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Weather in Portland for September 2026

Your guide to Portland weather in September - trends and predictions

    Temperatures

  • In general, the average temperature in Portland at the beginning of September is 18.1 °C. As the month progressed, temperatures tended to noticeably cool down, reaching an average of 15.3 °C by the end of September.

    • Rain 🌧️

  • Portland in September brings notable rainfall, with an average of 17 rainy days and a total precipitation of 83.2 mm.

    • More

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Average dry days
13
Dry days
Average rainy days
17
Rainy days
Average snowy days
0
Snow days
Average temperatures
16°/13°
Temperatures
Average wind speed
34 km/h
Avg max wind
Average humidity
77 %
Avg humidity

Portland Weather September

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

Temperatures trend during September in Portland

See the weather trend as well as the moving average line

September weather in Portland day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
1 Sept. Light rain shower
Light rain shower
 17° /14° 8 mm 1
2 Sept. Light rain shower
Light rain shower
 18° /15° 7.7 mm 4
3 Sept. Light rain shower
Light rain shower
 18° /16° 8.6 mm 1
4 Sept. Light rain shower
Light rain shower
 18° /14° 15.1 mm 3
5 Sept. Overcast
Overcast
 17° /14° 0 mm 5
6 Sept. Overcast
Overcast
 20° /15° 0 mm 5
7 Sept. Light drizzle
Light drizzle
 19° /15° 1.1 mm 4
8 Sept. Patchy rain possible
Patchy rain possible
 16° /14° 0.1 mm 5
9 Sept. Light drizzle
Light drizzle
 17° /15° 3.4 mm 2
10 Sept. Light rain shower
Light rain shower
 16° /14° 3.2 mm 2
11 Sept. Patchy light drizzle
Patchy light drizzle
 16° /13° 3.4 mm 2
12 Sept. Light rain shower
Light rain shower
 15° /13° 5.6 mm 1
13 Sept. Light rain shower
Light rain shower
 15° /13° 7.3 mm 2
14 Sept. Light rain shower
Light rain shower
 18° /13° 3.7 mm 2
15 Sept. Patchy light drizzle
Patchy light drizzle
 16° /14° 1.4 mm 2
16 Sept. Patchy light drizzle
Patchy light drizzle
 16° /14° 0.7 mm 3
17 Sept. Patchy rain possible
Patchy rain possible
 17° /14° 1.6 mm 1
18 Sept. Patchy rain possible
Patchy rain possible
 17° /16° 0.1 mm 2
19 Sept. Overcast
Overcast
 18° /15° 0 mm 3
20 Sept. Light rain shower
Light rain shower
 17° /13° 1 mm 3
21 Sept. Light rain
Light rain
 12° /10° 10.2 mm 1
22 Sept. Partly cloudy
Partly cloudy
 14° /8° 0 mm 3
23 Sept. Partly cloudy
Partly cloudy
 15° /9° 0 mm 3
24 Sept. Patchy rain possible
Patchy rain possible
 16° /10° 0 mm 3
25 Sept. Overcast
Overcast
 16° /10° 0 mm 3
26 Sept. Patchy rain possible
Patchy rain possible
 14° /10° 0 mm 3
27 Sept. Light drizzle
Light drizzle
 15° /13° 0.8 mm 2
28 Sept. Patchy rain possible
Patchy rain possible
 16° /13° 0.2 mm 2
29 Sept. Overcast
Overcast
 15° /11° 0 mm 2
30 Sept. Sunny
Sunny
 15° /12° 0 mm 2
Next
Important Notice
Our weather forecast for Portland 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 Portland forecast closer to your planned date for the most up-to-date weather information.
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Portland in September - FAQ

What are the expected maximum and minimum temperatures in Portland during September?

Enjoy moderate daytime temperatures of up to 16° and cooler nights around 13°. Ideal for a range of outdoor activities, from hiking to city tours.

How much rainfall should be expected in Portland during September?

Moderate rainfall is anticipated in Portland during September, with a total of 83.2 mm spread over approximately 17 days. Considering plans for rainy days is advisable.

What are the typical wind conditions in Portland during September?

The average wind speed in Portland during September is 34 km/h, suggesting breezy to windy conditions, depending on your activities.

September rainfall patterns in Portland

Explore the daily rainfall trends and prepare for Portlands September weather 💧
Typically, Portland has 17 rainy days in September with a total of 83.2 mm of rainfall.

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Location coordinates Where is Portland?

Get accurate weather forecasts for Portland, located at latitude 50.567 and longitude -2.445. Stay updated with localized weather information tailored for Portland.

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