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
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| 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.