Average data for 10 years
1 May
Wednesday
+10°
+8°
2 May
Thursday
+11°
+8°
3 May
Friday
+12°
+8°
4 May
Saturday
+11°
+9°
5 May
Sunday
+12°
+8°
6 May
Monday
+13°
+9°
7 May
Tuesday
+11°
+10°
8 May
Wednesday
+11°
+9°
9 May
Thursday
+13°
+9°
10 May
Friday
+13°
+9°
11 May
Saturday
+14°
+10°
12 May
Sunday
+13°
+9°
13 May
Monday
+12°
+9°
14 May
Tuesday
+13°
+10°
15 May
Wednesday
+14°
+10°
16 May
Thursday
+14°
+11°
17 May
Friday
+13°
+11°
18 May
Saturday
+13°
+10°
19 May
Sunday
+15°
+11°
20 May
Monday
+15°
+12°
21 May
Tuesday
+13°
+11°
22 May
Wednesday
+13°
+10°
23 May
Thursday
+17°
+12°
24 May
Friday
+15°
+13°
25 May
Saturday
+16°
+12°
26 May
Sunday
+16°
+13°
27 May
Monday
+14°
+12°
28 May
Tuesday
+15°
+11°
29 May
Wednesday
+16°
+12°
30 May
Thursday
+16°
+13°
31 May
Friday
+17°
+13°
May in Portland is the rainiest and the cloudiest month of the year. In May, the weather in Portland is typically warm. Average daily high temperature in May is about 14 degrees above zero. On average, Portland has 15 rainy, 6 sunny, 5 cloudy, and 5 partly cloudy days in May. The rains are usually moderate. May as well as February, March, April, and December is considered the most uncomfortable time to visit Portland.