Norwalk, Iowa Weather
Prairie lightning bugs rise. Day 76 of spring. Read this microseason across nine climate regions →
Norwalk weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 3Partly Cloudy——82°57°—
- ThursdayJun 4Overcast34%—85°62°+3°
- FridayJun 5Thunderstorm71%0.56″86°68°+1°
- SaturdayJun 6Showers50%0.02″85°63°-1°
- SundayJun 7Showers45%—83°68°-2°
- MondayJun 8Light Showers54%—79°68°-4°
- TuesdayJun 9Drizzle24%—84°69°+5°
Ozone at AQI 83 now. AQI up 10 over the last 6 hours (gradual rise). With UV 8.7 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 96 by mid-afternoon.
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 83 now. With UV 8.7 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 96 by mid-afternoon.
- Present
- AQI 83
- UV peak
- 8.7 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 96
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
- 4:13 AM
- Moonset
- 1:08 PM
- In sign
- ♑︎ Capricorn
Prairie lightning bugs rise
Norwalk at a glance
- Today vs. normal: 7°F above the seasonal normal for this latitude
- Last frost: April 25 (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 — Norwalk
SPC has placed Norwalk in the Marginal Risk category for severe thunderstorms tomorrow.
- TODAYNONENo severe risk
- TOMORROWMRGLMarginal Risk
- 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.