St. Thomas, Missouri Weather
Heat settles and the rain begins. Day 90 of spring. Read this microseason across nine climate regions →
St. Thomas weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 16Overcast17%—80°59°—
- WednesdayJun 17Thunderstorm40%0.09″91°66°+11°
- ThursdayJun 18Light Drizzle34%—74°62°-17°
- FridayJun 19Overcast12%—79°59°+5°
- SaturdayJun 20Light Drizzle36%—84°60°+5°
- SundayJun 21Heavy Showers69%0.72″77°66°-7°
- MondayJun 22Light Drizzle64%—75°63°-2°
AQI 44 (Good), driven by Ozone. AQI up 10 over the last 6 hours (gradual rise). Ozone at AQI 43 now. With UV 0.2 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 10 around 1 PM.
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 43 now. With UV 0.2 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 10 around 1 PM.
- Present
- AQI 43
- UV peak
- 0.2 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 10
PM × Wind × Precip
PM2.5 at 6.2 µg/m³, PM10 at 7.6 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.82
- 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).
A summer fog for fair, a winter fog for rain.
- Moonrise
- 8:15 AM
- Moonset
- 10:41 PM
- In sign
- ♋︎ Cancer
Heat settles and the rain begins
St. Thomas at a glance
- Today vs. normal: 4°F below the seasonal normal for this latitude
- Last frost: April 6 (climatological average for this latitude)
- Microseason: Jun 16–20
- Planting window: Stake and prune tomato suckers. Watch for squash vine borers.
16-Day Forecast — St. Thomas
- Tue80°59°17%
- Wed91°66°40%
- Thu74°62°34%
- Fri79°59°12%
- Sat84°60°36%
- Sun77°66°69%
- Mon75°63°64%
- Tue73°64°23%
- Wed77°61°20%
- Thu85°61°20%
- Fri91°71°21%
- Sat91°74°39%
- Sun91°71°27%
- Mon90°70°33%
- Tue92°71°35%
- Wed85°72°32%
Forecast data from Open-Meteo (CC BY 4.0).
Right now in the garden
Peak growing season
As of June 17, 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. Thomas
SPC has placed St. Thomas in the Enhanced Risk category for severe thunderstorms tomorrow.
- TODAYTSTMGeneral Thunderstorms
- TOMORROWENHEnhanced Risk
- DAY 3TSTMGeneral Thunderstorms
Numerous severe storms likely. Tornadoes, large hail, and damaging wind gusts possible across the area. Track NWS warnings if storms develop.
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. Thomas
- 65076