Harper, Iowa Weather
Cicadas claim the afternoon. Day 15 of summer. Read this microseason across nine climate regions →
Harper weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Rain55%0.20″85°68°—
- SundayJul 5Overcast15%—85°68°0°
- MondayJul 6Clear——86°67°+1°
- TuesdayJul 7Overcast——83°64°-3°
- WednesdayJul 8T-storm w/ Hail29%—86°65°+3°
- ThursdayJul 9Thunderstorm42%0.10″79°66°-7°
- FridayJul 10Light Drizzle17%—81°66°+2°
AQI 44 (Good), driven by PM2.5. AQI up 13 over the last 6 hours (gradual rise). PM2.5 at 6.0 µg/m³ (AQI 33) with a 0.85 fine-to-coarse ratio and 3 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 33 now. With UV 0.0 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 8 around 1 PM.
- Present
- AQI 33
- UV peak
- 0.0 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 8
PM × Wind × Precip
PM2.5 at 6.0 µg/m³ (AQI 33) with a 0.85 fine-to-coarse ratio and 3 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.85
- 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
- 11:27 PM
- Moonset
- 11:20 AM
- In sign
- ♓︎ Pisces
Cicadas claim the afternoon
Harper at a glance
- Today vs. normal: 7°F above the seasonal normal for this latitude
- Last frost: April 24 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
ZIP code: 52231
16-Day Forecast — Harper
- Sat85°68°55%
- Sun85°68°15%
- Mon86°67°3%
- Tue83°64°1%
- Wed86°65°29%
- Thu79°66°42%
- Fri81°66°17%
- Sat74°64°7%
- Sun76°55°10%
- Mon81°59°6%
- Tue85°66°5%
- Wed86°68°16%
- Thu88°69°23%
- Fri89°73°17%
- Sat90°75°16%
- Sun85°63°16%
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 — Harper
SPC includes Harper 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 Harper
- 52231