Monthly outlook for Williams Bay, WI: average high 56.8°, average low 41.3°. That is 1.3° above the climate normal for October. Precipitation is expected on 5 days (about 1.0 inches), against a normal of 5 days and 1.4 inches. The warmest day looks like 21 October (71.2°), the coolest 30 October (26.6°).
56.8°/41.3°
Average high / low
+1.3°
Above normal
5 / 5
Wet days / normal
1.0 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
20 October – 29 October
59.7°
55.7°
+2.2°
30 October – 8 November
51.9°
51.3°
+0.3°
9 November – 18 November
at normal
45.6°
—
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 — Darien (9 mi).
Wed, 2171° / 42°0
71 °
Williams Bay, Wednesday, 21 October
Clear. High 71°, low 42°.
Pressure30.24 inHg
Wind6.6 mph SW
Humidity56%
Visibility6.2 mi
Dew point49°
Thu, 2267° / 46°0
67 °
Williams Bay, Thursday, 22 October
Mostly clear. High 67°, low 46°.
Pressure30.27 inHg
Wind2.8 mph E
Humidity67%
Visibility6.2 mi
Dew point55°
Fri, 2367° / 52°0
67 °
Williams Bay, Friday, 23 October
Partly cloudy. High 67°, low 52°.
Pressure30.36 inHg
Wind6.3 mph SE
Humidity60%
Visibility6.2 mi
Dew point51°
Sat, 2466° / 50°0
66 °
Williams Bay, Saturday, 24 October
Overcast. High 66°, low 50°.
Pressure30.36 inHg
Wind10.9 mph S
Humidity62%
Visibility6.2 mi
Dew point49°
Sun, 2569° / 54°0
69 °
Williams Bay, Sunday, 25 October
Overcast. High 69°, low 54°.
Pressure30.33 inHg
Wind9.1 mph S
Humidity58%
Visibility—
Dew point50°
Mon, 2657° / 45°0.07
57 °
Williams Bay, Monday, 26 October
Light rain. High 57°, low 45°.
Pressure30.21 inHg
Wind14.9 mph NE
Humidity74%
Visibility—
Dew point48°
Tue, 2745° / 43°0.26
45 °
Williams Bay, Tuesday, 27 October
Light rain. High 45°, low 43°.
Pressure30.36 inHg
Wind16 mph NE
Humidity88%
Visibility—
Dew point40°
Wed, 2845° / 38°0.29
45 °
Williams Bay, Wednesday, 28 October
Light rain. High 45°, low 38°.
Pressure30.06 inHg
Wind17.5 mph N
Humidity95%
Visibility—
Dew point39°
Thu, 2943° / 32°0
43 °
Williams Bay, Thursday, 29 October
Mostly clear. High 43°, low 32°.
Pressure30.24 inHg
Wind14.6 mph NW
Humidity51%
Visibility—
Dew point24°
Fri, 3044° / 27°0
44 °
Williams Bay, Friday, 30 October
Mostly clear. High 44°, low 27°.
Pressure30.27 inHg
Wind9.9 mph S
Humidity35%
Visibility—
Dew point15°
Sat, 3149° / 38°0.01
49 °
Williams Bay, Saturday, 31 October
Light rain. High 49°, low 38°.
Pressure29.94 inHg
Wind17.9 mph S
Humidity46%
Visibility—
Dew point28°
Sun, 0161° / 47°0.06
61 °
Williams Bay, Sunday, 1 November
Light rain. High 61°, low 47°.
Pressure29.74 inHg
Wind19.7 mph S
Humidity78%
Visibility—
Dew point49°
Mon, 0260° / 38°0.31
60 °
Williams Bay, Monday, 2 November
Rain. High 60°, low 38°.
Pressure30.12 inHg
Wind19.9 mph NW
Humidity46%
Visibility—
Dew point30°
Tue, 0348° / 33°0
48 °
Williams Bay, Tuesday, 3 November
Clear. High 48°, low 33°.
Pressure30.47 inHg
Wind7.6 mph S
Humidity38%
Visibility—
Dew point21°
Wed, 0449° / 36°0
49 °
Williams Bay, Wednesday, 4 November
Overcast. High 49°, low 36°.
Pressure30.27 inHg
Wind12.8 mph W
Humidity56%
Visibility—
Dew point32°
From day 17 onward the outlook is built from 60-year climate statistics
Thu, 0550° / 37°0.11
50 °
Williams Bay, Thursday, 5 November
Climate normal for this date — 60-year average.
Average high50°
Average low37°
Average precipitation0.11 in
Chance of precipitation28%
Record high69° (1978)
Record low18° (1991)
Fri, 0650° / 36°0.09
50 °
Williams Bay, Friday, 6 November
Climate normal for this date — 60-year average.
Average high50°
Average low36°
Average precipitation0.09 in
Chance of precipitation32%
Record high69° (1975)
Record low19° (1991)
Sat, 0749° / 36°0.03
49 °
Williams Bay, Saturday, 7 November
Climate normal for this date — 60-year average.
Average high49°
Average low36°
Average precipitation0.03 in
Chance of precipitation17%
Record high67° (2020)
Record low10° (1991)
Sun, 0849° / 36°0.04
49 °
Williams Bay, Sunday, 8 November
Climate normal for this date — 60-year average.
Average high49°
Average low36°
Average precipitation0.04 in
Chance of precipitation17%
Record high70° (2020)
Record low13° (1991)
Mon, 0949° / 36°0.11
49 °
Williams Bay, Monday, 9 November
Climate normal for this date — 60-year average.
Average high49°
Average low36°
Average precipitation0.11 in
Chance of precipitation30%
Record high72° (2020)
Record low18° (1991)
Tue, 1048° / 35°0.1
48 °
Williams Bay, Tuesday, 10 November
Climate normal for this date — 60-year average.
Average high48°
Average low35°
Average precipitation0.1 in
Chance of precipitation35%
Record high71° (2022)
Record low14° (2017)
Wed, 1145° / 32°0.06
45 °
Williams Bay, Wednesday, 11 November
Climate normal for this date — 60-year average.
Average high45°
Average low32°
Average precipitation0.06 in
Chance of precipitation25%
Record high68° (1964)
Record low12° (2019)
Thu, 1244° / 31°0.06
44 °
Williams Bay, Thursday, 12 November
Climate normal for this date — 60-year average.
Average high44°
Average low31°
Average precipitation0.06 in
Chance of precipitation25%
Record high63° (1964)
Record low3° (2019)
Fri, 1344° / 31°0.04
44 °
Williams Bay, 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 low7° (1986)
Sat, 1445° / 32°0.06
45 °
Williams Bay, Saturday, 14 November
Climate normal for this date — 60-year average.
Average high45°
Average low32°
Average precipitation0.06 in
Chance of precipitation25%
Record high67° (1971)
Record low7° (1995)
Sun, 1545° / 33°0.07
45 °
Williams Bay, Sunday, 15 November
Climate normal for this date — 60-year average.
Average high45°
Average low33°
Average precipitation0.07 in
Chance of precipitation27%
Record high69° (2025)
Record low9° (1995)
Mon, 1645° / 32°0.05
45 °
Williams Bay, Monday, 16 November
Climate normal for this date — 60-year average.
Average high45°
Average low32°
Average precipitation0.05 in
Chance of precipitation17%
Record high62° (1988)
Record low18° (1997)
Tue, 1746° / 33°0.1
46 °
Williams Bay, Tuesday, 17 November
Climate normal for this date — 60-year average.
Average high46°
Average low33°
Average precipitation0.1 in
Chance of precipitation27%
Record high69° (2016)
Record low14° (2014)
Wed, 1846° / 33°0.09
46 °
Williams Bay, Wednesday, 18 November
Climate normal for this date — 60-year average.
Average high46°
Average low33°
Average precipitation0.09 in
Chance of precipitation28%
Record high65° (1999)
Record low11° (2014)
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 Williams Bay, 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 Williams Bay, 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.