Lake Saint Clair, Missouri Weather
Fireflies pulse through the magnolias. Day 77 of spring. Read this microseason across nine climate regions →
Lake Saint Clair weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 4Overcast——85°57°—
- FridayJun 5Overcast——88°67°+3°
- SaturdayJun 6Overcast12%—91°68°+3°
- SundayJun 7Light Showers61%0.08″78°69°-13°
- MondayJun 8Light Showers66%—93°68°+15°
- TuesdayJun 9Overcast28%—99°72°+6°
- WednesdayJun 10Partly Cloudy16%—97°74°-2°
Ozone at AQI 68 now. AQI up 5 over the last 6 hours (gradual rise). With UV 4.1 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 38 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 68 now. With UV 4.1 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 38 by mid-afternoon.
- Present
- AQI 68
- UV peak
- 4.1 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 38
PM × Wind × Precip
PM2.5 at 10.7 µg/m³, PM10 at 13.1 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.82
- Wind
- breezy
- 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
- 4:28 AM
- Moonset
- 2:11 PM
- In sign
- ♒︎ Aquarius
Fireflies pulse through the magnolias
Lake Saint Clair at a glance
- Today vs. normal: 4°F above the seasonal normal for this latitude
- Last frost: April 6 (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 — Lake Saint Clair
SPC has placed Lake Saint Clair in the General Thunderstorms category for severe thunderstorms tomorrow.
- TODAYNONENo severe risk
- 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.