As of 04:52 CDT

Weather in Merrimac, WI

45°Current weather

Merrimac, Thursday, 22 October, 04:52

Clear. Feels like 45°. High 74°, low 45°.

Pressure30.21 inHg
Wind0.7 mph SW
Humidity90%
Visibility6.2 mi
Dew point42°

Monthly outlook for Merrimac, WI: average high 58.8°, average low 45°. That is 3.2° above the climate normal for October. Precipitation is expected on 3 days (about 0.3 inches), against a normal of 5 days and 1.5 inches. The warmest day looks like 23 October (74.3°), the coolest 6 November (36.5°).

58.8°/45°
Average high / low
+3.2°
Above normal
3 / 5
Wet days / normal
0.3 in
Precipitation this month

Ten-day blocks vs climate normal

PeriodForecast highNormalDifference
22 October – 31 October61.5°54.6°+3.9°
1 November – 10 November54.2°49.3°+2.8°
11 November – 20 Novemberat normal44°—

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).

Fri, 2374° / 50°0Overcast
74 °Overcast

Merrimac, Friday, 23 October

Overcast. High 74°, low 50°.

Pressure30.27 inHg
Wind7.2 mph S
Humidity55%
Visibility6.2 mi
Dew point51°
Sat, 2468° / 55°0Overcast
68 °Overcast

Merrimac, Saturday, 24 October

Overcast. High 68°, low 55°.

Pressure30.30 inHg
Wind10.7 mph S
Humidity57%
Visibility6.2 mi
Dew point49°
Sun, 2570° / 56°0Partly cloudy
70 °Partly cloudy

Merrimac, Sunday, 25 October

Partly cloudy. High 70°, low 56°.

Pressure30.36 inHg
Wind3.7 mph W
Humidity63%
Visibility6.2 mi
Dew point52°
Mon, 2658° / 53°0Overcast
58 °Overcast

Merrimac, Monday, 26 October

Overcast. High 58°, low 53°.

Pressure30.45 inHg
Wind9.3 mph NE
Humidity52%
Visibility—
Dew point40°
Tue, 2757° / 49°0.11Light rain
57 °Light rain

Merrimac, Tuesday, 27 October

Light rain. High 57°, low 49°.

Pressure30.33 inHg
Wind8.3 mph E
Humidity66%
Visibility—
Dew point44°
Wed, 2850° / 44°0.01Light rain
50 °Light rain

Merrimac, Wednesday, 28 October

Light rain. High 50°, low 44°.

Pressure30.21 inHg
Wind5.2 mph E
Humidity84%
Visibility—
Dew point43°
Thu, 2951° / 46°0.06Light rain
51 °Light rain

Merrimac, Thursday, 29 October

Light rain. High 51°, low 46°.

Pressure30.18 inHg
Wind5.5 mph E
Humidity81%
Visibility—
Dew point45°
Fri, 3056° / 49°0.14Light rain
56 °Light rain

Merrimac, Friday, 30 October

Light rain. High 56°, low 49°.

Pressure29.83 inHg
Wind13 mph SE
Humidity96%
Visibility—
Dew point53°
Sat, 3157° / 47°0.01Light rain
57 °Light rain

Merrimac, Saturday, 31 October

Light rain. High 57°, low 47°.

Pressure29.74 inHg
Wind8 mph N
Humidity67%
Visibility—
Dew point44°
Sun, 0159° / 42°0Clear
59 °Clear

Merrimac, Sunday, 1 November

Clear. High 59°, low 42°.

Pressure29.91 inHg
Wind10.2 mph W
Humidity44%
Visibility—
Dew point35°
Mon, 0253° / 39°0Clear
53 °Clear

Merrimac, Monday, 2 November

Clear. High 53°, low 39°.

Pressure30.27 inHg
Wind7.3 mph NE
Humidity47%
Visibility—
Dew point30°
Tue, 0353° / 37°0Overcast
53 °Overcast

Merrimac, Tuesday, 3 November

Overcast. High 53°, low 37°.

Pressure30.42 inHg
Wind5.5 mph E
Humidity44%
Visibility—
Dew point29°
Wed, 0452° / 37°0Overcast
52 °Overcast

Merrimac, Wednesday, 4 November

Overcast. High 52°, low 37°.

Pressure30.50 inHg
Wind11.3 mph E
Humidity53%
Visibility—
Dew point33°
Thu, 0553° / 37°0Overcast
53 °Overcast

Merrimac, Thursday, 5 November

Overcast. High 53°, low 37°.

Pressure30.39 inHg
Wind11.9 mph E
Humidity44%
Visibility—
Dew point29°
Fri, 0656° / 36°0Clear
56 °Clear

Merrimac, Friday, 6 November

Clear. High 56°, low 36°.

Pressure30.24 inHg
Wind3.6 mph E
Humidity47%
Visibility—
Dew point32°
From day 17 onward the outlook is built from 60-year climate statistics
Sat, 0749° / 35°0.03Climate normal
49 °Climate normal

Merrimac, Saturday, 7 November

Climate normal for this date — 60-year average.

Average high49°
Average low35°
Average precipitation0.03 in
Chance of precipitation18%
Record high68° (2020)
Record low0° (1991)
Sun, 0848° / 35°0.04Climate normal
48 °Climate normal

Merrimac, Sunday, 8 November

Climate normal for this date — 60-year average.

Average high48°
Average low35°
Average precipitation0.04 in
Chance of precipitation22%
Record high71° (2020)
Record low3° (2019)
Mon, 0948° / 35°0.1Climate normal
48 °Climate normal

Merrimac, Monday, 9 November

Climate normal for this date — 60-year average.

Average high48°
Average low35°
Average precipitation0.1 in
Chance of precipitation35%
Record high72° (2020)
Record low18° (1991)
Tue, 1046° / 34°0.13Climate normal
46 °Climate normal

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°0.07Climate normal
44 °Climate normal

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°0.06Climate normal
43 °Climate normal

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°0.04Climate normal
44 °Climate normal

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°0.03Climate normal
44 °Climate normal

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°0.06Climate normal
45 °Climate normal

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°0.06Climate normal
45 °Climate normal

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°0.09Climate normal
45 °Climate normal

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°0.07Climate normal
44 °Climate normal

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°0.06Climate normal
44 °Climate normal

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°0.08Climate normal
42 °Climate normal

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)

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.