Granby, CO Weather & Growing Conditions
Overnight
39°F
Chance Rain Showers
A chance of rain showers. Mostly cloudy, with a low around 39. West southwest wind around 2 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 |
|---|---|---|---|---|
| Overnight | 39°F | Chance Rain Showers | 2 mph WSW | 25% |
| Saturday | 66°F | Chance Rain Showers then Chance Showers And Thunderstorms | 1 to 12 mph SW | 44% |
| Saturday Night | 34°F | Chance Showers And Thunderstorms | 0 to 9 mph WNW | 30% |
| Sunday | 62°F | Chance Rain Showers then Slight Chance Showers And Thunderstorms | 0 to 16 mph WSW | 32% |
| Sunday Night | 31°F | Mostly Clear | 0 to 12 mph NNW | 0% |
| Monday | 67°F | Sunny | 0 to 12 mph WSW | 0% |
| Monday Night | 34°F | Mostly Clear | 1 to 7 mph ENE | 1% |
| Tuesday | 69°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 0 to 10 mph SSW | 17% |
| Tuesday Night | 36°F | Slight Chance Rain Showers then Partly Cloudy | 0 to 6 mph SE | 21% |
| Wednesday | 67°F | Partly Sunny then Slight Chance Showers And Thunderstorms | 0 to 12 mph W | 24% |
| Wednesday Night | 35°F | Partly Cloudy | 0 to 7 mph WNW | 7% |
| Thursday | 70°F | Mostly Sunny | 0 to 8 mph W | 10% |
| Thursday Night | 37°F | Partly Cloudy | 0 to 7 mph ENE | 10% |
| Friday | 70°F | Mostly Sunny then Chance Showers And Thunderstorms | 0 to 8 mph WNW | 26% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Granby, CO
Last spring frost
Jun 13
First fall frost
Sep 7
Growing season
84 days
Hardiness zone
5a
Explore more for Granby, CO: full frost dates · planting calendar · Colorado frost dates
Climate data from the nearest NOAA station, Grand Lake 6 Ssw, Co (3.9 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.