Littleton, Colorado Weather
Paintbrush crowns the ridges. Day 88 of spring. Read this microseason across nine climate regions →
Littleton weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 15Overcast——81°49°—
- TuesdayJun 16Overcast——91°52°+10°
- WednesdayJun 17Overcast——97°61°+6°
- ThursdayJun 18Clear——86°53°-11°
- FridayJun 19Overcast——95°55°+9°
- SaturdayJun 20Overcast47%—96°63°+1°
- SundayJun 21Light Drizzle51%—91°57°-5°
AQI 51 (Moderate), driven by PM2.5. AQI up 7 over the last 6 hours (gradual rise). PM2.5 at 23.2 µg/m³ (AQI 77) with a 0.89 fine-to-coarse ratio and 4 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
Ozone × UV × Sky
Ozone at AQI 34 now. With UV 3.3 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 15 around 1 PM.
- Present
- AQI 34
- UV peak
- 3.3 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 15
PM × Wind × Precip
PM2.5 at 23.2 µg/m³ (AQI 77) with a 0.89 fine-to-coarse ratio and 4 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.89
- 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).
A summer fog for fair, a winter fog for rain.
- Moonrise
- 5:38 AM
- Moonset
- 8:48 PM
- In sign
- ♊︎ Gemini
Paintbrush crowns the ridges
Littleton at a glance
- Today vs. normal: 23°F below the seasonal normal for this latitude
- Last frost: April 14 (climatological average for this latitude)
- Microseason: Jun 11–15
- Planting window: Stake and prune tomato suckers. Watch for squash vine borers.
15-Day Forecast — Littleton
- Mon81°49°4%
- Tue91°52°3%
- Wed97°61°1%
- Thu86°53°1%
- Fri95°55°6%
- Sat96°63°47%
- Sun91°57°51%
- Mon90°55°48%
- Tue92°57°26%
- Wed100°61°16%
- Thu102°66°14%
- Fri96°65°27%
- Sat96°63°39%
- Sun82°65°46%
- Mon85°60°48%
Forecast data from Open-Meteo (CC BY 4.0).
Right now in the garden
Warm-season window is open
As of June 15, the last spring frost has passed for most years. Transplant tomatoes, peppers, eggplants, basil, and cucurbits (cucumbers, squash, melons) now. Direct-sow beans and corn into warm soil.
ZIP codes in Littleton
- 80128
- 80122
- 80123
- 80120
- 80160
- 80165
- 80166