San Luis, Colorado Weather
Heat hardens the dust. Day 77 of spring. Read this microseason across nine climate regions →
San Luis weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 4Overcast——78°49°—
- FridayJun 5Overcast——80°56°+2°
- SaturdayJun 6Drizzle30%0.03″76°49°-4°
- SundayJun 7Overcast24%—80°48°+4°
- MondayJun 8Overcast——81°50°+1°
- TuesdayJun 9Light Drizzle10%0.01″85°56°+4°
- WednesdayJun 10Light Drizzle12%0.05″79°52°-6°
Ozone at AQI 34 now. AQI flat over the last 6 hours (within ±3 points). With UV 3.3 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 15 by mid-afternoon.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion during the projected peak around 7 AM.
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 by mid-afternoon.
- Present
- AQI 34
- UV peak
- 3.3 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 15
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
- 5:23 AM
- Moonset
- 3:14 PM
- In sign
- ♑︎ Capricorn
Heat hardens the dust
San Luis at a glance
- Today vs. normal: 25°F below the seasonal normal for this latitude
- Last frost: March 30 (climatological average for this latitude)
- Microseason: Jun 1–5
- Planting window: Harvest spring lettuce before it bolts. Sow heat-tolerant greens.
Right now in the garden
Peak growing season
As of June 4, 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 — San Luis
SPC has placed San Luis in the General Thunderstorms category for severe thunderstorms today.
- 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.