St. Mary, Missouri Weather
Fireflies pulse through the magnolias. Day 76 of spring. Read this microseason across nine climate regions →
St. Mary weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 3Partly Cloudy——81°54°—
- ThursdayJun 4Overcast——84°60°+3°
- FridayJun 5Drizzle——84°63°0°
- SaturdayJun 6Heavy Drizzle14%—88°65°+4°
- SundayJun 7Heavy Drizzle39%—88°70°0°
- MondayJun 8Showers58%0.43″81°71°-7°
- TuesdayJun 9Drizzle36%0.02″82°70°+1°
Ozone at AQI 80 now. AQI up 11 over the last 6 hours (gradual rise). With UV 8.5 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 91 by mid-afternoon.
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 80 now. With UV 8.5 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 91 by mid-afternoon.
- Present
- AQI 80
- UV peak
- 8.5 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 91
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).
The higher the clouds, the finer the weather.
- Moonrise
- 3:44 AM
- Moonset
- 1:06 PM
- In sign
- ♑︎ Capricorn
Fireflies pulse through the magnolias
St. Mary at a glance
- Today vs. normal: 79°F — typical for the season
- Last frost: April 3 (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 3, 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
SPC has placed St. Mary in the General Thunderstorms category for severe thunderstorms day after tomorrow.
- TODAYNONENo severe risk
- TOMORROWNONENo severe risk
- 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.