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 70 in the afternoon. Southwest wind around 6 mph. Chance of precipitation is 50%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 80°F | Chance Showers And Thunderstorms | 6 mph SW | 50% |
| Tonight | 56°F | Chance Showers And Thunderstorms then Partly Cloudy | 2 to 6 mph WSW | 28% |
| Saturday | 75°F | Slight Chance Rain Showers then Chance Showers And Thunderstorms | 1 to 6 mph WNW | 67% |
| Saturday Night | 51°F | Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms | 2 mph W | 46% |
| Sunday | 71°F | Chance Showers And Thunderstorms | 0 to 3 mph NNE | 44% |
| Sunday Night | 51°F | Chance Rain Showers then Partly Cloudy | 2 mph NNW | 33% |
| Monday | 72°F | Sunny | 0 to 5 mph NE | 4% |
| Monday Night | 52°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 | 54°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 2 mph NNW | 21% |
| Wednesday | 77°F | Partly Sunny then Chance Showers And Thunderstorms | 0 to 3 mph NE | 29% |
| Wednesday Night | 54°F | Slight Chance Rain Showers then Mostly Cloudy | 1 mph SSW | 20% |
| Thursday | 77°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 1 to 5 mph NE | 20% |
| Thursday Night | 55°F | Chance Rain Showers then Mostly Cloudy | 2 mph SW | 28% |
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 (0.9 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.