Monthly outlook for Sun Prairie, WI: average high 59°, average low 44°. That is 2.3° above the climate normal for October. Precipitation is expected on 3 days (about 1.1 inches), against a normal of 5 days and 1.3 inches. The warmest day looks like 22 October (66.7°), the coolest 17 October (34.1°).
59°/44°
Average high / low
+2.3°
Above normal
3 / 5
Wet days / normal
1.1 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
16 October – 25 October
60.6°
56°
+2.5°
26 October – 4 November
56.4°
51.8°
+2.5°
5 November – 14 November
at normal
45.9°
—
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).
Sat, 1755° / 34°0
55 °
Sun Prairie, Saturday, 17 October
Clear. High 55°, low 34°.
Pressure30.50 inHg
Wind11.1 mph SW
Humidity45%
Visibility6.2 mi
Dew point32°
Sun, 1859° / 43°0
59 °
Sun Prairie, Sunday, 18 October
Clear. High 59°, low 43°.
Pressure30.36 inHg
Wind15.4 mph SW
Humidity54%
Visibility6.2 mi
Dew point39°
Mon, 1961° / 42°0
61 °
Sun Prairie, Monday, 19 October
Clear. High 61°, low 42°.
Pressure30.36 inHg
Wind5.9 mph S
Humidity59%
Visibility6.2 mi
Dew point44°
Tue, 2064° / 42°0
64 °
Sun Prairie, Tuesday, 20 October
Clear. High 64°, low 42°.
Pressure30.36 inHg
Wind6.5 mph SE
Humidity48%
Visibility—
Dew point40°
Wed, 2165° / 45°0
65 °
Sun Prairie, Wednesday, 21 October
Overcast. High 65°, low 45°.
Pressure30.27 inHg
Wind6.4 mph S
Humidity56%
Visibility—
Dew point44°
Thu, 2267° / 51°0.01
67 °
Sun Prairie, Thursday, 22 October
Light rain. High 67°, low 51°.
Pressure30.06 inHg
Wind11.6 mph NE
Humidity60%
Visibility—
Dew point50°
Fri, 2357° / 40°0
57 °
Sun Prairie, Friday, 23 October
Clear. High 57°, low 40°.
Pressure30.30 inHg
Wind11 mph E
Humidity56%
Visibility—
Dew point39°
Sat, 2460° / 42°0
60 °
Sun Prairie, Saturday, 24 October
Overcast. High 60°, low 42°.
Pressure30.27 inHg
Wind12.8 mph S
Humidity53%
Visibility—
Dew point39°
Sun, 2565° / 49°0
65 °
Sun Prairie, Sunday, 25 October
Overcast. High 65°, low 49°.
Pressure30.18 inHg
Wind8.2 mph S
Humidity50%
Visibility—
Dew point42°
Mon, 2664° / 47°0.01
64 °
Sun Prairie, Monday, 26 October
Light rain. High 64°, low 47°.
Pressure30.06 inHg
Wind12.4 mph SE
Humidity40%
Visibility—
Dew point36°
Tue, 2752° / 41°0
52 °
Sun Prairie, Tuesday, 27 October
Overcast. High 52°, low 41°.
Pressure30.18 inHg
Wind11.8 mph W
Humidity59%
Visibility—
Dew point36°
Wed, 2849° / 44°0.26
49 °
Sun Prairie, Wednesday, 28 October
Light rain. High 49°, low 44°.
Pressure30.15 inHg
Wind12.5 mph SE
Humidity95%
Visibility—
Dew point44°
Thu, 2965° / 51°0.8
65 °
Sun Prairie, Thursday, 29 October
Rain. High 65°, low 51°.
Pressure29.91 inHg
Wind13.8 mph S
Humidity88%
Visibility—
Dew point57°
Fri, 3056° / 46°0
56 °
Sun Prairie, Friday, 30 October
Overcast. High 56°, low 46°.
Pressure30.09 inHg
Wind10.1 mph NW
Humidity65%
Visibility—
Dew point43°
Sat, 3151° / 46°0
51 °
Sun Prairie, Saturday, 31 October
Overcast. High 51°, low 46°.
Pressure30.24 inHg
Wind18.4 mph NE
Humidity72%
Visibility—
Dew point41°
From day 17 onward the outlook is built from 60-year climate statistics
Sun, 0151° / 38°0.21
51 °
Sun Prairie, Sunday, 1 November
Climate normal for this date — 60-year average.
Average high51°
Average low38°
Average precipitation0.21 in
Chance of precipitation32%
Record high70° (2000)
Record low16° (2019)
Mon, 0250° / 37°0.12
50 °
Sun Prairie, Monday, 2 November
Climate normal for this date — 60-year average.
Average high50°
Average low37°
Average precipitation0.12 in
Chance of precipitation40%
Record high70° (1961)
Record low18° (1991)
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)
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.