Grand River, Iowa Weather
Fireflies pulse through the magnolias. Day 77 of spring. Read this microseason across nine climate regions →
Grand River weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 4Showers67%0.31″81°62°—
- FridayJun 5Thunderstorm77%2.2″81°68°0°
- SaturdayJun 6Thunderstorm35%0.65″86°69°+5°
- SundayJun 7Light Showers68%0.07″77°67°-9°
- MondayJun 8Thunderstorm52%—86°66°+9°
- TuesdayJun 9Thunderstorm21%—88°74°+2°
- WednesdayJun 10Thunderstorm14%—90°73°+2°
Ozone at AQI 500 now. AQI flat over the last 6 hours (within ±4 points). With UV 7.8 peaking around 1 PM under partly cloudy skies, surface ozone likely climbs to AQI 368 by mid-afternoon.
AVOID OUTDOORS Avoid outdoor exertion. Keep windows closed; use HEPA filtration indoors if available.
What's driving it
Ozone × UV × Sky
Ozone at AQI 500 now. With UV 7.8 peaking around 1 PM under partly cloudy skies, surface ozone likely climbs to AQI 368 by mid-afternoon.
- Present
- AQI 500
- UV peak
- 7.8 at 1 PM
- Sky at peak
- partly cloudy
- Projected peak
- AQI 368
PM × Wind × Precip
PM2.5 at 8.4 µg/m³, PM10 at 9.4 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.89
- Wind
- breezy
- 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).
A summer fog for fair, a winter fog for rain.
- Moonrise
- 4:48 AM
- Moonset
- 2:15 PM
- In sign
- ♒︎ Aquarius
Fireflies pulse through the magnolias
Grand River at a glance
- Today vs. normal: 4°F above the seasonal normal for this latitude
- Last frost: April 21 (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 — Grand River
SPC has placed Grand River 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.