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Seattle Weather in September, USA

Seattle Averages September

SEATTLE AVERAGES FOR SEPTEMBER

  • What is Average Temperature?
    The average high temperature and the average low temperature for that month, on a daily basis, divided by 2 equals the average temperature for that month

    Temperature

    16°C
    61°F
  • What is Average High Low Temperature?
    The sum of high temperatures/low temperatures divided by the number of days in that month, recorded daily

    High Temperature

    20°C
    68°F
  • What is Average High Low Temperature?
    The sum of high temperatures/low temperatures divided by the number of days in that month, recorded daily

    Low Temperature

    11°C
    52°F
  • What is Average Sea Temperature?
    Average daily sea temperatures and divided by the number of days in the month. Sea Temperatures are taken from buoys, ships and even satellites can calculate sea temperature based on energy that is radiated from the sea's surface

    Sea Temperature

    13°C
    55°F
  • What are Average Daily Sunshine Hours?
    Total sunshine hours for the month, divided by the number of days in the month. Sunshine hours are taken with a sunshine recorder, either a Campbell-Stokes recorder or an Eppley Pyreheliometer

    Sunshine Hours

    7 hours
  • What is Average Rainfall?
    The amount of mm in rain for that month divided by the number of days, and the number of days that it rains during that month on average, over a given period of years

    Rainfall Days

    9 days
  • What is Average Rainfall?
    The amount of mm in rain for that month divided by the number of days, and the number of days that it rains during that month on average, over a given period of years

    Rainfall

    51 mm

Slide and Tap Other Months

Seattle Daily Averages September

September 2024 Daily Averages

Sun
1 Avg 17º 63º
Mon
2 Avg 18º 64º
Tue
3 Avg 19º 66º
Wed
4 Avg 18º 64º
Thu
5 Avg 18º 64º
Fri
6 Avg 17º 63º
Sat
7 Avg 18º 64º
8 Avg 18º 64º
9 Avg 18º 64º
10 Avg 17º 63º
11 Avg 18º 64º
12 Avg 18º 64º
13 Avg 18º 64º
14 Avg 18º 64º
15 Avg 17º 63º
16 Avg 16º 61º
17 Avg 16º 61º
18 Avg 17º 63º
19 Avg 17º 63º
20 Avg 16º 61º
21 Avg 16º 61º
22 Avg 16º 61º
23 Avg 15º 59º
24 Avg 15º 59º
25 Avg 15º 59º
26 Avg 15º 59º
27 Avg 16º 61º
28 Avg 16º 61º
29 Avg 15º 59º
30 Avg 14º 57º
Forecast
Avg Historical Daily Average

September Weather Averages

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September in Seattle is the beginning of autumn.

The lovely summer weather is ending in September, and the weather begins to take a turn for the worse from this month on, with less sun seen and cooler temperatures.

The average daily temperature expected in Seattle in this month is 20°C (68°F), dropping to an average temperature of 11°C (52°F).

Seattle sees up to 7 hours of sunshine per day throughout the month.

The average expectation for rain fall for this month is 51 mm over 9 days.

Seattle in this month expects an average of 0 days of snow or foggy weather.

The average temperature of the sea during this month is 13°C (55°F).

There's still plenty to do in Seattle through September though.

Football season is kicking off again, in September, with the NFL and college football seasons starting. Book your tickets to get a glimpse of your favourite teams playing, sports fans.

It may not be summer in the city anymore, but the days in Seattle are still warm in September, so sight seeing on foot is still a viable option, without fearing getting soaked.

The Native American flute is celebrated in Seattle with Flute Quest in September. The three day event holds open mic events, workshops and live programs, with artisans, musicians and vendors coming together for the festivities.

Oktoberfest is celebrated in the Fremont area, with Fremont Oktoberfest. The 70 different types of beers on offer, at various beer gardens, are just some of the attractions of this event.

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