Boulder Weather in May
Boulder in May sees pleasant daytime temperatures of 21°C (70°F) and nighttime lows of 6°C (43°F). With the highest rainfall of the year it is wise to pack an umbrella and expect frequent showers.
Rainfall in Boulder in May
During the wettest month of the year, an umbrella can be your best friend to stay dry. Rain is expected on roughly 12 days, totalling around 80 mm (3.1 in) for the month. The rainfall pattern this month is fairly balanced. Showers tend to be moderate rather than extreme.
Temperature in Boulder in May
Boulder has perfect weather in May, with days reaching 21°C (70°F) and nights cooling to 6°C (43°F). Conditions are often most pleasant around the middle of the day. Nights fall to 6°C (43°F), which is cold enough to feel it indoors too. A good thick duvet makes all the difference for a comfortable night's sleep.
Sunshine in Boulder in May
The city usually sees around 290 hours of sunlight, indicating many sunny days — a great month for sightseeing.If your ideal day consists of dry skies and pleasant temperatures, May, June and September typically offer the best circumstances for Boulder.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United States of America, check out our Boulder's climate page.
Boulder Temperature in May
Min Temperature
6°C (43°F)
Max Temperature
21°C (70°F)
Chance of Rain
41%
Precipitation
80 mm (3.1 in)
Rainy days
12 days
Humidity
51% *
Sunshine
290 hours *
Percentage Sunshine
65% *
Best Places in the United States of America in May
Find out more about the weather in the United States of America and which places have the best travel conditions in this month. See all of the United States of America in May →
perfect weather
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unpleasant
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What to Wear in Boulder in May
For Boulder in May, you'll want flexible clothing. It's wise to pack cotton shirts, comfortable shorts, and a pair of jeans for cooler evenings. A light sweater or jacket is useful for air-conditioned spaces (like buses) or unexpected cool moments. Rain is likely on several days, so bring a good rain jacket. Don't forget sun protection, sunglasses, sunscreen, and a hat. These are all good ideas with this much sunshine.What To Do in Boulder in May
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United States of America, check out our Boulder's climate page.
Temperature Rainfall Sunshine Humidity
See the full Boulder climate overview or explore weather in the United States of America.
