Mattoon, Illinois Weather
Cicadas claim the scorching afternoon. Day 15 of summer. Read this microseason across nine climate regions →
Mattoon weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 5Light Drizzle15%0.02″84°70°—
- MondayJul 6Overcast12%—81°67°-3°
- TuesdayJul 7Overcast12%—80°66°-1°
- WednesdayJul 8Overcast——83°64°+3°
- ThursdayJul 9T-storm w/ Hail44%0.43″86°69°+3°
- FridayJul 10Light Drizzle49%0.02″85°72°-1°
- SaturdayJul 11Drizzle28%—80°69°-5°
AQI 26 (Good), driven by Ozone. AQI flat over the last 6 hours (within ±3 points). Ozone at AQI 37 now. With UV 4.8 peaking around 1 PM under partly cloudy skies, surface ozone likely climbs to AQI 17 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 37 now. With UV 4.8 peaking around 1 PM under partly cloudy skies, surface ozone likely climbs to AQI 17 around 1 PM.
- Present
- AQI 37
- UV peak
- 4.8 at 1 PM
- Sky at peak
- partly cloudy
- Projected peak
- AQI 17
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
- 11:11 PM
- Moonset
- 11:06 AM
- In sign
- ♓︎ Pisces
Cicadas claim the scorching afternoon
Mattoon at a glance
- Today vs. normal: 5°F above the seasonal normal for this latitude
- Last frost: April 13 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
ZIP code: 61938
16-Day Forecast — Mattoon
- Sun85°70°15%
- Mon81°67°12%
- Tue80°66°12%
- Wed83°64°5%
- Thu86°69°44%
- Fri85°72°49%
- Sat80°69°28%
- Sun86°68°16%
- Mon88°70°8%
- Tue90°75°6%
- Wed79°61°5%
- Thu78°56°29%
- Fri81°61°26%
- Sat88°65°32%
- Sun87°71°32%
- Mon87°72°29%
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 — Mattoon
SPC includes Mattoon in the general thunderstorm area today — no severe risk, but storms are possible.
- TODAYTSTMGeneral Thunderstorms
- TOMORROWTSTMGeneral Thunderstorms
- 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 Mattoon
- 61938