Keystone, Indiana Weather
Cicadas claim the scorching afternoon. Day 14 of summer. Read this microseason across nine climate regions →
Keystone weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Heavy Rain39%0.38″88°69°—
- SundayJul 5Overcast42%—83°70°-5°
- MondayJul 6Thunderstorm23%0.02″77°66°-6°
- TuesdayJul 7Overcast——80°59°+3°
- WednesdayJul 8Overcast——81°61°+1°
- ThursdayJul 9Heavy Drizzle46%—81°67°0°
- FridayJul 10Light Drizzle43%0.01″79°70°-2°
AQI 43 (Good), driven by Ozone. AQI up 10 over the last 6 hours (gradual rise). Ozone at AQI 100 now. With UV 8.1 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 108 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 100 now. With UV 8.1 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 108 around 1 PM.
- Present
- AQI 100
- UV peak
- 8.1 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 108
PM × Wind × Precip
PM2.5 at 12.7 µg/m³ (AQI 58) with a 0.90 fine-to-coarse ratio and 4 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.90
- 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
- 11:36 PM
- Moonset
- 10:46 AM
- In sign
- ♓︎ Pisces
Cicadas claim the scorching afternoon
Keystone at a glance
- Today vs. normal: 15°F above the seasonal normal for this latitude
- Last frost: April 20 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
ZIP code: 46759
16-Day Forecast — Keystone
- Sat88°69°39%
- Sun83°70°42%
- Mon77°66°23%
- Tue80°59°5%
- Wed81°61°5%
- Thu81°67°46%
- Fri79°70°43%
- Sat73°62°29%
- Sun73°56°12%
- Mon73°55°12%
- Tue75°54°11%
- Wed78°59°29%
- Thu82°60°29%
- Fri82°65°19%
- Sat73°69°23%
- Sun74°67°32%
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 — Keystone
SPC has placed Keystone 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 Keystone
- 46759