Monthly outlook for Ajax, SD: average high 59.6°, average low 42°. That is 0.1° above the climate normal for October. Precipitation is expected on 4 days (about 1.2 inches), against a normal of 3 days and 0.8 inches. The warmest day looks like 20 October (76.2°), the coolest 24 October (29.7°).
59.6°/42°
Average high / low
+0.1°
Above normal
4 / 3
Wet days / normal
1.2 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
11 October – 20 October
62°
60.3°
+1°
21 October – 30 October
55.6°
56.6°
-0.6°
31 October – 9 November
at normal
51°
—
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).
Mon, 1260° / 43°0.19
60 °
Ajax, Monday, 12 October
Rain. High 60°, low 43°.
Pressure29.83 inHg
Wind9.3 mph NE
Humidity81%
Visibility6.2 mi
Dew point50°
Tue, 1350° / 41°0.43
50 °
Ajax, Tuesday, 13 October
Rain. High 50°, low 41°.
Pressure30.09 inHg
Wind2.6 mph E
Humidity74%
Visibility6.2 mi
Dew point39°
Wed, 1451° / 45°0.33
51 °
Ajax, Wednesday, 14 October
Rain. High 51°, low 45°.
Pressure30.21 inHg
Wind3.3 mph SE
Humidity89%
Visibility3.3 mi
Dew point44°
Thu, 1553° / 43°0.16
53 °
Ajax, Thursday, 15 October
Rain. High 53°, low 43°.
Pressure30.39 inHg
Wind21.2 mph N
Humidity45%
Visibility6.2 mi
Dew point26°
Fri, 1661° / 31°0
61 °
Ajax, Friday, 16 October
Clear. High 61°, low 31°.
Pressure30.56 inHg
Wind15 mph S
Humidity37%
Visibility—
Dew point27°
Sat, 1771° / 41°0
71 °
Ajax, Saturday, 17 October
Clear. High 71°, low 41°.
Pressure29.97 inHg
Wind10.2 mph SW
Humidity24%
Visibility—
Dew point26°
Sun, 1873° / 54°0
73 °
Ajax, Sunday, 18 October
Clear. High 73°, low 54°.
Pressure29.94 inHg
Wind10 mph NE
Humidity21%
Visibility—
Dew point28°
Mon, 1969° / 49°0
69 °
Ajax, Monday, 19 October
Clear. High 69°, low 49°.
Pressure30.03 inHg
Wind9.5 mph SE
Humidity32%
Visibility—
Dew point33°
Tue, 2076° / 53°0
76 °
Ajax, Tuesday, 20 October
Overcast. High 76°, low 53°.
Pressure29.59 inHg
Wind20.3 mph SW
Humidity21%
Visibility—
Dew point29°
Wed, 2166° / 45°0
66 °
Ajax, Wednesday, 21 October
Clear. High 66°, low 45°.
Pressure29.85 inHg
Wind14.2 mph SW
Humidity14%
Visibility—
Dew point10°
Thu, 2263° / 49°0
63 °
Ajax, Thursday, 22 October
Overcast. High 63°, low 49°.
Pressure29.85 inHg
Wind21.2 mph N
Humidity19%
Visibility—
Dew point16°
Fri, 2350° / 34°0.01
50 °
Ajax, Friday, 23 October
Light rain. High 50°, low 34°.
Pressure30.30 inHg
Wind20.5 mph N
Humidity38%
Visibility—
Dew point25°
Sat, 2445° / 30°0
45 °
Ajax, Saturday, 24 October
Partly cloudy. High 45°, low 30°.
Pressure30.50 inHg
Wind17.4 mph N
Humidity46%
Visibility—
Dew point20°
Sun, 2564° / 31°0
64 °
Ajax, Sunday, 25 October
Clear. High 64°, low 31°.
Pressure30.03 inHg
Wind21.7 mph N
Humidity8%
Visibility—
Dew point-2°
Mon, 2646° / 33°0
46 °
Ajax, Monday, 26 October
Partly cloudy. High 46°, low 33°.
Pressure30.36 inHg
Wind18.7 mph NW
Humidity25%
Visibility—
Dew point9°
From day 17 onward the outlook is built from 60-year climate statistics
Tue, 2756° / 35°0.03
56 °
Ajax, Tuesday, 27 October
Climate normal for this date — 60-year average.
Average high56°
Average low35°
Average precipitation0.03 in
Chance of precipitation23%
Record high78° (2016)
Record low8° (2020)
Wed, 2856° / 35°0.07
56 °
Ajax, Wednesday, 28 October
Climate normal for this date — 60-year average.
Average high56°
Average low35°
Average precipitation0.07 in
Chance of precipitation22%
Record high78° (2016)
Record low13° (1991)
Thu, 2954° / 35°0.07
54 °
Ajax, Thursday, 29 October
Climate normal for this date — 60-year average.
Average high54°
Average low35°
Average precipitation0.07 in
Chance of precipitation35%
Record high78° (1968)
Record low8° (1991)
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)
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.