Monthly outlook for Ajax, SD: average high 63.8°, average low 42.6°. That is 3.1° above the climate normal for October. Precipitation is expected on 2 days (about 0.2 inches), against a normal of 3 days and 0.7 inches. The warmest day looks like 22 October (74.8°), the coolest 16 October (29.9°).
63.8°/42.6°
Average high / low
+3.1°
Above normal
2 / 3
Wet days / normal
0.2 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
14 October – 23 October
62.7°
59.5°
+1.8°
24 October – 2 November
65.7°
54.6°
+6.2°
3 November – 12 November
at normal
49.5°
—
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).
Thu, 1549° / 37°0.03
49 °
Ajax, Thursday, 15 October
Light rain. High 49°, low 37°.
Pressure30.36 inHg
Wind20.7 mph NW
Humidity40%
Visibility6.2 mi
Dew point22°
Fri, 1654° / 30°0
54 °
Ajax, Friday, 16 October
Clear. High 54°, low 30°.
Pressure30.71 inHg
Wind6.8 mph S
Humidity44%
Visibility6.2 mi
Dew point13°
Sat, 1772° / 44°0
72 °
Ajax, Saturday, 17 October
Clear. High 72°, low 44°.
Pressure30.03 inHg
Wind4 mph SE
Humidity24%
Visibility6.2 mi
Dew point30°
Sun, 1863° / 49°0
63 °
Ajax, Sunday, 18 October
Clear. High 63°, low 49°.
Pressure30.21 inHg
Wind11.3 mph N
Humidity36%
Visibility6.2 mi
Dew point35°
Mon, 1963° / 38°0
63 °
Ajax, Monday, 19 October
Clear. High 63°, low 38°.
Pressure30.12 inHg
Wind10.4 mph SE
Humidity48%
Visibility—
Dew point37°
Tue, 2074° / 44°0
74 °
Ajax, Tuesday, 20 October
Clear. High 74°, low 44°.
Pressure29.83 inHg
Wind17.2 mph S
Humidity32%
Visibility—
Dew point35°
Wed, 2164° / 50°0
64 °
Ajax, Wednesday, 21 October
Mostly clear. High 64°, low 50°.
Pressure29.94 inHg
Wind10.5 mph N
Humidity33%
Visibility—
Dew point32°
Thu, 2275° / 47°0
75 °
Ajax, Thursday, 22 October
Clear. High 75°, low 47°.
Pressure29.85 inHg
Wind16.8 mph S
Humidity28%
Visibility—
Dew point34°
Fri, 2359° / 41°0.08
59 °
Ajax, Friday, 23 October
Light rain. High 59°, low 41°.
Pressure29.74 inHg
Wind37.3 mph NW
Humidity51%
Visibility—
Dew point36°
Sat, 2450° / 35°0
50 °
Ajax, Saturday, 24 October
Partly cloudy. High 50°, low 35°.
Pressure30.27 inHg
Wind25.2 mph NW
Humidity19%
Visibility—
Dew point7°
Sun, 2557° / 32°0
57 °
Ajax, Sunday, 25 October
Clear. High 57°, low 32°.
Pressure30.39 inHg
Wind11.4 mph NW
Humidity20%
Visibility—
Dew point11°
Mon, 2673° / 42°0
73 °
Ajax, Monday, 26 October
Clear. High 73°, low 42°.
Pressure29.97 inHg
Wind9.8 mph W
Humidity14%
Visibility—
Dew point16°
Tue, 2771° / 49°0
71 °
Ajax, Tuesday, 27 October
Clear. High 71°, low 49°.
Pressure29.83 inHg
Wind9.6 mph SE
Humidity16%
Visibility—
Dew point19°
Wed, 2870° / 52°0
70 °
Ajax, Wednesday, 28 October
Overcast. High 70°, low 52°.
Pressure29.74 inHg
Wind15.2 mph NW
Humidity25%
Visibility—
Dew point31°
Thu, 2972° / 49°0
72 °
Ajax, Thursday, 29 October
Mostly clear. High 72°, low 49°.
Pressure29.88 inHg
Wind12.4 mph SE
Humidity29%
Visibility—
Dew point31°
From day 17 onward the outlook is built from 60-year climate statistics
Fri, 3052° / 34°0.04
52 °
Ajax, Friday, 30 October
Climate normal for this date — 60-year average.
Average high52°
Average low34°
Average precipitation0.04 in
Chance of precipitation22%
Record high77° (1968)
Record low3° (1991)
Sat, 3152° / 34°0.03
52 °
Ajax, Saturday, 31 October
Climate normal for this date — 60-year average.
Average high52°
Average low34°
Average precipitation0.03 in
Chance of precipitation15%
Record high74° (1990)
Record low3° (1991)
Sun, 0151° / 33°0.05
51 °
Ajax, Sunday, 1 November
Climate normal for this date — 60-year average.
Average high51°
Average low33°
Average precipitation0.05 in
Chance of precipitation18%
Record high72° (1965)
Record low3° (2002)
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)
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.