Boulder, CO Weather & Growing Conditions
This Afternoon
80°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms. Mostly cloudy. High near 80, with temperatures falling to around 71 in the afternoon. Southwest wind around 5 mph. Chance of precipitation is 50%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 80°F | Chance Showers And Thunderstorms | 5 mph SW | 50% |
| Tonight | 55°F | Chance Showers And Thunderstorms then Partly Cloudy | 5 mph W | 28% |
| Saturday | 75°F | Slight Chance Rain Showers then Chance Showers And Thunderstorms | 1 to 5 mph WSW | 67% |
| Saturday Night | 50°F | Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms | 2 mph W | 45% |
| Sunday | 71°F | Chance Showers And Thunderstorms | 0 to 3 mph NE | 43% |
| Sunday Night | 49°F | Chance Rain Showers then Partly Cloudy | 0 to 3 mph NNW | 32% |
| Monday | 72°F | Sunny | 0 to 5 mph NE | 4% |
| Monday Night | 51°F | Mostly Clear | 2 mph N | 7% |
| Tuesday | 76°F | Mostly Sunny then Chance Showers And Thunderstorms | 0 to 3 mph ENE | 28% |
| Tuesday Night | 53°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 2 mph NNW | 20% |
| Wednesday | 77°F | Partly Sunny then Chance Showers And Thunderstorms | 0 to 3 mph NE | 28% |
| Wednesday Night | 53°F | Slight Chance Rain Showers then Mostly Cloudy | 2 mph SSW | 19% |
| Thursday | 77°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 1 to 5 mph NE | 19% |
| Thursday Night | 54°F | Chance Rain Showers then Mostly Cloudy | 0 to 3 mph WSW | 27% |
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 (3.8 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.