Monthly outlook for Ethan, SD: average high 66.2°, average low 49°. That is 2.6° above the climate normal for October. Precipitation is expected on 5 days (about 2.9 inches), against a normal of 3 days and 1.1 inches. The warmest day looks like 10 October (87°), the coolest 17 October (37.2°).
66.2°/49°
Average high / low
+2.6°
Above normal
5 / 3
Wet days / normal
2.9 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
7 October – 16 October
70.7°
62.6°
+4.5°
17 October – 26 October
58.7°
58.6°
+0.1°
27 October – 5 November
at normal
52.7°
—
October records over 66 years
92.5°3 October 2025All-time high
7.2°27 October 2020All-time low
Thu, 0879° / 49°0
79 °
Ethan, Thursday, 8 October
Overcast. High 79°, low 49°.
Pressure30.06 inHg
Wind9.9 mph SE
Humidity40%
Visibility6.2 mi
Dew point45°
Fri, 0985° / 55°0
85 °
Ethan, Friday, 9 October
Clear. High 85°, low 55°.
Pressure29.83 inHg
Wind9.2 mph SE
Humidity63%
Visibility6.2 mi
Dew point60°
Sat, 1087° / 69°0
87 °
Ethan, Saturday, 10 October
Clear. High 87°, low 69°.
Pressure29.62 inHg
Wind20.5 mph S
Humidity38%
Visibility6.2 mi
Dew point52°
Sun, 1181° / 56°0
81 °
Ethan, Sunday, 11 October
Overcast. High 81°, low 56°.
Pressure29.68 inHg
Wind13.2 mph S
Humidity36%
Visibility6.2 mi
Dew point50°
Mon, 1254° / 47°0.01
54 °
Ethan, Monday, 12 October
Light rain. High 54°, low 47°.
Pressure29.94 inHg
Wind15.1 mph N
Humidity69%
Visibility—
Dew point43°
Tue, 1364° / 43°0
64 °
Ethan, Tuesday, 13 October
Partly cloudy. High 64°, low 43°.
Pressure30.06 inHg
Wind13.8 mph SE
Humidity48%
Visibility—
Dew point36°
Wed, 1469° / 57°0.8
69 °
Ethan, Wednesday, 14 October
Rain. High 69°, low 57°.
Pressure29.56 inHg
Wind17.1 mph S
Humidity84%
Visibility—
Dew point63°
Thu, 1562° / 48°1.54
62 °
Ethan, Thursday, 15 October
Heavy rain. High 62°, low 48°.
Pressure29.88 inHg
Wind25.7 mph NW
Humidity65%
Visibility—
Dew point43°
Fri, 1651° / 42°0
51 °
Ethan, Friday, 16 October
Partly cloudy. High 51°, low 42°.
Pressure30.59 inHg
Wind14.1 mph NW
Humidity51%
Visibility—
Dew point31°
Sat, 1754° / 37°0
54 °
Ethan, Saturday, 17 October
Clear. High 54°, low 37°.
Pressure30.50 inHg
Wind6.4 mph SE
Humidity48%
Visibility—
Dew point30°
Sun, 1852° / 45°0.39
52 °
Ethan, Sunday, 18 October
Rain. High 52°, low 45°.
Pressure30.21 inHg
Wind18.2 mph SE
Humidity58%
Visibility—
Dew point36°
Mon, 1968° / 49°0.11
68 °
Ethan, Monday, 19 October
Light rain. High 68°, low 49°.
Pressure29.97 inHg
Wind17.5 mph SE
Humidity77%
Visibility—
Dew point51°
Tue, 2063° / 47°0
63 °
Ethan, Tuesday, 20 October
Clear. High 63°, low 47°.
Pressure30.21 inHg
Wind10 mph NW
Humidity51%
Visibility—
Dew point41°
Wed, 2161° / 47°0
61 °
Ethan, Wednesday, 21 October
Clear. High 61°, low 47°.
Pressure30.21 inHg
Wind10.6 mph NW
Humidity52%
Visibility—
Dew point41°
Thu, 2254° / 43°0.06
54 °
Ethan, Thursday, 22 October
Light rain. High 54°, low 43°.
Pressure29.94 inHg
Wind13 mph NE
Humidity66%
Visibility—
Dew point40°
From day 17 onward the outlook is built from 60-year climate statistics
Fri, 2358° / 40°0.09
58 °
Ethan, Friday, 23 October
Climate normal for this date — 60-year average.
Average high58°
Average low40°
Average precipitation0.09 in
Chance of precipitation22%
Record high83° (2022)
Record low21° (1981)
Sat, 2456° / 40°0.04
56 °
Ethan, Saturday, 24 October
Climate normal for this date — 60-year average.
Average high56°
Average low40°
Average precipitation0.04 in
Chance of precipitation17%
Record high82° (1989)
Record low20° (2020)
Sun, 2557° / 40°0.04
57 °
Ethan, Sunday, 25 October
Climate normal for this date — 60-year average.
Average high57°
Average low40°
Average precipitation0.04 in
Chance of precipitation20%
Record high80° (1989)
Record low21° (2020)
Mon, 2657° / 39°0.02
57 °
Ethan, Monday, 26 October
Climate normal for this date — 60-year average.
Average high57°
Average low39°
Average precipitation0.02 in
Chance of precipitation18%
Record high78° (1989)
Record low13° (2020)
Tue, 2756° / 39°0.06
56 °
Ethan, Tuesday, 27 October
Climate normal for this date — 60-year average.
Average high56°
Average low39°
Average precipitation0.06 in
Chance of precipitation33%
Record high76° (1999)
Record low7° (2020)
Wed, 2855° / 38°0.03
55 °
Ethan, Wednesday, 28 October
Climate normal for this date — 60-year average.
Average high55°
Average low38°
Average precipitation0.03 in
Chance of precipitation15%
Record high76° (2016)
Record low17° (2017)
Thu, 2954° / 38°0.07
54 °
Ethan, Thursday, 29 October
Climate normal for this date — 60-year average.
Average high54°
Average low38°
Average precipitation0.07 in
Chance of precipitation20%
Record high72° (1978)
Record low20° (1991)
Fri, 3053° / 37°0.12
53 °
Ethan, Friday, 30 October
Climate normal for this date — 60-year average.
Average high53°
Average low37°
Average precipitation0.12 in
Chance of precipitation30%
Record high74° (1965)
Record low16° (1991)
Sat, 3153° / 35°0.06
53 °
Ethan, Saturday, 31 October
Climate normal for this date — 60-year average.
Average high53°
Average low35°
Average precipitation0.06 in
Chance of precipitation18%
Record high77° (2016)
Record low11° (2002)
Sun, 0152° / 36°0.04
52 °
Ethan, Sunday, 1 November
Climate normal for this date — 60-year average.
Average high52°
Average low36°
Average precipitation0.04 in
Chance of precipitation15%
Record high73° (1990)
Record low14° (2002)
Mon, 0251° / 35°0.04
51 °
Ethan, Monday, 2 November
Climate normal for this date — 60-year average.
Average high51°
Average low35°
Average precipitation0.04 in
Chance of precipitation13%
Record high75° (2005)
Record low11° (1991)
Tue, 0351° / 35°0.04
51 °
Ethan, Tuesday, 3 November
Climate normal for this date — 60-year average.
Average high51°
Average low35°
Average precipitation0.04 in
Chance of precipitation15%
Record high75° (1978)
Record low6° (1991)
Wed, 0451° / 33°0.01
51 °
Ethan, Wednesday, 4 November
Climate normal for this date — 60-year average.
Average high51°
Average low33°
Average precipitation0.01 in
Chance of precipitation7%
Record high74° (2020)
Record low-10° (1991)
Thu, 0551° / 34°0.03
51 °
Ethan, Thursday, 5 November
Climate normal for this date — 60-year average.
Average high51°
Average low34°
Average precipitation0.03 in
Chance of precipitation17%
Record high75° (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 Ethan, 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 Ethan, 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.