Monthly outlook for Rousseau, SD: average high 63.3°, average low 45°. That is 3.6° above the climate normal for October. Precipitation is expected on 4 days (about 1.9 inches), against a normal of 3 days and 0.7 inches. The warmest day looks like 23 October (77.2°), the coolest 25 October (39.4°).
63.3°/45°
Average high / low
+3.6°
Above normal
4 / 3
Wet days / normal
1.9 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
16 October – 25 October
65.6°
58.5°
+4°
26 October – 4 November
59.3°
52.6°
+3.7°
5 November – 14 November
at normal
46.8°
—
October records over 66 years
91°3 October 2025All-time high
1°27 October 2020All-time low
Climate normals and records are computed from the nearest reference point — Canning (6 mi).
Sat, 1771° / 42°0
71 °
Rousseau, Saturday, 17 October
Clear. High 71°, low 42°.
Pressure30.15 inHg
Wind8.6 mph S
Humidity39%
Visibility6.2 mi
Dew point33°
Sun, 1870° / 44°0
70 °
Rousseau, Sunday, 18 October
Clear. High 70°, low 44°.
Pressure30.00 inHg
Wind4.6 mph NE
Humidity51%
Visibility6.2 mi
Dew point43°
Mon, 1964° / 45°0
64 °
Rousseau, Monday, 19 October
Clear. High 64°, low 45°.
Pressure30.15 inHg
Wind7 mph E
Humidity66%
Visibility6.2 mi
Dew point45°
Tue, 2069° / 48°0
69 °
Rousseau, Tuesday, 20 October
Clear. High 69°, low 48°.
Pressure30.06 inHg
Wind10.5 mph SE
Humidity74%
Visibility6.2 mi
Dew point51°
Wed, 2170° / 50°0
70 °
Rousseau, Wednesday, 21 October
Clear. High 70°, low 50°.
Pressure30.12 inHg
Wind7.5 mph N
Humidity66%
Visibility—
Dew point53°
Thu, 2275° / 49°0
75 °
Rousseau, Thursday, 22 October
Partly cloudy. High 75°, low 49°.
Pressure30.12 inHg
Wind14.3 mph SE
Humidity64%
Visibility—
Dew point52°
Fri, 2377° / 57°0.39
77 °
Rousseau, Friday, 23 October
Rain. High 77°, low 57°.
Pressure29.65 inHg
Wind21 mph W
Humidity70%
Visibility—
Dew point60°
Sat, 2456° / 45°0
56 °
Rousseau, Saturday, 24 October
Overcast. High 56°, low 45°.
Pressure30.33 inHg
Wind27.7 mph W
Humidity48%
Visibility—
Dew point32°
Sun, 2551° / 39°0.15
51 °
Rousseau, Sunday, 25 October
Light rain. High 51°, low 39°.
Pressure30.45 inHg
Wind11.1 mph SE
Humidity40%
Visibility—
Dew point26°
Mon, 2663° / 43°0.05
63 °
Rousseau, Monday, 26 October
Light rain. High 63°, low 43°.
Pressure30.00 inHg
Wind15.4 mph W
Humidity62%
Visibility—
Dew point43°
Tue, 2758° / 42°0
58 °
Rousseau, Tuesday, 27 October
Clear. High 58°, low 42°.
Pressure30.21 inHg
Wind5.4 mph W
Humidity50%
Visibility—
Dew point34°
Wed, 2866° / 44°0
66 °
Rousseau, Wednesday, 28 October
Mostly clear. High 66°, low 44°.
Pressure30.03 inHg
Wind12.8 mph SE
Humidity50%
Visibility—
Dew point40°
Thu, 2955° / 45°1.28
55 °
Rousseau, Thursday, 29 October
Rain. High 55°, low 45°.
Pressure29.68 inHg
Wind18.4 mph E
Humidity90%
Visibility—
Dew point45°
Fri, 3051° / 42°0
51 °
Rousseau, Friday, 30 October
Overcast. High 51°, low 42°.
Pressure30.09 inHg
Wind13.1 mph N
Humidity69%
Visibility—
Dew point40°
Sat, 3162° / 45°0
62 °
Rousseau, Saturday, 31 October
Clear. High 62°, low 45°.
Pressure30.18 inHg
Wind10 mph W
Humidity52%
Visibility—
Dew point38°
From day 17 onward the outlook is built from 60-year climate statistics
Sun, 0150° / 36°0.02
50 °
Rousseau, Sunday, 1 November
Climate normal for this date — 60-year average.
Average high50°
Average low36°
Average precipitation0.02 in
Chance of precipitation15%
Record high74° (1990)
Record low16° (1991)
Mon, 0251° / 35°0.02
51 °
Rousseau, Monday, 2 November
Climate normal for this date — 60-year average.
Average high51°
Average low35°
Average precipitation0.02 in
Chance of precipitation17%
Record high73° (2022)
Record low9° (1991)
Tue, 0350° / 35°0.02
50 °
Rousseau, Tuesday, 3 November
Climate normal for this date — 60-year average.
Average high50°
Average low35°
Average precipitation0.02 in
Chance of precipitation17%
Record high71° (1978)
Record low6° (1991)
Wed, 0450° / 33°0.01
50 °
Rousseau, Wednesday, 4 November
Climate normal for this date — 60-year average.
Average high50°
Average low33°
Average precipitation0.01 in
Chance of precipitation8%
Record high76° (1978)
Record low6° (1991)
Thu, 0551° / 34°0.04
51 °
Rousseau, Thursday, 5 November
Climate normal for this date — 60-year average.
Average high51°
Average low34°
Average precipitation0.04 in
Chance of precipitation15%
Record high74° (2001)
Record low14° (2003)
Fri, 0650° / 32°0.02
50 °
Rousseau, Friday, 6 November
Climate normal for this date — 60-year average.
Average high50°
Average low32°
Average precipitation0.02 in
Chance of precipitation15%
Record high74° (2020)
Record low4° (2003)
Sat, 0750° / 32°0.04
50 °
Rousseau, Saturday, 7 November
Climate normal for this date — 60-year average.
Average high50°
Average low32°
Average precipitation0.04 in
Chance of precipitation13%
Record high71° (2006)
Record low1° (1971)
Sun, 0849° / 32°0.07
49 °
Rousseau, Sunday, 8 November
Climate normal for this date — 60-year average.
Average high49°
Average low32°
Average precipitation0.07 in
Chance of precipitation17%
Record high78° (1999)
Record low10° (1991)
Mon, 0946° / 31°0.04
46 °
Rousseau, Monday, 9 November
Climate normal for this date — 60-year average.
Average high46°
Average low31°
Average precipitation0.04 in
Chance of precipitation22%
Record high67° (2016)
Record low10° (1966)
Tue, 1044° / 28°0.05
44 °
Rousseau, Tuesday, 10 November
Climate normal for this date — 60-year average.
Average high44°
Average low28°
Average precipitation0.05 in
Chance of precipitation23%
Record high67° (1989)
Record low2° (1986)
Wed, 1143° / 28°0.02
43 °
Rousseau, Wednesday, 11 November
Climate normal for this date — 60-year average.
Average high43°
Average low28°
Average precipitation0.02 in
Chance of precipitation13%
Record high66° (2005)
Record low-1° (1986)
Thu, 1244° / 28°0.05
44 °
Rousseau, Thursday, 12 November
Climate normal for this date — 60-year average.
Average high44°
Average low28°
Average precipitation0.05 in
Chance of precipitation17%
Record high68° (1999)
Record low0° (1986)
Fri, 1346° / 29°0.03
46 °
Rousseau, Friday, 13 November
Climate normal for this date — 60-year average.
Average high46°
Average low29°
Average precipitation0.03 in
Chance of precipitation17%
Record high70° (1981)
Record low-10° (1986)
Sat, 1445° / 30°0.02
45 °
Rousseau, Saturday, 14 November
Climate normal for this date — 60-year average.
Average high45°
Average low30°
Average precipitation0.02 in
Chance of precipitation10%
Record high67° (2025)
Record low-5° (2014)
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 Rousseau, 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 Rousseau, 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.