Cortland, Illinois Weather
Solstice approaches — longest light. Day 88 of spring. Read this microseason across nine climate regions →
Cortland weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 15Overcast——75°50°—
- TuesdayJun 16Overcast26%—71°57°-4°
- WednesdayJun 17T-storm w/ Hvy Hail97%0.17″75°52°+4°
- ThursdayJun 18Light Drizzle65%—66°55°-9°
- FridayJun 19Overcast——66°50°0°
- SaturdayJun 20Light Drizzle13%0.08″65°53°-1°
- SundayJun 21Light Rain40%0.23″67°55°+2°
AQI 28 (Good), driven by Ozone. AQI flat over the last 6 hours (within ±3 points). Ozone at AQI 33 now. With UV 6.6 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 29 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 33 now. With UV 6.6 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 29 around 1 PM.
- Present
- AQI 33
- UV peak
- 6.6 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 29
PM × Wind × Precip
PM2.5 at 4.6 µg/m³, PM10 at 4.8 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.96
- Wind
- breezy
- 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).
A summer fog for fair, a winter fog for rain.
- Moonrise
- 5:19 AM
- Moonset
- 8:50 PM
- In sign
- ♋︎ Cancer
Solstice approaches — longest light
Cortland at a glance
- Today vs. normal: 8°F below the seasonal normal for this latitude
- Last frost: April 28 (climatological average for this latitude)
- Microseason: Jun 11–15
- Planting window: Stake and prune tomato suckers. Watch for squash vine borers.
16-Day Forecast — Cortland
- Mon75°50°2%
- Tue71°57°26%
- Wed75°52°97%
- Thu66°55°65%
- Fri66°50°5%
- Sat65°53°13%
- Sun67°55°40%
- Mon69°51°38%
- Tue73°51°12%
- Wed74°58°7%
- Thu78°58°11%
- Fri86°67°32%
- Sat86°73°35%
- Sun87°74°39%
- Mon79°65°42%
- Tue80°64°45%
Forecast data from Open-Meteo (CC BY 4.0).
Right now in the garden
Peak growing season
As of June 15, 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 — Cortland
SPC has placed Cortland in the Slight Risk category for severe thunderstorms day after tomorrow.
- TODAYTSTMGeneral Thunderstorms
- TOMORROWMRGLMarginal Risk
- DAY 3SLGTSlight Risk
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 Cortland
- 60112
- 60151