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