St. Charles, Arkansas Weather
Sun climbs to its northern throne. Day 88 of spring. Read this microseason across nine climate regions →
St. Charles weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 15Overcast——87°69°—
- TuesdayJun 16Overcast13%—86°71°-1°
- WednesdayJun 17Thunderstorm——89°72°+3°
- ThursdayJun 18Thunderstorm51%0.08″86°72°-3°
- FridayJun 19Light Drizzle63%—84°69°-2°
- SaturdayJun 20Overcast15%—88°65°+4°
- SundayJun 21Overcast31%—93°74°+5°
AQI 22 (Good), driven by PM2.5. AQI down 10 over the last 6 hours (gradual decline). PM2.5 at 6.5 µg/m³ (AQI 36) with a 0.97 fine-to-coarse ratio and 5 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 during the projected peak around 5 PM.
What's driving it
PM × Wind × Precip
PM2.5 at 6.5 µg/m³ (AQI 36) with a 0.97 fine-to-coarse ratio and 5 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.97
- 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).
A summer fog for fair, a winter fog for rain.
- Moonrise
- 5:59 AM
- Moonset
- 8:29 PM
- In sign
- ♊︎ Gemini
Sun climbs to its northern throne
St. Charles at a glance
- Today vs. normal: 12°F below the seasonal normal for this latitude
- Last frost: March 13 (climatological average for this latitude)
- Microseason: Jun 11–15
- Planting window: Stake and prune tomato suckers. Watch for squash vine borers.
15-Day Forecast — St. Charles
- Mon87°69°7%
- Tue86°71°13%
- Wed89°72°4%
- Thu86°72°51%
- Fri84°69°63%
- Sat88°65°15%
- Sun93°74°31%
- Mon89°76°40%
- Tue88°73°42%
- Wed81°73°24%
- Thu93°73°21%
- Fri96°77°42%
- Sat96°75°26%
- Sun93°73°31%
- Mon94°72°39%
Forecast data from Open-Meteo (CC BY 4.0).
Right now in the garden
Peak growing season
As of June 15, 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. Charles
SPC has placed St. Charles in the General Thunderstorms category for severe thunderstorms today.
- TODAYTSTMGeneral Thunderstorms
- TOMORROWNONENo severe risk
- DAY 3NONENo severe risk
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 St. Charles
- 72140