St. Mary's, Colorado Weather
Monsoon storms drench the south. Day 15 of summer. Read this microseason across nine climate regions →
St. Mary's weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 5Overcast——73°48°—
- MondayJul 6Overcast12%—74°54°+1°
- TuesdayJul 7Drizzle84%0.02″76°50°+2°
- WednesdayJul 8Drizzle64%—76°46°0°
- ThursdayJul 9Light Drizzle51%—75°46°-1°
- FridayJul 10Overcast26%—75°48°0°
- SaturdayJul 11Partly Cloudy——79°50°+4°
AQI 40 (Good), driven by PM2.5. AQI down 39 over the last 6 hours — air quality is improving sharply. PM2.5 at 5.9 µg/m³, PM10 at 6.9 µg/m³ — typical background levels with no transport signature.
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 33. Overcast through the UV peak window (cloud cover ~90%) — afternoon ozone should stay flat.
- Present
- AQI 33
- UV peak
- 3.3 at 1 PM
- Sky at peak
- overcast
- Projected peak
- AQI 7
PM × Wind × Precip
PM2.5 at 5.9 µg/m³, PM10 at 6.9 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.86
- Wind
- light
- Recent rain
- 0h in last 6h
- Pattern
- background
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
- 11:21 PM
- Moonset
- 11:17 AM
- In sign
- ♓︎ Pisces
Monsoon storms drench the south
St. Mary's at a glance
- Today vs. normal: 21°F below the seasonal normal for this latitude
- Last frost: April 15 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
15-Day Forecast — St. Mary's
- Sun73°48°4%
- Mon74°54°12%
- Tue76°50°84%
- Wed76°46°64%
- Thu75°46°51%
- Fri75°48°26%
- Sat79°50°5%
- Sun81°48°9%
- Mon83°55°16%
- Tue83°53°37%
- Wed84°51°48%
- Thu78°53°55%
- Fri78°52°52%
- Sat79°52°59%
- Sun72°51°72%
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 — St. Mary's
SPC includes St. Mary's 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 St. Mary's
- 80452