Monthly outlook for Merritt, SD: average high 59.5°, average low 39.7°. That is 1.6° above the climate normal for October. Precipitation is expected on 2 days (about 0.3 inches), against a normal of 3 days and 0.8 inches. The warmest day looks like 20 October (69.9°), the coolest 16 October (22.5°).
59.5°/39.7°
Average high / low
+1.6°
Above normal
2 / 3
Wet days / normal
0.3 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
12 October – 21 October
58.3°
57.6°
+0.4°
22 October – 31 October
61.4°
53.3°
+4.5°
1 November – 10 November
at normal
48.3°
—
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).
Tue, 1342° / 30°0.05
42 °
Merritt, Tuesday, 13 October
Snow. High 42°, low 30°.
Pressure30.03 inHg
Wind3.3 mph E
Humidity90%
Visibility2.5 mi
Dew point40°
Wed, 1454° / 38°0
54 °
Merritt, Wednesday, 14 October
Light rain. High 54°, low 38°.
Pressure30.15 inHg
Wind6.6 mph S
Humidity61%
Visibility6.2 mi
Dew point40°
Thu, 1549° / 35°0
49 °
Merritt, Thursday, 15 October
Overcast. High 49°, low 35°.
Pressure30.45 inHg
Wind14.4 mph N
Humidity46%
Visibility6.2 mi
Dew point18°
Fri, 1661° / 23°0
61 °
Merritt, Friday, 16 October
Clear. High 61°, low 23°.
Pressure30.50 inHg
Wind14.6 mph SW
Humidity28%
Visibility—
Dew point20°
Sat, 1769° / 45°0
69 °
Merritt, Saturday, 17 October
Overcast. High 69°, low 45°.
Pressure29.88 inHg
Wind17.7 mph W
Humidity23%
Visibility—
Dew point27°
Sun, 1866° / 47°0
66 °
Merritt, Sunday, 18 October
Mostly clear. High 66°, low 47°.
Pressure29.83 inHg
Wind9 mph E
Humidity19%
Visibility—
Dew point20°
Mon, 1964° / 44°0
64 °
Merritt, Monday, 19 October
Clear. High 64°, low 44°.
Pressure30.00 inHg
Wind10.3 mph SE
Humidity27%
Visibility—
Dew point26°
Tue, 2070° / 49°0
70 °
Merritt, Tuesday, 20 October
Overcast. High 70°, low 49°.
Pressure29.77 inHg
Wind13.3 mph SW
Humidity21%
Visibility—
Dew point26°
Wed, 2165° / 45°0
65 °
Merritt, Wednesday, 21 October
Overcast. High 65°, low 45°.
Pressure29.83 inHg
Wind9.5 mph SW
Humidity33%
Visibility—
Dew point34°
Thu, 2263° / 40°0
63 °
Merritt, Thursday, 22 October
Mostly clear. High 63°, low 40°.
Pressure30.03 inHg
Wind7.6 mph NE
Humidity37%
Visibility—
Dew point34°
Fri, 2358° / 37°0
58 °
Merritt, Friday, 23 October
Clear. High 58°, low 37°.
Pressure30.27 inHg
Wind17.7 mph S
Humidity29%
Visibility—
Dew point23°
Sat, 2456° / 42°0.21
56 °
Merritt, Saturday, 24 October
Light rain. High 56°, low 42°.
Pressure29.80 inHg
Wind20.6 mph SW
Humidity69%
Visibility—
Dew point46°
Sun, 2557° / 36°0
57 °
Merritt, Sunday, 25 October
Clear. High 57°, low 36°.
Pressure30.21 inHg
Wind16 mph NW
Humidity22%
Visibility—
Dew point14°
Mon, 2666° / 40°0
66 °
Merritt, Monday, 26 October
Clear. High 66°, low 40°.
Pressure30.00 inHg
Wind10.1 mph W
Humidity22%
Visibility—
Dew point24°
Tue, 2768° / 49°0
68 °
Merritt, Tuesday, 27 October
Overcast. High 68°, low 49°.
Pressure29.77 inHg
Wind14.3 mph SW
Humidity11%
Visibility—
Dew point10°
From day 17 onward the outlook is built from 60-year climate statistics
Wed, 2853° / 34°0.07
53 °
Merritt, Wednesday, 28 October
Climate normal for this date — 60-year average.
Average high53°
Average low34°
Average precipitation0.07 in
Chance of precipitation22%
Record high75° (2016)
Record low9° (1991)
Thu, 2951° / 33°0.09
51 °
Merritt, Thursday, 29 October
Climate normal for this date — 60-year average.
Average high51°
Average low33°
Average precipitation0.09 in
Chance of precipitation33%
Record high74° (1968)
Record low2° (1991)
Fri, 3050° / 33°0.04
50 °
Merritt, Friday, 30 October
Climate normal for this date — 60-year average.
Average high50°
Average low33°
Average precipitation0.04 in
Chance of precipitation17%
Record high75° (1968)
Record low-3° (1991)
Sat, 3150° / 32°0.04
50 °
Merritt, Saturday, 31 October
Climate normal for this date — 60-year average.
Average high50°
Average low32°
Average precipitation0.04 in
Chance of precipitation15%
Record high73° (1990)
Record low1° (2002)
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)
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.