Weather Alert
Mercer Weather Warning NWS WEATHER ALERT FOR THE MERCER, WI AREA - Issued: 359 AM CDT Mon Sep 21 2026 Mercer Weather Warning

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Mercer, WI Weather Forecast

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Mercer, WI Weather Forecast

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Mercer WI weather - Clear - 63°F
Clear
63°F
Updated 12:37 pm
Feels Like 49°F
Humidity 49%
Wind ESE 8 mph
Barometer  30.35 in
Dew Point 44°F
Mercer WI weather - Clear - 17°C
Clear
17°C
Updated 12:37 pm
Feels Like 9°C
Humidity 49%
Wind ESE 13 km/h
Barometer  102.7 kPa
Dew Point 7°C
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Mercer Weather Forecast

REST OF TODAY TONIGHT TUESDAY TUESDAY NIGHT WEDNESDAY WEDNESDAY NIGHT THURSDAY THURSDAY NIGHT FRIDAY FRIDAY NIGHT SATURDAY SATURDAY NIGHT
Mercer, WI Weather - Rest Of Today Mostly Cloudy Mercer, WI Weather - Tonight Partly Cloudy Mercer, WI Weather - Tuesday Sunny Mercer, WI Weather - Tuesday Night Clear Mercer, WI Weather - Wednesday Sunny Mercer, WI Weather - Wednesday Night Mostly Clear Mercer, WI Weather - Thursday Mostly Cloudy Mercer, WI Weather - Thursday Night Mostly Cloudy Mercer, WI Weather - Friday Partly Cloudy Mercer, WI Weather - Friday Night Partly Cloudy Mercer, WI Weather - Saturday Partly Sunny Mercer, WI Weather - Saturday Night Chance Of Showers
Mostly Cloudy Partly Cloudy Sunny Clear Sunny Mostly Clear Mostly Cloudy Mostly Cloudy Partly Cloudy Partly Cloudy Partly Sunny Chance of Showers
Hi: 60°FHi: 16°C
 Lo: 35°FLo: 2°C Hi: 65°FHi: 18°C
 Lo: 35°FLo: 2°C Hi: 69°FHi: 21°C
 Lo: 39°FLo: 4°C Hi: 69°FHi: 21°C
Lo: 41°FLo: 5°C		 Hi: 69°FHi: 21°C
Lo: 41°FLo: 5°C		 Hi: 70°FHi: 21°C
Lo: 45°FLo: 7°C		 Hi: 70°FHi: 21°C
Lo: 45°FLo: 7°C		 Hi: 69°FHi: 21°C
 Hi: 70°FHi: 21°C
Lo: 45°FLo: 7°C
POP: 20%
POP = Probability of Precipitation.
Weather Outlook Updated: 951 AM CDT Mon Sep 21 2026 Mercer, WI Weather - WeatherWorld.com

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Issued: 623 AM CDT Mon Sep 21 2026

Key Messages

  • A Frost Advisory is in effect early this morning for the Borderlands
  • Persistent northeasterly winds will keep the threat for rip currents going at Twin Port beaches today and may linger into mid-week as well. They will also create hazardous conditions on Lake Superior through Tuesday.
  • Widespread frost and perhaps some areas of freeze are forecast for tonight into Tuesday morning. Additional chilly nights with the potential for frost are expected Tuesday night into Wednesday.
  • Low chan...