St. Jacob, Illinois Weather
Cicadas claim the scorching afternoon. Day 14 of summer. Read this microseason across nine climate regions →
St. Jacob weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Overcast17%—93°74°—
- SundayJul 5Heavy Rain19%0.93″83°71°-10°
- MondayJul 6Light Drizzle18%—87°70°+4°
- TuesdayJul 7Overcast14%—85°67°-2°
- WednesdayJul 8Overcast15%—88°66°+3°
- ThursdayJul 9Overcast31%—90°71°+2°
- FridayJul 10Thunderstorm31%0.01″87°72°-3°
AQI 40 (Good), driven by Ozone. AQI flat over the last 6 hours (within ±3 points). Ozone at AQI 35 now. With UV 3.0 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 14 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 35 now. With UV 3.0 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 14 around 1 PM.
- Present
- AQI 35
- UV peak
- 3.0 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 14
PM × Wind × Precip
PM2.5 at 5.1 µg/m³, PM10 at 5.4 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.94
- Wind
- light
- Recent rain
- 0h in last 6h
- Pattern
- background
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
- 10:52 PM
- Moonset
- 10:06 AM
- In sign
- ♓︎ Pisces
Cicadas claim the scorching afternoon
St. Jacob at a glance
- Today vs. normal: 11°F above the seasonal normal for this latitude
- Last frost: April 8 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
16-Day Forecast — St. Jacob
- Sat93°74°17%
- Sun83°71°19%
- Mon87°70°18%
- Tue85°67°14%
- Wed88°66°15%
- Thu90°71°31%
- Fri87°72°31%
- Sat87°73°19%
- Sun77°61°11%
- Mon74°58°2%
- Tue77°60°6%
- Wed81°64°12%
- Thu81°66°14%
- Fri82°69°10%
- Sat85°69°13%
- Sun88°73°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 — St. Jacob
SPC has placed St. Jacob 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. Jacob
- 62249
- 62281