St. Augustine, Illinois Weather
Cicadas claim the scorching afternoon. Day 14 of summer. Read this microseason across nine climate regions →
St. Augustine weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Rain46%0.13″88°69°—
- SundayJul 5Overcast27%—84°70°-4°
- MondayJul 6Mostly Clear——83°64°-1°
- TuesdayJul 7Clear——81°61°-2°
- WednesdayJul 8Light Drizzle10%—84°64°+3°
- ThursdayJul 9Drizzle31%—83°72°-1°
- FridayJul 10Overcast31%—81°65°-2°
AQI 26 (Good), driven by PM2.5. AQI down 9 over the last 6 hours (gradual decline). PM2.5 at 5.7 µg/m³ (AQI 32) with a 0.85 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.
What's driving it
PM × Wind × Precip
PM2.5 at 5.7 µg/m³ (AQI 32) with a 0.85 fine-to-coarse ratio and 5 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.85
- 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
- 10:57 PM
- Moonset
- 10:07 AM
- In sign
- ♓︎ Pisces
Cicadas claim the scorching afternoon
St. Augustine at a glance
- Today vs. normal: 72°F — typical for the season
- Last frost: April 20 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
16-Day Forecast — St. Augustine
- Sat88°69°46%
- Sun84°70°27%
- Mon83°64°3%
- Tue81°61°5%
- Wed84°64°10%
- Thu83°72°31%
- Fri81°65°31%
- Sat83°66°15%
- Sun69°59°8%
- Mon74°56°5%
- Tue76°61°8%
- Wed79°64°16%
- Thu81°65°14%
- Fri82°68°26%
- Sat85°69°13%
- Sun83°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. Augustine
SPC has placed St. Augustine in the Marginal Risk category for severe thunderstorms today.
- TODAYMRGLMarginal Risk
- TOMORROWTSTMGeneral Thunderstorms
- DAY 3TSTMGeneral Thunderstorms
Isolated severe storms possible. Limited threat for hail or damaging wind.
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. Augustine
- 61474