Salem, Illinois Weather
Cicadas claim the scorching afternoon. Day 14 of summer. Read this microseason across nine climate regions →
Salem weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Overcast18%—94°73°—
- SundayJul 5Light Showers22%0.19″81°72°-13°
- MondayJul 6Light Drizzle22%—86°70°+5°
- TuesdayJul 7Overcast——84°67°-2°
- WednesdayJul 8Partly Cloudy13%—86°67°+2°
- ThursdayJul 9Light Drizzle33%—88°72°+2°
- FridayJul 10Thunderstorm36%0.08″86°71°-2°
AQI 41 (Good), driven by Ozone. AQI flat over the last 6 hours (within ±3 points). Ozone at AQI 39 now. With UV 3.7 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 19 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 39 now. With UV 3.7 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 19 around 1 PM.
- Present
- AQI 39
- UV peak
- 3.7 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 19
PM × Wind × Precip
PM2.5 at 5.3 µg/m³, PM10 at 5.6 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.95
- 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
- 10:49 PM
- Moonset
- 10:03 AM
- In sign
- ♓︎ Pisces
Cicadas claim the scorching afternoon
Salem at a glance
- Today vs. normal: 15°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.
ZIP code: 62881
16-Day Forecast — Salem
- Sat94°73°18%
- Sun81°72°22%
- Mon86°70°22%
- Tue84°67°8%
- Wed86°67°13%
- Thu88°72°33%
- Fri86°71°36%
- Sat86°72°29%
- Sun76°61°11%
- Mon73°58°7%
- Tue78°60°11%
- Wed82°64°10%
- Thu81°66°16%
- Fri78°69°13%
- Sat85°69°23%
- Sun88°73°29%
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 — Salem
SPC has placed Salem 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 Salem
- 62881