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Weather in Kirkland for September 2026

Your guide to Kirkland weather in September - trends and predictions

    Temperatures

  • Until now, September 2026 in Kirkland is slightly cooler than the historical average by 0.7 °C.

  • The forecast for the next days in Kirkland predicts temperatures to be around 17 °C, close to the historical average.

  • In general, the average temperature in Kirkland at the beginning of September is 24.6 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 17.9 °C by the end of September.

    • Rain 🌧️

  • The climate of Kirkland in September is notably wet, with an average of 14 rainy days, and a total of 142.3 mm of precipitation.

    • More

  • New! Chat with our AI weatherman - it’s amazing and free.

Average dry days
16
Dry days
Average rainy days
14
Rainy days
Average snowy days
0
Snow days
Average temperatures
22°/12°
Temperatures
Average wind speed
14 km/h
Avg max wind
Average humidity
74 %
Avg humidity

Kirkland Weather September

Move between months or click on a day
August
October
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Mist
25°
2
Mist
24°
3
Fog
25°
4
Cloudy
26°
5
Mist
25°
6
Cloudy
24°
7
Light rain shower
23°
8
Light rain shower
21°
9
Cloudy
21°
10
Light rain shower
22°
11
Overcast
21°
12
Mist
23°
13
Moderate rain
21°
14
Overcast
20°
15
Mist
23°
16
Overcast
24°
17
Partly cloudy
25°
18
Sunny
18°
19
Sunny
14°
20
Overcast
18°
21
Overcast
15°
22
Overcast
15°
23
Overcast
17°
24
Overcast
17°
25
Light rain shower
12°
26
Overcast
9°
27
Overcast
16°
28
Overcast
21°
29
Overcast
24°
30
Overcast
26°

Temperatures trend during September in Kirkland

See the weather trend as well as the moving average line

September weather in Kirkland day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
1 Sept. Mist
Mist
 25° /11° 1.8 mm 5
2 Sept. Mist
Mist
 24° /13° 76.5 mm 5
3 Sept. Fog
Fog
 25° /14° 40.5 mm 6
4 Sept. Cloudy
Cloudy
 26° /14° 8.8 mm 7
5 Sept. Mist
Mist
 25° /14° 31.9 mm 6
6 Sept. Cloudy
Cloudy
 24° /15° 5.7 mm 6
7 Sept. Light rain shower
Light rain shower
 23° /12° 5.9 mm 5
8 Sept. Light rain shower
Light rain shower
 21° /12° 11.4 mm 4
9 Sept. Cloudy
Cloudy
 21° /9° 5.3 mm 4
10 Sept. Light rain shower
Light rain shower
 22° /11° 1.8 mm 6
11 Sept. Overcast
Overcast
 21° /11° 0.8 mm 6
12 Sept. Mist
Mist
 23° /11° 1.2 mm 6
13 Sept. Moderate rain
Moderate rain
 21° /13° 5.6 mm 4
14 Sept. Overcast
Overcast
 20° /12° 0.3 mm 5
15 Sept. Mist
Mist
 23° /11° 0.1 mm 5
16 Sept. Overcast
Overcast
 24° /13° 0.1 mm 5
17 Sept. Partly cloudy
Partly cloudy
 25° /12° 0 mm 5
18 Sept. Sunny
Sunny
 18° /8° 0 mm 4.8
19 Sept. Sunny
Sunny
 14° /4° 0 mm 4.9
20 Sept. Overcast
Overcast
 18° /6° 0 mm 4.6
21 Sept. Overcast
Overcast
 15° /5° 0 mm 4.7
22 Sept. Overcast
Overcast
 15° /5° 0 mm 3
23 Sept. Overcast
Overcast
 17° /6° 0 mm 5
24 Sept. Overcast
Overcast
 17° /9° 0 mm 4
25 Sept. Light rain shower
Light rain shower
 12° /7° 4.6 mm 3
26 Sept. Overcast
Overcast
 9° /6° 0.1 mm 3
27 Sept. Overcast
Overcast
 16° /5° 0 mm 5
28 Sept. Overcast
Overcast
 21° /11° 0 mm 6
29 Sept. Overcast
Overcast
 24° /16° 1.5 mm 5
30 Sept. Overcast
Overcast
 26° /15° 1.6 mm 6
Next
Important Notice
Our weather forecast for Kirkland in September is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Kirkland forecast closer to your planned date for the most up-to-date weather information.
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Kirkland in September - FAQ

What are the expected maximum and minimum temperatures in Kirkland during September?
Enjoy moderate daytime temperatures of up to 22° and cooler nights around 12°. Ideal for a range of outdoor activities, from hiking to city tours.

How much rainfall should be expected in Kirkland during September?
Significant rainfall exceeding 142.3 mm is expected in Kirkland during September, occurring over more than 14 days. Preparing for wet conditions is recommended in your planning.

What are the typical wind conditions in Kirkland during September?
The average wind speed in Kirkland during September is 14 km/h, suggesting breezy to windy conditions, depending on your activities.

September rainfall patterns in Kirkland

Explore the daily rainfall trends and prepare for Kirklands September weather 💧
Typically, Kirkland has 14 rainy days in September with a total of 142.3 mm of rainfall.

UV exposure in Kirkland during September

Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️

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Location coordinates Where is Kirkland?

Get accurate weather forecasts for Kirkland, located at latitude 45.45 and longitude -73.866. Stay updated with localized weather information tailored for Kirkland.

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