Decatur, Indiana Weather
Cicadas claim the scorching afternoon. Day 14 of summer. Read this microseason across nine climate regions →
Decatur weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Overcast20%—88°70°—
- SundayJul 5Overcast28%—81°69°-7°
- MondayJul 6Overcast22%—81°67°0°
- TuesdayJul 7Mostly Clear——83°61°+2°
- WednesdayJul 8Mostly Clear——84°63°+1°
- ThursdayJul 9Thunderstorm40%—80°65°-4°
- FridayJul 10Light Drizzle38%—79°69°-1°
AQI 34 (Good), driven by PM2.5. AQI down 10 over the last 6 hours (gradual decline). PM2.5 at 9.0 µg/m³, PM10 at 10.0 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 8 PM.
What's driving it
Ozone × UV × Sky
Ozone at AQI 50 now. With UV 4.9 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 33 around 1 PM.
- Present
- AQI 50
- UV peak
- 4.9 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 33
PM × Wind × Precip
PM2.5 at 9.0 µg/m³, PM10 at 10.0 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.90
- 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
- 11:35 PM
- Moonset
- 10:44 AM
- In sign
- ♓︎ Pisces
Cicadas claim the scorching afternoon
Decatur at a glance
- Today vs. normal: 9°F above the seasonal normal for this latitude
- Last frost: April 21 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
ZIP code: 46733
16-Day Forecast — Decatur
- Sat88°70°20%
- Sun81°69°28%
- Mon81°67°22%
- Tue83°61°5%
- Wed84°63°9%
- Thu80°65°40%
- Fri79°69°38%
- Sat84°65°21%
- Sun73°62°21%
- Mon70°61°12%
- Tue74°59°10%
- Wed83°62°26%
- Thu85°66°35%
- Fri81°69°26%
- Sat86°66°29%
- Sun87°70°29%
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 — Decatur
SPC has placed Decatur 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 Decatur
- 46733