Harman US

Boulder, CO Weather & Growing Conditions

Tonight
53°F
Chance Showers And Thunderstorms then Partly Cloudy
A chance of showers and thunderstorms before 8pm, then a slight chance of showers and thunderstorms between 8pm and 9pm. Partly cloudy, with a low around 53. West southwest wind 2 to 6 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.

7-day forecast

WhenTempForecastWindPrecip
Tonight 53°F Chance Showers And Thunderstorms then Partly Cloudy 2 to 6 mph WSW 26%
Saturday 75°F Mostly Sunny then Chance Showers And Thunderstorms 2 to 6 mph NNW 65%
Saturday Night 48°F Chance Showers And Thunderstorms 3 mph W 48%
Sunday 70°F Chance Showers And Thunderstorms 1 to 5 mph NE 49%
Sunday Night 48°F Chance Rain Showers then Partly Cloudy 0 to 5 mph NNW 33%
Monday 72°F Sunny 0 to 5 mph ENE 3%
Monday Night 50°F Mostly Clear 0 to 5 mph N 8%
Tuesday 76°F Mostly Sunny then Slight Chance Showers And Thunderstorms 0 to 5 mph NE 22%
Tuesday Night 52°F Slight Chance Showers And Thunderstorms then Partly Cloudy 0 to 3 mph NW 20%
Wednesday 76°F Partly Sunny then Slight Chance Showers And Thunderstorms 0 to 5 mph NE 22%
Wednesday Night 52°F Slight Chance Rain Showers then Mostly Cloudy 3 mph SW 19%
Thursday 77°F Mostly Sunny then Slight Chance Showers And Thunderstorms 1 to 6 mph NE 17%
Thursday Night 53°F Chance Rain Showers then Mostly Cloudy 0 to 5 mph SW 28%
Friday 78°F Mostly Sunny then Slight Chance Showers And Thunderstorms 0 to 5 mph ENE 20%

Forecast source: National Weather Service (api.weather.gov). Updated through the day.

Growing snapshot for Boulder, CO

Last spring frost
May 6
First fall frost
Oct 5
Growing season
151 days
Hardiness zone
6a

Explore more for Boulder, CO: full frost dates · planting calendar · Colorado frost dates

Climate data from the nearest NOAA station, Boulder, Co (3.3 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.