As of 20:05 CDT

Weather in Sinai, SD

41°Current weather

Sinai, Sunday, 25 October, 20:05

Overcast. Feels like 35°. High 46°, low 41°.

Pressure30.45 inHg
Wind9.2 mph NE
Humidity85%
Visibility6.2 mi
Dew point36°

Monthly outlook for Sinai, SD: average high 53.8°, average low 44.5°. That is 2.7° above the climate normal for October. Precipitation is expected on 7 days (about 3.0 inches), against a normal of 3 days and 0.9 inches. The warmest day looks like 1 November (63.9°), the coolest 26 October (36.7°).

53.8°/44.5°
Average high / low
+2.7°
Above normal
7 / 3
Wet days / normal
3.0 in
Precipitation this month

Ten-day blocks vs climate normal

PeriodForecast highNormalDifference
25 October – 3 November55°50.4°+2.6°
4 November – 13 November51.9°44.2°+4.2°
14 November – 23 Novemberat normal39.7°—

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).

Mon, 2641° / 37°0.94Rain
41 °Rain

Sinai, Monday, 26 October

Rain. High 41°, low 37°.

Pressure30.45 inHg
Wind10.6 mph NE
Humidity92%
Visibility2.0 mi
Dew point38°
Tue, 2752° / 39°0.1Rain
52 °Rain

Sinai, Tuesday, 27 October

Rain. High 52°, low 39°.

Pressure30.09 inHg
Wind7.4 mph SW
Humidity82%
Visibility6.2 mi
Dew point42°
Wed, 2860° / 47°0.04Light rain
60 °Light rain

Sinai, Wednesday, 28 October

Light rain. High 60°, low 47°.

Pressure29.94 inHg
Wind8.8 mph S
Humidity85%
Visibility6.2 mi
Dew point54°
Thu, 2962° / 42°0Clear
62 °Clear

Sinai, Thursday, 29 October

Clear. High 62°, low 42°.

Pressure30.12 inHg
Wind4.2 mph SE
Humidity65%
Visibility6.2 mi
Dew point43°
Fri, 3057° / 45°0Partly cloudy
57 °Partly cloudy

Sinai, Friday, 30 October

Partly cloudy. High 57°, low 45°.

Pressure30.18 inHg
Wind11 mph E
Humidity60%
Visibility—
Dew point40°
Sat, 3154° / 50°0.24Light rain
54 °Light rain

Sinai, Saturday, 31 October

Light rain. High 54°, low 50°.

Pressure30.06 inHg
Wind10 mph E
Humidity95%
Visibility—
Dew point50°
Sun, 0164° / 54°0Partly cloudy
64 °Partly cloudy

Sinai, Sunday, 1 November

Partly cloudy. High 64°, low 54°.

Pressure30.09 inHg
Wind7.5 mph SE
Humidity69%
Visibility—
Dew point51°
Mon, 0260° / 54°0.01Light rain
60 °Light rain

Sinai, Monday, 2 November

Light rain. High 60°, low 54°.

Pressure29.94 inHg
Wind19.4 mph SE
Humidity76%
Visibility—
Dew point51°
Tue, 0355° / 48°1.1Rain
55 °Rain

Sinai, Tuesday, 3 November

Rain. High 55°, low 48°.

Pressure29.94 inHg
Wind17.4 mph SE
Humidity96%
Visibility—
Dew point54°
Wed, 0454° / 42°0.09Light rain
54 °Light rain

Sinai, Wednesday, 4 November

Light rain. High 54°, low 42°.

Pressure30.06 inHg
Wind9 mph NW
Humidity54%
Visibility—
Dew point35°
Thu, 0556° / 43°0Overcast
56 °Overcast

Sinai, Thursday, 5 November

Overcast. High 56°, low 43°.

Pressure30.00 inHg
Wind7.3 mph SE
Humidity53%
Visibility—
Dew point36°
Fri, 0651° / 44°0.24Rain
51 °Rain

Sinai, Friday, 6 November

Rain. High 51°, low 44°.

Pressure29.80 inHg
Wind15.6 mph SE
Humidity69%
Visibility—
Dew point40°
Sat, 0756° / 47°0.03Light rain
56 °Light rain

Sinai, Saturday, 7 November

Light rain. High 56°, low 47°.

Pressure29.68 inHg
Wind12.2 mph W
Humidity72%
Visibility—
Dew point42°
Sun, 0850° / 42°0Mostly clear
50 °Mostly clear

Sinai, Sunday, 8 November

Mostly clear. High 50°, low 42°.

Pressure29.68 inHg
Wind22.8 mph NW
Humidity48%
Visibility—
Dew point30°
Mon, 0944° / 38°0Overcast
44 °Overcast

Sinai, Monday, 9 November

Overcast. High 44°, low 38°.

Pressure29.77 inHg
Wind23.3 mph NW
Humidity55%
Visibility—
Dew point28°
From day 17 onward the outlook is built from 60-year climate statistics
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)
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)

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.