As of 08:44 MDT

Weather in Ajax, SD

51°Current weather

Ajax, Thursday, 15 October, 08:44

Overcast. Feels like 49°. High 51°, low 38°.

Pressure30.30 inHg
Wind8 mph N
Humidity53%
Visibility6.2 mi
Dew point35°

Monthly outlook for Ajax, SD: average high 60.6°, average low 43.3°. That is 1.5° above the climate normal for October. Precipitation is expected on 5 days (about 0.8 inches), against a normal of 3 days and 0.7 inches. The warmest day looks like 21 October (80.5°), the coolest 16 October (29.6°).

60.6°/43.3°
Average high / low
+1.5°
Above normal
5 / 3
Wet days / normal
0.8 in
Precipitation this month

Ten-day blocks vs climate normal

PeriodForecast highNormalDifference
15 October – 24 October64.6°59.3°+3°
25 October – 3 November54°54°+0°
4 November – 13 Novemberat normal49.2°—

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).

Fri, 1653° / 30°0Clear
53 °Clear

Ajax, Friday, 16 October

Clear. High 53°, low 30°.

Pressure30.68 inHg
Wind8.7 mph S
Humidity49%
Visibility6.2 mi
Dew point25°
Sat, 1775° / 43°0Clear
75 °Clear

Ajax, Saturday, 17 October

Clear. High 75°, low 43°.

Pressure30.03 inHg
Wind4.3 mph SE
Humidity23%
Visibility6.2 mi
Dew point32°
Sun, 1865° / 50°0Clear
65 °Clear

Ajax, Sunday, 18 October

Clear. High 65°, low 50°.

Pressure30.06 inHg
Wind12.1 mph N
Humidity36%
Visibility6.2 mi
Dew point36°
Mon, 1961° / 41°0Clear
61 °Clear

Ajax, Monday, 19 October

Clear. High 61°, low 41°.

Pressure30.06 inHg
Wind8.6 mph SE
Humidity53%
Visibility—
Dew point39°
Tue, 2072° / 46°0Clear
72 °Clear

Ajax, Tuesday, 20 October

Clear. High 72°, low 46°.

Pressure29.97 inHg
Wind12.6 mph S
Humidity39%
Visibility—
Dew point39°
Wed, 2181° / 53°0Partly cloudy
81 °Partly cloudy

Ajax, Wednesday, 21 October

Partly cloudy. High 81°, low 53°.

Pressure29.80 inHg
Wind14 mph S
Humidity40%
Visibility—
Dew point45°
Thu, 2273° / 57°0.01Light rain
73 °Light rain

Ajax, Thursday, 22 October

Light rain. High 73°, low 57°.

Pressure29.68 inHg
Wind11.4 mph SE
Humidity43%
Visibility—
Dew point47°
Fri, 2360° / 48°0.25Light rain
60 °Light rain

Ajax, Friday, 23 October

Light rain. High 60°, low 48°.

Pressure29.88 inHg
Wind26.8 mph N
Humidity76%
Visibility—
Dew point42°
Sat, 2456° / 43°0Overcast
56 °Overcast

Ajax, Saturday, 24 October

Overcast. High 56°, low 43°.

Pressure30.21 inHg
Wind13 mph NW
Humidity26%
Visibility—
Dew point18°
Sun, 2562° / 38°0Overcast
62 °Overcast

Ajax, Sunday, 25 October

Overcast. High 62°, low 38°.

Pressure30.12 inHg
Wind21.9 mph S
Humidity50%
Visibility—
Dew point35°
Mon, 2657° / 49°0Overcast
57 °Overcast

Ajax, Monday, 26 October

Overcast. High 57°, low 49°.

Pressure29.94 inHg
Wind13.3 mph S
Humidity54%
Visibility—
Dew point39°
Tue, 2749° / 44°0.22Light rain
49 °Light rain

Ajax, Tuesday, 27 October

Light rain. High 49°, low 44°.

Pressure29.80 inHg
Wind14.8 mph NW
Humidity70%
Visibility—
Dew point39°
Wed, 2857° / 42°0.04Light rain
57 °Light rain

Ajax, Wednesday, 28 October

Light rain. High 57°, low 42°.

Pressure29.59 inHg
Wind31.8 mph W
Humidity29%
Visibility—
Dew point21°
Thu, 2956° / 39°0.01Light rain
56 °Light rain

Ajax, Thursday, 29 October

Light rain. High 56°, low 39°.

Pressure29.77 inHg
Wind13 mph SE
Humidity37%
Visibility—
Dew point26°
Fri, 3044° / 35°0.17Snow
44 °Snow

Ajax, Friday, 30 October

Snow. High 44°, low 35°.

Pressure30.06 inHg
Wind18.3 mph NW
Humidity58%
Visibility—
Dew point28°
From day 17 onward the outlook is built from 60-year climate statistics
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)
Thu, 1248° / 28°0.03Climate normal
48 °Climate normal

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°0.04Climate normal
48 °Climate normal

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)

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.