Mercer, Wisconsin Weather
Prairie lightning bugs rise. Day 78 of spring. Read this microseason across nine climate regions →
Mercer weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 5Light Rain48%0.26″76°60°—
- SaturdayJun 6Overcast15%—73°56°-3°
- SundayJun 7Overcast——83°51°+10°
- MondayJun 8Drizzle61%0.03″78°59°-5°
- TuesdayJun 9Light Drizzle61%—81°64°+3°
- WednesdayJun 10Foggy17%—90°65°+9°
- ThursdayJun 11Drizzle20%—96°71°+6°
AQI 48 (Good), driven by Ozone. AQI down 13 over the last 6 hours (steady decline since this morning). Ozone at AQI 43. Overcast through the UV peak window (cloud cover ~81%) — 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 ~81%) — afternoon ozone should stay flat.
- Present
- AQI 43
- UV peak
- 3.3 at 1 PM
- Sky at peak
- overcast
- Projected peak
- AQI 10
PM × Wind × Precip
PM2.5 at 7.3 µg/m³ (AQI 41) with a 0.96 fine-to-coarse ratio and 6 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.96
- Wind
- light
- Recent rain
- 0h in last 6h
- Pattern
- stagnant smoke
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
- 5:19 AM
- Moonset
- 2:51 PM
- In sign
- ♒︎ Aquarius
Prairie lightning bugs rise
Mercer at a glance
- Today vs. normal: 6°F below the seasonal normal for this latitude
- Last frost: May 23 (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 5, 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 — Mercer
SPC has placed Mercer in the Marginal Risk category for severe thunderstorms tomorrow.
- TODAYTSTMGeneral Thunderstorms
- TOMORROWMRGLMarginal Risk
- DAY 3NONENo severe 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.