Niwot, Colorado Weather
Monsoon storms drench the south. Day 15 of summer. Read this microseason across nine climate regions →
Niwot weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 5Partly Cloudy——94°59°—
- MondayJul 6Overcast——98°64°+4°
- TuesdayJul 7Overcast49%—100°62°+2°
- WednesdayJul 8Overcast68%—97°58°-3°
- ThursdayJul 9Drizzle52%0.03″98°58°+1°
- FridayJul 10Partly Cloudy21%—96°60°-2°
- SaturdayJul 11Mostly Clear——100°60°+4°
AQI 36 (Good), driven by PM2.5. AQI down 46 over the last 6 hours — air quality is improving sharply. PM2.5 at 8.2 µg/m³ (AQI 46) with a 0.93 fine-to-coarse ratio and 3 mph wind — combustion smoke trapped in calm air, not road dust.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion.
What's driving it
PM × Wind × Precip
PM2.5 at 8.2 µg/m³ (AQI 46) with a 0.93 fine-to-coarse ratio and 3 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.93
- Wind
- calm
- Recent rain
- 0h in last 6h
- Pattern
- stagnant smoke
Trends
Seven days of AQI and PM2.5.
Hourly air-quality data from the Copernicus Atmosphere Monitoring Service, charted across the past and next several days. Dashed lines mark the AQI breakpoints at 50 (Good → Moderate) and 100 (Moderate → Unhealthy for Sensitive Groups).
If the first of July be rainy weather, 'twill rain more or less for four weeks together.
- Moonrise
- 11:19 PM
- Moonset
- 11:15 AM
- In sign
- ♓︎ Pisces
Monsoon storms drench the south
Niwot at a glance
- Today vs. normal: 12°F below the seasonal normal for this latitude
- Last frost: April 17 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
ZIP code: 80544
15-Day Forecast — Niwot
- Sun94°59°2%
- Mon98°64°2%
- Tue100°62°49%
- Wed97°58°68%
- Thu98°58°52%
- Fri96°60°21%
- Sat100°60°3%
- Sun102°63°2%
- Mon109°62°7%
- Tue100°67°13%
- Wed102°66°24%
- Thu106°63°44%
- Fri102°62°45%
- Sat105°63°44%
- Sun96°66°55%
Forecast data from Open-Meteo (CC BY 4.0).
Right now in the garden
Peak growing season
As of July 5, the growing season is at its peak — frost is months away. Continue succession-planting beans and summer squash. Start fall brassicas (broccoli, cabbage, kale) from seed indoors for transplanting in late summer.
SPC Convective Outlook
Storm Prediction Center — Niwot
SPC includes Niwot in the general thunderstorm area today — no severe risk, but storms are possible.
- TODAYTSTMGeneral Thunderstorms
- TOMORROWTSTMGeneral Thunderstorms
- DAY 3TSTMGeneral Thunderstorms
Thunderstorms possible. Not severe, but capable of producing lightning and brief heavy rain.
Source: NOAA / NWS Storm Prediction Center categorical convective outlook. Outlooks are re-issued multiple times per day; this page reflects the most recent SPC polygons covering the city’s coordinates.
ZIP codes in Niwot
- 80544
- 80503