Williamstown, Missouri Weather
Cicadas claim the scorching afternoon. Day 14 of summer. Read this microseason across nine climate regions →
Williamstown weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Overcast17%—88°70°—
- SundayJul 5Light Drizzle14%0.01″86°71°-2°
- MondayJul 6Overcast——81°66°-5°
- TuesdayJul 7Clear——83°63°+2°
- WednesdayJul 8Overcast——88°64°+5°
- ThursdayJul 9Thunderstorm34%0.01″83°70°-5°
- FridayJul 10Light Showers35%0.11″84°68°+1°
AQI 31 (Good), driven by Ozone. Ozone at AQI 48 now. With UV 5.5 peaking around 1 PM under partly cloudy skies, surface ozone likely climbs to AQI 25 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 48 now. With UV 5.5 peaking around 1 PM under partly cloudy skies, surface ozone likely climbs to AQI 25 around 1 PM.
- Present
- AQI 48
- UV peak
- 5.5 at 1 PM
- Sky at peak
- partly cloudy
- Projected peak
- AQI 25
PM × Wind × Precip
PM2.5 at 7.4 µg/m³, PM10 at 7.9 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.94
- 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).
If the first of July be rainy weather, 'twill rain more or less for four weeks together.
- Moonrise
- 11:02 PM
- Moonset
- 10:13 AM
- In sign
- ♓︎ Pisces
Cicadas claim the scorching afternoon
Williamstown at a glance
- Today vs. normal: 14°F above the seasonal normal for this latitude
- Last frost: April 17 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
ZIP code: 63473
16-Day Forecast — Williamstown
- Sat88°70°17%
- Sun86°71°14%
- Mon81°66°3%
- Tue83°63°1%
- Wed88°64°8%
- Thu83°70°34%
- Fri84°68°35%
- Sat71°63°19%
- Sun76°59°7%
- Mon77°59°4%
- Tue78°58°11%
- Wed82°57°13%
- Thu84°64°16%
- Fri81°69°16%
- Sat83°65°14%
- Sun76°61°10%
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 — Williamstown
SPC includes Williamstown in the general thunderstorm area today — no severe risk, but storms are possible.
- TODAYTSTMGeneral Thunderstorms
- 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.
ZIP codes in Williamstown
- 63473