Decatur, Michigan Weather
Cicadas claim the afternoon. Day 14 of summer. Read this microseason across nine climate regions →
Decatur weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Heavy Rain80%0.48″81°69°—
- SundayJul 5Showers45%0.20″81°67°0°
- MondayJul 6Overcast10%—79°60°-2°
- TuesdayJul 7Mostly Clear——79°58°0°
- WednesdayJul 8Light Drizzle——81°62°+2°
- ThursdayJul 9Light Showers29%0.13″73°62°-8°
- FridayJul 10Overcast29%—82°60°+9°
AQI 39 (Good), driven by Ozone. AQI down 44 over the last 6 hours — air quality is improving sharply. Ozone at AQI 30 now. With UV 3.3 peaking around 1 PM under partly cloudy skies, surface ozone likely climbs to AQI 9 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 30 now. With UV 3.3 peaking around 1 PM under partly cloudy skies, surface ozone likely climbs to AQI 9 around 1 PM.
- Present
- AQI 30
- UV peak
- 3.3 at 1 PM
- Sky at peak
- partly cloudy
- Projected peak
- AQI 9
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
- 11:42 PM
- Moonset
- 10:47 AM
- In sign
- ♓︎ Pisces
Cicadas claim the afternoon
Decatur at a glance
- Today vs. normal: 69°F — typical for the season
- Last frost: April 29 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
ZIP code: 49045
15-Day Forecast — Decatur
- Sat82°69°80%
- Sun81°67°45%
- Mon79°60°10%
- Tue79°58°5%
- Wed81°62°9%
- Thu73°62°29%
- Fri82°60°29%
- Sat81°62°19%
- Sun73°64°11%
- Mon88°63°8%
- Tue72°61°12%
- Wed76°59°22%
- Thu79°59°35%
- Fri76°65°36%
- Sat76°60°16%
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 includes Decatur 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 Decatur
- 49045