Niwot, CO Weather & Growing Conditions
Today
59°F
Sunny
Sunny. High near 59, with temperatures falling to around 54 in the afternoon. South southeast wind around 5 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 59°F | Sunny | 5 mph SSE | 0% |
| Tonight | 36°F | Mostly Cloudy | 3 mph WSW | 0% |
| Friday | 58°F | Partly Sunny | 0 to 3 mph NE | 9% |
| Friday Night | 34°F | Mostly Clear | 3 mph WSW | 4% |
| Saturday | 60°F | Sunny | 3 mph SE | 0% |
| Saturday Night | 34°F | Mostly Clear | 2 mph WSW | 0% |
| Sunday | 65°F | Sunny | 2 mph S | 0% |
| Sunday Night | 38°F | Clear | 3 to 7 mph W | 0% |
| Monday | 67°F | Sunny | 3 mph E | 0% |
| Monday Night | 38°F | Mostly Clear | 1 mph NW | 0% |
| Tuesday | 65°F | Mostly Sunny | 2 mph E | 1% |
| Tuesday Night | 37°F | Partly Cloudy | 2 mph W | 1% |
| Veterans Day | 64°F | Sunny | 2 mph E | 1% |
| Wednesday Night | 37°F | Partly Cloudy | 3 mph WNW | 1% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Niwot, CO
Last spring frost
May 7
First fall frost
Oct 5
Growing season
151 days
Explore more for Niwot, CO: full frost dates · planting calendar · Colorado frost dates
Climate data from the nearest NOAA station, Longmont 2 Ese, Co (6.8 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 5, 2026.