Monthly outlook for Thomas, SD: average high 60.2°, average low 44.3°. That is 1.9° above the climate normal for October. Precipitation is expected on 5 days (about 1.9 inches), against a normal of 3 days and 1.1 inches. The warmest day looks like 10 October (79.4°), the coolest 17 October (32.1°).
60.2°/44.3°
Average high / low
+1.9°
Above normal
5 / 3
Wet days / normal
1.9 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
7 October – 16 October
65°
57.9°
+4°
17 October – 26 October
52.1°
53.8°
-1°
27 October – 5 November
at normal
48.3°
—
October records over 66 years
85.5°1 October 2023All-time high
7°26 October 2020All-time low
Climate normals and records are computed from the nearest reference point — Watertown (11 mi).
Thu, 0871° / 43°0
71 °
Thomas, Thursday, 8 October
Partly cloudy. High 71°, low 43°.
Pressure30.09 inHg
Wind5.1 mph S
Humidity42%
Visibility6.2 mi
Dew point39°
Fri, 0974° / 48°0
74 °
Thomas, Friday, 9 October
Clear. High 74°, low 48°.
Pressure29.83 inHg
Wind12 mph SE
Humidity70%
Visibility6.2 mi
Dew point58°
Sat, 1079° / 65°0
79 °
Thomas, Saturday, 10 October
Clear. High 79°, low 65°.
Pressure29.59 inHg
Wind20.6 mph S
Humidity52%
Visibility6.2 mi
Dew point56°
Sun, 1174° / 51°0
74 °
Thomas, Sunday, 11 October
Overcast. High 74°, low 51°.
Pressure29.71 inHg
Wind11.4 mph S
Humidity55%
Visibility6.2 mi
Dew point54°
Mon, 1249° / 43°0.14
49 °
Thomas, Monday, 12 October
Light rain. High 49°, low 43°.
Pressure29.97 inHg
Wind13.1 mph N
Humidity89%
Visibility—
Dew point44°
Tue, 1359° / 41°0
59 °
Thomas, Tuesday, 13 October
Mostly clear. High 59°, low 41°.
Pressure30.06 inHg
Wind13.6 mph SE
Humidity51%
Visibility—
Dew point34°
Wed, 1464° / 54°0.17
64 °
Thomas, Wednesday, 14 October
Light rain. High 64°, low 54°.
Pressure29.56 inHg
Wind18.5 mph S
Humidity94%
Visibility—
Dew point59°
Thu, 1561° / 45°1.1
61 °
Thomas, Thursday, 15 October
Rain. High 61°, low 45°.
Pressure29.83 inHg
Wind25.1 mph NW
Humidity75%
Visibility—
Dew point44°
Fri, 1646° / 36°0
46 °
Thomas, Friday, 16 October
Partly cloudy. High 46°, low 36°.
Pressure30.56 inHg
Wind15.9 mph NW
Humidity58%
Visibility—
Dew point29°
Sat, 1751° / 32°0
51 °
Thomas, Saturday, 17 October
Clear. High 51°, low 32°.
Pressure30.47 inHg
Wind8.5 mph W
Humidity43%
Visibility—
Dew point24°
Sun, 1848° / 37°0.3
48 °
Thomas, Sunday, 18 October
Rain. High 48°, low 37°.
Pressure30.27 inHg
Wind18.7 mph SE
Humidity60%
Visibility—
Dew point32°
Mon, 1951° / 44°0.17
51 °
Thomas, Monday, 19 October
Light rain. High 51°, low 44°.
Pressure30.00 inHg
Wind19.1 mph S
Humidity93%
Visibility—
Dew point45°
Tue, 2058° / 43°0
58 °
Thomas, Tuesday, 20 October
Clear. High 58°, low 43°.
Pressure30.21 inHg
Wind12.7 mph W
Humidity62%
Visibility—
Dew point41°
Wed, 2156° / 45°0.01
56 °
Thomas, Wednesday, 21 October
Light rain. High 56°, low 45°.
Pressure30.18 inHg
Wind11.8 mph NW
Humidity61%
Visibility—
Dew point41°
Thu, 2249° / 38°0
49 °
Thomas, Thursday, 22 October
Overcast. High 49°, low 38°.
Pressure29.97 inHg
Wind9.3 mph N
Humidity54%
Visibility—
Dew point31°
From day 17 onward the outlook is built from 60-year climate statistics
Fri, 2353° / 37°0.07
53 °
Thomas, Friday, 23 October
Climate normal for this date — 60-year average.
Average high53°
Average low37°
Average precipitation0.07 in
Chance of precipitation17%
Record high76° (2022)
Record low13° (2020)
Sat, 2452° / 38°0.04
52 °
Thomas, Saturday, 24 October
Climate normal for this date — 60-year average.
Average high52°
Average low38°
Average precipitation0.04 in
Chance of precipitation17%
Record high77° (1989)
Record low12° (2020)
Sun, 2552° / 38°0.05
52 °
Thomas, Sunday, 25 October
Climate normal for this date — 60-year average.
Average high52°
Average low38°
Average precipitation0.05 in
Chance of precipitation15%
Record high77° (1989)
Record low19° (2020)
Mon, 2653° / 37°0.03
53 °
Thomas, Monday, 26 October
Climate normal for this date — 60-year average.
Average high53°
Average low37°
Average precipitation0.03 in
Chance of precipitation17%
Record high75° (1989)
Record low7° (2020)
Tue, 2752° / 37°0.09
52 °
Thomas, Tuesday, 27 October
Climate normal for this date — 60-year average.
Average high52°
Average low37°
Average precipitation0.09 in
Chance of precipitation33%
Record high70° (1966)
Record low12° (2020)
Wed, 2851° / 36°0.03
51 °
Thomas, Wednesday, 28 October
Climate normal for this date — 60-year average.
Average high51°
Average low36°
Average precipitation0.03 in
Chance of precipitation18%
Record high71° (2024)
Record low22° (1967)
Thu, 2950° / 35°0.07
50 °
Thomas, Thursday, 29 October
Climate normal for this date — 60-year average.
Average high50°
Average low35°
Average precipitation0.07 in
Chance of precipitation25%
Record high68° (2004)
Record low15° (2020)
Fri, 3049° / 36°0.09
49 °
Thomas, Friday, 30 October
Climate normal for this date — 60-year average.
Average high49°
Average low36°
Average precipitation0.09 in
Chance of precipitation23%
Record high66° (1965)
Record low17° (1991)
Sat, 3149° / 34°0.07
49 °
Thomas, Saturday, 31 October
Climate normal for this date — 60-year average.
Average high49°
Average low34°
Average precipitation0.07 in
Chance of precipitation20%
Record high70° (1990)
Record low19° (2002)
Sun, 0147° / 34°0.05
47 °
Thomas, Sunday, 1 November
Climate normal for this date — 60-year average.
Average high47°
Average low34°
Average precipitation0.05 in
Chance of precipitation23%
Record high69° (1990)
Record low15° (1984)
Mon, 0247° / 33°0.04
47 °
Thomas, Monday, 2 November
Climate normal for this date — 60-year average.
Average high47°
Average low33°
Average precipitation0.04 in
Chance of precipitation18%
Record high70° (1978)
Record low9° (1991)
Tue, 0346° / 33°0.04
46 °
Thomas, Tuesday, 3 November
Climate normal for this date — 60-year average.
Average high46°
Average low33°
Average precipitation0.04 in
Chance of precipitation20%
Record high69° (1978)
Record low7° (1991)
Wed, 0446° / 31°0.02
46 °
Thomas, Wednesday, 4 November
Climate normal for this date — 60-year average.
Average high46°
Average low31°
Average precipitation0.02 in
Chance of precipitation10%
Record high69° (2020)
Record low1° (1991)
Thu, 0547° / 33°0.04
47 °
Thomas, Thursday, 5 November
Climate normal for this date — 60-year average.
Average high47°
Average low33°
Average precipitation0.04 in
Chance of precipitation13%
Record high69° (2016)
Record low11° (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 Thomas, 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 Thomas, 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.