As of 15:32 CDT

Weather in Sinai, SD

55°Current weather

Sinai, Friday, 30 October, 15:32

Overcast. Feels like 54°. High 55°, low 38°.

Pressure30.15 inHg
Wind13.8 mph E
Humidity77%
Visibility6.2 mi
Dew point48°

Monthly outlook for Sinai, SD: average high 55.8°, average low 47.1°. That is 5.8° above the climate normal for October. Precipitation is expected on 9 days (about 6.6 inches), against a normal of 3 days and 0.8 inches. The warmest day looks like 1 November (63.3°), the coolest 14 November (36.9°).

55.8°/47.1°
Average high / low
+5.8°
Above normal
9 / 3
Wet days / normal
6.6 in
Precipitation this month

Ten-day blocks vs climate normal

PeriodForecast highNormalDifference
30 October – 8 November56.8°47.8°+5°
9 November – 18 November54.2°41.5°+7.1°
19 November – 28 Novemberat normal36.1°—

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, 3160° / 44°0.86Heavy rain
60 °Heavy rain

Sinai, Saturday, 31 October

Heavy rain. High 60°, low 44°.

Pressure30.09 inHg
Wind10.1 mph S
Humidity90%
Visibility6.2 mi
Dew point55°
Sun, 0163° / 51°0.01Light rain
63 °Light rain

Sinai, Sunday, 1 November

Light rain. High 63°, low 51°.

Pressure30.12 inHg
Wind13.4 mph S
Humidity83%
Visibility6.2 mi
Dew point54°
Mon, 0259° / 56°2.39Heavy rain
59 °Heavy rain

Sinai, Monday, 2 November

Heavy rain. High 59°, low 56°.

Pressure29.65 inHg
Wind16.4 mph SE
Humidity95%
Visibility1.3 mi
Dew point57°
Tue, 0362° / 54°1.07Rain
62 °Rain

Sinai, Tuesday, 3 November

Rain. High 62°, low 54°.

Pressure29.56 inHg
Wind7.4 mph E
Humidity94%
Visibility2.6 mi
Dew point59°
Wed, 0453° / 48°0.17Rain
53 °Rain

Sinai, Wednesday, 4 November

Rain. High 53°, low 48°.

Pressure29.74 inHg
Wind14.7 mph NW
Humidity84%
Visibility—
Dew point47°
Thu, 0548° / 45°0.28Rain
48 °Rain

Sinai, Thursday, 5 November

Rain. High 48°, low 45°.

Pressure29.91 inHg
Wind11.4 mph NW
Humidity92%
Visibility—
Dew point46°
Fri, 0656° / 44°0Overcast
56 °Overcast

Sinai, Friday, 6 November

Overcast. High 56°, low 44°.

Pressure29.91 inHg
Wind9.1 mph S
Humidity70%
Visibility—
Dew point44°
Sat, 0757° / 47°0.84Rain
57 °Rain

Sinai, Saturday, 7 November

Rain. High 57°, low 47°.

Pressure29.97 inHg
Wind13.5 mph NE
Humidity65%
Visibility—
Dew point44°
Sun, 0853° / 51°0.3Rain
53 °Rain

Sinai, Sunday, 8 November

Rain. High 53°, low 51°.

Pressure30.18 inHg
Wind14.2 mph NE
Humidity97%
Visibility—
Dew point51°
Mon, 0956° / 52°0.39Rain
56 °Rain

Sinai, Monday, 9 November

Rain. High 56°, low 52°.

Pressure30.09 inHg
Wind14.2 mph E
Humidity95%
Visibility—
Dew point53°
Tue, 1057° / 50°0.24Rain
57 °Rain

Sinai, Tuesday, 10 November

Rain. High 57°, low 50°.

Pressure29.88 inHg
Wind10.7 mph SE
Humidity80%
Visibility—
Dew point49°
Wed, 1159° / 46°0Mostly clear
59 °Mostly clear

Sinai, Wednesday, 11 November

Mostly clear. High 59°, low 46°.

Pressure29.83 inHg
Wind6.8 mph SE
Humidity69%
Visibility—
Dew point46°
Thu, 1258° / 48°0Overcast
58 °Overcast

Sinai, Thursday, 12 November

Overcast. High 58°, low 48°.

Pressure29.59 inHg
Wind9.8 mph SE
Humidity71%
Visibility—
Dew point46°
Fri, 1349° / 43°0.01Light rain
49 °Light rain

Sinai, Friday, 13 November

Light rain. High 49°, low 43°.

Pressure29.74 inHg
Wind20.2 mph NW
Humidity81%
Visibility—
Dew point41°
Sat, 1446° / 37°0Clear
46 °Clear

Sinai, Saturday, 14 November

Clear. High 46°, low 37°.

Pressure29.74 inHg
Wind14.8 mph NW
Humidity62%
Visibility—
Dew point31°
From day 17 onward the outlook is built from 60-year climate statistics
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)
Sat, 2833° / 19°0.07Climate normal
33 °Climate normal

Sinai, Saturday, 28 November

Climate normal for this date — 60-year average.

Average high33°
Average low19°
Average precipitation0.07 in
Chance of precipitation22%
Record high56° (1998)
Record low-8° (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.