Marengo, Iowa Weather
Cicadas claim the afternoon. Day 15 of summer. Read this microseason across nine climate regions →
Marengo weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Rain72%0.25″86°67°—
- SundayJul 5Overcast10%—86°68°0°
- MondayJul 6Mostly Clear——88°67°+2°
- TuesdayJul 7Overcast——82°65°-6°
- WednesdayJul 8T-storm w/ Hail37%—85°66°+3°
- ThursdayJul 9Light Showers46%0.01″76°65°-9°
- FridayJul 10Light Drizzle11%—80°66°+4°
AQI 42 (Good), driven by PM2.5. AQI up 13 over the last 6 hours (gradual rise). PM2.5 at 6.2 µg/m³ (AQI 34) with a 0.87 fine-to-coarse ratio and 4 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
Ozone × UV × Sky
Ozone at AQI 34 now. With UV 0.0 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 8 around 1 PM.
- Present
- AQI 34
- UV peak
- 0.0 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 8
PM × Wind × Precip
PM2.5 at 6.2 µg/m³ (AQI 34) with a 0.87 fine-to-coarse ratio and 4 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.87
- 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
- 11:28 PM
- Moonset
- 11:20 AM
- In sign
- ♓︎ Pisces
Cicadas claim the afternoon
Marengo at a glance
- Today vs. normal: 6°F above the seasonal normal for this latitude
- Last frost: April 27 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
ZIP code: 52301
16-Day Forecast — Marengo
- Sat86°67°72%
- Sun86°68°10%
- Mon88°67°4%
- Tue82°65°1%
- Wed85°66°37%
- Thu76°65°46%
- Fri80°66°11%
- Sat75°64°8%
- Sun76°56°8%
- Mon81°60°5%
- Tue86°67°4%
- Wed85°67°21%
- Thu85°69°16%
- Fri88°73°19%
- Sat89°76°26%
- Sun82°63°17%
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 — Marengo
SPC includes Marengo 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 Marengo
- 52301