Monthly outlook for Ajax, SD: average high 61.5°, average low 42.6°. That is 2.5° above the climate normal for October. Precipitation is expected on 1 day (about 0.0 inches), against a normal of 3 days and 0.7 inches. The warmest day looks like 17 October (77.4°), the coolest 25 October (34°).
61.5°/42.6°
Average high / low
+2.5°
Above normal
1 / 3
Wet days / normal
0.0 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
17 October – 26 October
64.5°
59°
+3.1°
27 October – 5 November
56.3°
52.9°
+1.9°
6 November – 15 November
at normal
48.3°
—
October records over 66 years
90.3°3 October 2025All-time high
-4.2°26 October 2020All-time low
Climate normals and records are computed from the nearest reference point — Hermosa (4 mi).
Sun, 1866° / 49°0
66 °
Ajax, Sunday, 18 October
Clear. High 66°, low 49°.
Pressure30.06 inHg
Wind13.5 mph N
Humidity33%
Visibility6.2 mi
Dew point35°
Mon, 1960° / 42°0
60 °
Ajax, Monday, 19 October
Clear. High 60°, low 42°.
Pressure30.12 inHg
Wind5.5 mph SE
Humidity58%
Visibility6.2 mi
Dew point42°
Tue, 2075° / 45°0
75 °
Ajax, Tuesday, 20 October
Clear. High 75°, low 45°.
Pressure29.94 inHg
Wind9.3 mph SE
Humidity43%
Visibility6.2 mi
Dew point44°
Wed, 2166° / 47°0
66 °
Ajax, Wednesday, 21 October
Clear. High 66°, low 47°.
Pressure30.15 inHg
Wind7.8 mph NW
Humidity57%
Visibility—
Dew point46°
Thu, 2272° / 50°0
72 °
Ajax, Thursday, 22 October
Overcast. High 72°, low 50°.
Pressure29.94 inHg
Wind14.9 mph S
Humidity54%
Visibility—
Dew point50°
Fri, 2373° / 58°0
73 °
Ajax, Friday, 23 October
Partly cloudy. High 73°, low 58°.
Pressure29.47 inHg
Wind25.4 mph SW
Humidity22%
Visibility—
Dew point30°
Sat, 2450° / 37°0
50 °
Ajax, Saturday, 24 October
Clear. High 50°, low 37°.
Pressure30.06 inHg
Wind20.1 mph NW
Humidity41%
Visibility—
Dew point26°
Sun, 2547° / 34°0
47 °
Ajax, Sunday, 25 October
Overcast. High 47°, low 34°.
Pressure30.33 inHg
Wind16.4 mph N
Humidity36%
Visibility—
Dew point17°
Mon, 2659° / 35°0
59 °
Ajax, Monday, 26 October
Overcast. High 59°, low 35°.
Pressure30.00 inHg
Wind16.3 mph S
Humidity32%
Visibility—
Dew point23°
Tue, 2767° / 45°0
67 °
Ajax, Tuesday, 27 October
Overcast. High 67°, low 45°.
Pressure29.65 inHg
Wind15.8 mph SW
Humidity21%
Visibility—
Dew point22°
Wed, 2851° / 39°0.05
51 °
Ajax, Wednesday, 28 October
Light rain. High 51°, low 39°.
Pressure29.80 inHg
Wind24.9 mph NW
Humidity79%
Visibility—
Dew point38°
Thu, 2971° / 39°0
71 °
Ajax, Thursday, 29 October
Mostly clear. High 71°, low 39°.
Pressure29.77 inHg
Wind18.5 mph SW
Humidity12%
Visibility—
Dew point12°
Fri, 3052° / 43°0
52 °
Ajax, Friday, 30 October
Overcast. High 52°, low 43°.
Pressure29.59 inHg
Wind16.5 mph N
Humidity32%
Visibility—
Dew point22°
Sat, 3144° / 39°0
44 °
Ajax, Saturday, 31 October
Overcast. High 44°, low 39°.
Pressure29.71 inHg
Wind32.6 mph NW
Humidity45%
Visibility—
Dew point23°
Sun, 0154° / 35°0
54 °
Ajax, Sunday, 1 November
Clear. High 54°, low 35°.
Pressure29.94 inHg
Wind18.7 mph NW
Humidity20%
Visibility—
Dew point9°
From day 17 onward the outlook is built from 60-year climate statistics
Mon, 0251° / 32°0.04
51 °
Ajax, Monday, 2 November
Climate normal for this date — 60-year average.
Average high51°
Average low32°
Average precipitation0.04 in
Chance of precipitation20%
Record high75° (2008)
Record low-2° (1991)
Tue, 0351° / 33°0.04
51 °
Ajax, Tuesday, 3 November
Climate normal for this date — 60-year average.
Average high51°
Average low33°
Average precipitation0.04 in
Chance of precipitation20%
Record high71° (2020)
Record low2° (1991)
Wed, 0453° / 32°0.01
53 °
Ajax, Wednesday, 4 November
Climate normal for this date — 60-year average.
Average high53°
Average low32°
Average precipitation0.01 in
Chance of precipitation10%
Record high76° (1978)
Record low7° (1995)
Thu, 0552° / 33°0.03
52 °
Ajax, Thursday, 5 November
Climate normal for this date — 60-year average.
Average high52°
Average low33°
Average precipitation0.03 in
Chance of precipitation13%
Record high76° (2020)
Record low1° (2003)
Fri, 0651° / 32°0.04
51 °
Ajax, Friday, 6 November
Climate normal for this date — 60-year average.
Average high51°
Average low32°
Average precipitation0.04 in
Chance of precipitation13%
Record high75° (2020)
Record low-3° (2003)
Sat, 0752° / 32°0.03
52 °
Ajax, Saturday, 7 November
Climate normal for this date — 60-year average.
Average high52°
Average low32°
Average precipitation0.03 in
Chance of precipitation13%
Record high75° (1999)
Record low3° (1991)
Sun, 0850° / 31°0.06
50 °
Ajax, Sunday, 8 November
Climate normal for this date — 60-year average.
Average high50°
Average low31°
Average precipitation0.06 in
Chance of precipitation20%
Record high77° (1999)
Record low3° (2003)
Mon, 0946° / 29°0.06
46 °
Ajax, Monday, 9 November
Climate normal for this date — 60-year average.
Average high46°
Average low29°
Average precipitation0.06 in
Chance of precipitation25%
Record high74° (2016)
Record low-3° (1966)
Tue, 1047° / 27°0.04
47 °
Ajax, Tuesday, 10 November
Climate normal for this date — 60-year average.
Average high47°
Average low27°
Average precipitation0.04 in
Chance of precipitation17%
Record high69° (2005)
Record low-7° (1986)
Wed, 1145° / 27°0.02
45 °
Ajax, Wednesday, 11 November
Climate normal for this date — 60-year average.
Average high45°
Average low27°
Average precipitation0.02 in
Chance of precipitation18%
Record high72° (2005)
Record low-7° (1986)
Thu, 1248° / 28°0.03
48 °
Ajax, Thursday, 12 November
Climate normal for this date — 60-year average.
Average high48°
Average low28°
Average precipitation0.03 in
Chance of precipitation15%
Record high73° (1999)
Record low-8° (1986)
Fri, 1348° / 29°0.04
48 °
Ajax, Friday, 13 November
Climate normal for this date — 60-year average.
Average high48°
Average low29°
Average precipitation0.04 in
Chance of precipitation22%
Record high73° (1999)
Record low-16° (1986)
Sat, 1448° / 30°0.02
48 °
Ajax, Saturday, 14 November
Climate normal for this date — 60-year average.
Average high48°
Average low30°
Average precipitation0.02 in
Chance of precipitation13%
Record high74° (2025)
Record low1° (1978)
Sun, 1548° / 29°0.02
48 °
Ajax, Sunday, 15 November
Climate normal for this date — 60-year average.
Average high48°
Average low29°
Average precipitation0.02 in
Chance of precipitation13%
Record high71° (2021)
Record low1° (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 Ajax, 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 Ajax, 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.