Harlan, Iowa Weather
Prairie lightning bugs rise. Day 77 of spring. Read this microseason across nine climate regions →
Harlan weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 4Light Rain85%0.21″77°66°—
- FridayJun 5Thunderstorm24%0.02″79°67°+2°
- SaturdayJun 6Overcast51%—87°66°+8°
- SundayJun 7Showers71%—81°68°-6°
- MondayJun 8Thunderstorm48%—87°64°+6°
- TuesdayJun 9Thunderstorm23%—92°67°+5°
- WednesdayJun 10Thunderstorm23%—95°74°+3°
Ozone at AQI 42 — peak already passed at 1 PM under overcast skies. AQI up 9 over the last 6 hours (gradual rise). Levels should ease through evening.
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 42 — peak already passed at 1 PM under overcast skies. Levels should ease through evening.
- Present
- AQI 42
- UV peak
- 0.6 at earlier today
- Sky at peak
- overcast
- Projected peak
- AQI 42
PM × Wind × Precip
PM scrubbed by 4 hours of recent rain — PM2.5 down to 5.5 µg/m³, PM10 to 5.9 µg/m³.
- PM2.5/PM10
- 0.93
- Wind
- light
- Recent rain
- 4h 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).
A summer fog for fair, a winter fog for rain.
- Moonrise
- 4:56 AM
- Moonset
- 2:18 PM
- In sign
- ♒︎ Aquarius
Prairie lightning bugs rise
Harlan at a glance
- Today vs. normal: 4°F below the seasonal normal for this latitude
- Last frost: April 26 (climatological average for this latitude)
- Microseason: Jun 1–5
- Planting window: Harvest spring lettuce before it bolts. Sow heat-tolerant greens.
Right now in the garden
Peak growing season
As of June 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 — Harlan
SPC has placed Harlan in the Slight Risk category for severe thunderstorms tomorrow.
- TODAYMRGLMarginal Risk
- TOMORROWSLGTSlight Risk
- DAY 3TSTMGeneral Thunderstorms
Scattered severe storms possible. A few tornadoes, hail, and damaging wind gusts possible.
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.