Portland
May
Weather in Portland for May 2025
Your guide to Portland weather in May - trends and predictions
The forecast for the first days of May 2025 in Portland predicts a temperature of 13.2 °F, which is slightly above the historical average.
In general, the average temperature in Portland at the beginning of May is 11.9 °F. As the month progressed, temperatures tended to significantly warm up, reaching an average of 18.4 °F by the end of May.
The climate of Portland in May is notably wet, with an average of 13 rainy days, and a total of 72.5 mm of precipitation.
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Temperatures
Rain 🌧️
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18
Dry days
13
Rainy days
0
Snow days
16°/9°
Temperatures
15 km/h
Avg max wind
77 %
Avg humidity
Portland Weather May
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| Sun. | Mon. | Tue. | Wed. | Thu. | Fri. | Sat. |
|---|---|---|---|---|---|---|
| 1  13° | 2  12° | 3 12° | ||||
| 4 12° | 5  10° | 6 11° | 7 13° | 8 11° | 9  9° | 10 11° |
| 11 10° | 12 11° | 13 13° | 14  18° | 15 20° | 16 19° | 17 16° |
| 18  15° | 19 15° | 20 18° | 21  22° | 22 28° | 23 25° | 24 24° |
| 25 19° | 26 20° | 27 12° | 28 22° | 29 18° | 30 19° | 31 19° |
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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 | Sunny | 13° /7° | 0 mm | 3 | |
| May 2 | Patchy rain possible | 12° /9° | 4.1 mm | 3 | |
| May 3 | Sunny | 12° /7° | 0 mm | 3 | |
| May 4 | Sunny | 12° /5° | 0 mm | 3 | |
| May 5 | Moderate rain | 10° /8° | 8.1 mm | 2 | |
| May 6 | Patchy rain possible | 11° /10° | 2.8 mm | 3 | |
| May 7 | Patchy rain possible | 13° /9° | 0.6 mm | 3 | |
| May 8 | Light rain shower | 11° /8° | 9.4 mm | 3 | |
| May 9 | Light drizzle | 9° /7° | 5.3 mm | 2 | |
| May 10 | Patchy rain possible | 11° /6° | 0.1 mm | 3 | |
| May 11 | Patchy rain possible | 10° /6° | 0.1 mm | 3 | |
| May 12 | Light rain shower | 11° /6° | 0.7 mm | 3 | |
| May 13 | Patchy rain possible | 13° /6° | 2.2 mm | 3 | |
| May 14 | Moderate or heavy rain shower | 18° /10° | 10.9 mm | 4 | |
| May 15 | Light drizzle | 20° /12° | 1.3 mm | 5 | |
| May 16 | Patchy rain possible | 19° /12° | 0.2 mm | 4 | |
| May 17 | Patchy rain possible | 16° /10° | 0.1 mm | 4 | |
| May 18 | Partly cloudy | 15° /9° | 0 mm | 5 | |
| May 19 | Patchy rain possible | 15° /10° | 0.3 mm | 4 | |
| May 20 | Partly cloudy | 18° /8° | 0 mm | 5 | |
| May 21 | Mist | 22° /10° | 0 mm | 5 | |
| May 22 | Fog | 28° /15° | 0.5 mm | 6 | |
| May 23 | Light rain shower | 25° /16° | 2.6 mm | 6 | |
| May 24 | Partly cloudy | 24° /13° | 0 mm | 6 | |
| May 25 | Sunny | 19° /9° | 0 mm | 5 | |
| May 26 | Patchy rain possible | 20° /12° | 0.8 mm | 5 | |
| May 27 | Light rain shower | 12° /10° | 18.3 mm | 3 | |
| May 28 | Fog | 22° /14° | 5 mm | 5 | |
| May 29 | Light rain shower | 18° /12° | 3 mm | 4 | |
| May 30 | Partly cloudy | 19° /9° | 0 mm | 5 | |
| May 31 | Partly cloudy | 19° /9° | 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 16° 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 72.5 mm spread over approximately 13 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 15 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 💧
UV exposure in Portland during May
Stay informed about UV levels for safe outdoor activities throughout the month of May ☀️
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