Arnold, Missouri Weather
Cicadas claim the scorching afternoon. Day 14 of summer. Read this microseason across nine climate regions →
Arnold weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Heavy Drizzle39%0.05″95°76°—
- SundayJul 5Rain27%0.23″84°72°-11°
- MondayJul 6Overcast27%—88°69°+4°
- TuesdayJul 7Overcast——86°69°-2°
- WednesdayJul 8Overcast11%—93°67°+7°
- ThursdayJul 9Thunderstorm29%—98°72°+5°
- FridayJul 10Thunderstorm41%0.02″92°73°-6°
AQI 46 (Good), driven by PM2.5. AQI flat over the last 6 hours (within ±3 points). PM2.5 at 10.1 µg/m³ (AQI 53) with a 0.94 fine-to-coarse ratio and 6 mph wind — combustion smoke trapped in calm air, not road dust.
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 36 now. With UV 4.9 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 24 around 1 PM.
- Present
- AQI 36
- UV peak
- 4.9 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 24
PM × Wind × Precip
PM2.5 at 10.1 µg/m³ (AQI 53) with a 0.94 fine-to-coarse ratio and 6 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.94
- Wind
- light
- Recent rain
- 0h in last 6h
- Pattern
- stagnant smoke
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
- 10:54 PM
- Moonset
- 10:09 AM
- In sign
- ♓︎ Pisces
Cicadas claim the scorching afternoon
Arnold at a glance
- Today vs. normal: 16°F above the seasonal normal for this latitude
- Last frost: April 7 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
ZIP code: 63010
16-Day Forecast — Arnold
- Sat96°76°39%
- Sun84°72°27%
- Mon88°69°27%
- Tue86°69°6%
- Wed93°67°11%
- Thu98°72°29%
- Fri92°73°41%
- Sat88°74°21%
- Sun80°66°7%
- Mon80°60°6%
- Tue81°62°10%
- Wed84°64°10%
- Thu83°65°10%
- Fri81°68°9%
- Sat87°70°14%
- Sun92°72°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 — Arnold
SPC has placed Arnold 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 Arnold
- 63010