As of 16:39 CDT

Weather in Sinai, SD

73°Current weather

Sinai, Friday, 23 October, 16:39

Mostly clear. Feels like 73°. High 73°, low 57°.

Pressure29.85 inHg
Wind27.6 mph S
Humidity61%
Visibility6.2 mi
Dew point59°

Monthly outlook for Sinai, SD: average high 55.2°, average low 45.5°. That is 2.9° above the climate normal for October. Precipitation is expected on 9 days (about 3.5 inches), against a normal of 3 days and 0.8 inches. The warmest day looks like 23 October (73.1°), the coolest 4 November (37.1°).

55.2°/45.5°
Average high / low
+2.9°
Above normal
9 / 3
Wet days / normal
3.5 in
Precipitation this month

Ten-day blocks vs climate normal

PeriodForecast highNormalDifference
23 October – 1 November53.8°51.6°+1.2°
2 November – 11 November57.6°45.5°+6.8°
12 November – 21 Novemberat normal40.5°—

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).

Sat, 2462° / 48°0.2Rain
62 °Rain

Sinai, Saturday, 24 October

Rain. High 62°, low 48°.

Pressure30.21 inHg
Wind13.9 mph NW
Humidity80%
Visibility1.7 mi
Dew point47°
Sun, 2547° / 42°0.22Rain
47 °Rain

Sinai, Sunday, 25 October

Rain. High 47°, low 42°.

Pressure30.47 inHg
Wind5.5 mph E
Humidity56%
Visibility4.7 mi
Dew point32°
Mon, 2642° / 40°1.04Rain
42 °Rain

Sinai, Monday, 26 October

Rain. High 42°, low 40°.

Pressure30.42 inHg
Wind13.4 mph NE
Humidity93%
Visibility2.7 mi
Dew point39°
Tue, 2750° / 43°0.18Rain
50 °Rain

Sinai, Tuesday, 27 October

Rain. High 50°, low 43°.

Pressure30.12 inHg
Wind9.7 mph SW
Humidity77%
Visibility6.2 mi
Dew point39°
Wed, 2850° / 42°0.07Light rain
50 °Light rain

Sinai, Wednesday, 28 October

Light rain. High 50°, low 42°.

Pressure30.15 inHg
Wind13.4 mph W
Humidity68%
Visibility—
Dew point36°
Thu, 2949° / 40°0Overcast
49 °Overcast

Sinai, Thursday, 29 October

Overcast. High 49°, low 40°.

Pressure30.24 inHg
Wind12.1 mph NW
Humidity65%
Visibility—
Dew point37°
Fri, 3055° / 39°0Overcast
55 °Overcast

Sinai, Friday, 30 October

Overcast. High 55°, low 39°.

Pressure30.15 inHg
Wind13.3 mph SE
Humidity61%
Visibility—
Dew point37°
Sat, 3153° / 48°0.2Rain
53 °Rain

Sinai, Saturday, 31 October

Rain. High 53°, low 48°.

Pressure29.85 inHg
Wind12 mph S
Humidity97%
Visibility—
Dew point51°
Sun, 0156° / 52°0Overcast
56 °Overcast

Sinai, Sunday, 1 November

Overcast. High 56°, low 52°.

Pressure30.12 inHg
Wind11.8 mph E
Humidity84%
Visibility—
Dew point50°
Mon, 0253° / 51°1.11Rain
53 °Rain

Sinai, Monday, 2 November

Rain. High 53°, low 51°.

Pressure30.00 inHg
Wind16.8 mph E
Humidity95%
Visibility—
Dew point50°
Tue, 0350° / 40°0.06Light rain
50 °Light rain

Sinai, Tuesday, 3 November

Light rain. High 50°, low 40°.

Pressure30.36 inHg
Wind20.1 mph N
Humidity51%
Visibility—
Dew point31°
Wed, 0456° / 37°0Partly cloudy
56 °Partly cloudy

Sinai, Wednesday, 4 November

Partly cloudy. High 56°, low 37°.

Pressure30.24 inHg
Wind18.7 mph SW
Humidity42%
Visibility—
Dew point29°
Thu, 0567° / 47°0Clear
67 °Clear

Sinai, Thursday, 5 November

Clear. High 67°, low 47°.

Pressure29.97 inHg
Wind10.6 mph SW
Humidity36%
Visibility—
Dew point35°
Fri, 0663° / 47°0Overcast
63 °Overcast

Sinai, Friday, 6 November

Overcast. High 63°, low 47°.

Pressure29.80 inHg
Wind9.1 mph SE
Humidity62%
Visibility—
Dew point45°
Sat, 0757° / 54°0.43Rain
57 °Rain

Sinai, Saturday, 7 November

Rain. High 57°, low 54°.

Pressure29.77 inHg
Wind12 mph E
Humidity89%
Visibility—
Dew point53°
From day 17 onward the outlook is built from 60-year climate statistics
Sun, 0846° / 31°0.06Climate normal
46 °Climate normal

Sinai, Sunday, 8 November

Climate normal for this date — 60-year average.

Average high46°
Average low31°
Average precipitation0.06 in
Chance of precipitation15%
Record high72° (1999)
Record low4° (1991)
Mon, 0944° / 30°0.13Climate normal
44 °Climate normal

Sinai, Monday, 9 November

Climate normal for this date — 60-year average.

Average high44°
Average low30°
Average precipitation0.13 in
Chance of precipitation20%
Record high67° (1999)
Record low13° (2018)
Tue, 1041° / 27°0.06Climate normal
41 °Climate normal

Sinai, Tuesday, 10 November

Climate normal for this date — 60-year average.

Average high41°
Average low27°
Average precipitation0.06 in
Chance of precipitation20%
Record high63° (2016)
Record low5° (1986)
Wed, 1140° / 26°0.03Climate normal
40 °Climate normal

Sinai, Wednesday, 11 November

Climate normal for this date — 60-year average.

Average high40°
Average low26°
Average precipitation0.03 in
Chance of precipitation20%
Record high62° (2005)
Record low0° (1986)
Thu, 1240° / 26°0.06Climate normal
40 °Climate normal

Sinai, Thursday, 12 November

Climate normal for this date — 60-year average.

Average high40°
Average low26°
Average precipitation0.06 in
Chance of precipitation23%
Record high64° (2005)
Record low-2° (1966)
Fri, 1342° / 28°0.03Climate normal
42 °Climate normal

Sinai, Friday, 13 November

Climate normal for this date — 60-year average.

Average high42°
Average low28°
Average precipitation0.03 in
Chance of precipitation20%
Record high67° (1999)
Record low-5° (1986)
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)

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.