St. David, Illinois Weather
Cicadas claim the scorching afternoon. Day 14 of summer. Read this microseason across nine climate regions →
St. David weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Light Drizzle50%—88°68°—
- SundayJul 5Foggy17%—85°69°-3°
- MondayJul 6Overcast——83°66°-2°
- TuesdayJul 7Clear——81°61°-2°
- WednesdayJul 8Light Drizzle——85°64°+4°
- ThursdayJul 9Thunderstorm39%0.06″83°71°-2°
- FridayJul 10Light Drizzle39%—79°66°-4°
AQI 26 (Good), driven by PM2.5. AQI down 8 over the last 6 hours (gradual decline). PM2.5 at 8.9 µg/m³ (AQI 49) with a 0.88 fine-to-coarse ratio and 3 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 10 PM.
What's driving it
Ozone × UV × Sky
Ozone at AQI 35. Overcast through the UV peak window (cloud cover ~77%) — afternoon ozone should stay flat.
- Present
- AQI 35
- UV peak
- 4.2 at 1 PM
- Sky at peak
- overcast
- Projected peak
- AQI 10
PM × Wind × Precip
PM2.5 at 8.9 µg/m³ (AQI 49) with a 0.88 fine-to-coarse ratio and 3 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.88
- Wind
- calm
- 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
- 10:55 PM
- Moonset
- 10:06 AM
- In sign
- ♓︎ Pisces
Cicadas claim the scorching afternoon
St. David at a glance
- Today vs. normal: 10°F above the seasonal normal for this latitude
- Last frost: April 19 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
16-Day Forecast — St. David
- Sat88°68°50%
- Sun85°69°17%
- Mon83°66°5%
- Tue81°61°2%
- Wed85°64°5%
- Thu83°71°39%
- Fri79°66°39%
- Sat84°66°16%
- Sun71°59°7%
- Mon75°57°6%
- Tue76°61°8%
- Wed79°63°16%
- Thu83°65°14%
- Fri83°69°26%
- Sat86°69°26%
- Sun85°72°20%
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 — St. David
SPC has placed St. David 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 St. David
- 61563