Jefferson, Iowa Weather
Cicadas claim the afternoon. Day 15 of summer. Read this microseason across nine climate regions →
Jefferson weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 5Foggy——86°68°—
- MondayJul 6Overcast——88°67°+2°
- TuesdayJul 7Overcast——86°66°-2°
- WednesdayJul 8T-storm w/ Hail51%—86°69°0°
- ThursdayJul 9Light Drizzle51%—79°63°-7°
- FridayJul 10Light Drizzle14%—84°63°+5°
- SaturdayJul 11Light Drizzle——78°65°-6°
AQI 35 (Good), driven by PM2.5. AQI down 5 over the last 6 hours (gradual decline). PM2.5 at 5.3 µg/m³ (AQI 29) with a 0.84 fine-to-coarse ratio and 2 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
PM × Wind × Precip
PM2.5 at 5.3 µg/m³ (AQI 29) with a 0.84 fine-to-coarse ratio and 2 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.84
- 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
- 11:37 PM
- Moonset
- 11:30 AM
- In sign
- ♓︎ Pisces
Cicadas claim the afternoon
Jefferson at a glance
- Today vs. normal: 3°F above the seasonal normal for this latitude
- Last frost: April 28 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
ZIP code: 50129
15-Day Forecast — Jefferson
- Sun86°68°8%
- Mon88°67°1%
- Tue86°66°2%
- Wed86°69°51%
- Thu79°63°51%
- Fri84°63°14%
- Sat78°65°6%
- Sun78°61°8%
- Mon84°62°5%
- Tue90°70°3%
- Wed86°69°8%
- Thu90°71°19%
- Fri93°75°13%
- Sat93°73°26%
- Sun82°64°10%
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 — Jefferson
SPC includes Jefferson 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 Jefferson
- 50129