Monthly outlook for Diamond, SD: average high 59.6°, average low 41.8°. That is 1.8° above the climate normal for October. Precipitation is expected on 3 days (about 0.2 inches), against a normal of 4 days and 1.2 inches. The warmest day looks like 10 October (83.3°), the coolest 17 October (26.2°).
59.6°/41.8°
Average high / low
+1.8°
Above normal
3 / 4
Wet days / normal
0.2 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
9 October – 18 October
60.9°
57.4°
+2°
19 October – 28 October
57.3°
53.6°
+2.1°
29 October – 7 November
at normal
47.6°
—
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).
Sat, 1083° / 54°0
83 °
Diamond, Saturday, 10 October
Clear. High 83°, low 54°.
Pressure29.50 inHg
Wind14.5 mph S
Humidity44%
Visibility6.2 mi
Dew point55°
Sun, 1171° / 51°0
71 °
Diamond, Sunday, 11 October
Overcast. High 71°, low 51°.
Pressure29.71 inHg
Wind7.2 mph N
Humidity71%
Visibility6.2 mi
Dew point57°
Mon, 1257° / 50°0.05
57 °
Diamond, Monday, 12 October
Light rain. High 57°, low 50°.
Pressure29.83 inHg
Wind8.8 mph N
Humidity81%
Visibility6.2 mi
Dew point49°
Tue, 1353° / 46°0.01
53 °
Diamond, Tuesday, 13 October
Light rain. High 53°, low 46°.
Pressure30.12 inHg
Wind10 mph NW
Humidity72%
Visibility6.2 mi
Dew point41°
Wed, 1456° / 44°0
56 °
Diamond, Wednesday, 14 October
Overcast. High 56°, low 44°.
Pressure30.15 inHg
Wind5.6 mph NE
Humidity54%
Visibility—
Dew point37°
Thu, 1567° / 48°0.06
67 °
Diamond, Thursday, 15 October
Light rain. High 67°, low 48°.
Pressure29.77 inHg
Wind23 mph NW
Humidity42%
Visibility—
Dew point42°
Fri, 1645° / 35°0.03
45 °
Diamond, Friday, 16 October
Light snow. High 45°, low 35°.
Pressure30.00 inHg
Wind32.5 mph NW
Humidity48%
Visibility—
Dew point24°
Sat, 1746° / 26°0
46 °
Diamond, Saturday, 17 October
Clear. High 46°, low 26°.
Pressure30.47 inHg
Wind18.2 mph NW
Humidity37%
Visibility—
Dew point15°
Sun, 1856° / 34°0
56 °
Diamond, Sunday, 18 October
Partly cloudy. High 56°, low 34°.
Pressure30.09 inHg
Wind13.5 mph SE
Humidity27%
Visibility—
Dew point17°
Mon, 1962° / 39°0
62 °
Diamond, Monday, 19 October
Clear. High 62°, low 39°.
Pressure30.12 inHg
Wind8.2 mph SE
Humidity36%
Visibility—
Dew point29°
Tue, 2071° / 46°0
71 °
Diamond, Tuesday, 20 October
Overcast. High 71°, low 46°.
Pressure29.94 inHg
Wind17.4 mph S
Humidity34%
Visibility—
Dew point35°
Wed, 2163° / 50°0
63 °
Diamond, Wednesday, 21 October
Partly cloudy. High 63°, low 50°.
Pressure30.09 inHg
Wind12.1 mph NW
Humidity30%
Visibility—
Dew point28°
Thu, 2254° / 41°0.05
54 °
Diamond, Thursday, 22 October
Light rain. High 54°, low 41°.
Pressure29.85 inHg
Wind27.4 mph NW
Humidity45%
Visibility—
Dew point33°
Fri, 2344° / 32°0
44 °
Diamond, Friday, 23 October
Overcast. High 44°, low 32°.
Pressure30.27 inHg
Wind26.1 mph NW
Humidity41%
Visibility—
Dew point19°
Sat, 2449° / 27°0
49 °
Diamond, Saturday, 24 October
Partly cloudy. High 49°, low 27°.
Pressure30.27 inHg
Wind10.5 mph SE
Humidity34%
Visibility—
Dew point15°
From day 17 onward the outlook is built from 60-year climate statistics
Sun, 2553° / 38°0.04
53 °
Diamond, Sunday, 25 October
Climate normal for this date — 60-year average.
Average high53°
Average low38°
Average precipitation0.04 in
Chance of precipitation13%
Record high80° (1989)
Record low19° (2020)
Mon, 2653° / 38°0.04
53 °
Diamond, Monday, 26 October
Climate normal for this date — 60-year average.
Average high53°
Average low38°
Average precipitation0.04 in
Chance of precipitation13%
Record high79° (1989)
Record low12° (2020)
Tue, 2752° / 37°0.07
52 °
Diamond, Tuesday, 27 October
Climate normal for this date — 60-year average.
Average high52°
Average low37°
Average precipitation0.07 in
Chance of precipitation25%
Record high72° (1983)
Record low15° (2020)
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)
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.