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United States weather

Weather in Boulder County, Colorado for May 2027

Your guide to Boulder County weather in May - trends and predictions

    Temperatures

  • In general, the average temperature in Boulder County at the beginning of May is 14.7 °C. As the month progressed, temperatures tended to significantly warm up, reaching an average of 20.5 °C by the end of May.

    • Rain 🌧️

  • The climate of Boulder County in May is notably wet, with an average of 11 rainy days, and a total of 150.4 mm of precipitation.

    • More

  • Is May a good time to visit Boulder County? check out the best time to travel to Boulder County page.

  • ✨ Is May a good time to visit Boulder County? – Ask the AI Weatherman

Average dry days
20
Dry days
Average rainy days
11
Rainy days
Average snowy days
0
Snow days
Average temperatures
18°/6°
Temperatures
Average wind speed
20 km/h
Avg max wind
Average humidity
54 %
Avg humidity

Boulder County Weather May

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

Temperatures trend during May in Boulder County

See the weather trend as well as the moving average line

May weather in Boulder County day by day

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

What are the expected maximum and minimum temperatures in Boulder County 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 County during May?
Significant rainfall exceeding 150.4 mm is expected in Boulder County during May, occurring over more than 11 days. Preparing for wet conditions is recommended in your planning.

Will it snow in Boulder County in May 2027?
Boulder County typically sees 1.1 cm of snowfall during May.

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

Boulder County snow forecast May 2027

Track daily snowfall levels and discover Boulder County’s snowy potential this May ❄️

May rainfall patterns in Boulder County

Explore the daily rainfall trends and prepare for Boulder Countys May weather 💧
Typically, Boulder County has 11 rainy days in May with a total of 150.4 mm of rainfall.

UV exposure in Boulder County during May

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