Boulder, CO Weather & Growing Conditions
This Afternoon
76°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms. Mostly cloudy. High near 76, with temperatures falling to around 68 in the afternoon. North northeast wind around 5 mph. Chance of precipitation is 40%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 76°F | Chance Showers And Thunderstorms | 5 mph NNE | 43% |
| Tonight | 49°F | Chance Showers And Thunderstorms then Partly Cloudy | 0 to 5 mph SSW | 28% |
| Sunday | 69°F | Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms | 1 to 5 mph NNE | 30% |
| Sunday Night | 48°F | Slight Chance Rain Showers then Partly Cloudy | 0 to 5 mph NNE | 22% |
| Monday | 72°F | Sunny | 0 to 6 mph ENE | 2% |
| Monday Night | 50°F | Partly Cloudy | 0 to 5 mph N | 4% |
| Tuesday | 76°F | Mostly Sunny | 0 to 5 mph ENE | 9% |
| Tuesday Night | 52°F | Partly Cloudy | 3 mph NNW | 13% |
| Wednesday | 78°F | Partly Sunny | 1 to 5 mph NNE | 11% |
| Wednesday Night | 52°F | Mostly Cloudy | 3 mph NW | 10% |
| Thursday | 79°F | Mostly Sunny | 1 to 8 mph SSE | 7% |
| Thursday Night | 55°F | Mostly Cloudy | 0 to 6 mph WNW | 12% |
| Friday | 78°F | Mostly Sunny then Chance Showers And Thunderstorms | 0 to 5 mph E | 30% |
| Friday Night | 55°F | Chance Rain Showers | 3 mph SSW | 26% |
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 20, 2026.