytime temperature in this month was 13°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 52 mm of precipitation, spread over 8 days. The wind speed is around 3 Bft, mostly coming from the Southwest.
Daily weather in September for West Lake Sammamish
Click on any day in September to get detailed info about the usual weather on that day in West Lake Sammamish. Check out the historical temperatures and precipitation over the past 10 years on this day.
September weather comparison
| West Lake Sammamish | New York | |
|---|---|---|
| Average temperature | 22°C | 27°C |
| Max. temperature | 25°C | 31°C |
| Min. temperature | 12°C | -5°C |
| Total precipitation | 52 mm | 57 mm |
| Rainy days | 8 days | 9 days |
Start of September
The month of September starts in West Lake Sammamish with warm temps, averaging around 25°C during the day and nights around 15°C.
Mid September
By mid-September, daytime temps drop to around 22°C, with nights around 14°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 West Lake Sammamish is around 21°C, while nighttime temps are about 13°C. A shower might pop up, but overall, the weather will be dry and sunny.
UV index
The UV index is a maximum of 6 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 West Lake Sammamish for all months and discover the best travel time
Temperature charts
These charts show the average temperatures in September in West Lake Sammamish, Washington. The temperatures are shown in degrees Celsius and are calculated based on data from the past 10 years.
Daily Temperature in September in West Lake Sammamish
Temperature in September in West Lake Sammamish over the years
Precipitation charts
These charts show the average amount of precipitation in September in West Lake Sammamish, 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 West Lake Sammamish
Total precipitation in September in West Lake Sammamish over the years
Daily UV index in September in West Lake Sammamish
This chart shows the average daily UV index in September in West Lake Sammamish, 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 West Lake Sammamish
Have you been to West Lake Sammamish in September?
Share your weather experience in September in West Lake Sammamish.
Average weather in West Lake Sammamish by month
Click on a month below to see detailed weather info for West Lake Sammamish. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.