Keystone, Colorado Weather
Monsoon storms drench the south. Day 15 of summer. Read this microseason across nine climate regions →
Keystone weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 5Overcast——70°46°—
- MondayJul 6Overcast——73°51°+3°
- TuesdayJul 7Light Snow Shwrs74%0.06″75°43°+2°
- WednesdayJul 8Light Drizzle45%—77°44°+2°
- ThursdayJul 9Light Drizzle38%—73°42°-4°
- FridayJul 10Overcast17%—76°41°+3°
- SaturdayJul 11Mostly Clear——77°43°+1°
AQI 46 (Good), driven by Ozone. AQI down 35 over the last 6 hours — air quality is improving sharply. Ozone at AQI 41 now. With UV 3.3 peaking around 1 PM under partly cloudy skies, surface ozone likely climbs to AQI 13 around 1 PM.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion.
What's driving it
Ozone × UV × Sky
Ozone at AQI 41 now. With UV 3.3 peaking around 1 PM under partly cloudy skies, surface ozone likely climbs to AQI 13 around 1 PM.
- Present
- AQI 41
- UV peak
- 3.3 at 1 PM
- Sky at peak
- partly cloudy
- Projected peak
- AQI 13
PM × Wind × Precip
PM2.5 at 6.7 µg/m³ (AQI 37) with a 0.83 fine-to-coarse ratio and 6 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.83
- Wind
- light
- 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
- 11:22 PM
- Moonset
- 11:19 AM
- In sign
- ♓︎ Pisces
Monsoon storms drench the south
Keystone at a glance
- Today vs. normal: 24°F below the seasonal normal for this latitude
- Last frost: April 14 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
15-Day Forecast — Keystone
- Sun70°46°9%
- Mon73°51°9%
- Tue75°43°74%
- Wed77°44°45%
- Thu73°42°38%
- Fri76°41°17%
- Sat77°43°9%
- Sun80°43°11%
- Mon82°45°19%
- Tue86°49°33%
- Wed81°47°46%
- Thu79°48°63%
- Fri79°45°61%
- Sat83°46°59%
- Sun69°46°73%
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 — Keystone
SPC includes Keystone 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 Keystone
- 80435