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Weather in Portland for May 2027

Your guide to Portland weather in May - trends and predictions

    Temperatures

  • In general, the average temperature in Portland at the beginning of May is 13.6 °C. As the month progressed, temperatures tended to significantly warm up, reaching an average of 20.6 °C by the end of May.

    • Rain 🌧️

  • Portland in May brings notable rainfall, with an average of 16 rainy days and a total precipitation of 48.1 mm.

    • More

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Average dry days
15
Dry days
Average rainy days
16
Rainy days
Average snowy days
0
Snow days
Average temperatures
16°/10°
Temperatures
Average wind speed
23 km/h
Avg max wind
Average humidity
81 %
Avg humidity

Portland Weather May

Move between months or click on a day
April
June
Mon.Tue.Wed.Thu.Fri.Sat.Sun.
1
Overcast
14°
2
Moderate or heavy rain shower
14°
3
Overcast
13°
4
Overcast
14°
5
Patchy rain possible
15°
6
Moderate or heavy rain shower
12°
7
Patchy rain possible
13°
8
Patchy rain possible
14°
9
Overcast
19°
10
Overcast
16°
11
Moderate rain at times
12°
12
Overcast
14°
13
Patchy rain possible
12°
14
Heavy rain at times
11°
15
Patchy rain possible
12°
16
Patchy rain possible
12°
17
Patchy rain possible
12°
18
Moderate rain at times
11°
19
Patchy rain possible
13°
20
Patchy rain possible
13°
21
Overcast
16°
22
Sunny
19°
23
Cloudy
22°
24
Sunny
23°
25
Sunny
25°
26
Sunny
22°
27
Moderate or heavy rain shower
23°
28
Moderate rain at times
20°
29
Patchy rain possible
18°
30
Partly cloudy
20°
31
Patchy rain possible
16°

Temperatures trend during May in Portland

See the weather trend as well as the moving average line

May weather in Portland day by day

Click on a date for more information
April June
Date Weather Temperatures Rain UV More
1 May Overcast
Overcast
 14° /10° 0 mm 5
2 May Moderate or heavy rain shower
Moderate or heavy rain shower
 14° /9° 5.7 mm 3
3 May Overcast
Overcast
 13° /9° 0 mm 2
4 May Overcast
Overcast
 14° /11° 0 mm 3
5 May Patchy rain possible
Patchy rain possible
 15° /10° 0.5 mm 2
6 May Moderate or heavy rain shower
Moderate or heavy rain shower
 12° /9° 4.5 mm 2
7 May Patchy rain possible
Patchy rain possible
 13° /8° 0.7 mm 3
8 May Patchy rain possible
Patchy rain possible
 14° /11° 0.2 mm 5
9 May Overcast
Overcast
 19° /10° 0 mm 6
10 May Overcast
Overcast
 16° /8° 0 mm 6
11 May Moderate rain at times
Moderate rain at times
 12° /5° 1.5 mm 6
12 May Overcast
Overcast
 14° /6° 0 mm 6
13 May Patchy rain possible
Patchy rain possible
 12° /9° 1.7 mm 3
14 May Heavy rain at times
Heavy rain at times
 11° /7° 3.5 mm 2
15 May Patchy rain possible
Patchy rain possible
 12° /5° 0.7 mm 3
16 May Patchy rain possible
Patchy rain possible
 12° /6° 2.2 mm 4
17 May Patchy rain possible
Patchy rain possible
 12° /9° 0.9 mm 3
18 May Moderate rain at times
Moderate rain at times
 11° /9° 8.1 mm 2
19 May Patchy rain possible
Patchy rain possible
 13° /11° 11.2 mm 2
20 May Patchy rain possible
Patchy rain possible
 13° /11° 1.5 mm 6
21 May Overcast
Overcast
 16° /12° 0 mm 7
22 May Sunny
Sunny
 19° /12° 0 mm 7
23 May Cloudy
Cloudy
 22° /13° 0 mm 7
24 May Sunny
Sunny
 23° /13° 0 mm 7
25 May Sunny
Sunny
 25° /15° 0 mm 7
26 May Sunny
Sunny
 22° /16° 0 mm 7
27 May Moderate or heavy rain shower
Moderate or heavy rain shower
 23° /17° 3.5 mm 6
28 May Moderate rain at times
Moderate rain at times
 20° /15° 1.2 mm 7
29 May Patchy rain possible
Patchy rain possible
 18° /13° 0.4 mm 8
30 May Partly cloudy
Partly cloudy
 20° /11° 0 mm 7
31 May Patchy rain possible
Patchy rain possible
 16° /13° 0.1 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 16° and cooler nights around 10°. Ideal for a range of outdoor activities, from hiking to city tours.

How much rainfall should be expected in Portland during May?

In May, Portland can expect light to moderate rainfall, totaling 48.1 mm across approximately 16 days. Occasional showers are possible, and planning ahead for them could be helpful.

What are the typical wind conditions in Portland during May?

The average wind speed in Portland during May is 23 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 16 rainy days in May with a total of 48.1 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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Location coordinates Where is Portland?

Get accurate weather forecasts for Portland, located at latitude 50.567 and longitude -2.445. Stay updated with localized weather information tailored for Portland.

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