Hamilton, Illinois Weather
Cicadas claim the scorching afternoon. Day 14 of summer. Read this microseason across nine climate regions →
Hamilton weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Overcast20%—90°72°—
- SundayJul 5Overcast20%—88°70°-2°
- MondayJul 6Light Drizzle11%—83°67°-5°
- TuesdayJul 7Clear——82°64°-1°
- WednesdayJul 8Overcast——87°64°+5°
- ThursdayJul 9Drizzle35%—85°72°-2°
- FridayJul 10Light Drizzle35%—84°70°-1°
AQI 28 (Good), driven by PM2.5. AQI projected to climb to 45 over the next 6 hours. PM2.5 at 10.1 µg/m³, PM10 at 11.1 µg/m³ — typical background levels with no transport signature.
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 41 now. With UV 2.8 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 15 around 1 PM.
- Present
- AQI 41
- UV peak
- 2.8 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 15
PM × Wind × Precip
PM2.5 at 10.1 µg/m³, PM10 at 11.1 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.91
- 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
- 11:00 PM
- Moonset
- 10:11 AM
- In sign
- ♓︎ Pisces
Cicadas claim the scorching afternoon
Hamilton at a glance
- Today vs. normal: 11°F above the seasonal normal for this latitude
- Last frost: April 18 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
ZIP code: 62341
16-Day Forecast — Hamilton
- Sat90°72°20%
- Sun88°70°20%
- Mon83°67°11%
- Tue82°64°2%
- Wed87°64°9%
- Thu85°72°35%
- Fri84°70°35%
- Sat85°69°17%
- Sun73°59°9%
- Mon76°57°5%
- Tue80°61°10%
- Wed81°65°12%
- Thu82°66°16%
- Fri83°68°19%
- Sat85°71°13%
- Sun88°72°14%
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 — Hamilton
SPC has placed Hamilton 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 Hamilton
- 62379
- 62341