St. Mary, Missouri Weather
Cicadas claim the scorching afternoon. Day 14 of summer. Read this microseason across nine climate regions →
St. Mary weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Drizzle42%0.03″96°74°—
- SundayJul 5Rain36%0.46″86°72°-10°
- MondayJul 6Thunderstorm31%—89°70°+3°
- TuesdayJul 7Overcast11%—88°68°-1°
- WednesdayJul 8Overcast13%—93°67°+5°
- ThursdayJul 9Overcast22%—98°73°+5°
- FridayJul 10Heavy Drizzle37%0.08″89°73°-9°
AQI 35 (Good), driven by PM2.5. AQI down 6 over the last 6 hours (gradual decline). PM2.5 at 8.3 µg/m³, PM10 at 9.1 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 34 now. With UV 6.1 peaking around 1 PM under partly cloudy skies, surface ozone likely climbs to AQI 20 around 1 PM.
- Present
- AQI 34
- UV peak
- 6.1 at 1 PM
- Sky at peak
- partly cloudy
- Projected peak
- AQI 20
PM × Wind × Precip
PM2.5 at 8.3 µg/m³, PM10 at 9.1 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.91
- 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
- 10:51 PM
- Moonset
- 10:08 AM
- In sign
- ♓︎ Pisces
Cicadas claim the scorching afternoon
St. Mary at a glance
- Today vs. normal: 17°F above the seasonal normal for this latitude
- Last frost: April 3 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
16-Day Forecast — St. Mary
- Sat96°74°42%
- Sun86°72°36%
- Mon89°70°31%
- Tue88°68°11%
- Wed93°67°13%
- Thu98°73°22%
- Fri89°73°37%
- Sat95°71°22%
- Sun81°65°10%
- Mon79°59°6%
- Tue80°60°9%
- Wed83°64°9%
- Thu79°65°10%
- Fri80°68°14%
- Sat88°70°16%
- Sun93°74°16%
Forecast data from Open-Meteo (CC BY 4.0).
Right now in the garden
Peak growing season
As of July 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 — St. Mary
SPC has placed St. Mary in the Slight Risk category for severe thunderstorms today.
- TODAYSLGTSlight Risk
- TOMORROWTSTMGeneral Thunderstorms
- DAY 3TSTMGeneral Thunderstorms
Scattered severe storms possible. A few tornadoes, hail, and damaging wind gusts possible.
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
- 63673