Monthly outlook for Greencastle, MO: average high 65.1°, average low 48.1°. That is 3.5° above the climate normal for October. Precipitation is expected on 3 days (about 0.3 inches), against a normal of 4 days and 1.7 inches. The warmest day looks like 30 October (77.3°), the coolest 1 November (32.6°).
65.1°/48.1°
Average high / low
+3.5°
Above normal
3 / 4
Wet days / normal
0.3 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
18 October – 27 October
66.6°
60.1°
+3.6°
28 October – 6 November
62.5°
55.3°
+4°
7 November – 16 November
at normal
50.4°
—
October records over 66 years
91.4°6 October 1963All-time high
18.9°27 October 1997All-time low
Climate normals and records are computed from the nearest reference point — Lemons (14 mi).
Mon, 1965° / 42°0
65 °
Greencastle, Monday, 19 October
Partly cloudy. High 65°, low 42°.
Pressure30.36 inHg
Wind6.1 mph S
Humidity59%
Visibility6.2 mi
Dew point46°
Tue, 2067° / 45°0
67 °
Greencastle, Tuesday, 20 October
Clear. High 67°, low 45°.
Pressure30.33 inHg
Wind5.8 mph S
Humidity55%
Visibility6.2 mi
Dew point48°
Wed, 2168° / 47°0
68 °
Greencastle, Wednesday, 21 October
Overcast. High 68°, low 47°.
Pressure30.27 inHg
Wind4.9 mph SW
Humidity54%
Visibility6.2 mi
Dew point49°
Thu, 2270° / 50°0
70 °
Greencastle, Thursday, 22 October
Clear. High 70°, low 50°.
Pressure30.27 inHg
Wind4.5 mph SE
Humidity56%
Visibility6.2 mi
Dew point50°
Fri, 2370° / 52°0
70 °
Greencastle, Friday, 23 October
Clear. High 70°, low 52°.
Pressure30.24 inHg
Wind11.9 mph SE
Humidity53%
Visibility—
Dew point49°
Sat, 2475° / 58°0.01
75 °
Greencastle, Saturday, 24 October
Light rain. High 75°, low 58°.
Pressure30.18 inHg
Wind15.9 mph SW
Humidity38%
Visibility—
Dew point45°
Sun, 2556° / 51°0.06
56 °
Greencastle, Sunday, 25 October
Light rain. High 56°, low 51°.
Pressure30.47 inHg
Wind10.6 mph N
Humidity61%
Visibility—
Dew point39°
Mon, 2667° / 51°0.01
67 °
Greencastle, Monday, 26 October
Light rain. High 67°, low 51°.
Pressure30.21 inHg
Wind7.2 mph E
Humidity61%
Visibility—
Dew point48°
Tue, 2764° / 57°0
64 °
Greencastle, Tuesday, 27 October
Overcast. High 64°, low 57°.
Pressure30.18 inHg
Wind9.2 mph S
Humidity44%
Visibility—
Dew point40°
Wed, 2864° / 54°0.1
64 °
Greencastle, Wednesday, 28 October
Light rain. High 64°, low 54°.
Pressure29.88 inHg
Wind10.8 mph S
Humidity91%
Visibility—
Dew point56°
Thu, 2971° / 56°0
71 °
Greencastle, Thursday, 29 October
Partly cloudy. High 71°, low 56°.
Pressure29.80 inHg
Wind8.1 mph W
Humidity51%
Visibility—
Dew point50°
Fri, 3077° / 56°0.13
77 °
Greencastle, Friday, 30 October
Light rain. High 77°, low 56°.
Pressure29.56 inHg
Wind17.9 mph SW
Humidity56%
Visibility—
Dew point55°
Sat, 3150° / 41°0
50 °
Greencastle, Saturday, 31 October
Clear. High 50°, low 41°.
Pressure29.77 inHg
Wind24.7 mph W
Humidity42%
Visibility—
Dew point25°
Sun, 0151° / 33°0
51 °
Greencastle, Sunday, 1 November
Clear. High 51°, low 33°.
Pressure30.30 inHg
Wind14 mph W
Humidity44%
Visibility—
Dew point25°
Mon, 0261° / 37°0
61 °
Greencastle, Monday, 2 November
Partly cloudy. High 61°, low 37°.
Pressure30.27 inHg
Wind14.5 mph S
Humidity36%
Visibility—
Dew point29°
From day 17 onward the outlook is built from 60-year climate statistics
Tue, 0354° / 40°0.1
54 °
Greencastle, Tuesday, 3 November
Climate normal for this date — 60-year average.
Average high54°
Average low40°
Average precipitation0.1 in
Chance of precipitation25%
Record high74° (1978)
Record low11° (1991)
Wed, 0453° / 40°0.11
53 °
Greencastle, Wednesday, 4 November
Climate normal for this date — 60-year average.
Average high53°
Average low40°
Average precipitation0.11 in
Chance of precipitation23%
Record high74° (1978)
Record low11° (1991)
Thu, 0553° / 38°0.06
53 °
Greencastle, Thursday, 5 November
Climate normal for this date — 60-year average.
Average high53°
Average low38°
Average precipitation0.06 in
Chance of precipitation30%
Record high71° (1978)
Record low22° (1991)
Fri, 0653° / 38°0.07
53 °
Greencastle, Friday, 6 November
Climate normal for this date — 60-year average.
Average high53°
Average low38°
Average precipitation0.07 in
Chance of precipitation20%
Record high70° (2020)
Record low19° (1991)
Sat, 0753° / 38°0.02
53 °
Greencastle, Saturday, 7 November
Climate normal for this date — 60-year average.
Average high53°
Average low38°
Average precipitation0.02 in
Chance of precipitation12%
Record high71° (1966)
Record low0° (1991)
Sun, 0853° / 38°0.04
53 °
Greencastle, Sunday, 8 November
Climate normal for this date — 60-year average.
Average high53°
Average low38°
Average precipitation0.04 in
Chance of precipitation23%
Record high75° (1999)
Record low-16° (1991)
Mon, 0953° / 38°0.13
53 °
Greencastle, Monday, 9 November
Climate normal for this date — 60-year average.
Average high53°
Average low38°
Average precipitation0.13 in
Chance of precipitation30%
Record high74° (1999)
Record low11° (1991)
Tue, 1051° / 36°0.11
51 °
Greencastle, Tuesday, 10 November
Climate normal for this date — 60-year average.
Average high51°
Average low36°
Average precipitation0.11 in
Chance of precipitation27%
Record high72° (2012)
Record low13° (2018)
Wed, 1149° / 34°0.07
49 °
Greencastle, Wednesday, 11 November
Climate normal for this date — 60-year average.
Average high49°
Average low34°
Average precipitation0.07 in
Chance of precipitation25%
Record high74° (1964)
Record low13° (2019)
Thu, 1248° / 33°0.07
48 °
Greencastle, Thursday, 12 November
Climate normal for this date — 60-year average.
Average high48°
Average low33°
Average precipitation0.07 in
Chance of precipitation28%
Record high69° (1999)
Record low6° (2019)
Fri, 1349° / 33°0.07
49 °
Greencastle, Friday, 13 November
Climate normal for this date — 60-year average.
Average high49°
Average low33°
Average precipitation0.07 in
Chance of precipitation18%
Record high74° (1999)
Record low7° (1986)
Sat, 1449° / 35°0.04
49 °
Greencastle, Saturday, 14 November
Climate normal for this date — 60-year average.
Average high49°
Average low35°
Average precipitation0.04 in
Chance of precipitation22%
Record high74° (2025)
Record low15° (1986)
Sun, 1549° / 35°0.06
49 °
Greencastle, Sunday, 15 November
Climate normal for this date — 60-year average.
Average high49°
Average low35°
Average precipitation0.06 in
Chance of precipitation20%
Record high73° (2025)
Record low6° (1972)
Mon, 1650° / 34°0.04
50 °
Greencastle, Monday, 16 November
Climate normal for this date — 60-year average.
Average high50°
Average low34°
Average precipitation0.04 in
Chance of precipitation15%
Record high69° (2001)
Record low18° (1997)
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 Greencastle, MO 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 Greencastle, MO 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.