Monthly outlook for Grenville, SD: average high 54.6°, average low 39.3°. That is 0.2° above the climate normal for October. Precipitation is expected on 3 days (about 0.4 inches), against a normal of 4 days and 1.2 inches. The warmest day looks like 10 October (82.1°), the coolest 17 October (22.6°).
54.6°/39.3°
Average high / low
+0.2°
Above normal
3 / 4
Wet days / normal
0.4 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
10 October – 19 October
56°
55.3°
+0.4°
20 October – 29 October
52.2°
51.6°
+0.3°
30 October – 8 November
at normal
45.7°
—
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).
Sun, 1166° / 48°0
66 °
Grenville, Sunday, 11 October
Partly cloudy. High 66°, low 48°.
Pressure29.74 inHg
Wind11.3 mph NE
Humidity73%
Visibility6.2 mi
Dew point54°
Mon, 1256° / 46°0.16
56 °
Grenville, Monday, 12 October
Rain. High 56°, low 46°.
Pressure29.80 inHg
Wind8.2 mph N
Humidity83%
Visibility4.7 mi
Dew point50°
Tue, 1349° / 45°0
49 °
Grenville, Tuesday, 13 October
Overcast. High 49°, low 45°.
Pressure30.09 inHg
Wind10.6 mph NW
Humidity73%
Visibility6.2 mi
Dew point40°
Wed, 1454° / 45°0
54 °
Grenville, Wednesday, 14 October
Mostly clear. High 54°, low 45°.
Pressure30.30 inHg
Wind5 mph N
Humidity63%
Visibility6.2 mi
Dew point38°
Thu, 1556° / 44°0.03
56 °
Grenville, Thursday, 15 October
Light rain. High 56°, low 44°.
Pressure30.33 inHg
Wind7.1 mph W
Humidity65%
Visibility—
Dew point41°
Fri, 1646° / 26°0.07
46 °
Grenville, Friday, 16 October
Light snow. High 46°, low 26°.
Pressure30.24 inHg
Wind30.2 mph NW
Humidity65%
Visibility—
Dew point23°
Sat, 1739° / 23°0
39 °
Grenville, Saturday, 17 October
Clear. High 39°, low 23°.
Pressure30.59 inHg
Wind19.3 mph NW
Humidity39%
Visibility—
Dew point11°
Sun, 1848° / 29°0
48 °
Grenville, Sunday, 18 October
Overcast. High 48°, low 29°.
Pressure30.09 inHg
Wind20.6 mph S
Humidity38%
Visibility—
Dew point19°
Mon, 1964° / 39°0
64 °
Grenville, Monday, 19 October
Partly cloudy. High 64°, low 39°.
Pressure29.97 inHg
Wind12 mph SE
Humidity40%
Visibility—
Dew point33°
Tue, 2060° / 49°0
60 °
Grenville, Tuesday, 20 October
Overcast. High 60°, low 49°.
Pressure29.65 inHg
Wind18.8 mph S
Humidity50%
Visibility—
Dew point39°
Wed, 2147° / 41°0.12
47 °
Grenville, Wednesday, 21 October
Light rain. High 47°, low 41°.
Pressure29.94 inHg
Wind21.1 mph NW
Humidity78%
Visibility—
Dew point37°
Thu, 2256° / 38°0
56 °
Grenville, Thursday, 22 October
Clear. High 56°, low 38°.
Pressure30.03 inHg
Wind22.6 mph NW
Humidity37%
Visibility—
Dew point29°
Fri, 2353° / 33°0
53 °
Grenville, Friday, 23 October
Partly cloudy. High 53°, low 33°.
Pressure30.21 inHg
Wind10.6 mph E
Humidity48%
Visibility—
Dew point28°
Sat, 2453° / 39°0
53 °
Grenville, Saturday, 24 October
Overcast. High 53°, low 39°.
Pressure30.00 inHg
Wind16.2 mph SE
Humidity54%
Visibility—
Dew point34°
Sun, 2544° / 26°0.02
44 °
Grenville, Sunday, 25 October
Light snow. High 44°, low 26°.
Pressure30.42 inHg
Wind20.9 mph N
Humidity71%
Visibility—
Dew point26°
From day 17 onward the outlook is built from 60-year climate statistics
Mon, 2652° / 37°0.04
52 °
Grenville, Monday, 26 October
Climate normal for this date — 60-year average.
Average high52°
Average low37°
Average precipitation0.04 in
Chance of precipitation13%
Record high75° (1989)
Record low12° (2020)
Tue, 2751° / 37°0.06
51 °
Grenville, Tuesday, 27 October
Climate normal for this date — 60-year average.
Average high51°
Average low37°
Average precipitation0.06 in
Chance of precipitation28%
Record high69° (1966)
Record low16° (2020)
Wed, 2849° / 36°0.02
49 °
Grenville, Wednesday, 28 October
Climate normal for this date — 60-year average.
Average high49°
Average low36°
Average precipitation0.02 in
Chance of precipitation17%
Record high68° (2024)
Record low21° (2023)
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)
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.