Monthly outlook for Merton, WI: average high 55.4°, average low 40.5°. That is 0.2° below the climate normal for October. Precipitation is expected on 5 days (about 0.9 inches), against a normal of 5 days and 1.3 inches. The warmest day looks like 23 October (66.1°), the coolest 30 October (26.4°).
55.4°/40.5°
Average high / low
−0.2°
Below normal
5 / 5
Wet days / normal
0.9 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
15 October – 24 October
60.9°
56.9°
+2.2°
25 October – 3 November
46.2°
53°
-3.8°
4 November – 13 November
at normal
47.5°
—
October records over 66 years
84.9°3 October 2025All-time high
23°30 October 1988All-time low
Climate normals and records are computed from the nearest reference point — North Prairie (15 mi).
Fri, 1657° / 42°0.07
57 °
Merton, Friday, 16 October
Light rain. High 57°, low 42°.
Pressure30.06 inHg
Wind15.9 mph N
Humidity87%
Visibility3.0 mi
Dew point44°
Sat, 1754° / 35°0
54 °
Merton, Saturday, 17 October
Clear. High 54°, low 35°.
Pressure30.50 inHg
Wind8.6 mph SW
Humidity51%
Visibility6.2 mi
Dew point33°
Sun, 1859° / 43°0
59 °
Merton, Sunday, 18 October
Clear. High 59°, low 43°.
Pressure30.39 inHg
Wind15 mph SW
Humidity48%
Visibility6.2 mi
Dew point36°
Mon, 1962° / 42°0
62 °
Merton, Monday, 19 October
Overcast. High 62°, low 42°.
Pressure30.36 inHg
Wind9.1 mph SW
Humidity53%
Visibility—
Dew point41°
Tue, 2063° / 46°0
63 °
Merton, Tuesday, 20 October
Clear. High 63°, low 46°.
Pressure30.33 inHg
Wind6 mph E
Humidity49%
Visibility—
Dew point41°
Wed, 2164° / 48°0
64 °
Merton, Wednesday, 21 October
Clear. High 64°, low 48°.
Pressure30.36 inHg
Wind7.9 mph SE
Humidity54%
Visibility—
Dew point45°
Thu, 2266° / 47°0
66 °
Merton, Thursday, 22 October
Overcast. High 66°, low 47°.
Pressure30.27 inHg
Wind8.4 mph S
Humidity50%
Visibility—
Dew point44°
Fri, 2366° / 51°0
66 °
Merton, Friday, 23 October
Overcast. High 66°, low 51°.
Pressure30.15 inHg
Wind13.4 mph S
Humidity47%
Visibility—
Dew point43°
Sat, 2458° / 53°0.05
58 °
Merton, Saturday, 24 October
Light rain. High 58°, low 53°.
Pressure30.12 inHg
Wind13.6 mph S
Humidity91%
Visibility—
Dew point53°
Sun, 2554° / 41°0.24
54 °
Merton, Sunday, 25 October
Rain. High 54°, low 41°.
Pressure30.09 inHg
Wind14.6 mph W
Humidity52%
Visibility—
Dew point33°
Mon, 2645° / 32°0
45 °
Merton, Monday, 26 October
Clear. High 45°, low 32°.
Pressure30.27 inHg
Wind15.9 mph W
Humidity48%
Visibility—
Dew point24°
Tue, 2741° / 27°0
41 °
Merton, Tuesday, 27 October
Mostly clear. High 41°, low 27°.
Pressure30.24 inHg
Wind12.3 mph W
Humidity38%
Visibility—
Dew point15°
Wed, 2852° / 28°0.01
52 °
Merton, Wednesday, 28 October
Light rain. High 52°, low 28°.
Pressure30.00 inHg
Wind14.5 mph SW
Humidity58%
Visibility—
Dew point31°
Thu, 2946° / 33°0.09
46 °
Merton, Thursday, 29 October
Light rain. High 46°, low 33°.
Pressure30.09 inHg
Wind11.5 mph NW
Humidity49%
Visibility—
Dew point25°
Fri, 3038° / 26°0
38 °
Merton, Friday, 30 October
Partly cloudy. High 38°, low 26°.
Pressure30.06 inHg
Wind19.1 mph NW
Humidity39%
Visibility—
Dew point14°
From day 17 onward the outlook is built from 60-year climate statistics
Sat, 3153° / 41°0.08
53 °
Merton, Saturday, 31 October
Climate normal for this date — 60-year average.
Average high53°
Average low41°
Average precipitation0.08 in
Chance of precipitation40%
Record high69° (1974)
Record low24° (2019)
Sun, 0152° / 40°0.18
52 °
Merton, Sunday, 1 November
Climate normal for this date — 60-year average.
Average high52°
Average low40°
Average precipitation0.18 in
Chance of precipitation42%
Record high71° (2016)
Record low19° (2019)
Mon, 0251° / 39°0.12
51 °
Merton, Monday, 2 November
Climate normal for this date — 60-year average.
Average high51°
Average low39°
Average precipitation0.12 in
Chance of precipitation37%
Record high72° (1961)
Record low21° (1991)
Tue, 0351° / 38°0.05
51 °
Merton, Tuesday, 3 November
Climate normal for this date — 60-year average.
Average high51°
Average low38°
Average precipitation0.05 in
Chance of precipitation25%
Record high70° (1964)
Record low16° (1991)
Wed, 0450° / 39°0.08
50 °
Merton, Wednesday, 4 November
Climate normal for this date — 60-year average.
Average high50°
Average low39°
Average precipitation0.08 in
Chance of precipitation23%
Record high69° (2008)
Record low13° (1991)
Thu, 0550° / 38°0.1
50 °
Merton, Thursday, 5 November
Climate normal for this date — 60-year average.
Average high50°
Average low38°
Average precipitation0.1 in
Chance of precipitation30%
Record high69° (1978)
Record low18° (1991)
Fri, 0649° / 37°0.08
49 °
Merton, Friday, 6 November
Climate normal for this date — 60-year average.
Average high49°
Average low37°
Average precipitation0.08 in
Chance of precipitation30%
Record high69° (1975)
Record low18° (1991)
Sat, 0749° / 36°0.03
49 °
Merton, Saturday, 7 November
Climate normal for this date — 60-year average.
Average high49°
Average low36°
Average precipitation0.03 in
Chance of precipitation18%
Record high67° (2020)
Record low10° (1991)
Sun, 0849° / 36°0.04
49 °
Merton, Sunday, 8 November
Climate normal for this date — 60-year average.
Average high49°
Average low36°
Average precipitation0.04 in
Chance of precipitation20%
Record high69° (2020)
Record low12° (1991)
Mon, 0949° / 37°0.1
49 °
Merton, Monday, 9 November
Climate normal for this date — 60-year average.
Average high49°
Average low37°
Average precipitation0.1 in
Chance of precipitation30%
Record high73° (2020)
Record low19° (1991)
Tue, 1047° / 35°0.1
47 °
Merton, Tuesday, 10 November
Climate normal for this date — 60-year average.
Average high47°
Average low35°
Average precipitation0.1 in
Chance of precipitation33%
Record high72° (2022)
Record low15° (2017)
Wed, 1145° / 33°0.07
45 °
Merton, Wednesday, 11 November
Climate normal for this date — 60-year average.
Average high45°
Average low33°
Average precipitation0.07 in
Chance of precipitation27%
Record high67° (1964)
Record low13° (2019)
Thu, 1243° / 32°0.05
43 °
Merton, Thursday, 12 November
Climate normal for this date — 60-year average.
Average high43°
Average low32°
Average precipitation0.05 in
Chance of precipitation30%
Record high62° (1964)
Record low2° (2019)
Fri, 1344° / 31°0.04
44 °
Merton, Friday, 13 November
Climate normal for this date — 60-year average.
Average high44°
Average low31°
Average precipitation0.04 in
Chance of precipitation20%
Record high66° (1989)
Record low7° (2019)
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 Merton, 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 Merton, 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.