Plymouth, Illinois Weather
Cicadas claim the scorching afternoon. Day 14 of summer. Read this microseason across nine climate regions →
Plymouth weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Overcast25%—89°71°—
- SundayJul 5Overcast21%—86°70°-3°
- MondayJul 6Overcast——83°66°-3°
- TuesdayJul 7Clear——81°62°-2°
- WednesdayJul 8Overcast——87°64°+6°
- ThursdayJul 9Thunderstorm40%—86°71°-1°
- FridayJul 10Light Drizzle40%—84°69°-2°
AQI 27 (Good), driven by PM2.5. AQI projected to climb to 44 over the next 6 hours. PM2.5 at 9.7 µg/m³, PM10 at 10.9 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 42 now. With UV 3.3 peaking around 1 PM under partly cloudy skies, surface ozone likely climbs to AQI 13 around 1 PM.
- Present
- AQI 42
- UV peak
- 3.3 at 1 PM
- Sky at peak
- partly cloudy
- Projected peak
- AQI 13
PM × Wind × Precip
PM2.5 at 9.7 µg/m³, PM10 at 10.9 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.89
- 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
- 10:58 PM
- Moonset
- 10:09 AM
- In sign
- ♓︎ Pisces
Cicadas claim the scorching afternoon
Plymouth at a glance
- Today vs. normal: 15°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: 62367
16-Day Forecast — Plymouth
- Sat89°71°25%
- Sun86°70°21%
- Mon83°66°6%
- Tue81°62°2%
- Wed87°64°6%
- Thu86°71°40%
- Fri84°69°40%
- Sat84°68°18%
- Sun73°59°9%
- Mon75°57°6%
- Tue77°60°10%
- Wed81°64°16%
- Thu82°65°16%
- Fri82°68°19%
- Sat86°70°13%
- Sun88°72°13%
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 — Plymouth
SPC has placed Plymouth 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 Plymouth
- 62367