Temperatures in September
It's cool to moderate in September in Sequim with an average temperature of 18°C. Temperatures this month range from a low of 15°C to a high of 20°C. At night, you can expect temperatures between 10°C and 12°C.
Max and Min Temperatures per Day
This chart shows the daily maximum and minimum temperatures in degrees Celsius for Sequim in September. The red line indicates the max temperatures, and the blue line shows the minimums.
Start of September
The month of September starts in Sequim with mild temperatures, averaging around 19°C during the day and nights close to 12°C. There’s little chance of precipitation. The weather is mostly sunny and dry.
Mid-September
By mid-September, the average daytime temperature drops to around 18°C, with nights close to 12°C. Not much precipitation expected during this period. It’s mostly dry with sunshine.
End of September
By the end of September, the average daytime temperature in Sequim will be around 17°C, with nights close to 11°C. Barely any chance of precipitation. The weather will mostly be dry with lots of sunshine.
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Precipitation in September
In September, there is an average of 35 mm of precipitation, spread over 7 days. The wind speed is around 3 Bft, mostly coming from the West.
The average precipitation chance is 23% per day this month. Though that seems low, there are also a few days with a higher chance of precipitation.
Precipitation Chance
This chart shows the daily precipitation chance (in percentages) in September for Sequim. 0% means it never rained on that day in the past 10 years, and 100% means it rained every day. All values in between represent the average chance of precipitation on that day.
Sequim in September |
London | ||
|---|---|---|---|
 Average Temperature |
18°C | 20°C | |
 High Temp |
20°C | 22°C | |
| Low Temp |
15°C | 17°C | |
 Total Precipitation |
35 mm | 44 mm | |
| Rainy Days |
7 days | 8 days | |
August
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.
Is September a good time to visit Sequim?
Want nice weather? Then September is a great time to be in Sequim. You’ll have pleasant temperatures and not too much rain this month.
Temperature records for Sequim in September
With 27°C, Sequim hit the highest temperature in the last 10 years in September 2017. The lowest daytime temperature in this month was 12°C in 2019. The extreme night temperatures ranged from a low of 6°C to a high of 17°C.
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Daily Temperature in September in Sequim
This chart shows the average daily temperatures, both day and night, for each day in September in Sequim, measured in degrees Celsius. The red line represents the maximum temperatures, while the blue line shows the minimums. The days of the month are displayed at the bottom of the chart. The data, based on historical observations, gives an overview of the average daily temperatures during this month.
Daily Precipitation in September in Sequim
The chart below shows the average daily precipitation in September for Sequim, measured in millimetres over the past years. Precipitation is always measured as water, even if it’s snow or hail. The days of the month are shown at the bottom of the chart.
A low average precipitation means that the chance of rain on that day is usually small, while a higher average suggests that rain is more likely. But it’s still an average, so each day can be different. Based on historical weather data for September, you can expect around 7 days of rain in Sequim.
Daily UV Index in September in Sequim
This chart shows the average daily UV index in September in Sequim, 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.
Temperature in September in Sequim Over the Years
This chart shows the average temperature in September in Sequim, measured in degrees Celsius, over the past years.
Total Precipitation in September in Sequim Over the Years
This chart shows the average precipitation in September in Sequim, measured in millimetres over the past years. Precipitation is always measured as water, even if it’s snow or hail.
Daily climate in September for Sequim
Click on a specific day in September for detailed info on the typical weather on that day in Sequim. Check out the historical temperatures and precipitation over the past 10 years on this day.
Weather experiences in September in Sequim
Have you been to Sequim in September?
Share your weather experience in September in Sequim.
Average Weather in Sequim by Month
Click on a month below to see detailed weather info for Sequim. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.
