Monthly outlook for Grellton, WI: average high 63.8°, average low 50.4°. That is 3.9° above the climate normal for October. Precipitation is expected on 4 days (about 0.8 inches), against a normal of 5 days and 1.5 inches. The warmest day looks like 12 October (83.3°), the coolest 26 October (36.1°).
63.8°/50.4°
Average high / low
+3.9°
Above normal
4 / 5
Wet days / normal
0.8 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
12 October – 21 October
64°
57.9°
+3.4°
22 October – 31 October
63.5°
54.2°
+5.1°
1 November – 10 November
at normal
49.1°
—
October records over 66 years
84.9°3 October 2025All-time high
20.7°30 October 1988All-time low
Climate normals and records are computed from the nearest reference point — Reeseville (12 mi).
Tue, 1376° / 59°0.03
76 °
Grellton, Tuesday, 13 October
Light rain. High 76°, low 59°.
Pressure29.83 inHg
Wind12.9 mph NW
Humidity59%
Visibility6.2 mi
Dew point57°
Wed, 1467° / 54°0
67 °
Grellton, Wednesday, 14 October
Overcast. High 67°, low 54°.
Pressure30.12 inHg
Wind5.4 mph NE
Humidity62%
Visibility6.2 mi
Dew point52°
Thu, 1562° / 53°0.1
62 °
Grellton, Thursday, 15 October
Light rain. High 62°, low 53°.
Pressure30.12 inHg
Wind6.7 mph E
Humidity71%
Visibility6.2 mi
Dew point52°
Fri, 1656° / 46°0
56 °
Grellton, Friday, 16 October
Partly cloudy. High 56°, low 46°.
Pressure30.36 inHg
Wind20.5 mph N
Humidity51%
Visibility6.2 mi
Dew point36°
Sat, 1759° / 38°0
59 °
Grellton, Saturday, 17 October
Clear. High 59°, low 38°.
Pressure30.42 inHg
Wind13.6 mph SW
Humidity37%
Visibility—
Dew point29°
Sun, 1859° / 42°0
59 °
Grellton, Sunday, 18 October
Clear. High 59°, low 42°.
Pressure30.18 inHg
Wind21.2 mph SW
Humidity40%
Visibility—
Dew point32°
Mon, 1956° / 46°0.17
56 °
Grellton, Monday, 19 October
Light rain. High 56°, low 46°.
Pressure30.15 inHg
Wind13.3 mph SW
Humidity61%
Visibility—
Dew point42°
Tue, 2056° / 51°0
56 °
Grellton, Tuesday, 20 October
Overcast. High 56°, low 51°.
Pressure30.24 inHg
Wind6.5 mph S
Humidity87%
Visibility—
Dew point51°
Wed, 2166° / 53°0
66 °
Grellton, Wednesday, 21 October
Overcast. High 66°, low 53°.
Pressure30.33 inHg
Wind12.2 mph SE
Humidity85%
Visibility—
Dew point56°
Thu, 2267° / 55°0
67 °
Grellton, Thursday, 22 October
Overcast. High 67°, low 55°.
Pressure30.30 inHg
Wind13.3 mph S
Humidity75%
Visibility—
Dew point56°
Fri, 2370° / 62°0.3
70 °
Grellton, Friday, 23 October
Rain. High 70°, low 62°.
Pressure30.18 inHg
Wind10.9 mph SW
Humidity82%
Visibility—
Dew point63°
Sat, 2470° / 62°0.19
70 °
Grellton, Saturday, 24 October
Rain. High 70°, low 62°.
Pressure29.88 inHg
Wind20.1 mph S
Humidity64%
Visibility—
Dew point56°
Sun, 2562° / 47°0.01
62 °
Grellton, Sunday, 25 October
Light rain. High 62°, low 47°.
Pressure29.85 inHg
Wind21.6 mph W
Humidity72%
Visibility—
Dew point44°
Mon, 2656° / 36°0
56 °
Grellton, Monday, 26 October
Clear. High 56°, low 36°.
Pressure30.12 inHg
Wind14.5 mph NW
Humidity42%
Visibility—
Dew point29°
Tue, 2757° / 40°0
57 °
Grellton, Tuesday, 27 October
Overcast. High 57°, low 40°.
Pressure29.80 inHg
Wind21.4 mph N
Humidity55%
Visibility—
Dew point40°
From day 17 onward the outlook is built from 60-year climate statistics
Wed, 2853° / 40°0.05
53 °
Grellton, Wednesday, 28 October
Climate normal for this date — 60-year average.
Average high53°
Average low40°
Average precipitation0.05 in
Chance of precipitation27%
Record high68° (1974)
Record low25° (1969)
Thu, 2953° / 39°0.05
53 °
Grellton, Thursday, 29 October
Climate normal for this date — 60-year average.
Average high53°
Average low39°
Average precipitation0.05 in
Chance of precipitation15%
Record high78° (2024)
Record low24° (1980)
Fri, 3055° / 40°0.09
55 °
Grellton, Friday, 30 October
Climate normal for this date — 60-year average.
Average high55°
Average low40°
Average precipitation0.09 in
Chance of precipitation30%
Record high76° (2024)
Record low21° (1988)
Sat, 3153° / 40°0.09
53 °
Grellton, Saturday, 31 October
Climate normal for this date — 60-year average.
Average high53°
Average low40°
Average precipitation0.09 in
Chance of precipitation33%
Record high69° (1971)
Record low23° (2019)
Sun, 0152° / 39°0.2
52 °
Grellton, Sunday, 1 November
Climate normal for this date — 60-year average.
Average high52°
Average low39°
Average precipitation0.2 in
Chance of precipitation38%
Record high70° (2000)
Record low15° (2019)
Mon, 0251° / 38°0.12
51 °
Grellton, Monday, 2 November
Climate normal for this date — 60-year average.
Average high51°
Average low38°
Average precipitation0.12 in
Chance of precipitation33%
Record high71° (1961)
Record low19° (1991)
Tue, 0350° / 37°0.05
50 °
Grellton, Tuesday, 3 November
Climate normal for this date — 60-year average.
Average high50°
Average low37°
Average precipitation0.05 in
Chance of precipitation27%
Record high70° (2008)
Record low16° (1991)
Wed, 0449° / 37°0.08
49 °
Grellton, Wednesday, 4 November
Climate normal for this date — 60-year average.
Average high49°
Average low37°
Average precipitation0.08 in
Chance of precipitation25%
Record high71° (2008)
Record low13° (1991)
Thu, 0549° / 37°0.09
49 °
Grellton, Thursday, 5 November
Climate normal for this date — 60-year average.
Average high49°
Average low37°
Average precipitation0.09 in
Chance of precipitation28%
Record high68° (2015)
Record low18° (1991)
Fri, 0649° / 35°0.08
49 °
Grellton, Friday, 6 November
Climate normal for this date — 60-year average.
Average high49°
Average low35°
Average precipitation0.08 in
Chance of precipitation30%
Record high69° (1975)
Record low15° (1991)
Sat, 0748° / 35°0.03
48 °
Grellton, Saturday, 7 November
Climate normal for this date — 60-year average.
Average high48°
Average low35°
Average precipitation0.03 in
Chance of precipitation17%
Record high68° (2020)
Record low7° (1991)
Sun, 0848° / 35°0.04
48 °
Grellton, Sunday, 8 November
Climate normal for this date — 60-year average.
Average high48°
Average low35°
Average precipitation0.04 in
Chance of precipitation18%
Record high70° (2020)
Record low6° (2019)
Mon, 0948° / 35°0.1
48 °
Grellton, Monday, 9 November
Climate normal for this date — 60-year average.
Average high48°
Average low35°
Average precipitation0.1 in
Chance of precipitation35%
Record high73° (2020)
Record low19° (1991)
Tue, 1046° / 34°0.11
46 °
Grellton, Tuesday, 10 November
Climate normal for this date — 60-year average.
Average high46°
Average low34°
Average precipitation0.11 in
Chance of precipitation35%
Record high71° (2022)
Record low13° (2017)
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 Grellton, 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 Grellton, 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.