As of 03:10 MDT

Weather in Ajax, SD

39°Current weather

Ajax, Tuesday, 13 October, 03:10

Rain. Feels like 34°. High 48°, low 39°.

Pressure30.00 inHg
Wind6.9 mph W
Humidity93%
Visibility3.2 mi
Dew point37°

Monthly outlook for Ajax, SD: average high 58.5°, average low 41.5°. That is 0.1° below the climate normal for October. Precipitation is expected on 4 days (about 1.0 inches), against a normal of 3 days and 0.7 inches. The warmest day looks like 20 October (76.6°), the coolest 16 October (30.9°).

58.5°/41.5°
Average high / low
−0.1°
Below normal
4 / 3
Wet days / normal
1.0 in
Precipitation this month

Ten-day blocks vs climate normal

PeriodForecast highNormalDifference
13 October – 22 October60.7°59.8°+0.5°
23 October – 1 November54.7°55.1°-0.2°
2 November – 11 Novemberat normal49.9°—

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).

Wed, 1450° / 42°0.28Rain
50 °Rain

Ajax, Wednesday, 14 October

Rain. High 50°, low 42°.

Pressure30.21 inHg
Wind4.3 mph SE
Humidity59%
Visibility6.2 mi
Dew point37°
Thu, 1557° / 41°0.16Rain
57 °Rain

Ajax, Thursday, 15 October

Rain. High 57°, low 41°.

Pressure30.39 inHg
Wind21.7 mph N
Humidity37%
Visibility6.2 mi
Dew point21°
Fri, 1658° / 31°0Clear
58 °Clear

Ajax, Friday, 16 October

Clear. High 58°, low 31°.

Pressure30.62 inHg
Wind12.5 mph S
Humidity45%
Visibility6.2 mi
Dew point23°
Sat, 1775° / 44°0Mostly clear
75 °Mostly clear

Ajax, Saturday, 17 October

Mostly clear. High 75°, low 44°.

Pressure29.94 inHg
Wind8.1 mph W
Humidity22%
Visibility—
Dew point28°
Sun, 1864° / 51°0Overcast
64 °Overcast

Ajax, Sunday, 18 October

Overcast. High 64°, low 51°.

Pressure30.00 inHg
Wind13 mph W
Humidity37%
Visibility—
Dew point35°
Mon, 1972° / 47°0Clear
72 °Clear

Ajax, Monday, 19 October

Clear. High 72°, low 47°.

Pressure29.88 inHg
Wind21.3 mph S
Humidity32%
Visibility—
Dew point32°
Tue, 2077° / 51°0Mostly clear
77 °Mostly clear

Ajax, Tuesday, 20 October

Mostly clear. High 77°, low 51°.

Pressure29.65 inHg
Wind12.9 mph S
Humidity22%
Visibility—
Dew point30°
Wed, 2160° / 47°0.01Light rain
60 °Light rain

Ajax, Wednesday, 21 October

Light rain. High 60°, low 47°.

Pressure29.71 inHg
Wind20.4 mph NW
Humidity47%
Visibility—
Dew point37°
Thu, 2248° / 42°0.29Rain
48 °Rain

Ajax, Thursday, 22 October

Rain. High 48°, low 42°.

Pressure29.85 inHg
Wind8.6 mph N
Humidity80%
Visibility—
Dew point38°
Fri, 2351° / 39°0Clear
51 °Clear

Ajax, Friday, 23 October

Clear. High 51°, low 39°.

Pressure30.06 inHg
Wind19.3 mph NW
Humidity39%
Visibility—
Dew point25°
Sat, 2450° / 35°0Overcast
50 °Overcast

Ajax, Saturday, 24 October

Overcast. High 50°, low 35°.

Pressure30.30 inHg
Wind7.7 mph SE
Humidity40%
Visibility—
Dew point23°
Sun, 2553° / 36°0Partly cloudy
53 °Partly cloudy

Ajax, Sunday, 25 October

Partly cloudy. High 53°, low 36°.

Pressure30.12 inHg
Wind6.6 mph E
Humidity40%
Visibility—
Dew point25°
Mon, 2651° / 38°0Overcast
51 °Overcast

Ajax, Monday, 26 October

Overcast. High 51°, low 38°.

Pressure30.30 inHg
Wind7.8 mph NE
Humidity48%
Visibility—
Dew point29°
Tue, 2759° / 39°0Clear
59 °Clear

Ajax, Tuesday, 27 October

Clear. High 59°, low 39°.

Pressure30.18 inHg
Wind6.6 mph E
Humidity44%
Visibility—
Dew point31°
Wed, 2864° / 42°0Partly cloudy
64 °Partly cloudy

Ajax, Wednesday, 28 October

Partly cloudy. High 64°, low 42°.

Pressure29.97 inHg
Wind9.6 mph SW
Humidity43%
Visibility—
Dew point33°
From day 17 onward the outlook is built from 60-year climate statistics
Thu, 2954° / 35°0.07Climate normal
54 °Climate normal

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°0.04Climate normal
52 °Climate normal

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°0.03Climate normal
52 °Climate normal

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°0.05Climate normal
51 °Climate normal

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°0.04Climate normal
51 °Climate normal

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°0.04Climate normal
51 °Climate normal

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°0.01Climate normal
53 °Climate normal

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°0.03Climate normal
52 °Climate normal

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°0.04Climate normal
51 °Climate normal

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°0.03Climate normal
52 °Climate normal

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°0.06Climate normal
50 °Climate normal

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°0.06Climate normal
46 °Climate normal

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°0.04Climate normal
47 °Climate normal

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°0.02Climate normal
45 °Climate normal

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)

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.