Ballwin, Missouri Weather
Cicadas claim the scorching afternoon. Day 14 of summer. Read this microseason across nine climate regions →
Ballwin weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Overcast27%—92°76°—
- SundayJul 5Overcast25%—81°71°-11°
- MondayJul 6Clear23%—85°69°+4°
- TuesdayJul 7Clear——88°67°+3°
- WednesdayJul 8Mostly Clear——95°68°+7°
- ThursdayJul 9Overcast31%—96°76°+1°
- FridayJul 10Overcast43%—96°78°0°
AQI 46 (Good), driven by PM2.5. AQI flat over the last 6 hours (within ±3 points). PM2.5 at 12.9 µg/m³, PM10 at 13.9 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 55 now. With UV 6.0 peaking around 1 PM under partly cloudy skies, surface ozone likely climbs to AQI 31 around 1 PM.
- Present
- AQI 55
- UV peak
- 6.0 at 1 PM
- Sky at peak
- partly cloudy
- Projected peak
- AQI 31
PM × Wind × Precip
PM2.5 at 12.9 µg/m³, PM10 at 13.9 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.93
- 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
- 10:55 PM
- Moonset
- 10:10 AM
- In sign
- ♓︎ Pisces
Cicadas claim the scorching afternoon
Ballwin at a glance
- Today vs. normal: 19°F above the seasonal normal for this latitude
- Last frost: April 8 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
ZIP codes: 63011, 63021
16-Day Forecast — Ballwin
- Sat92°76°27%
- Sun81°71°25%
- Mon85°69°23%
- Tue88°67°5%
- Wed95°68°9%
- Thu96°76°31%
- Fri96°78°43%
- Sat82°68°22%
- Sun80°63°7%
- Mon83°62°7%
- Tue83°63°10%
- Wed90°63°10%
- Thu93°68°10%
- Fri95°72°9%
- Sat81°67°14%
- Sun76°68°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 — Ballwin
SPC has placed Ballwin 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 Ballwin
- 63021
- 63011
- 63022
- 63024