Oregon (Portland)
May
Weather in Oregon for May 2026
Your guide to Oregon weather in May - trends and predictions
In general, the average temperature in Oregon at the beginning of May is 16.1 °F. As the month progressed, temperatures tended to significantly warm up, reaching an average of 21.9 °F by the end of May.
The climate of Oregon in May is notably wet, with an average of 11 rainy days, and a total of 67.8 mm of precipitation.
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Temperatures
Rain 🌧️
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20
Dry days
11
Rainy days
0
Snow days
20°/8°
Temperatures
12 km/h
Avg max wind
69 %
Avg humidity
Oregon Weather May
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What’s the Weather Like in Oregon This May?
Discover the average temperatures and weather trends across Oregon’s cities this May.
Temperatures trend during May in Oregon
See the weather trend as well as the moving average line
May weather in Oregon day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| May 1 |  Patchy rain possible | 19° /6° | 0.2 mm | 4 | |
| May 2 |  Overcast | 18° /9° | 1.3 mm | 4 | |
| May 3 | Overcast | 16° /8° | 5.9 mm | 4 | |
| May 4 |  Moderate or heavy rain shower | 13° /6° | 15.8 mm | 3 | |
| May 5 | Patchy rain possible | 14° /6° | 3.6 mm | 4 | |
| May 6 | Patchy rain possible | 17° /8° | 4.3 mm | 4 | |
| May 7 | Moderate or heavy rain shower | 16° /7° | 1.5 mm | 4 | |
| May 8 | Overcast | 16° /4° | 4.4 mm | 4 | |
| May 9 | Patchy rain possible | 21° /7° | 0.1 mm | 5 | |
| May 10 |  Sunny | 22° /10° | 0 mm | 6 | |
| May 11 |  Partly cloudy | 21° /10° | 0.5 mm | 5 | |
| May 12 | Sunny | 23° /9° | 1 mm | 5 | |
| May 13 | Sunny | 21° /9° | 0 mm | 5 | |
| May 14 | Overcast | 23° /9° | 0 mm | 6 | |
| May 15 | Moderate rain at times | 22° /10° | 4.3 mm | 5 | |
| May 16 | Overcast | 19° /10° | 0 mm | 4 | |
| May 17 | Sunny | 21° /10° | 5.9 mm | 5 | |
| May 18 | Partly cloudy | 19° /9° | 0.9 mm | 5 | |
| May 19 | Sunny | 19° /9° | 0.2 mm | 5 | |
| May 20 | Sunny | 20° /8° | 2.7 mm | 5 | |
| May 21 |  Cloudy | 16° /9° | 2.9 mm | 4 | |
| May 22 | Patchy rain possible | 16° /8° | 1.9 mm | 4 | |
| May 23 | Patchy rain possible | 17° /7° | 1.2 mm | 4 | |
| May 24 | Partly cloudy | 21° /7° | 0.1 mm | 5 | |
| May 25 | Sunny | 20° /9° | 1 mm | 5 | |
| May 26 | Overcast | 22° /11° | 0 mm | 5 | |
| May 27 | Patchy rain possible | 25° /9° | 0.1 mm | 6 | |
| May 28 | Partly cloudy | 23° /11° | 1 mm | 6 | |
| May 29 | Partly cloudy | 20° /9° | 3.2 mm | 5 | |
| May 30 | Partly cloudy | 23° /7° | 0 mm | 6 | |
| May 31 | Overcast | 20° /8° | 0 mm | 5 | |
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Important Notice
Our weather forecast for Oregon 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 Oregon forecast closer to your planned date for the most up-to-date weather information.
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Oregon in May - FAQ
What are the expected maximum and minimum temperatures in Oregon during May?
Enjoy moderate daytime temperatures of up to 20° and cooler nights around 8°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Oregon during May?
Moderate rainfall is anticipated in Oregon during May, with a total of 67.8 mm spread over approximately 11 days. Considering plans for rainy days is advisable.
What are the typical wind conditions in Oregon during May?
The average wind speed in Oregon during May is 12 km/h, suggesting breezy to windy conditions, depending on your activities.
May rainfall patterns in Oregon
Explore the daily rainfall trends and prepare for Oregons May weather 💧
UV exposure in Oregon during May
Stay informed about UV levels for safe outdoor activities throughout the month of May ☀️
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