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Weather in Boulder County for May 2025

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 15.4 °F. As the month progressed, temperatures tended to significantly warm up, reaching an average of 22.1 °F by the end of May.

  • Rain 🌧️

  • The climate of Boulder County in May is notably wet, with an average of 15 rainy days, and a total of 41.9 mm of precipitation.

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Average dry days
16
Dry days
Average rainy days
15
Rainy days
Average snowy days
0
Snow days
Average temperatures
18°/6°
Temperatures
Average wind speed
22 km/h
Avg max wind
Average humidity
51 %
Avg humidity

Boulder County Weather May

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Temperatures trend during May in Boulder County

See the weather trend as well as the moving average line

May weather day by day

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Date Weather Temperatures Rain UV More
May 1 Moderate rain at times
Moderate rain at times
14° /5° 0.6 mm 3
May 2 Partly cloudy
Partly cloudy
15° /2° 0.4 mm 5
May 3 Patchy rain possible
Patchy rain possible
18° /3° 0.3 mm 4
May 4 Overcast
Overcast
15° /3° 0 mm 4
May 5 Overcast
Overcast
23° /5° 0 mm 5
May 6 Patchy rain possible
Patchy rain possible
12° /6° 1.8 mm 3
May 7 Patchy rain possible
Patchy rain possible
11° /1° 0.3 mm 3
May 8 Cloudy
Cloudy
11° /0° 0 mm 3
May 9 Overcast
Overcast
8° /2° 2.4 mm 2
May 10 Moderate rain at times
Moderate rain at times
11° /3° 1.9 mm 3
May 11 Patchy rain possible
Patchy rain possible
16° /3° 0.7 mm 4
May 12 Moderate or heavy rain shower
Moderate or heavy rain shower
16° /7° 7.9 mm 4
May 13 Patchy rain possible
Patchy rain possible
19° /6° 0.2 mm 4
May 14 Overcast
Overcast
22° /8° 0 mm 5
May 15 Moderate or heavy rain shower
Moderate or heavy rain shower
14° /8° 3.3 mm 3
May 16 Cloudy
Cloudy
19° /6° 0 mm 4
May 17 Cloudy
Cloudy
24° /10° 0 mm 5
May 18 Overcast
Overcast
21° /11° 0 mm 5
May 19 Cloudy
Cloudy
24° /9° 0 mm 5
May 20 Patchy rain possible
Patchy rain possible
18° /7° 8.1 mm 4
May 21 Moderate or heavy rain shower
Moderate or heavy rain shower
12° /5° 8.1 mm 3
May 22 Partly cloudy
Partly cloudy
18° /3° 0 mm 5
May 23 Cloudy
Cloudy
22° /8° 0.1 mm 5
May 24 Overcast
Overcast
17° /3° 0 mm 4
May 25 Heavy rain at times
Heavy rain at times
21° /8° 2.3 mm 5
May 26 Sunny
Sunny
20° /8° 0 mm 6
May 27 Sunny
Sunny
22° /9° 0 mm 6
May 28 Cloudy
Cloudy
22° /9° 0 mm 5
May 29 Cloudy
Cloudy
25° /11° 0 mm 6
May 30 Overcast
Overcast
23° /9° 2.5 mm 5
May 31 Patchy light drizzle
Patchy light drizzle
22° /8° 1.1 mm 5
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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.

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?
In May, Boulder County can expect light to moderate rainfall, totaling 41.9 mm across approximately 15 days. Occasional showers are possible, and planning ahead for them could be helpful.
What are the typical wind conditions in Boulder County during May?
The average wind speed in Boulder County during May is 22 km/h, suggesting breezy to windy conditions, depending on your activities.

May rainfall patterns in Boulder County

Explore the daily rainfall trends and prepare for Boulder Countys May weather 💧

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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Location coordinates Where is Boulder County?

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

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