Boulder, Colorado Weather
Monsoon storms drench the south. Day 15 of summer. Read this microseason across nine climate regions →
Boulder weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 5Partly Cloudy——95°59°—
- MondayJul 6Overcast——99°66°+4°
- TuesdayJul 7Light Drizzle61%—98°67°-1°
- WednesdayJul 8Drizzle62%0.05″96°62°-2°
- ThursdayJul 9Light Drizzle43%0.02″96°64°0°
- FridayJul 10Partly Cloudy23%—94°65°-2°
- SaturdayJul 11Mostly Clear——98°66°+4°
AQI 40 (Good), driven by PM2.5. AQI down 54 over the last 6 hours — air quality is improving sharply. PM2.5 at 8.5 µg/m³ (AQI 47) 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 8.5 µg/m³ (AQI 47) 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
- 11:20 PM
- Moonset
- 11:16 AM
- In sign
- ♓︎ Pisces
Monsoon storms drench the south
Boulder at a glance
- Today vs. normal: 7°F below the seasonal normal for this latitude
- Last frost: April 16 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
ZIP codes: 80301, 80302, 80303, 80304, 80305, 80310
15-Day Forecast — Boulder
- Sun95°59°3%
- Mon99°66°7%
- Tue98°67°61%
- Wed96°62°62%
- Thu96°64°43%
- Fri94°65°23%
- Sat98°66°4%
- Sun101°67°3%
- Mon107°70°9%
- Tue100°73°25%
- Wed101°71°27%
- Thu104°65°44%
- Fri101°68°45%
- Sat103°67°44%
- Sun94°69°55%
Forecast data from Open-Meteo (CC BY 4.0).
Live wind & temperature near Boulder
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 — Boulder
SPC includes Boulder 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 Boulder
- 80310
- 80304
- 80305
- 80302
- 80303
- 80301
- 80307
- 80309
- 80314