Onalaska, Wisconsin Weather
Cicadas claim the afternoon. Day 14 of summer. Read this microseason across nine climate regions →
Onalaska weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Foggy20%—83°68°—
- SundayJul 5Overcast26%—82°69°-1°
- MondayJul 6Clear——80°65°-2°
- TuesdayJul 7Overcast——81°64°+1°
- WednesdayJul 8T-storm w/ Hail53%—79°65°-2°
- ThursdayJul 9Showers53%—78°65°-1°
- FridayJul 10Overcast12%—79°61°+1°
AQI 31 (Good), driven by PM2.5. AQI flat over the last 6 hours (within ±4 points). PM2.5 at 10.0 µg/m³, PM10 at 12.7 µg/m³ — typical background levels with no transport signature.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion during the projected peak around 10 PM.
What's driving it
Ozone × UV × Sky
Ozone at AQI 39 now. With UV 5.4 peaking around 1 PM under partly cloudy skies, surface ozone likely climbs to AQI 20 around 1 PM.
- Present
- AQI 39
- UV peak
- 5.4 at 1 PM
- Sky at peak
- partly cloudy
- Projected peak
- AQI 20
PM × Wind × Precip
PM2.5 at 10.0 µg/m³, PM10 at 12.7 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.79
- 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
- 11:05 PM
- Moonset
- 10:06 AM
- In sign
- ♓︎ Pisces
Cicadas claim the afternoon
Onalaska at a glance
- Today vs. normal: 7°F above the seasonal normal for this latitude
- Last frost: May 9 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
ZIP code: 54650
16-Day Forecast — Onalaska
- Sat83°68°20%
- Sun82°69°26%
- Mon80°65°2%
- Tue81°64°6%
- Wed79°65°53%
- Thu78°65°53%
- Fri79°61°12%
- Sat81°62°9%
- Sun73°56°11%
- Mon77°51°9%
- Tue78°60°7%
- Wed77°62°23%
- Thu80°66°23%
- Fri84°67°23%
- Sat84°69°29%
- Sun84°70°27%
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 — Onalaska
SPC includes Onalaska 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 Onalaska
- 54650