Current Weather and Forecast in Boulder, CO
Colorado, United States 🇺🇸
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About the weather in Boulder
Boulder has a humid subtropical climate. July is the warmest month, with average highs of 85°, and January the coldest, when nights fall to around 17°. May brings the most rain, on about 15 days, while July is the sunniest, with 13.1 hours of sunshine a day. Over a whole year it rains on roughly 94 days.
Boulder climate guide: monthly averages, seasons and the best time to visit
Common questions
Does it snow in Boulder?
Yes - about 34 days a year carry measurable snowfall, concentrated October through May.
What is the rainiest month in Boulder?
May, at 4.6 inches (116 mm) over about 15 days. December is the driest month, at 22 mm (0.9 in).
What is the coldest month in Boulder?
January, with highs of 38°F (3°C) and lows near 17°F (-8°C). The coldest day in the 2015-2024 record fell to -24°F (-31°C).
Does it rain a lot in Boulder?
20.6 inches (524 mm) a year across 94 wet days - less than 82% of the cities we cover.
What is the best time to visit Boulder?
The best time to visit Boulder is generally August to October and June, when these are the warmest and brightest weeks of the year. Daytime temperatures in that window sit near 76°F (24°C), with rain on about 7 days a month. For the same question asked the other way round, see where else is warm in August.
Which month is warmest in Boulder?
July, averaging 85°F (30°C) by day and 59°F (15°C) overnight. The hottest single day in our 2015-2024 record for this location reached 98°F (37°C).