As of 09:43 CDT

Weather in Sinai, SD

38°Current weather

Sinai, Thursday, 29 October, 09:43

Fog. Feels like 35°. High 52°, low 36°.

Pressure30.21 inHg
Wind3.4 mph N
Humidity100%
Visibility0.2 mi
Dew point38°

Monthly outlook for Sinai, SD: average high 53.8°, average low 42.3°. That is 4.3° above the climate normal for October. Precipitation is expected on 2 days (about 1.6 inches), against a normal of 3 days and 0.8 inches. The warmest day looks like 2 November (63.3°), the coolest 6 November (32.5°).

53.8°/42.3°
Average high / low
+4.3°
Above normal
2 / 3
Wet days / normal
1.6 in
Precipitation this month

Ten-day blocks vs climate normal

PeriodForecast highNormalDifference
29 October – 7 November53.6°48.3°+2.9°
8 November – 17 November54.2°42.1°+6.8°
18 November – 27 Novemberat normal36.8°—

October records over 66 years

88.5°3 October 2025All-time high
8.2°26 October 2020All-time low

Climate normals and records are computed from the nearest reference point — Nunda (6 mi).

Fri, 3055° / 38°0Overcast
55 °Overcast

Sinai, Friday, 30 October

Overcast. High 55°, low 38°.

Pressure30.27 inHg
Wind10 mph SE
Humidity60%
Visibility6.2 mi
Dew point39°
Sat, 3162° / 47°0Overcast
62 °Overcast

Sinai, Saturday, 31 October

Overcast. High 62°, low 47°.

Pressure30.15 inHg
Wind8.7 mph SE
Humidity91%
Visibility6.2 mi
Dew point51°
Sun, 0161° / 49°0Overcast
61 °Overcast

Sinai, Sunday, 1 November

Overcast. High 61°, low 49°.

Pressure30.18 inHg
Wind10.7 mph S
Humidity81%
Visibility6.2 mi
Dew point52°
Mon, 0263° / 53°1.37Heavy rain
63 °Heavy rain

Sinai, Monday, 2 November

Heavy rain. High 63°, low 53°.

Pressure29.53 inHg
Wind17.1 mph SE
Humidity96%
Visibility—
Dew point57°
Tue, 0354° / 47°0.25Light rain
54 °Light rain

Sinai, Tuesday, 3 November

Light rain. High 54°, low 47°.

Pressure29.85 inHg
Wind20 mph NW
Humidity94%
Visibility—
Dew point47°
Wed, 0448° / 42°0Overcast
48 °Overcast

Sinai, Wednesday, 4 November

Overcast. High 48°, low 42°.

Pressure30.00 inHg
Wind14.9 mph N
Humidity49%
Visibility—
Dew point29°
Thu, 0547° / 37°0Overcast
47 °Overcast

Sinai, Thursday, 5 November

Overcast. High 47°, low 37°.

Pressure29.97 inHg
Wind15.2 mph N
Humidity43%
Visibility—
Dew point25°
Fri, 0644° / 33°0Overcast
44 °Overcast

Sinai, Friday, 6 November

Overcast. High 44°, low 33°.

Pressure30.09 inHg
Wind10.2 mph N
Humidity48%
Visibility—
Dew point23°
Sat, 0748° / 35°0Overcast
48 °Overcast

Sinai, Saturday, 7 November

Overcast. High 48°, low 35°.

Pressure30.24 inHg
Wind10.6 mph S
Humidity43%
Visibility—
Dew point23°
Sun, 0850° / 37°0Overcast
50 °Overcast

Sinai, Sunday, 8 November

Overcast. High 50°, low 37°.

Pressure30.18 inHg
Wind12.6 mph S
Humidity66%
Visibility—
Dew point35°
Mon, 0956° / 39°0Clear
56 °Clear

Sinai, Monday, 9 November

Clear. High 56°, low 39°.

Pressure30.12 inHg
Wind10.7 mph S
Humidity69%
Visibility—
Dew point42°
Tue, 1058° / 44°0Clear
58 °Clear

Sinai, Tuesday, 10 November

Clear. High 58°, low 44°.

Pressure30.09 inHg
Wind7.8 mph SW
Humidity53%
Visibility—
Dew point38°
Wed, 1157° / 44°0Overcast
57 °Overcast

Sinai, Wednesday, 11 November

Overcast. High 57°, low 44°.

Pressure29.88 inHg
Wind19.2 mph S
Humidity67%
Visibility—
Dew point44°
Thu, 1252° / 49°0Light rain
52 °Light rain

Sinai, Thursday, 12 November

Light rain. High 52°, low 49°.

Pressure29.38 inHg
Wind17.4 mph S
Humidity88%
Visibility—
Dew point48°
Fri, 1352° / 46°0.01Light rain
52 °Light rain

Sinai, Friday, 13 November

Light rain. High 52°, low 46°.

Pressure29.35 inHg
Wind13.3 mph N
Humidity59%
Visibility—
Dew point37°
From day 17 onward the outlook is built from 60-year climate statistics
Sat, 1442° / 29°0.03Climate normal
42 °Climate normal

Sinai, Saturday, 14 November

Climate normal for this date — 60-year average.

Average high42°
Average low29°
Average precipitation0.03 in
Chance of precipitation17%
Record high68° (2025)
Record low5° (2014)
Sun, 1542° / 28°0.04Climate normal
42 °Climate normal

Sinai, Sunday, 15 November

Climate normal for this date — 60-year average.

Average high42°
Average low28°
Average precipitation0.04 in
Chance of precipitation17%
Record high63° (2001)
Record low11° (2000)
Mon, 1642° / 28°0.06Climate normal
42 °Climate normal

Sinai, Monday, 16 November

Climate normal for this date — 60-year average.

Average high42°
Average low28°
Average precipitation0.06 in
Chance of precipitation18%
Record high67° (2001)
Record low0° (2014)
Tue, 1741° / 27°0.05Climate normal
41 °Climate normal

Sinai, Tuesday, 17 November

Climate normal for this date — 60-year average.

Average high41°
Average low27°
Average precipitation0.05 in
Chance of precipitation18%
Record high64° (2001)
Record low4° (2014)
Wed, 1840° / 27°0.07Climate normal
40 °Climate normal

Sinai, Wednesday, 18 November

Climate normal for this date — 60-year average.

Average high40°
Average low27°
Average precipitation0.07 in
Chance of precipitation25%
Record high65° (1999)
Record low3° (1996)
Thu, 1940° / 26°0.09Climate normal
40 °Climate normal

Sinai, Thursday, 19 November

Climate normal for this date — 60-year average.

Average high40°
Average low26°
Average precipitation0.09 in
Chance of precipitation25%
Record high58° (2003)
Record low7° (1996)
Fri, 2038° / 25°0.05Climate normal
38 °Climate normal

Sinai, Friday, 20 November

Climate normal for this date — 60-year average.

Average high38°
Average low25°
Average precipitation0.05 in
Chance of precipitation15%
Record high61° (1962)
Record low2° (1985)
Sat, 2138° / 23°0.02Climate normal
38 °Climate normal

Sinai, Saturday, 21 November

Climate normal for this date — 60-year average.

Average high38°
Average low23°
Average precipitation0.02 in
Chance of precipitation15%
Record high62° (2012)
Record low-4° (1985)
Sun, 2238° / 24°0.02Climate normal
38 °Climate normal

Sinai, Sunday, 22 November

Climate normal for this date — 60-year average.

Average high38°
Average low24°
Average precipitation0.02 in
Chance of precipitation18%
Record high58° (1974)
Record low6° (1970)
Mon, 2337° / 24°0.03Climate normal
37 °Climate normal

Sinai, Monday, 23 November

Climate normal for this date — 60-year average.

Average high37°
Average low24°
Average precipitation0.03 in
Chance of precipitation15%
Record high54° (2006)
Record low-3° (1985)
Tue, 2437° / 23°0.04Climate normal
37 °Climate normal

Sinai, Tuesday, 24 November

Climate normal for this date — 60-year average.

Average high37°
Average low23°
Average precipitation0.04 in
Chance of precipitation8%
Record high59° (1990)
Record low-6° (1985)
Wed, 2536° / 23°0.02Climate normal
36 °Climate normal

Sinai, Wednesday, 25 November

Climate normal for this date — 60-year average.

Average high36°
Average low23°
Average precipitation0.02 in
Chance of precipitation12%
Record high58° (1960)
Record low0° (1975)
Thu, 2633° / 22°0.06Climate normal
33 °Climate normal

Sinai, Thursday, 26 November

Climate normal for this date — 60-year average.

Average high33°
Average low22°
Average precipitation0.06 in
Chance of precipitation37%
Record high56° (1998)
Record low-1° (1985)
Fri, 2732° / 20°0.07Climate normal
32 °Climate normal

Sinai, Friday, 27 November

Climate normal for this date — 60-year average.

Average high32°
Average low20°
Average precipitation0.07 in
Chance of precipitation25%
Record high60° (2017)
Record low-7° (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 Sinai, 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 Sinai, 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.