Arthur, Illinois Weather
Cicadas claim the scorching afternoon. Day 14 of summer. Read this microseason across nine climate regions →
Arthur weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Drizzle38%0.03″91°70°—
- SundayJul 5Overcast19%—83°70°-8°
- MondayJul 6Light Drizzle12%—83°67°0°
- TuesdayJul 7Overcast——81°62°-2°
- WednesdayJul 8Mostly Clear13%—83°62°+2°
- ThursdayJul 9Light Drizzle32%—86°71°+3°
- FridayJul 10Light Drizzle33%—79°68°-7°
AQI 30 (Good), driven by Ozone. AQI down 5 over the last 6 hours (gradual decline). Ozone at AQI 36 now. With UV 5.2 peaking around 1 PM under clear 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 during the projected peak around 9 PM.
What's driving it
Ozone × UV × Sky
Ozone at AQI 36 now. With UV 5.2 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 25 around 1 PM.
- Present
- AQI 36
- UV peak
- 5.2 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 25
PM × Wind × Precip
PM2.5 at 5.8 µg/m³ (AQI 32) with a 0.91 fine-to-coarse ratio and 5 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.91
- 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
- 10:48 PM
- Moonset
- 10:00 AM
- In sign
- ♓︎ Pisces
Cicadas claim the scorching afternoon
Arthur at a glance
- Today vs. normal: 9°F above the seasonal normal for this latitude
- Last frost: April 14 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
ZIP code: 61911
16-Day Forecast — Arthur
- Sat90°70°38%
- Sun83°70°19%
- Mon83°67°12%
- Tue81°62°5%
- Wed83°62°13%
- Thu86°71°32%
- Fri79°68°33%
- Sat83°67°29%
- Sun73°58°11%
- Mon70°57°7%
- Tue77°60°8%
- Wed80°63°13%
- Thu82°65°19%
- Fri83°69°29%
- Sat85°70°29%
- Sun81°72°26%
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 — Arthur
SPC has placed Arthur 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 Arthur
- 61911