Plymouth, Illinois Weather
Fireflies pulse through the magnolias. Day 77 of spring. Read this microseason across nine climate regions →
Plymouth weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 4Partly Cloudy——86°57°—
- FridayJun 5Thunderstorm48%0.47″86°69°0°
- SaturdayJun 6Drizzle48%—87°69°+1°
- SundayJun 7Showers51%0.01″85°69°-2°
- MondayJun 8Thunderstorm61%0.02″87°67°+2°
- TuesdayJun 9Showers30%0.34″85°67°-2°
- WednesdayJun 10Light Drizzle30%—85°71°0°
Ozone at AQI 46 now. AQI down 7 over the last 6 hours (steady decline since this morning). With UV 6.0 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 37 by mid-afternoon.
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 46 now. With UV 6.0 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 37 by mid-afternoon.
- Present
- AQI 46
- UV peak
- 6.0 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 37
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).
A summer fog for fair, a winter fog for rain.
- Moonrise
- 4:34 AM
- Moonset
- 2:05 PM
- In sign
- ♒︎ Aquarius
Fireflies pulse through the magnolias
Plymouth at a glance
- Today vs. normal: 3°F above the seasonal normal for this latitude
- Last frost: April 18 (climatological average for this latitude)
- Microseason: Jun 1–5
- Planting window: Harvest spring lettuce before it bolts. Sow heat-tolerant greens.
Right now in the garden
Peak growing season
As of June 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 tomorrow.
- TODAYTSTMGeneral Thunderstorms
- TOMORROWMRGLMarginal Risk
- 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.