Portland (OR)
September
Weather in Portland, Oregon for September 2027
Your guide to Portland weather in September - trends and predictions
In general, the average temperature in Portland at the beginning of September is 25.8 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 20.6 °C by the end of September.
Portland experiences moderate rainfall in September, with an average of 6 rainy days and a total precipitation of 83.3 mm.
Is September a good time to visit Portland? check out the best time to travel to Portland page.
✨ Is September a good time to visit Portland? – Ask the AI Weatherman
Temperatures
Rain 🌧️
More
24
Dry days
6
Rainy days
0
Snow days
23°/13°
Temperatures
10 km/h
Avg max wind
64 %
Avg humidity
Portland Weather September
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Temperatures trend during September in Portland
See the weather trend as well as the moving average line
September weather in Portland day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Overcast | 27° /15° | 0.1 mm | 5 | |
| Sept. 2 |  Moderate rain | 26° /14° | 13.1 mm | 6 | |
| Sept. 3 |  Light rain | 24° /15° | 3.6 mm | 5 | |
| Sept. 4 | Light rain | 25° /13° | 6.4 mm | 5 | |
| Sept. 5 |  Sunny | 29° /15° | 0 mm | 6.7 | |
| Sept. 6 | Moderate rain | 26° /16° | 10.1 mm | 6 | |
| Sept. 7 | Overcast | 25° /14° | 0.1 mm | 5 | |
| Sept. 8 | Light rain | 26° /14° | 3.9 mm | 6 | |
| Sept. 9 | Light rain | 27° /14° | 7.6 mm | 6 | |
| Sept. 10 | Overcast | 24° /14° | 0 mm | 6 | |
| Sept. 11 | Light rain | 20° /13° | 2.8 mm | 4 | |
| Sept. 12 |  Patchy rain possible | 21° /12° | 1.2 mm | 4 | |
| Sept. 13 | Overcast | 22° /11° | 0.4 mm | 5 | |
| Sept. 14 | Patchy rain possible | 24° /12° | 1.2 mm | 5.9 | |
| Sept. 15 | Sunny | 25° /11° | 0.2 mm | 5 | |
| Sept. 16 | Sunny | 29° /13° | 0 mm | 5.7 | |
| Sept. 17 | Light rain | 24° /14° | 3 mm | 5.6 | |
| Sept. 18 | Overcast | 22° /13° | 0 mm | 5 | |
| Sept. 19 | Overcast | 24° /13° | 0 mm | 5.4 | |
| Sept. 20 | Sunny | 23° /13° | 0.3 mm | 5 | |
| Sept. 21 | Light rain | 22° /11° | 4.3 mm | 5 | |
| Sept. 22 | Sunny | 23° /12° | 0.1 mm | 5 | |
| Sept. 23 | Light rain shower | 24° /13° | 0.4 mm | 5 | |
| Sept. 24 | Patchy rain possible | 25° /13° | 1.8 mm | 5 | |
| Sept. 25 | Light rain | 19° /13° | 5.4 mm | 4 | |
| Sept. 26 | Light rain | 20° /11° | 2.7 mm | 4 | |
| Sept. 27 | Light rain | 22° /12° | 3.2 mm | 4.7 | |
| Sept. 28 | Overcast | 20° /11° | 0.1 mm | 4 | |
| Sept. 29 | Light rain | 18° /11° | 5 mm | 3 | |
| Sept. 30 | Light rain | 21° /11° | 6.2 mm | 4.4 | |
| 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.
Change Month
Portland in September - FAQ
What are the expected maximum and minimum temperatures in Portland during September?
Enjoy moderate daytime temperatures of up to 23° 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 83.3 mm spread over approximately 6 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 10 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 6 rainy days in September with a total of 83.3 mm of rainfall.
UV exposure in Portland during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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