As of 20:25 CDT

Weather in Sinai, SD

64°Current weather

Sinai, Thursday, 22 October, 20:25

Clear. Feels like 64°. High 76°, low 43°.

Pressure30.03 inHg
Wind11.5 mph SE
Humidity83%
Visibility6.2 mi
Dew point58°

Monthly outlook for Sinai, SD: average high 54.4°, average low 41.4°. That is 2.1° above the climate normal for October. Precipitation is expected on 8 days (about 3.6 inches), against a normal of 3 days and 0.8 inches. The warmest day looks like 22 October (75.7°), the coolest 4 November (32.3°).

54.4°/41.4°
Average high / low
+2.1°
Above normal
8 / 3
Wet days / normal
3.6 in
Precipitation this month

Ten-day blocks vs climate normal

PeriodForecast highNormalDifference
22 October – 31 October57°52.3°+2.6°
1 November – 10 November50°46.3°+2°
11 November – 20 Novemberat normal40.7°—

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).

Fri, 2372° / 54°0.1Rain
72 °Rain

Sinai, Friday, 23 October

Rain. High 72°, low 54°.

Pressure29.97 inHg
Wind17.2 mph S
Humidity90%
Visibility3.1 mi
Dew point55°
Sat, 2459° / 47°0.1Rain
59 °Rain

Sinai, Saturday, 24 October

Rain. High 59°, low 47°.

Pressure30.18 inHg
Wind13.5 mph NW
Humidity69%
Visibility6.2 mi
Dew point46°
Sun, 2552° / 42°0.07Light rain
52 °Light rain

Sinai, Sunday, 25 October

Light rain. High 52°, low 42°.

Pressure30.47 inHg
Wind7.4 mph NE
Humidity46%
Visibility6.2 mi
Dew point30°
Mon, 2644° / 42°1.41Rain
44 °Rain

Sinai, Monday, 26 October

Rain. High 44°, low 42°.

Pressure30.42 inHg
Wind12.5 mph E
Humidity91%
Visibility1.9 mi
Dew point40°
Tue, 2754° / 45°0.15Light rain
54 °Light rain

Sinai, Tuesday, 27 October

Light rain. High 54°, low 45°.

Pressure30.12 inHg
Wind13.8 mph E
Humidity76%
Visibility—
Dew point44°
Wed, 2867° / 47°0.25Rain
67 °Rain

Sinai, Wednesday, 28 October

Rain. High 67°, low 47°.

Pressure29.74 inHg
Wind23.1 mph W
Humidity86%
Visibility—
Dew point53°
Thu, 2948° / 40°0Overcast
48 °Overcast

Sinai, Thursday, 29 October

Overcast. High 48°, low 40°.

Pressure30.24 inHg
Wind15 mph NW
Humidity64%
Visibility—
Dew point34°
Fri, 3045° / 37°0.43Rain
45 °Rain

Sinai, Friday, 30 October

Rain. High 45°, low 37°.

Pressure30.18 inHg
Wind16.6 mph E
Humidity72%
Visibility—
Dew point34°
Sat, 3154° / 44°1.07Heavy rain
54 °Heavy rain

Sinai, Saturday, 31 October

Heavy rain. High 54°, low 44°.

Pressure29.68 inHg
Wind15.1 mph E
Humidity95%
Visibility—
Dew point50°
Sun, 0153° / 38°0Clear
53 °Clear

Sinai, Sunday, 1 November

Clear. High 53°, low 38°.

Pressure30.00 inHg
Wind14.6 mph W
Humidity53%
Visibility—
Dew point33°
Mon, 0242° / 37°0.04Snow
42 °Snow

Sinai, Monday, 2 November

Snow. High 42°, low 37°.

Pressure30.24 inHg
Wind11.7 mph W
Humidity78%
Visibility—
Dew point32°
Tue, 0342° / 36°0.01Light rain
42 °Light rain

Sinai, Tuesday, 3 November

Light rain. High 42°, low 36°.

Pressure30.45 inHg
Wind10.8 mph NW
Humidity85%
Visibility—
Dew point35°
Wed, 0446° / 32°0Partly cloudy
46 °Partly cloudy

Sinai, Wednesday, 4 November

Partly cloudy. High 46°, low 32°.

Pressure30.24 inHg
Wind14.9 mph NW
Humidity56%
Visibility—
Dew point28°
Thu, 0556° / 36°0Overcast
56 °Overcast

Sinai, Thursday, 5 November

Overcast. High 56°, low 36°.

Pressure30.00 inHg
Wind14.1 mph NW
Humidity46%
Visibility—
Dew point31°
Fri, 0660° / 44°0Clear
60 °Clear

Sinai, Friday, 6 November

Clear. High 60°, low 44°.

Pressure29.97 inHg
Wind10.5 mph W
Humidity49%
Visibility—
Dew point38°
From day 17 onward the outlook is built from 60-year climate statistics
Sat, 0747° / 31°0.02Climate normal
47 °Climate normal

Sinai, Saturday, 7 November

Climate normal for this date — 60-year average.

Average high47°
Average low31°
Average precipitation0.02 in
Chance of precipitation12%
Record high71° (2020)
Record low-8° (1991)
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)

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.