Monthly outlook for Merritt, SD: average high 53°, average low 36.2°. That is 1.2° below the climate normal for October. Precipitation is expected on 3 days (about 0.4 inches), against a normal of 3 days and 0.8 inches. The warmest day looks like 20 October (68.9°), the coolest 16 October (24.2°).
53°/36.2°
Average high / low
−1.2°
Below normal
3 / 3
Wet days / normal
0.4 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
16 October – 25 October
58.3°
56.9°
+0.8°
26 October – 4 November
44°
51°
-3.9°
5 November – 14 November
at normal
46.5°
—
October records over 66 years
89.2°3 October 2025All-time high
-6.2°26 October 2020All-time low
Climate normals and records are computed from the nearest reference point — Blackhawk (12 mi).
Sat, 1767° / 36°0
67 °
Merritt, Saturday, 17 October
Clear. High 67°, low 36°.
Pressure30.00 inHg
Wind4.6 mph W
Humidity18%
Visibility6.2 mi
Dew point16°
Sun, 1860° / 41°0
60 °
Merritt, Sunday, 18 October
Clear. High 60°, low 41°.
Pressure30.09 inHg
Wind7.4 mph NE
Humidity35%
Visibility6.2 mi
Dew point30°
Mon, 1961° / 37°0
61 °
Merritt, Monday, 19 October
Clear. High 61°, low 37°.
Pressure30.00 inHg
Wind6.2 mph SE
Humidity33%
Visibility6.2 mi
Dew point31°
Tue, 2069° / 46°0
69 °
Merritt, Tuesday, 20 October
Mostly clear. High 69°, low 46°.
Pressure29.88 inHg
Wind6.8 mph S
Humidity30%
Visibility6.2 mi
Dew point36°
Wed, 2164° / 46°0
64 °
Merritt, Wednesday, 21 October
Clear. High 64°, low 46°.
Pressure30.09 inHg
Wind9.3 mph NW
Humidity35%
Visibility—
Dew point34°
Thu, 2267° / 45°0
67 °
Merritt, Thursday, 22 October
Partly cloudy. High 67°, low 45°.
Pressure30.00 inHg
Wind13.8 mph S
Humidity29%
Visibility—
Dew point31°
Fri, 2362° / 48°0.04
62 °
Merritt, Friday, 23 October
Light rain. High 62°, low 48°.
Pressure29.62 inHg
Wind17.8 mph SW
Humidity51%
Visibility—
Dew point41°
Sat, 2447° / 31°0
47 °
Merritt, Saturday, 24 October
Mostly clear. High 47°, low 31°.
Pressure30.15 inHg
Wind16.2 mph W
Humidity52%
Visibility—
Dew point26°
Sun, 2538° / 30°0
38 °
Merritt, Sunday, 25 October
Overcast. High 38°, low 30°.
Pressure30.24 inHg
Wind7.1 mph NE
Humidity39%
Visibility—
Dew point14°
Mon, 2645° / 27°0.01
45 °
Merritt, Monday, 26 October
Light snow. High 45°, low 27°.
Pressure30.12 inHg
Wind5.1 mph SW
Humidity33%
Visibility—
Dew point14°
Tue, 2757° / 36°0
57 °
Merritt, Tuesday, 27 October
Overcast. High 57°, low 36°.
Pressure29.80 inHg
Wind9 mph SW
Humidity33%
Visibility—
Dew point26°
Wed, 2840° / 37°0.05
40 °
Merritt, Wednesday, 28 October
Light rain. High 40°, low 37°.
Pressure29.74 inHg
Wind5.1 mph SW
Humidity97%
Visibility—
Dew point39°
Thu, 2944° / 35°0.24
44 °
Merritt, Thursday, 29 October
Light rain. High 44°, low 35°.
Pressure29.94 inHg
Wind7.7 mph NW
Humidity93%
Visibility—
Dew point38°
Fri, 3043° / 33°0
43 °
Merritt, Friday, 30 October
Overcast. High 43°, low 33°.
Pressure30.21 inHg
Wind7.7 mph NE
Humidity60%
Visibility—
Dew point29°
Sat, 3134° / 27°0.02
34 °
Merritt, Saturday, 31 October
Snow. High 34°, low 27°.
Pressure30.24 inHg
Wind3.9 mph NE
Humidity95%
Visibility—
Dew point32°
From day 17 onward the outlook is built from 60-year climate statistics
Sun, 0149° / 32°0.06
49 °
Merritt, Sunday, 1 November
Climate normal for this date — 60-year average.
Average high49°
Average low32°
Average precipitation0.06 in
Chance of precipitation17%
Record high72° (2022)
Record low-2° (2002)
Mon, 0249° / 31°0.04
49 °
Merritt, Monday, 2 November
Climate normal for this date — 60-year average.
Average high49°
Average low31°
Average precipitation0.04 in
Chance of precipitation18%
Record high73° (2008)
Record low-3° (1991)
Tue, 0349° / 32°0.04
49 °
Merritt, Tuesday, 3 November
Climate normal for this date — 60-year average.
Average high49°
Average low32°
Average precipitation0.04 in
Chance of precipitation20%
Record high74° (2020)
Record low2° (1991)
Wed, 0451° / 31°0.01
51 °
Merritt, Wednesday, 4 November
Climate normal for this date — 60-year average.
Average high51°
Average low31°
Average precipitation0.01 in
Chance of precipitation8%
Record high73° (1978)
Record low8° (1995)
Thu, 0550° / 31°0.03
50 °
Merritt, Thursday, 5 November
Climate normal for this date — 60-year average.
Average high50°
Average low31°
Average precipitation0.03 in
Chance of precipitation17%
Record high77° (2020)
Record low2° (2003)
Fri, 0649° / 30°0.05
49 °
Merritt, Friday, 6 November
Climate normal for this date — 60-year average.
Average high49°
Average low30°
Average precipitation0.05 in
Chance of precipitation13%
Record high74° (2020)
Record low1° (2003)
Sat, 0749° / 30°0.04
49 °
Merritt, Saturday, 7 November
Climate normal for this date — 60-year average.
Average high49°
Average low30°
Average precipitation0.04 in
Chance of precipitation13%
Record high76° (2020)
Record low5° (1991)
Sun, 0847° / 29°0.07
47 °
Merritt, Sunday, 8 November
Climate normal for this date — 60-year average.
Average high47°
Average low29°
Average precipitation0.07 in
Chance of precipitation18%
Record high76° (1999)
Record low3° (2003)
Mon, 0944° / 28°0.07
44 °
Merritt, Monday, 9 November
Climate normal for this date — 60-year average.
Average high44°
Average low28°
Average precipitation0.07 in
Chance of precipitation23%
Record high69° (2001)
Record low0° (1966)
Tue, 1045° / 26°0.04
45 °
Merritt, Tuesday, 10 November
Climate normal for this date — 60-year average.
Average high45°
Average low26°
Average precipitation0.04 in
Chance of precipitation18%
Record high67° (2005)
Record low-5° (1986)
Wed, 1143° / 26°0.02
43 °
Merritt, Wednesday, 11 November
Climate normal for this date — 60-year average.
Average high43°
Average low26°
Average precipitation0.02 in
Chance of precipitation17%
Record high68° (2005)
Record low-4° (1986)
Thu, 1246° / 27°0.02
46 °
Merritt, Thursday, 12 November
Climate normal for this date — 60-year average.
Average high46°
Average low27°
Average precipitation0.02 in
Chance of precipitation18%
Record high72° (1999)
Record low-11° (1986)
Fri, 1346° / 28°0.04
46 °
Merritt, Friday, 13 November
Climate normal for this date — 60-year average.
Average high46°
Average low28°
Average precipitation0.04 in
Chance of precipitation20%
Record high71° (1999)
Record low-14° (1986)
Sat, 1446° / 29°0.02
46 °
Merritt, Saturday, 14 November
Climate normal for this date — 60-year average.
Average high46°
Average low29°
Average precipitation0.02 in
Chance of precipitation20%
Record high74° (2025)
Record low-4° (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 Merritt, 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 Merritt, 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.