Troy, Illinois Weather
Cicadas claim the scorching afternoon. Day 15 of summer. Read this microseason across nine climate regions →
Troy weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 5Overcast19%—86°69°—
- MondayJul 6Overcast——86°70°0°
- TuesdayJul 7Light Drizzle——85°69°-1°
- WednesdayJul 8Partly Cloudy——86°65°+1°
- ThursdayJul 9Light Drizzle34%—94°72°+8°
- FridayJul 10Thunderstorm46%—87°71°-7°
- SaturdayJul 11Drizzle38%—84°68°-3°
AQI 47 (Good), driven by PM2.5. AQI flat over the last 6 hours (within ±3 points). PM2.5 at 8.6 µg/m³ (AQI 48) with a 0.86 fine-to-coarse ratio and 3 mph wind — combustion smoke trapped in calm air, not road dust.
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 47. Overcast through the UV peak window (cloud cover ~87%) — afternoon ozone should stay flat.
- Present
- AQI 47
- UV peak
- 4.7 at 1 PM
- Sky at peak
- overcast
- Projected peak
- AQI 15
PM × Wind × Precip
PM2.5 at 8.6 µg/m³ (AQI 48) with a 0.86 fine-to-coarse ratio and 3 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.86
- Wind
- calm
- Recent rain
- 0h in last 6h
- Pattern
- stagnant smoke
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
- 11:17 PM
- Moonset
- 11:12 AM
- In sign
- ♓︎ Pisces
Cicadas claim the scorching afternoon
Troy at a glance
- Today vs. normal: 4°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: 62294
16-Day Forecast — Troy
- Sun86°69°19%
- Mon86°70°7%
- Tue85°69°3%
- Wed86°65°3%
- Thu94°72°34%
- Fri87°71°46%
- Sat84°68°38%
- Sun89°70°15%
- Mon93°72°15%
- Tue100°76°5%
- Wed82°66°12%
- Thu81°58°14%
- Fri85°63°28%
- Sat92°67°29%
- Sun93°75°26%
- Mon91°75°16%
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 — Troy
SPC includes Troy 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 Troy
- 62294