Grafton, Iowa Weather
Cicadas claim the afternoon. Day 14 of summer. Read this microseason across nine climate regions →
Grafton weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Heavy Rain18%0.39″83°67°—
- SundayJul 5Rain12%0.26″80°66°-3°
- MondayJul 6Light Drizzle——81°64°+1°
- TuesdayJul 7Overcast——83°63°+2°
- WednesdayJul 8T-storm w/ Hail51%0.04″80°66°-3°
- ThursdayJul 9Overcast51%—78°59°-2°
- FridayJul 10Light Drizzle——78°62°0°
AQI 36 (Good), driven by Ozone. AQI flat over the last 6 hours (within ±3 points). Ozone at AQI 47 now. With UV 6.0 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 38 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 47 now. With UV 6.0 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 38 around 1 PM.
- Present
- AQI 47
- UV peak
- 6.0 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 38
PM × Wind × Precip
PM scrubbed by 2 hours of recent rain — PM2.5 down to 6.9 µg/m³, PM10 to 8.9 µg/m³.
- PM2.5/PM10
- 0.78
- Wind
- light
- Recent rain
- 2h in last 6h
- Pattern
- washed out
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
- 11:12 PM
- Moonset
- 10:14 AM
- In sign
- ♓︎ Pisces
Cicadas claim the afternoon
Grafton at a glance
- Today vs. normal: 15°F above the seasonal normal for this latitude
- Last frost: May 6 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
ZIP code: 50440
16-Day Forecast — Grafton
- Sat83°67°18%
- Sun80°66°12%
- Mon81°64°2%
- Tue83°63°4%
- Wed80°66°51%
- Thu78°59°51%
- Fri78°62°7%
- Sat75°56°8%
- Sun77°56°14%
- Mon79°57°9%
- Tue81°60°4%
- Wed80°60°16%
- Thu84°63°29%
- Fri82°61°29%
- Sat69°58°21%
- Sun76°61°26%
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 — Grafton
SPC includes Grafton in the general thunderstorm area today — no severe risk, but storms are possible.
- TODAYTSTMGeneral Thunderstorms
- TOMORROWTSTMGeneral Thunderstorms
- DAY 3TSTMGeneral Thunderstorms
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 Grafton
- 50440