Portland
May
Weather in Portland for May 2025
Your guide to Portland weather in May - trends and predictions
In general, the average temperature in Portland at the beginning of May is 13.6 °F. As the month progressed, temperatures tended to significantly warm up, reaching an average of 21.1 °F by the end of May.
Portland sees moderate rainfall in May, averaging 6 rainy days.
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25
Dry days
6
Rainy days
0
Snow days
23°/7°
Temperatures
13 km/h
Avg max wind
69 %
Avg humidity
Portland in May average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  14° | 2  17° | 3 16° | 4  11° | |||
| 5 11° | 6 13° | 7 13° | 8 15° | 9 21° | 10  25° | 11  25° |
| 12 27° | 13 25° | 14 27° | 15 27° | 16 23° | 17 24° | 18 22° |
| 19 21° | 20 23° | 21  15° | 22 15° | 23 18° | 24 20° | 25 20° |
| 26 24° | 27 23° | 28 20° | 29 21° | 30 20° | 31 20° |
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Temperatures trend during May in Portland
See the weather trend as well as the moving average line
May weather day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| May 1 | Patchy rain possible | 14° /5° | 0.3 mm | 3 | |
| May 2 | Overcast | 17° /8° | 1.9 mm | 4 | |
| May 3 | Overcast | 16° /7° | 8.9 mm | 4 | |
| May 4 | Moderate or heavy rain shower | 11° /6° | 23.7 mm | 3 | |
| May 5 | Patchy rain possible | 11° /6° | 5.4 mm | 3 | |
| May 6 | Patchy rain possible | 13° /6° | 6.4 mm | 3 | |
| May 7 | Moderate or heavy rain shower | 13° /5° | 2.3 mm | 3 | |
| May 8 | Moderate or heavy rain shower | 15° /4° | 6.6 mm | 4 | |
| May 9 | Patchy rain possible | 21° /6° | 0.2 mm | 5 | |
| May 10 | Sunny | 25° /9° | 0 mm | 7 | |
| May 11 | Partly cloudy | 25° /10° | 0 mm | 7 | |
| May 12 | Sunny | 27° /9° | 0 mm | 7 | |
| May 13 | Sunny | 25° /10° | 0 mm | 6 | |
| May 14 | Sunny | 27° /9° | 0 mm | 7 | |
| May 15 | Moderate rain at times | 27° /11° | 0.2 mm | 6 | |
| May 16 | Overcast | 23° /11° | 0 mm | 5 | |
| May 17 | Sunny | 24° /11° | 0.1 mm | 6 | |
| May 18 | Partly cloudy | 22° /10° | 0 mm | 6 | |
| May 19 | Sunny | 21° /9° | 0.3 mm | 5 | |
| May 20 | Sunny | 23° /8° | 0 mm | 6 | |
| May 21 | Cloudy | 15° /9° | 4.3 mm | 4 | |
| May 22 | Patchy rain possible | 15° /8° | 2.8 mm | 4 | |
| May 23 | Patchy rain possible | 18° /7° | 0.1 mm | 4 | |
| May 24 | Partly cloudy | 20° /7° | 0.2 mm | 5 | |
| May 25 | Sunny | 20° /8° | 1.5 mm | 5 | |
| May 26 | Sunny | 24° /10° | 0 mm | 6 | |
| May 27 | Patchy rain possible | 23° /9° | 0.2 mm | 6 | |
| May 28 | Partly cloudy | 20° /8° | 1.6 mm | 5 | |
| May 29 | Partly cloudy | 21° /7° | 0.8 mm | 6 | |
| May 30 | Partly cloudy | 20° /6° | 0 mm | 6 | |
| May 31 | Overcast | 20° /6° | 0 mm | 5 | |
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Important Notice
Our weather forecast for Portland in May 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 May - FAQ
What are the expected maximum and minimum temperatures in Portland during May?
Enjoy moderate daytime temperatures of up to 23° and cooler nights around 7°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Portland during May?
Significant rainfall exceeding 127.7 mm is expected in Portland during May, occurring over more than 6 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Portland during May?
The average wind speed in Portland during May is 13 km/h, suggesting breezy to windy conditions, depending on your activities.
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