Multnomah County (Portland)
May
Weather in Multnomah County for May 2025
Your guide to Multnomah County weather in May - trends and predictions
In general, the average temperature in Multnomah County 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.
Multnomah County 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
Multnomah County 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 Multnomah County
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 Multnomah County 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 Multnomah County forecast closer to your planned date for the most up-to-date weather information.
Multnomah County in May - FAQ
What are the expected maximum and minimum temperatures in Multnomah County 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 Multnomah County during May?
Significant rainfall exceeding 127.7 mm is expected in Multnomah County during May, occurring over more than 6 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Multnomah County during May?
The average wind speed in Multnomah County during May is 13 km/h, suggesting breezy to windy conditions, depending on your activities.
May rainfall patterns in Multnomah County
Explore the daily rainfall trends and prepare for Multnomah Countys May weather 💧
UV exposure in Multnomah County during May
Stay informed about UV levels for safe outdoor activities throughout the month of May ☀️
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Where is Multnomah County?Get accurate weather forecasts for Multnomah County, located at latitude 45.523 and longitude -122.676. Stay updated with localized weather information tailored for Multnomah County.
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