Griswold, Iowa Weather
Cicadas claim the afternoon. Day 14 of summer. Read this microseason across nine climate regions →
Griswold weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Heavy Drizzle71%0.07″84°69°—
- SundayJul 5Heavy Drizzle13%0.04″86°68°+2°
- MondayJul 6Overcast——85°66°-1°
- TuesdayJul 7Overcast——84°66°-1°
- WednesdayJul 8Drizzle39%—92°68°+8°
- ThursdayJul 9Showers43%—83°68°-9°
- FridayJul 10Drizzle25%0.01″82°65°-1°
AQI 37 (Good), driven by PM2.5. AQI up 10 over the last 6 hours (gradual rise). PM2.5 at 9.8 µg/m³, PM10 at 13.7 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.
What's driving it
Ozone × UV × Sky
Ozone at AQI 46 — peak already passed at 1 PM under overcast skies. Levels should ease through evening.
- Present
- AQI 46
- UV peak
- 2.4 at earlier today
- Sky at peak
- overcast
- Projected peak
- AQI 46
PM × Wind × Precip
PM2.5 at 9.8 µg/m³, PM10 at 13.7 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.72
- 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
- 11:17 PM
- Moonset
- 10:25 AM
- In sign
- ♓︎ Pisces
Cicadas claim the afternoon
Griswold at a glance
- Today vs. normal: 13°F above the seasonal normal for this latitude
- Last frost: April 23 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
ZIP code: 51535
16-Day Forecast — Griswold
- Sat84°69°71%
- Sun86°68°13%
- Mon85°66°3%
- Tue84°66°1%
- Wed92°68°39%
- Thu83°68°43%
- Fri82°65°25%
- Sat77°59°8%
- Sun80°60°5%
- Mon81°60°3%
- Tue80°60°5%
- Wed81°59°13%
- Thu88°66°16%
- Fri90°66°14%
- Sat78°62°26%
- Sun73°61°18%
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 — Griswold
SPC includes Griswold 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 Griswold
- 51535