Portland (OR)
May
Weather in Portland, Oregon for May 2027
Your guide to Portland weather in May - trends and predictions
In general, the average temperature in Portland at the beginning of May is 17.7 °F. As the month progressed, temperatures tended to significantly warm up, reaching an average of 21.3 °F by the end of May.
Portland experiences moderate rainfall in May, with an average of 8 rainy days and a total precipitation of 55.6 mm.
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Temperatures
Rain 🌧️
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23
Dry days
8
Rainy days
0
Snow days
20°/9°
Temperatures
12 km/h
Avg max wind
67 %
Avg humidity
Portland Weather May
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Temperatures trend during May in Portland
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May weather in Portland day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| May 1 |  Patchy rain possible | 19° /7° | 0.2 mm | 5 | |
| May 2 |  Overcast | 19° /9° | 1.7 mm | 4 | |
| May 3 | Overcast | 19° /9° | 4.5 mm | 5 | |
| May 4 | Overcast | 16° /7° | 11.8 mm | 4 | |
| May 5 | Patchy rain possible | 16° /7° | 2.7 mm | 5 | |
| May 6 | Patchy rain possible | 18° /9° | 3.2 mm | 5 | |
| May 7 | Overcast | 17° /7° | 1.1 mm | 5 | |
| May 8 | Overcast | 17° /6° | 3.3 mm | 5 | |
| May 9 | Patchy rain possible | 22° /7° | 0.1 mm | 6 | |
| May 10 |  Sunny | 22° /10° | 0 mm | 6 | |
| May 11 |  Partly cloudy | 22° /9° | 0.4 mm | 6 | |
| May 12 | Sunny | 24° /10° | 0.8 mm | 6 | |
| May 13 | Sunny | 19° /9° | 2.2 mm | 4 | |
| May 14 | Overcast | 22° /9° | 0.4 mm | 5 | |
| May 15 |  Moderate rain at times | 20° /10° | 4 mm | 5 | |
| May 16 | Overcast | 18° /9° | 1.4 mm | 4 | |
| May 17 | Patchy rain possible | 20° /9° | 4.6 mm | 6 | |
| May 18 | Overcast | 20° /8° | 0.7 mm | 6 | |
| May 19 | Overcast | 19° /8° | 0.1 mm | 5 | |
| May 20 | Overcast | 20° /8° | 2 mm | 6 | |
| May 21 |  Cloudy | 19° /9° | 2.2 mm | 5 | |
| May 22 | Patchy rain possible | 18° /9° | 1.4 mm | 5 | |
| May 23 | Patchy rain possible | 19° /8° | 0.9 mm | 5 | |
| May 24 | Partly cloudy | 22° /7° | 0.1 mm | 6 | |
| May 25 | Sunny | 19° /9° | 2 mm | 5 | |
| May 26 | Overcast | 20° /10° | 0.6 mm | 4 | |
| May 27 | Patchy rain possible | 24° /9° | 0.1 mm | 6 | |
| May 28 | Partly cloudy | 24° /11° | 0.8 mm | 7 | |
| May 29 | Partly cloudy | 20° /9° | 2.4 mm | 5 | |
| May 30 | Partly cloudy | 21° /7° | 0 mm | 7 | |
| May 31 | Overcast | 21° /8° | 0 mm | 6 | |
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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.
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Portland in May - FAQ
What are the expected maximum and minimum temperatures in Portland during May?
Enjoy moderate daytime temperatures of up to 20° and cooler nights around 9°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Portland during May?
Moderate rainfall is anticipated in Portland during May, with a total of 55.6 mm spread over approximately 8 days. Considering plans for rainy days is advisable.
What are the typical wind conditions in Portland during May?
The average wind speed in Portland during May is 12 km/h, suggesting breezy to windy conditions, depending on your activities.
May rainfall patterns in Portland
Explore the daily rainfall trends and prepare for Portlands May weather 💧
Typically, Portland has 8 rainy days in May with a total of 55.6 mm of rainfall.
UV exposure in Portland during May
Stay informed about UV levels for safe outdoor activities throughout the month of May ☀️
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