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Weather in Boulder, Colorado for May 2027

Your guide to Boulder weather in May - trends and predictions

    Snow Forecast ❄️

  • Snowfall in Boulder during May is quite rare, with fewer than 2 snowy days on average.

    • Temperatures

  • In general, the average temperature in Boulder at the beginning of May is 15 °C. As the month progressed, temperatures tended to significantly warm up, reaching an average of 20.9 °C by the end of May.

    • Rain 🌧️

  • Boulder in May brings notable rainfall, with an average of 16 rainy days and a total precipitation of 165.4 mm.

    • More

  • New! Chat with our AI weatherman - it’s amazing and free.

Average dry days
14
Dry days
Average rainy days
16
Rainy days
Average snowy days
1
Snow days
Average temperatures
18°/6°
Temperatures
Average wind speed
20 km/h
Avg max wind
Average humidity
54 %
Avg humidity

Boulder Weather May

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

Temperatures trend during May in Boulder

See the weather trend as well as the moving average line

May weather in Boulder day by day

Click on a date for more information
April June
Date Weather Temperatures Rain Snow More
May 1 Overcast
Overcast
 13° /2° 1.4 mm 0 cm
May 2 Sunny
Sunny
 17° /1° 0.1 mm 0 cm
May 3 Patchy rain possible
Patchy rain possible
 20° /3° 0.1 mm 0 cm
May 4 Overcast
Overcast
 20° /6° 0.7 mm 0 cm
May 5 Overcast
Overcast
 14° /3° 17.2 mm 0 cm
May 6 Patchy rain possible
Patchy rain possible
 8° /0° 36.8 mm 1.1 cm
May 7 Patchy rain possible
Patchy rain possible
 13° /-1° 17.8 mm 0 cm
May 8 Cloudy
Cloudy
 16° /2° 0 mm 0 cm
May 9 Overcast
Overcast
 18° /5° 0.9 mm 0 cm
May 10 Moderate rain at times
Moderate rain at times
 18° /4° 0.7 mm 0 cm
May 11 Sunny
Sunny
 23° /6° 0.2 mm 0 cm
May 12 Sunny
Sunny
 22° /9° 2.6 mm 0 cm
May 13 Patchy rain possible
Patchy rain possible
 24° /9° 0.1 mm 0 cm
May 14 Overcast
Overcast
 22° /9° 0 mm 0 cm
May 15 Moderate or heavy rain shower
Moderate or heavy rain shower
 20° /7° 1.1 mm 0 cm
May 16 Cloudy
Cloudy
 21° /7° 0.5 mm 0 cm
May 17 Cloudy
Cloudy
 19° /8° 6 mm 0 cm
May 18 Overcast
Overcast
 15° /6° 7.1 mm 0 cm
May 19 Cloudy
Cloudy
 15° /5° 2 mm 0 cm
May 20 Patchy rain possible
Patchy rain possible
 17° /5° 5.5 mm 0 cm
May 21 Moderate or heavy rain shower
Moderate or heavy rain shower
 17° /6° 4.1 mm 0 cm
May 22 Partly cloudy
Partly cloudy
 20° /4° 0.2 mm 0 cm
May 23 Cloudy
Cloudy
 25° /6° 0 mm 0 cm
May 24 Overcast
Overcast
 19° /6° 5.2 mm 0 cm
May 25 Heavy rain at times
Heavy rain at times
 19° /7° 24.1 mm 0 cm
May 26 Sunny
Sunny
 18° /7° 7.4 mm 0 cm
May 27 Sunny
Sunny
 20° /8° 1.6 mm 0 cm
May 28 Cloudy
Cloudy
 19° /8° 0.9 mm 0 cm
May 29 Cloudy
Cloudy
 23° /8° 1.9 mm 0 cm
May 30 Overcast
Overcast
 23° /8° 3.9 mm 0 cm
May 31 Sunny
Sunny
 24° /7° 0.4 mm 0 cm
Next
Important Notice
Our weather forecast for Boulder 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 Boulder forecast closer to your planned date for the most up-to-date weather information.
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Boulder in May - FAQ

What are the expected maximum and minimum temperatures in Boulder during May?

Enjoy moderate daytime temperatures of up to 18° and cooler nights around 6°. Ideal for a range of outdoor activities, from hiking to city tours.

How much rainfall should be expected in Boulder during May?

Significant rainfall exceeding 165.4 mm is expected in Boulder during May, occurring over more than 16 days. Preparing for wet conditions is recommended in your planning.

Will it snow in Boulder in May 2027?

Boulder typically sees 1.07333 cm of snowfall during May.

What are the typical wind conditions in Boulder during May?

The average wind speed in Boulder during May is 20 km/h, suggesting breezy to windy conditions, depending on your activities.

Boulder snow forecast May 2027

Track daily snowfall levels and discover Boulder’s snowy potential this May ❄️
On average, Boulder sees 1 snowy days during May, with approximately 1.1 cm of total snowfall.

May rainfall patterns in Boulder

Explore the daily rainfall trends and prepare for Boulders May weather 💧
Typically, Boulder has 16 rainy days in May with a total of 165.4 mm of rainfall.

UV exposure in Boulder during May

Stay informed about UV levels for safe outdoor activities throughout the month of May ☀️

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Location coordinates Where is Boulder?

Get accurate weather forecasts for Boulder, located at latitude 40.015 and longitude -105.271. Stay updated with localized weather information tailored for Boulder.

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