Monthly outlook for Grenville, SD: average high 54.9°, average low 42°. That is 1.2° above the climate normal for October. Precipitation is expected on 4 days (about 1.3 inches), against a normal of 4 days and 1.1 inches. The warmest day looks like 21 October (66.4°), the coolest 27 October (34.5°).
54.9°/42°
Average high / low
+1.2°
Above normal
4 / 4
Wet days / normal
1.3 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
13 October – 22 October
57.8°
53.8°
+2.2°
23 October – 1 November
50°
49.7°
+0.2°
2 November – 11 November
at normal
43.3°
—
October records over 66 years
83.5°1 October 2023All-time high
12.4°26 October 2020All-time low
Climate normals and records are computed from the nearest reference point — Enemy Swim (6 mi).
Wed, 1451° / 40°0.05
51 °
Grenville, Wednesday, 14 October
Light rain. High 51°, low 40°.
Pressure30.27 inHg
Wind1.7 mph NE
Humidity66%
Visibility6.2 mi
Dew point39°
Thu, 1556° / 43°0.01
56 °
Grenville, Thursday, 15 October
Light rain. High 56°, low 43°.
Pressure30.15 inHg
Wind14.8 mph NW
Humidity68%
Visibility6.2 mi
Dew point44°
Fri, 1648° / 41°0
48 °
Grenville, Friday, 16 October
Mostly clear. High 48°, low 41°.
Pressure30.65 inHg
Wind13 mph N
Humidity64%
Visibility6.2 mi
Dew point32°
Sat, 1760° / 42°0
60 °
Grenville, Saturday, 17 October
Clear. High 60°, low 42°.
Pressure30.09 inHg
Wind18.3 mph SW
Humidity43%
Visibility—
Dew point32°
Sun, 1863° / 47°0
63 °
Grenville, Sunday, 18 October
Partly cloudy. High 63°, low 47°.
Pressure29.97 inHg
Wind14.6 mph SW
Humidity48%
Visibility—
Dew point40°
Mon, 1962° / 41°0
62 °
Grenville, Monday, 19 October
Clear. High 62°, low 41°.
Pressure30.15 inHg
Wind11.5 mph S
Humidity21%
Visibility—
Dew point17°
Tue, 2062° / 45°0
62 °
Grenville, Tuesday, 20 October
Partly cloudy. High 62°, low 45°.
Pressure29.97 inHg
Wind21.9 mph S
Humidity62%
Visibility—
Dew point47°
Wed, 2166° / 57°0.11
66 °
Grenville, Wednesday, 21 October
Light rain. High 66°, low 57°.
Pressure29.85 inHg
Wind16.9 mph S
Humidity88%
Visibility—
Dew point57°
Thu, 2262° / 47°0.22
62 °
Grenville, Thursday, 22 October
Light rain. High 62°, low 47°.
Pressure29.80 inHg
Wind13.2 mph N
Humidity93%
Visibility—
Dew point47°
Fri, 2355° / 39°0.84
55 °
Grenville, Friday, 23 October
Rain. High 55°, low 39°.
Pressure29.77 inHg
Wind22.5 mph W
Humidity88%
Visibility—
Dew point37°
Sat, 2452° / 41°0
52 °
Grenville, Saturday, 24 October
Partly cloudy. High 52°, low 41°.
Pressure30.30 inHg
Wind18.6 mph W
Humidity48%
Visibility—
Dew point30°
Sun, 2553° / 38°0
53 °
Grenville, Sunday, 25 October
Partly cloudy. High 53°, low 38°.
Pressure30.12 inHg
Wind23.8 mph NW
Humidity52%
Visibility—
Dew point33°
Mon, 2646° / 35°0
46 °
Grenville, Monday, 26 October
Partly cloudy. High 46°, low 35°.
Pressure30.36 inHg
Wind15.6 mph NW
Humidity56%
Visibility—
Dew point28°
Tue, 2750° / 35°0
50 °
Grenville, Tuesday, 27 October
Overcast. High 50°, low 35°.
Pressure29.88 inHg
Wind22.1 mph S
Humidity62%
Visibility—
Dew point35°
Wed, 2844° / 40°0.01
44 °
Grenville, Wednesday, 28 October
Light rain. High 44°, low 40°.
Pressure29.88 inHg
Wind17.5 mph NW
Humidity72%
Visibility—
Dew point34°
From day 17 onward the outlook is built from 60-year climate statistics
Thu, 2949° / 35°0.07
49 °
Grenville, Thursday, 29 October
Climate normal for this date — 60-year average.
Average high49°
Average low35°
Average precipitation0.07 in
Chance of precipitation30%
Record high66° (2007)
Record low18° (1991)
Fri, 3048° / 35°0.09
48 °
Grenville, Friday, 30 October
Climate normal for this date — 60-year average.
Average high48°
Average low35°
Average precipitation0.09 in
Chance of precipitation30%
Record high66° (2007)
Record low16° (1991)
Sat, 3147° / 33°0.08
47 °
Grenville, Saturday, 31 October
Climate normal for this date — 60-year average.
Average high47°
Average low33°
Average precipitation0.08 in
Chance of precipitation20%
Record high69° (1990)
Record low18° (1996)
Sun, 0146° / 34°0.06
46 °
Grenville, Sunday, 1 November
Climate normal for this date — 60-year average.
Average high46°
Average low34°
Average precipitation0.06 in
Chance of precipitation27%
Record high69° (1990)
Record low13° (1984)
Mon, 0246° / 33°0.05
46 °
Grenville, Monday, 2 November
Climate normal for this date — 60-year average.
Average high46°
Average low33°
Average precipitation0.05 in
Chance of precipitation22%
Record high71° (1978)
Record low10° (1991)
Tue, 0345° / 33°0.04
45 °
Grenville, Tuesday, 3 November
Climate normal for this date — 60-year average.
Average high45°
Average low33°
Average precipitation0.04 in
Chance of precipitation22%
Record high68° (1978)
Record low6° (1991)
Wed, 0445° / 31°0.02
45 °
Grenville, Wednesday, 4 November
Climate normal for this date — 60-year average.
Average high45°
Average low31°
Average precipitation0.02 in
Chance of precipitation12%
Record high67° (2015)
Record low3° (1991)
Thu, 0546° / 32°0.03
46 °
Grenville, Thursday, 5 November
Climate normal for this date — 60-year average.
Average high46°
Average low32°
Average precipitation0.03 in
Chance of precipitation15%
Record high69° (2016)
Record low11° (2003)
Fri, 0645° / 31°0.03
45 °
Grenville, Friday, 6 November
Climate normal for this date — 60-year average.
Average high45°
Average low31°
Average precipitation0.03 in
Chance of precipitation13%
Record high69° (2020)
Record low1° (1991)
Sat, 0745° / 31°0.04
45 °
Grenville, Saturday, 7 November
Climate normal for this date — 60-year average.
Average high45°
Average low31°
Average precipitation0.04 in
Chance of precipitation13%
Record high66° (1999)
Record low-1° (1991)
Sun, 0844° / 30°0.06
44 °
Grenville, Sunday, 8 November
Climate normal for this date — 60-year average.
Average high44°
Average low30°
Average precipitation0.06 in
Chance of precipitation18%
Record high68° (1999)
Record low7° (2003)
Mon, 0941° / 29°0.08
41 °
Grenville, Monday, 9 November
Climate normal for this date — 60-year average.
Average high41°
Average low29°
Average precipitation0.08 in
Chance of precipitation23%
Record high62° (1999)
Record low11° (2018)
Tue, 1039° / 27°0.08
39 °
Grenville, Tuesday, 10 November
Climate normal for this date — 60-year average.
Average high39°
Average low27°
Average precipitation0.08 in
Chance of precipitation23%
Record high59° (2015)
Record low5° (1986)
Wed, 1138° / 26°0.03
38 °
Grenville, Wednesday, 11 November
Climate normal for this date — 60-year average.
Average high38°
Average low26°
Average precipitation0.03 in
Chance of precipitation20%
Record high61° (2005)
Record low5° (1986)
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 Grenville, SD 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 Grenville, SD 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.