As of 05:43 CDT

Weather in Merrimac, WI

56°

Merrimac, Sunday, 25 October, 05:43

Overcast. Feels like 55°. High 70°, low 55°.

Pressure30.33 inHg

Wind6.9 mph S

Humidity79%

Visibility6.2 mi

Dew point50°

See detailed hourly forecast

Monthly outlook for Merrimac, WI: average high 58.9°, average low 46°. That is 4.1° above the climate normal for October. Precipitation is expected on 8 days (about 2.1 inches), against a normal of 4 days and 1.3 inches. The warmest day looks like 25 October (70.4°), the coolest 8 November (29.9°).

58.9°/46°

Average high / low

+4.1°

Above normal

8 / 4

Wet days / normal

2.1 in

Precipitation this month

Ten-day blocks vs climate normal

Period	Forecast high	Normal	Difference
25 October – 3 November	64.3°	53°	+6.3°
4 November – 13 November	49.8°	47.1°	+1.5°
14 November – 23 November	at normal	43.3°	—

October records over 66 years

85.3°3 October 2025All-time high

21.2°30 October 1988All-time low

Climate normals and records are computed from the nearest reference point — Sauk City (9 mi).

Mon, 2664° / 49°

0.01

64 °

Merrimac, Monday, 26 October

Light rain. High 64°, low 49°.

Pressure30.39 inHg

Wind8.7 mph NE

Humidity42%

Visibility6.2 mi

Dew point35°

Tue, 2766° / 47°

66 °

Merrimac, Tuesday, 27 October

Overcast. High 66°, low 47°.

Pressure30.21 inHg

Wind9.8 mph SE

Humidity67%

Visibility6.2 mi

Dew point49°

Wed, 2870° / 55°

0.09

70 °

Merrimac, Wednesday, 28 October

Light rain. High 70°, low 55°.

Pressure30.09 inHg

Wind10 mph S

Humidity64%

Visibility6.2 mi

Dew point53°

Thu, 2962° / 50°

0.24

62 °

Merrimac, Thursday, 29 October

Rain. High 62°, low 50°.

Pressure30.09 inHg

Wind11.1 mph SW

Humidity93%

Visibility—

Dew point58°

Fri, 3061° / 44°

0.07

61 °

Merrimac, Friday, 30 October

Light rain. High 61°, low 44°.

Pressure30.15 inHg

Wind5.3 mph SE

Humidity69%

Visibility—

Dew point49°

Sat, 3163° / 54°

0.14

63 °

Merrimac, Saturday, 31 October

Light rain. High 63°, low 54°.

Pressure30.09 inHg

Wind6.3 mph SW

Humidity85%

Visibility—

Dew point57°

Sun, 0159° / 57°

0.03

59 °

Merrimac, Sunday, 1 November

Light rain. High 59°, low 57°.

Pressure30.03 inHg

Wind8.8 mph SE

Humidity94%

Visibility—

Dew point57°

Mon, 0264° / 56°

0.55

64 °

Merrimac, Monday, 2 November

Rain. High 64°, low 56°.

Pressure29.74 inHg

Wind12.8 mph S

Humidity95%

Visibility—

Dew point59°

Tue, 0364° / 43°

0.38

64 °

Merrimac, Tuesday, 3 November

Rain. High 64°, low 43°.

Pressure29.53 inHg

Wind17.9 mph W

Humidity89%

Visibility—

Dew point49°

Wed, 0446° / 43°

0.27

46 °

Merrimac, Wednesday, 4 November

Rain. High 46°, low 43°.

Pressure29.77 inHg

Wind18.4 mph W

Humidity83%

Visibility—

Dew point41°

Thu, 0555° / 38°

55 °

Merrimac, Thursday, 5 November

Overcast. High 55°, low 38°.

Pressure29.91 inHg

Wind10.2 mph NW

Humidity55%

Visibility—

Dew point36°

Fri, 0653° / 39°

53 °

Merrimac, Friday, 6 November

Overcast. High 53°, low 39°.

Pressure29.80 inHg

Wind11.4 mph SW

Humidity51%

Visibility—

Dew point34°

Sat, 0749° / 36°

49 °

Merrimac, Saturday, 7 November

Clear. High 49°, low 36°.

Pressure29.74 inHg

Wind15.6 mph NW

Humidity52%

Visibility—

Dew point28°

Sun, 0846° / 30°

46 °

Merrimac, Sunday, 8 November

Overcast. High 46°, low 30°.

Pressure30.00 inHg

Wind8.9 mph E

Humidity58%

Visibility—

Dew point29°

Mon, 0950° / 41°

0.34

50 °

Merrimac, Monday, 9 November

Rain. High 50°, low 41°.

Pressure29.59 inHg

Wind19.3 mph SE

Humidity89%

Visibility—

Dew point45°

From day 17 onward the outlook is built from 60-year climate statistics

Tue, 1046° / 34°

0.13

46 °

Merrimac, Tuesday, 10 November

Climate normal for this date — 60-year average.

Average high46°

Average low34°

Average precipitation0.13 in

Chance of precipitation33%

Record high71° (2022)

Record low13° (2017)

Wed, 1144° / 31°

0.07

44 °

Merrimac, Wednesday, 11 November

Climate normal for this date — 60-year average.

Average high44°

Average low31°

Average precipitation0.07 in

Chance of precipitation28%

Record high68° (1964)

Record low13° (2019)

Thu, 1243° / 30°

0.06

43 °

Merrimac, Thursday, 12 November

Climate normal for this date — 60-year average.

Average high43°

Average low30°

Average precipitation0.06 in

Chance of precipitation30%

Record high63° (1964)

Record low1° (2019)

Fri, 1344° / 31°

0.04

44 °

Merrimac, Friday, 13 November

Climate normal for this date — 60-year average.

Average high44°

Average low31°

Average precipitation0.04 in

Chance of precipitation18%

Record high67° (1999)

Record low6° (1986)

Sat, 1444° / 31°

0.03

44 °

Merrimac, Saturday, 14 November

Climate normal for this date — 60-year average.

Average high44°

Average low31°

Average precipitation0.03 in

Chance of precipitation20%

Record high66° (2025)

Record low15° (1986)

Sun, 1545° / 32°

0.06

45 °

Merrimac, Sunday, 15 November

Climate normal for this date — 60-year average.

Average high45°

Average low32°

Average precipitation0.06 in

Chance of precipitation28%

Record high67° (2001)

Record low18° (2014)

Mon, 1645° / 31°

0.06

45 °

Merrimac, Monday, 16 November

Climate normal for this date — 60-year average.

Average high45°

Average low31°

Average precipitation0.06 in

Chance of precipitation23%

Record high62° (1975)

Record low19° (1989)

Tue, 1745° / 32°

0.09

45 °

Merrimac, Tuesday, 17 November

Climate normal for this date — 60-year average.

Average high45°

Average low32°

Average precipitation0.09 in

Chance of precipitation25%

Record high68° (2016)

Record low12° (2005)

Wed, 1844° / 31°

0.07

44 °

Merrimac, Wednesday, 18 November

Climate normal for this date — 60-year average.

Average high44°

Average low31°

Average precipitation0.07 in

Chance of precipitation30%

Record high64° (2001)

Record low10° (2014)

Thu, 1944° / 31°

0.06

44 °

Merrimac, Thursday, 19 November

Climate normal for this date — 60-year average.

Average high44°

Average low31°

Average precipitation0.06 in

Chance of precipitation23%

Record high62° (1975)

Record low7° (1986)

Fri, 2042° / 31°

0.08

42 °

Merrimac, Friday, 20 November

Climate normal for this date — 60-year average.

Average high42°

Average low31°

Average precipitation0.08 in

Chance of precipitation30%

Record high61° (1982)

Record low10° (2022)

Sat, 2141° / 28°

0.08

41 °

Merrimac, Saturday, 21 November

Climate normal for this date — 60-year average.

Average high41°

Average low28°

Average precipitation0.08 in

Chance of precipitation25%

Record high64° (1990)

Record low6° (1964)

Sun, 2241° / 28°

0.03

41 °

Merrimac, Sunday, 22 November

Climate normal for this date — 60-year average.

Average high41°

Average low28°

Average precipitation0.03 in

Chance of precipitation15%

Record high61° (2012)

Record low5° (2015)

Mon, 2342° / 29°

0.1

42 °

Merrimac, Monday, 23 November

Climate normal for this date — 60-year average.

Average high42°

Average low29°

Average precipitation0.1 in

Chance of precipitation32%

Record high60° (1983)

Record low10° (1970)

About the monthly outlook

How accurate is a 30-day forecast?

The first 16 days come from weather models — reliable for the first 3–5 days and progressively less so after that. Days 17 through 30 for Merrimac, WI are built from the climate normal, the 60-year average, so they show typical weather for those dates rather than a specific forecast.

What does "above normal" mean?

We compare the forecast against the climate normal for those exact calendar days, computed from 60 years of observations. The deviation shows how much the coming month differs from a typical one.

Where do the 66-year records come from?

They are real temperature extremes recorded in Merrimac, WI since 1960: the highest and lowest reading for each calendar date, with the year it happened.

How often is it updated?

The forecast portion refreshes every hour; the climate portion is based on long-term data and stays stable.