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Weather in Portland for September 2025

Your guide to Portland weather in September - trends and predictions

    Temperatures

  • In general, the average temperature in Portland at the beginning of September is 22.1 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 17 °F by the end of September.

    • Rain 🌧️

  • With an average of 5 rainy days, Portland experiences minimal rainfall in September.

    • More

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Average dry days
25
Dry days
Average rainy days
5
Rainy days
Average snowy days
0
Snow days
Average temperatures
20°/13°
Temperatures
Average wind speed
15 km/h
Avg max wind
Average humidity
74 %
Avg humidity

Portland Weather September

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

See the weather trend as well as the moving average line

September weather day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
Sept. 1 Light rain shower
Light rain shower
 24° /18° 5.7 mm 5
Sept. 2 Partly cloudy
Partly cloudy
 22° /12° 0 mm 6
Sept. 3 Sunny
Sunny
 21° /9° 0 mm 6
Sept. 4 Sunny
Sunny
 24° /12° 0 mm 6
Sept. 5 Sunny
Sunny
 23° /14° 0 mm 6
Sept. 6 Mist
Mist
 20° /12° 0 mm 5
Sept. 7 Mist
Mist
 21° /12° 1.5 mm 5
Sept. 8 Sunny
Sunny
 19° /12° 0.4 mm 5
Sept. 9 Sunny
Sunny
 21° /10° 0 mm 6
Sept. 10 Partly cloudy
Partly cloudy
 21° /11° 0 mm 6
Sept. 11 Sunny
Sunny
 22° /10° 0 mm 6
Sept. 12 Partly cloudy
Partly cloudy
 23° /12° 0 mm 6
Sept. 13 Patchy rain possible
Patchy rain possible
 25° /14° 0 mm 6
Sept. 14 Patchy rain possible
Patchy rain possible
 22° /15° 0.1 mm 5
Sept. 15 Partly cloudy
Partly cloudy
 23° /14° 0 mm 6
Sept. 16 Sunny
Sunny
 25° /14° 0 mm 7
Sept. 17 Fog
Fog
 23° /13° 0 mm 5
Sept. 18 Mist
Mist
 22° /14° 0 mm 5
Sept. 19 Mist
Mist
 16° /13° 0 mm 4
Sept. 20 Moderate rain at times
Moderate rain at times
 17° /14° 4.1 mm 4
Sept. 21 Overcast
Overcast
 18° /14° 6.6 mm 4
Sept. 22 Overcast
Overcast
 16° /12° 0 mm 4
Sept. 23 Overcast
Overcast
 15° /13° 0 mm 4
Sept. 24 Cloudy
Cloudy
 17° /12° 0 mm 4
Sept. 25 Mist
Mist
 15° /10° 0 mm 4
Sept. 26 Heavy rain
Heavy rain
 15° /14° 151.5 mm 4
Sept. 27 Fog
Fog
 19° /12° 0 mm 4
Sept. 28 Cloudy
Cloudy
 17° /14° 0 mm 4
Sept. 29 Mist
Mist
 17° /13° 0 mm 4
Sept. 30 Cloudy
Cloudy
 19° /14° 0 mm 4
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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.

Portland in September - FAQ

What are the expected maximum and minimum temperatures in Portland during September?
Enjoy moderate daytime temperatures of up to 20° 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?
Significant rainfall exceeding 169.9 mm is expected in Portland during September, occurring over more than 5 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Portland during September?
The average wind speed in Portland during September is 15 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 💧

UV exposure in Portland during September

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

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Location coordinates Where is Portland?

Get accurate weather forecasts for Portland, located at latitude 43.657 and longitude -70.259. Stay updated with localized weather information tailored for Portland.

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