This page presents a long range weather forecast for Portland in May as well as other months. You can quickly get a brief overview of the weather to expect in May on a daily basis.
The Portland extended forecast data provided is based on the average values of previous years.
Long range weather forecast
Select a month and click on a day for more information:
Wednesday
May 1
16° / 7°
Thursday
May 2
15° / 8°
Friday
May 3
16° / 7°
Saturday
May 4
9° / 6°
Sunday
May 5
9° / 6°
Monday
May 6
10° / 5°
Tuesday
May 7
15° / 3°
Wednesday
May 8
15° / 6°
Thursday
May 9
23° / 5°
Friday
May 10
27° / 9°
Saturday
May 11
28° / 12°
Sunday
May 12
27° / 14°
Monday
May 13
23° / 11°
Tuesday
May 14
18° / 8°
Wednesday
May 15
13° / 7°
Thursday
May 16
21° / 6°
Friday
May 17
24° / 8°
Saturday
May 18
21° / 11°
Sunday
May 19
20° / 9°
Monday
May 20
19° / 8°
Tuesday
May 21
20° / 8°
Wednesday
May 22
19° / 8°
Thursday
May 23
19° / 10°
Friday
May 24
18° / 9°
Saturday
May 25
18° / 10°
Sunday
May 26
24° / 11°
Monday
May 27
21° / 12°
Tuesday
May 28
21° / 11°
Wednesday
May 29
23° / 11°
Thursday
May 30
21° / 10°
Friday
May 31
23° / 10°
Portland 30 days weather forecast
Check out our estimated 30 days weather forecast for Portland, this data is based on the average weather in Portland in the last few years.
For a more accurate and detailed forecast, check out the 14 day weather for Portland next to the desired date.