Merrimac, WI Weather Forecast
Local 7-day forecast
Areas Of Fog
Track current conditions, temperature changes, wind, and the full daily outlook for Merrimac, WI in one place.
Areas of fog and a chance of showers and thunderstorms before 5am, then areas of fog and showers and thunderstorms. Mostly cloudy, with a low around 57. West wind around 0 mph. Chance of precipitation is 80%. New rainfall amounts less than a tenth of an inch possible.
Local Weather Overview
This forecast page for Merrimac, WI is designed for quick trip planning, giving you a clean read on daytime highs, overnight lows, and changing conditions across the upcoming forecast window. Latest sync: Apr 15, 2026 6:59 AM CDT.
The active forecast window currently covers Apr 15 to Apr 21, 2026 for Merrimac, WI.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Apr 15 to Apr 21, 2026
- Latest sync
- Apr 15, 2026 6:59 AM CDT
- Forecast office
- MKX
- Source
- NOAA / NWS
Daily Outlook
This Week in Merrimac
Friday looks like the warmest upcoming period in Merrimac at 78 degrees F.
Sunday Night is the coolest period ahead with temperatures near 29 degrees F.
The strongest winds are forecast for Friday at about 5 to 15 mph S.
Precipitation is mentioned in 9 upcoming forecast periods.
Forecast Details
- Last updated
- Apr 15, 2026 6:59 AM CDT
- Coverage
- 7 days
- Time zone
- America/Chicago
- Forecast office
- MKX
- Radar station
- KMKX
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
Areas of fog and showers and thunderstorms before 8am, then patchy fog and showers and thunderstorms likely between 8am and 1pm, then a chance of showers and thunderstorms between 1pm and 4pm, then showers and thunderstorms likely. Mostly cloudy, with a high near 70. Southwest wind around 5 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
Showers and thunderstorms likely before midnight, then a chance of showers and thunderstorms between midnight and 4am, then a chance of showers and thunderstorms. Mostly cloudy, with a low around 53. East wind around 5 mph. Chance of precipitation is 70%. New rainfall amounts between a half and three quarters of an inch possible.
A chance of showers and thunderstorms. Partly sunny, with a high near 68. North wind 0 to 5 mph. Chance of precipitation is 50%. New rainfall amounts between a tenth and quarter of an inch possible.
A chance of rain showers before 7pm. Mostly clear, with a low around 51. East wind 0 to 5 mph. Chance of precipitation is 40%. New rainfall amounts less than a tenth of an inch possible.
A chance of rain showers between 1pm and 4pm, then a chance of showers and thunderstorms. Partly sunny, with a high near 78. South wind 5 to 15 mph. Chance of precipitation is 40%. New rainfall amounts less than a tenth of an inch possible.
Showers and thunderstorms. Mostly cloudy. Low around 41, with temperatures rising to around 48 overnight. Southwest wind around 10 mph. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.
A chance of showers and thunderstorms. Partly sunny, with a high near 51. West wind 10 to 15 mph. Chance of precipitation is 50%. New rainfall amounts between a tenth and quarter of an inch possible.
A chance of rain showers before 7pm, then a slight chance of rain and snow showers between 7pm and 1am. Mostly cloudy, with a low around 30. Chance of precipitation is 40%.
Mostly sunny, with a high near 49.
Partly cloudy, with a low around 29.
Sunny, with a high near 60.
Partly cloudy, with a low around 44.
Mostly sunny, with a high near 69.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Overnight
Apr 15
|
Areas Of Fog
|
57°F |
0 mph
|
|
Wednesday
Apr 15
|
Areas Of Fog
|
70°F |
5 mph
SW
|
|
Wednesday Night
Apr 15
|
Showers And Thunderstorms Likely then Chance Showers And Thunderstorms
|
53°F |
5 mph
E
|
|
Thursday
Apr 16
|
Chance Showers And Thunderstorms
|
68°F |
0 to 5 mph
N
|
|
Thursday Night
Apr 16
|
Chance Rain Showers then Mostly Clear
|
51°F |
0 to 5 mph
E
|
|
Friday
Apr 17
|
Partly Sunny then Chance Showers And Thunderstorms
|
78°F |
5 to 15 mph
S
|
|
Friday Night
Apr 17
|
Showers And Thunderstorms
|
41°F |
10 mph
SW
|
|
Saturday
Apr 18
|
Chance Showers And Thunderstorms
|
51°F |
10 to 15 mph
W
|
|
Saturday Night
Apr 18
|
Slight Chance Rain And Snow Showers
|
30°F |
10 to 15 mph
W
|
|
Sunday
Apr 19
|
Mostly Sunny
|
49°F |
10 to 15 mph
NW
|
|
Sunday Night
Apr 19
|
Partly Cloudy
|
29°F |
0 to 10 mph
W
|
|
Monday
Apr 20
|
Sunny
|
60°F |
0 to 10 mph
S
|
|
Monday Night
Apr 20
|
Partly Cloudy
|
44°F |
5 to 10 mph
S
|
|
Tuesday
Apr 21
|
Mostly Sunny
|
69°F |
5 to 10 mph
SW
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Merrimac.