Overall on the next 14 days there will be 1 days with snow in Boulder and a total of 13.4 cm of snow.
It will be snowy on the following days:
Boulder weather in May 2026
Click on a day for an hourly weather forecast
Wednesday
May 6
13.4 cm
1° / -6°
Thursday
May 7
0.5 mm
16° / -5°
Friday
May 8
0.8 mm
18° / 3°
Saturday
May 9
0 mm
21° / 6°
Sunday
May 10
0.3 mm
20° / 1°
Monday
May 11
0 mm
28° / 8°
Tuesday
May 12
0 mm
29° / 9°
Wednesday
May 13
0 mm
29° / 13°
Thursday
May 14
0.3 mm
28° / 14°
Friday
May 15
0 mm
24° / 9°
Saturday
May 16
0 mm
24° / 6°
Sunday
May 17
1.5 mm
21° / 7°
Monday
May 18
6.5 mm
18° / 10°
Tuesday
May 19
0 mm
23° / 5°
🌨️ Snowy days in Boulder 2026 (May)
The average weather in Boulder in May
The temperatures in Boulder in May are quite cold with temperatures between 5°C and 15°C, warm clothes are a must.
You can expect rain for roughly half of the month of May in Boulder. We’re expecting roughly 8 to 15 days of rain, so your rubber boots and umbrella are going to see plenty of use this month if you’re keen on staying dry.
You can expect a few days of snow in Boulder during May. It’s important to get out your snow boots and warm mittens to stay warm while you explore Boulder.
Our weather forecast can give you a great sense of what weather to expect in Boulder in May 2026.
If you’re planning to visit Boulder in the near future, we highly recommend that you review the 14 day weather forecast for Boulder before you arrive.
Temperatures
15° / 5°
Rainy Days
11
Snowy Days
3
Dry Days
17
Rainfall
160
mm
Sun Hours
10.9
Hrs
Historic average weather for May
Click on a day for an hourly weather forecast
Explore the weather in Boulder in other months
Boulder annual weather
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 2° / -8° | 4 | 16 | 10 | 27 mm | Awful | Boulder in January |
| February | 1° / -8° | 4 | 10 | 14 | 54 mm | Awful | Boulder in February |
| March | 7° / -3° | 4 | 17 | 10 | 83 mm | Bad | Boulder in March |
| April | 11° / 0° | 6 | 17 | 7 | 95 mm | Bad | Boulder in April |
| May | 15° / 5° | 11 | 17 | 3 | 160 mm | Bad | Boulder in May |
| June | 23° / 12° | 7 | 23 | 0 | 89 mm | Good | Boulder in June |
| July | 26° / 15° | 8 | 23 | 0 | 115 mm | Good | Boulder in July |
| August | 25° / 13° | 5 | 26 | 0 | 75 mm | Perfect | Boulder in August |
| September | 21° / 10° | 4 | 25 | 0 | 66 mm | Good | Boulder in September |
| October | 13° / 2° | 3 | 24 | 4 | 47 mm | Bad | Boulder in October |
| November | 7° / -3° | 2 | 21 | 7 | 33 mm | Bad | Boulder in November |
| December | 1° / -8° | 5 | 15 | 11 | 30 mm | Awful | Boulder in December |
Temperatures in Boulder in May
Rain in Boulder in May
Recommended Hotels in Boulder
Weather in Boulder in May - FAQ
What is the average temperature in Boulder in May?
The average temperature in Boulder in May is 5/15° C.
What is the chance of rain in Boulder in May?
On average, there are 11 rainy days in Boulder during May.
Weather wise, is May a good time to visit Boulder?
The weather in Boulder in May is bad.
Can it snow in Boulder in May?
On average, there are 3 snowy days in Boulder in May.
More about the weather in Boulder