Monmouth, Illinois Weather
Cicadas claim the scorching afternoon. Day 15 of summer. Read this microseason across nine climate regions →
Monmouth weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 5Foggy——86°69°—
- MondayJul 6Mostly Clear——86°66°0°
- TuesdayJul 7Partly Cloudy——82°62°-4°
- WednesdayJul 8Overcast——84°65°+2°
- ThursdayJul 9T-storm w/ Hail38%1.3″84°68°0°
- FridayJul 10Thunderstorm44%0.01″78°68°-6°
- SaturdayJul 11Light Drizzle22%0.01″82°66°+4°
AQI 26 (Good), driven by Ozone. Ozone at AQI 44 now. With UV 6.9 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 41 around 1 PM.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion.
What's driving it
Ozone × UV × Sky
Ozone at AQI 44 now. With UV 6.9 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 41 around 1 PM.
- Present
- AQI 44
- UV peak
- 6.9 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 41
PM × Wind × Precip
PM2.5 at 6.3 µg/m³ (AQI 35) with a 0.83 fine-to-coarse ratio and 5 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.83
- 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
- 11:21 PM
- Moonset
- 11:14 AM
- In sign
- ♓︎ Pisces
Cicadas claim the scorching afternoon
Monmouth at a glance
- Today vs. normal: 11°F above the seasonal normal for this latitude
- Last frost: April 21 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
ZIP code: 61462
16-Day Forecast — Monmouth
- Sun86°69°3%
- Mon86°66°2%
- Tue82°62°0%
- Wed84°65°5%
- Thu84°68°38%
- Fri78°68°44%
- Sat82°66°22%
- Sun85°69°10%
- Mon90°71°5%
- Tue89°76°4%
- Wed75°61°8%
- Thu76°56°26%
- Fri82°64°23%
- Sat85°67°32%
- Sun87°72°26%
- Mon89°72°16%
Forecast data from Open-Meteo (CC BY 4.0).
Right now in the garden
Peak growing season
As of July 5, 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 — Monmouth
SPC includes Monmouth in the general thunderstorm area today — no severe risk, but storms are possible.
- 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 Monmouth
- 61462