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Weather in Portland for May 2025

Your guide to Portland weather in May - trends and predictions

    Temperatures

  • In general, the average temperature in Portland at the beginning of May is 13 °F. As the month progressed, temperatures tended to significantly warm up, reaching an average of 18.4 °F by the end of May.

  • Rain 🌧️

  • 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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Average dry days
18
Dry days
Average rainy days
13
Rainy days
Average snowy days
0
Snow days
Average temperatures
16°/9°
Temperatures
Average wind speed
15 km/h
Avg max wind
Average humidity
77 %
Avg humidity

Portland Weather May

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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

Click on a date for more information
Date Weather Temperatures Rain UV More
May 1 Patchy rain possible
Patchy rain possible
11° /5° 1.6 mm 3
May 2 Light rain shower
Light rain shower
10° /7° 3.3 mm 3
May 3 Patchy rain possible
Patchy rain possible
13° /7° 0.1 mm 3
May 4 Overcast
Overcast
11° /7° 0 mm 3
May 5 Light rain
Light rain
11° /5° 4.8 mm 3
May 6 Fog
Fog
16° /8° 2 mm 4
May 7 Partly cloudy
Partly cloudy
19° /9° 0 mm 5
May 8 Light rain shower
Light rain shower
11° /8° 9.4 mm 3
May 9 Light drizzle
Light drizzle
9° /7° 5.3 mm 2
May 10 Patchy rain possible
Patchy rain possible
11° /6° 0.1 mm 3
May 11 Patchy rain possible
Patchy rain possible
10° /6° 0.1 mm 3
May 12 Light rain shower
Light rain shower
11° /6° 0.7 mm 3
May 13 Patchy rain possible
Patchy rain possible
13° /6° 2.2 mm 3
May 14 Moderate or heavy rain shower
Moderate or heavy rain shower
18° /10° 10.9 mm 4
May 15 Light drizzle
Light drizzle
20° /12° 1.3 mm 5
May 16 Patchy rain possible
Patchy rain possible
19° /12° 0.2 mm 4
May 17 Patchy rain possible
Patchy rain possible
16° /10° 0.1 mm 4
May 18 Partly cloudy
Partly cloudy
15° /9° 0 mm 5
May 19 Patchy rain possible
Patchy rain possible
15° /10° 0.3 mm 4
May 20 Partly cloudy
Partly cloudy
18° /8° 0 mm 5
May 21 Mist
Mist
22° /10° 0 mm 5
May 22 Fog
Fog
28° /15° 0.5 mm 6
May 23 Light rain shower
Light rain shower
25° /16° 2.6 mm 6
May 24 Partly cloudy
Partly cloudy
24° /13° 0 mm 6
May 25 Sunny
Sunny
19° /9° 0 mm 5
May 26 Patchy rain possible
Patchy rain possible
20° /12° 0.8 mm 5
May 27 Light rain shower
Light rain shower
12° /10° 18.3 mm 3
May 28 Fog
Fog
22° /14° 5 mm 5
May 29 Light rain shower
Light rain shower
18° /12° 3 mm 4
May 30 Partly cloudy
Partly cloudy
19° /9° 0 mm 5
May 31 Partly cloudy
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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Location coordinates Where is Portland?

Get accurate weather forecasts for Portland, located at latitude 43.657 and longitude -70.259. Stay updated with localized weather information tailored for Portland.

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