Waterloo, Wisconsin Weather
Cicadas claim the afternoon. Day 14 of summer. Read this microseason across nine climate regions →
Waterloo weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Light Drizzle21%0.01″81°69°—
- SundayJul 5Overcast——84°64°+3°
- MondayJul 6Overcast——77°60°-7°
- TuesdayJul 7Overcast——80°56°+3°
- WednesdayJul 8Thunderstorm35%0.07″80°64°0°
- ThursdayJul 9Light Showers46%—74°64°-6°
- FridayJul 10Light Drizzle18%—77°61°+3°
AQI 28 (Good), driven by Ozone. AQI flat over the last 6 hours (within ±3 points). Ozone at AQI 43. Overcast through the UV peak window (cloud cover ~100%) — afternoon ozone should stay flat.
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 43. Overcast through the UV peak window (cloud cover ~100%) — afternoon ozone should stay flat.
- Present
- AQI 43
- UV peak
- 3.8 at 1 PM
- Sky at peak
- overcast
- Projected peak
- AQI 11
PM × Wind × Precip
PM2.5 at 5.4 µg/m³, PM10 at 6.7 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.81
- Wind
- light
- 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).
If the first of July be rainy weather, 'twill rain more or less for four weeks together.
- Moonrise
- 10:55 PM
- Moonset
- 9:58 AM
- In sign
- ♓︎ Pisces
Cicadas claim the afternoon
Waterloo at a glance
- Today vs. normal: 13°F above the seasonal normal for this latitude
- Last frost: May 5 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
ZIP code: 53594
16-Day Forecast — Waterloo
- Sat81°69°21%
- Sun84°64°6%
- Mon77°60°2%
- Tue80°56°1%
- Wed80°64°35%
- Thu74°64°46%
- Fri77°61°18%
- Sat75°59°8%
- Sun75°55°13%
- Mon73°54°8%
- Tue80°57°7%
- Wed77°62°20%
- Thu81°62°14%
- Fri78°66°19%
- Sat74°60°29%
- Sun73°54°29%
Forecast data from Open-Meteo (CC BY 4.0).
Right now in the garden
Peak growing season
As of July 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 — Waterloo
SPC includes Waterloo in the general thunderstorm area today — no severe risk, but storms are possible.
- TODAYTSTMGeneral Thunderstorms
- TOMORROWTSTMGeneral Thunderstorms
- DAY 3NONENo severe risk
Thunderstorms possible. Not severe, but capable of producing lightning and brief heavy rain.
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.
ZIP codes in Waterloo
- 53594