Onslow, Iowa Weather
Prairie lightning bugs rise. Day 76 of spring. Read this microseason across nine climate regions →
Onslow weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 3Overcast——82°56°—
- ThursdayJun 4Overcast32%—86°59°+4°
- FridayJun 5Thunderstorm79%0.15″79°67°-7°
- SaturdayJun 6Showers64%—81°65°+2°
- SundayJun 7Light Showers25%—81°66°0°
- MondayJun 8Light Drizzle49%0.01″73°68°-8°
- TuesdayJun 9Light Drizzle31%—80°69°+7°
Ozone at AQI 500 now. AQI flat over the last 6 hours (within ±3 points). With UV 8.0 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 531 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 8.0 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 531 by mid-afternoon.
- Present
- AQI 500
- UV peak
- 8.0 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 531
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).
The higher the clouds, the finer the weather.
- Moonrise
- 4:04 AM
- Moonset
- 12:55 PM
- In sign
- ♑︎ Capricorn
Prairie lightning bugs rise
Onslow at a glance
- Today vs. normal: 5°F above the seasonal normal for this latitude
- Last frost: April 29 (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 3, 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 — Onslow
SPC has placed Onslow in the Marginal Risk category for severe thunderstorms day after tomorrow.
- TODAYNONENo severe risk
- TOMORROWTSTMGeneral Thunderstorms
- DAY 3MRGLMarginal Risk
Isolated severe storms possible. Limited threat for hail or damaging wind.
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.