Waterloo, Iowa Weather
Prairie lightning bugs rise. Day 76 of spring. Read this microseason across nine climate regions →
Waterloo weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 3Mostly Clear——84°59°—
- ThursdayJun 4Overcast42%—86°62°+2°
- FridayJun 5Thunderstorm78%0.69″80°67°-6°
- SaturdayJun 6Light Showers59%—84°65°+4°
- SundayJun 7Drizzle23%—81°65°-3°
- MondayJun 8Light Showers54%—77°65°-4°
- TuesdayJun 9Light Drizzle36%—82°68°+5°
Ozone at AQI 80 now. AQI up 8 over the last 6 hours (gradual rise). With UV 7.8 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 83 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 80 now. With UV 7.8 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 83 by mid-afternoon.
- Present
- AQI 80
- UV peak
- 7.8 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 83
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
- 4:11 AM
- Moonset
- 12:59 PM
- In sign
- ♑︎ Capricorn
Prairie lightning bugs rise
Waterloo at a glance
- Today vs. normal: 10°F above the seasonal normal for this latitude
- Last frost: May 1 (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 — Waterloo
SPC has placed Waterloo in the Slight Risk category for severe thunderstorms day after tomorrow.
- TODAYNONENo severe risk
- TOMORROWMRGLMarginal Risk
- DAY 3SLGTSlight Risk
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.