Monthly outlook for Sun Prairie, WI: average high 58.8°, average low 43.6°. That is 2.6° above the climate normal for October. Precipitation is expected on 4 days (about 2.1 inches), against a normal of 5 days and 1.5 inches. The warmest day looks like 30 October (68.9°), the coolest 1 November (32.5°).
58.8°/43.6°
Average high / low
+2.6°
Above normal
4 / 5
Wet days / normal
2.1 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
18 October – 27 October
62°
55.2°
+3.8°
28 October – 6 November
53.5°
50.9°
+1.4°
7 November – 16 November
at normal
44.9°
—
October records over 66 years
85.1°3 October 2025All-time high
20.8°30 October 1988All-time low
Climate normals and records are computed from the nearest reference point — Windsor (5 mi).
Mon, 1966° / 43°0
66 °
Sun Prairie, Monday, 19 October
Partly cloudy. High 66°, low 43°.
Pressure30.39 inHg
Wind2.6 mph SW
Humidity62%
Visibility6.2 mi
Dew point46°
Tue, 2065° / 43°0
65 °
Sun Prairie, Tuesday, 20 October
Clear. High 65°, low 43°.
Pressure30.39 inHg
Wind4.7 mph SE
Humidity63%
Visibility6.2 mi
Dew point48°
Wed, 2167° / 44°0
67 °
Sun Prairie, Wednesday, 21 October
Clear. High 67°, low 44°.
Pressure30.27 inHg
Wind5.3 mph SW
Humidity61%
Visibility6.2 mi
Dew point49°
Thu, 2266° / 45°0
66 °
Sun Prairie, Thursday, 22 October
Mostly clear. High 66°, low 45°.
Pressure30.33 inHg
Wind1.6 mph E
Humidity67%
Visibility6.2 mi
Dew point51°
Fri, 2364° / 50°0
64 °
Sun Prairie, Friday, 23 October
Partly cloudy. High 64°, low 50°.
Pressure30.36 inHg
Wind8.2 mph SE
Humidity66%
Visibility—
Dew point49°
Sat, 2465° / 48°0
65 °
Sun Prairie, Saturday, 24 October
Overcast. High 65°, low 48°.
Pressure30.33 inHg
Wind14.7 mph SW
Humidity57%
Visibility—
Dew point46°
Sun, 2555° / 42°0.08
55 °
Sun Prairie, Sunday, 25 October
Light rain. High 55°, low 42°.
Pressure30.24 inHg
Wind19.3 mph W
Humidity35%
Visibility—
Dew point27°
Mon, 2658° / 38°0.39
58 °
Sun Prairie, Monday, 26 October
Rain. High 58°, low 38°.
Pressure30.15 inHg
Wind17.6 mph S
Humidity40%
Visibility—
Dew point30°
Tue, 2751° / 44°0.07
51 °
Sun Prairie, Tuesday, 27 October
Light rain. High 51°, low 44°.
Pressure30.21 inHg
Wind13.1 mph NE
Humidity75%
Visibility—
Dew point40°
Wed, 2849° / 43°0.02
49 °
Sun Prairie, Wednesday, 28 October
Light rain. High 49°, low 43°.
Pressure30.21 inHg
Wind8.7 mph E
Humidity89%
Visibility—
Dew point45°
Thu, 2956° / 50°0.02
56 °
Sun Prairie, Thursday, 29 October
Light rain. High 56°, low 50°.
Pressure30.00 inHg
Wind13.1 mph SE
Humidity93%
Visibility—
Dew point52°
Fri, 3069° / 55°0.03
69 °
Sun Prairie, Friday, 30 October
Light rain. High 69°, low 55°.
Pressure29.65 inHg
Wind22.5 mph SW
Humidity56%
Visibility—
Dew point52°
Sat, 3155° / 44°0
55 °
Sun Prairie, Saturday, 31 October
Overcast. High 55°, low 44°.
Pressure30.00 inHg
Wind18.4 mph SW
Humidity33%
Visibility—
Dew point24°
Sun, 0145° / 33°1.48
45 °
Sun Prairie, Sunday, 1 November
Snow. High 45°, low 33°.
Pressure29.77 inHg
Wind18.3 mph NE
Humidity100%
Visibility—
Dew point35°
Mon, 0247° / 33°0
47 °
Sun Prairie, Monday, 2 November
Mostly clear. High 47°, low 33°.
Pressure30.00 inHg
Wind11.1 mph W
Humidity79%
Visibility—
Dew point36°
From day 17 onward the outlook is built from 60-year climate statistics
Tue, 0350° / 36°0.05
50 °
Sun Prairie, Tuesday, 3 November
Climate normal for this date — 60-year average.
Average high50°
Average low36°
Average precipitation0.05 in
Chance of precipitation25%
Record high70° (1964)
Record low15° (1991)
Wed, 0449° / 37°0.08
49 °
Sun Prairie, Wednesday, 4 November
Climate normal for this date — 60-year average.
Average high49°
Average low37°
Average precipitation0.08 in
Chance of precipitation25%
Record high70° (2008)
Record low11° (1991)
Thu, 0549° / 36°0.09
49 °
Sun Prairie, Thursday, 5 November
Climate normal for this date — 60-year average.
Average high49°
Average low36°
Average precipitation0.09 in
Chance of precipitation27%
Record high68° (2015)
Record low18° (1991)
Fri, 0649° / 35°0.08
49 °
Sun Prairie, Friday, 6 November
Climate normal for this date — 60-year average.
Average high49°
Average low35°
Average precipitation0.08 in
Chance of precipitation30%
Record high68° (1975)
Record low14° (1991)
Sat, 0748° / 34°0.03
48 °
Sun Prairie, Saturday, 7 November
Climate normal for this date — 60-year average.
Average high48°
Average low34°
Average precipitation0.03 in
Chance of precipitation17%
Record high67° (2020)
Record low6° (1991)
Sun, 0848° / 34°0.04
48 °
Sun Prairie, Sunday, 8 November
Climate normal for this date — 60-year average.
Average high48°
Average low34°
Average precipitation0.04 in
Chance of precipitation20%
Record high70° (2020)
Record low2° (2019)
Mon, 0947° / 34°0.11
47 °
Sun Prairie, Monday, 9 November
Climate normal for this date — 60-year average.
Average high47°
Average low34°
Average precipitation0.11 in
Chance of precipitation33%
Record high72° (2020)
Record low18° (1991)
Tue, 1046° / 33°0.11
46 °
Sun Prairie, Tuesday, 10 November
Climate normal for this date — 60-year average.
Average high46°
Average low33°
Average precipitation0.11 in
Chance of precipitation38%
Record high70° (2022)
Record low12° (2017)
Wed, 1144° / 30°0.08
44 °
Sun Prairie, Wednesday, 11 November
Climate normal for this date — 60-year average.
Average high44°
Average low30°
Average precipitation0.08 in
Chance of precipitation30%
Record high68° (1964)
Record low11° (2019)
Thu, 1242° / 30°0.06
42 °
Sun Prairie, Thursday, 12 November
Climate normal for this date — 60-year average.
Average high42°
Average low30°
Average precipitation0.06 in
Chance of precipitation30%
Record high62° (1964)
Record low2° (2019)
Fri, 1343° / 30°0.04
43 °
Sun Prairie, Friday, 13 November
Climate normal for this date — 60-year average.
Average high43°
Average low30°
Average precipitation0.04 in
Chance of precipitation17%
Record high66° (1999)
Record low6° (1986)
Sat, 1444° / 31°0.04
44 °
Sun Prairie, Saturday, 14 November
Climate normal for this date — 60-year average.
Average high44°
Average low31°
Average precipitation0.04 in
Chance of precipitation22%
Record high65° (1971)
Record low12° (2019)
Sun, 1544° / 32°0.05
44 °
Sun Prairie, Sunday, 15 November
Climate normal for this date — 60-year average.
Average high44°
Average low32°
Average precipitation0.05 in
Chance of precipitation25%
Record high66° (2025)
Record low17° (1995)
Mon, 1644° / 31°0.05
44 °
Sun Prairie, Monday, 16 November
Climate normal for this date — 60-year average.
Average high44°
Average low31°
Average precipitation0.05 in
Chance of precipitation22%
Record high60° (1975)
Record low19° (1989)
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 Sun Prairie, 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 Sun Prairie, 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.