Monthly outlook for Diamond, SD: average high 64.1°, average low 47.3°. That is 5.2° above the climate normal for October. Precipitation is expected on 6 days (about 1.9 inches), against a normal of 4 days and 1.2 inches. The warmest day looks like 21 October (80.4°), the coolest 14 October (41.3°).
64.1°/47.3°
Average high / low
+5.2°
Above normal
6 / 4
Wet days / normal
1.9 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
12 October – 21 October
65.3°
55.8°
+5.3°
22 October – 31 October
62°
51.8°
+5.7°
1 November – 10 November
at normal
45.5°
—
October records over 66 years
89.8°3 October 2025All-time high
12.4°26 October 2020All-time low
Climate normals and records are computed from the nearest reference point — Wheaton (10 mi).
Tue, 1353° / 46°0.08
53 °
Diamond, Tuesday, 13 October
Rain. High 53°, low 46°.
Pressure30.03 inHg
Wind9.3 mph NW
Humidity83%
Visibility2.4 mi
Dew point43°
Wed, 1456° / 41°0
56 °
Diamond, Wednesday, 14 October
Clear. High 56°, low 41°.
Pressure30.27 inHg
Wind2.1 mph NW
Humidity57%
Visibility6.2 mi
Dew point38°
Thu, 1563° / 46°0
63 °
Diamond, Thursday, 15 October
Overcast. High 63°, low 46°.
Pressure30.18 inHg
Wind9.7 mph W
Humidity54%
Visibility6.2 mi
Dew point44°
Fri, 1653° / 43°0
53 °
Diamond, Friday, 16 October
Clear. High 53°, low 43°.
Pressure30.71 inHg
Wind19.1 mph N
Humidity52%
Visibility—
Dew point31°
Sat, 1764° / 44°0
64 °
Diamond, Saturday, 17 October
Partly cloudy. High 64°, low 44°.
Pressure30.06 inHg
Wind16.2 mph S
Humidity39%
Visibility—
Dew point32°
Sun, 1875° / 46°0
75 °
Diamond, Sunday, 18 October
Partly cloudy. High 75°, low 46°.
Pressure29.83 inHg
Wind12.2 mph S
Humidity25%
Visibility—
Dew point29°
Mon, 1973° / 52°0
73 °
Diamond, Monday, 19 October
Mostly clear. High 73°, low 52°.
Pressure30.03 inHg
Wind6.5 mph NE
Humidity31%
Visibility—
Dew point35°
Tue, 2071° / 50°0
71 °
Diamond, Tuesday, 20 October
Clear. High 71°, low 50°.
Pressure30.06 inHg
Wind15.8 mph SE
Humidity52%
Visibility—
Dew point46°
Wed, 2180° / 60°0.31
80 °
Diamond, Wednesday, 21 October
Rain. High 80°, low 60°.
Pressure29.91 inHg
Wind20.3 mph S
Humidity43%
Visibility—
Dew point52°
Thu, 2266° / 55°0.59
66 °
Diamond, Thursday, 22 October
Rain. High 66°, low 55°.
Pressure30.03 inHg
Wind9.3 mph N
Humidity50%
Visibility—
Dew point42°
Fri, 2356° / 46°0
56 °
Diamond, Friday, 23 October
Clear. High 56°, low 46°.
Pressure30.45 inHg
Wind13.3 mph NW
Humidity44%
Visibility—
Dew point31°
Sat, 2460° / 44°0.47
60 °
Diamond, Saturday, 24 October
Rain. High 60°, low 44°.
Pressure29.97 inHg
Wind18.2 mph S
Humidity48%
Visibility—
Dew point38°
Sun, 2557° / 47°0.15
57 °
Diamond, Sunday, 25 October
Light rain. High 57°, low 47°.
Pressure30.06 inHg
Wind20.1 mph N
Humidity50%
Visibility—
Dew point35°
Mon, 2663° / 43°0
63 °
Diamond, Monday, 26 October
Clear. High 63°, low 43°.
Pressure30.15 inHg
Wind8.1 mph S
Humidity32%
Visibility—
Dew point27°
Tue, 2769° / 45°0
69 °
Diamond, Tuesday, 27 October
Clear. High 69°, low 45°.
Pressure29.91 inHg
Wind9.7 mph S
Humidity40%
Visibility—
Dew point36°
From day 17 onward the outlook is built from 60-year climate statistics
Wed, 2851° / 37°0.03
51 °
Diamond, Wednesday, 28 October
Climate normal for this date — 60-year average.
Average high51°
Average low37°
Average precipitation0.03 in
Chance of precipitation12%
Record high72° (2024)
Record low22° (2017)
Thu, 2950° / 36°0.07
50 °
Diamond, Thursday, 29 October
Climate normal for this date — 60-year average.
Average high50°
Average low36°
Average precipitation0.07 in
Chance of precipitation32%
Record high65° (2005)
Record low14° (2020)
Fri, 3049° / 36°0.08
49 °
Diamond, Friday, 30 October
Climate normal for this date — 60-year average.
Average high49°
Average low36°
Average precipitation0.08 in
Chance of precipitation28%
Record high67° (1965)
Record low18° (1991)
Sat, 3149° / 35°0.09
49 °
Diamond, Saturday, 31 October
Climate normal for this date — 60-year average.
Average high49°
Average low35°
Average precipitation0.09 in
Chance of precipitation25%
Record high71° (1999)
Record low19° (1996)
Sun, 0148° / 34°0.07
48 °
Diamond, Sunday, 1 November
Climate normal for this date — 60-year average.
Average high48°
Average low34°
Average precipitation0.07 in
Chance of precipitation23%
Record high72° (1990)
Record low13° (1984)
Mon, 0247° / 34°0.05
47 °
Diamond, Monday, 2 November
Climate normal for this date — 60-year average.
Average high47°
Average low34°
Average precipitation0.05 in
Chance of precipitation20%
Record high72° (2022)
Record low11° (1991)
Tue, 0347° / 33°0.04
47 °
Diamond, Tuesday, 3 November
Climate normal for this date — 60-year average.
Average high47°
Average low33°
Average precipitation0.04 in
Chance of precipitation20%
Record high70° (1978)
Record low8° (1991)
Wed, 0446° / 32°0.03
46 °
Diamond, Wednesday, 4 November
Climate normal for this date — 60-year average.
Average high46°
Average low32°
Average precipitation0.03 in
Chance of precipitation12%
Record high70° (2015)
Record low0° (1991)
Thu, 0547° / 32°0.03
47 °
Diamond, Thursday, 5 November
Climate normal for this date — 60-year average.
Average high47°
Average low32°
Average precipitation0.03 in
Chance of precipitation15%
Record high69° (1975)
Record low12° (1991)
Fri, 0646° / 32°0.04
46 °
Diamond, Friday, 6 November
Climate normal for this date — 60-year average.
Average high46°
Average low32°
Average precipitation0.04 in
Chance of precipitation17%
Record high73° (2020)
Record low4° (1991)
Sat, 0746° / 31°0.04
46 °
Diamond, Saturday, 7 November
Climate normal for this date — 60-year average.
Average high46°
Average low31°
Average precipitation0.04 in
Chance of precipitation17%
Record high69° (2020)
Record low1° (1991)
Sun, 0845° / 31°0.05
45 °
Diamond, Sunday, 8 November
Climate normal for this date — 60-year average.
Average high45°
Average low31°
Average precipitation0.05 in
Chance of precipitation20%
Record high73° (1999)
Record low7° (2003)
Mon, 0942° / 29°0.08
42 °
Diamond, Monday, 9 November
Climate normal for this date — 60-year average.
Average high42°
Average low29°
Average precipitation0.08 in
Chance of precipitation22%
Record high63° (2010)
Record low13° (2018)
Tue, 1040° / 28°0.09
40 °
Diamond, Tuesday, 10 November
Climate normal for this date — 60-year average.
Average high40°
Average low28°
Average precipitation0.09 in
Chance of precipitation27%
Record high62° (2015)
Record low7° (1979)
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 Diamond, 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 Diamond, 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.