Monthly outlook for Stephan, SD: average high 62.8°, average low 45.4°. That is 1.6° above the climate normal for October. Precipitation is expected on 3 days (about 1.5 inches), against a normal of 3 days and 0.9 inches. The warmest day looks like 10 October (87.4°), the coolest 18 October (35.8°).
62.8°/45.4°
Average high / low
+1.6°
Above normal
3 / 3
Wet days / normal
1.5 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
7 October – 16 October
64.6°
60.9°
+2.1°
17 October – 26 October
59.8°
57.1°
+1.5°
27 October – 5 November
at normal
50.7°
—
October records over 66 years
90.1°4 October 1975All-time high
3.6°27 October 2020All-time low
Thu, 0872° / 44°0
72 °
Stephan, Thursday, 8 October
Overcast. High 72°, low 44°.
Pressure30.09 inHg
Wind10.9 mph SE
Humidity38%
Visibility6.2 mi
Dew point38°
Fri, 0982° / 55°0
82 °
Stephan, Friday, 9 October
Mostly clear. High 82°, low 55°.
Pressure29.74 inHg
Wind11 mph S
Humidity72%
Visibility6.2 mi
Dew point62°
Sat, 1087° / 65°0
87 °
Stephan, Saturday, 10 October
Clear. High 87°, low 65°.
Pressure29.50 inHg
Wind13.3 mph S
Humidity38%
Visibility6.2 mi
Dew point50°
Sun, 1168° / 47°0
68 °
Stephan, Sunday, 11 October
Overcast. High 68°, low 47°.
Pressure29.77 inHg
Wind18.6 mph N
Humidity82%
Visibility6.2 mi
Dew point51°
Mon, 1245° / 39°0.03
45 °
Stephan, Monday, 12 October
Light rain. High 45°, low 39°.
Pressure30.18 inHg
Wind15.9 mph NE
Humidity72%
Visibility—
Dew point33°
Tue, 1356° / 39°0
56 °
Stephan, Tuesday, 13 October
Partly cloudy. High 56°, low 39°.
Pressure30.24 inHg
Wind13.9 mph N
Humidity45%
Visibility—
Dew point29°
Wed, 1460° / 49°0.7
60 °
Stephan, Wednesday, 14 October
Heavy rain. High 60°, low 49°.
Pressure29.74 inHg
Wind20.4 mph S
Humidity93%
Visibility—
Dew point48°
Thu, 1563° / 41°0.54
63 °
Stephan, Thursday, 15 October
Rain. High 63°, low 41°.
Pressure29.47 inHg
Wind23.2 mph NW
Humidity93%
Visibility—
Dew point53°
Fri, 1640° / 39°0.18
40 °
Stephan, Friday, 16 October
Light rain. High 40°, low 39°.
Pressure30.00 inHg
Wind23.7 mph NW
Humidity95%
Visibility—
Dew point39°
Sat, 1743° / 38°0.01
43 °
Stephan, Saturday, 17 October
Light rain. High 43°, low 38°.
Pressure30.21 inHg
Wind17.9 mph NW
Humidity87%
Visibility—
Dew point37°
Sun, 1853° / 36°0
53 °
Stephan, Sunday, 18 October
Mostly clear. High 53°, low 36°.
Pressure30.21 inHg
Wind7.7 mph NW
Humidity55%
Visibility—
Dew point32°
Mon, 1964° / 40°0
64 °
Stephan, Monday, 19 October
Clear. High 64°, low 40°.
Pressure30.06 inHg
Wind7.5 mph E
Humidity53%
Visibility—
Dew point39°
Tue, 2071° / 50°0
71 °
Stephan, Tuesday, 20 October
Clear. High 71°, low 50°.
Pressure30.00 inHg
Wind8.7 mph W
Humidity60%
Visibility—
Dew point50°
Wed, 2164° / 48°0
64 °
Stephan, Wednesday, 21 October
Partly cloudy. High 64°, low 48°.
Pressure30.15 inHg
Wind8.9 mph NW
Humidity64%
Visibility—
Dew point47°
Thu, 2264° / 49°0
64 °
Stephan, Thursday, 22 October
Mostly clear. High 64°, low 49°.
Pressure30.15 inHg
Wind5.8 mph SE
Humidity61%
Visibility—
Dew point46°
From day 17 onward the outlook is built from 60-year climate statistics
Fri, 2356° / 39°0.04
56 °
Stephan, Friday, 23 October
Climate normal for this date — 60-year average.
Average high56°
Average low39°
Average precipitation0.04 in
Chance of precipitation17%
Record high77° (1963)
Record low19° (2020)
Sat, 2455° / 38°0.03
55 °
Stephan, Saturday, 24 October
Climate normal for this date — 60-year average.
Average high55°
Average low38°
Average precipitation0.03 in
Chance of precipitation12%
Record high81° (1989)
Record low19° (2020)
Sun, 2556° / 38°0.02
56 °
Stephan, Sunday, 25 October
Climate normal for this date — 60-year average.
Average high56°
Average low38°
Average precipitation0.02 in
Chance of precipitation8%
Record high78° (1989)
Record low14° (2020)
Mon, 2656° / 38°0.02
56 °
Stephan, Monday, 26 October
Climate normal for this date — 60-year average.
Average high56°
Average low38°
Average precipitation0.02 in
Chance of precipitation12%
Record high73° (2014)
Record low9° (2020)
Tue, 2754° / 37°0.05
54 °
Stephan, Tuesday, 27 October
Climate normal for this date — 60-year average.
Average high54°
Average low37°
Average precipitation0.05 in
Chance of precipitation25%
Record high71° (2016)
Record low4° (2020)
Wed, 2853° / 36°0.06
53 °
Stephan, Wednesday, 28 October
Climate normal for this date — 60-year average.
Average high53°
Average low36°
Average precipitation0.06 in
Chance of precipitation15%
Record high74° (2016)
Record low20° (2023)
Thu, 2952° / 36°0.06
52 °
Stephan, Thursday, 29 October
Climate normal for this date — 60-year average.
Average high52°
Average low36°
Average precipitation0.06 in
Chance of precipitation27%
Record high73° (1978)
Record low16° (1991)
Fri, 3051° / 36°0.05
51 °
Stephan, Friday, 30 October
Climate normal for this date — 60-year average.
Average high51°
Average low36°
Average precipitation0.05 in
Chance of precipitation28%
Record high72° (1965)
Record low11° (1991)
Sat, 3151° / 35°0.04
51 °
Stephan, Saturday, 31 October
Climate normal for this date — 60-year average.
Average high51°
Average low35°
Average precipitation0.04 in
Chance of precipitation18%
Record high80° (2016)
Record low16° (1991)
Sun, 0149° / 35°0.03
49 °
Stephan, Sunday, 1 November
Climate normal for this date — 60-year average.
Average high49°
Average low35°
Average precipitation0.03 in
Chance of precipitation17%
Record high74° (1990)
Record low16° (1991)
Mon, 0250° / 34°0.03
50 °
Stephan, Monday, 2 November
Climate normal for this date — 60-year average.
Average high50°
Average low34°
Average precipitation0.03 in
Chance of precipitation15%
Record high72° (1964)
Record low9° (1991)
Tue, 0349° / 34°0.02
49 °
Stephan, Tuesday, 3 November
Climate normal for this date — 60-year average.
Average high49°
Average low34°
Average precipitation0.02 in
Chance of precipitation13%
Record high70° (1978)
Record low6° (1991)
Wed, 0449° / 32°0.01
49 °
Stephan, Wednesday, 4 November
Climate normal for this date — 60-year average.
Average high49°
Average low32°
Average precipitation0.01 in
Chance of precipitation10%
Record high73° (1978)
Record low6° (1991)
Thu, 0549° / 33°0.04
49 °
Stephan, Thursday, 5 November
Climate normal for this date — 60-year average.
Average high49°
Average low33°
Average precipitation0.04 in
Chance of precipitation17%
Record high73° (2001)
Record low13° (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 Stephan, 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 Stephan, 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.