As of 11:59 CDT

Weather in Sinai, SD

64°

Sinai, Thursday, 22 October, 11:59

Clear. Feels like 64°. High 72°, low 43°.

Pressure30.12 inHg

Wind8.1 mph S

Humidity85%

Visibility6.2 mi

Dew point60°

See detailed hourly forecast

Monthly outlook for Sinai, SD: average high 57.6°, average low 42.5°. That is 4° above the climate normal for October. Precipitation is expected on 4 days (about 1.7 inches), against a normal of 3 days and 0.8 inches. The warmest day looks like 22 October (72.3°), the coolest 29 October (31.4°).

57.6°/42.5°

Average high / low

+4°

Above normal

4 / 3

Wet days / normal

1.7 in

Precipitation this month

Ten-day blocks vs climate normal

Period	Forecast high	Normal	Difference
22 October – 31 October	55.3°	52.3°	+1.7°
1 November – 10 November	61.5°	46.3°	+8.4°
11 November – 20 November	at normal	40.7°	—

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, 2370° / 54°

0.02

70 °

Sinai, Friday, 23 October

Light rain. High 70°, low 54°.

Pressure29.94 inHg

Wind16.6 mph S

Humidity81%

Visibility6.2 mi

Dew point55°

Sat, 2463° / 47°

0.14

63 °

Sinai, Saturday, 24 October

Rain. High 63°, low 47°.

Pressure30.21 inHg

Wind13.7 mph NW

Humidity64%

Visibility6.2 mi

Dew point43°

Sun, 2546° / 42°

0.09

46 °

Sinai, Sunday, 25 October

Light rain. High 46°, low 42°.

Pressure30.47 inHg

Wind6.7 mph NE

Humidity80%

Visibility5.6 mi

Dew point39°

Mon, 2643° / 42°

1.17

43 °

Sinai, Monday, 26 October

Rain. High 43°, low 42°.

Pressure30.42 inHg

Wind13.6 mph E

Humidity95%

Visibility—

Dew point41°

Tue, 2751° / 43°

0.31

51 °

Sinai, Tuesday, 27 October

Rain. High 51°, low 43°.

Pressure30.09 inHg

Wind13.2 mph E

Humidity86%

Visibility—

Dew point45°

Wed, 2858° / 44°

58 °

Sinai, Wednesday, 28 October

Overcast. High 58°, low 44°.

Pressure29.85 inHg

Wind21.9 mph NW

Humidity71%

Visibility—

Dew point42°

Thu, 2946° / 31°

46 °

Sinai, Thursday, 29 October

Clear. High 46°, low 31°.

Pressure30.39 inHg

Wind20.1 mph NW

Humidity45%

Visibility—

Dew point21°

Fri, 3050° / 32°

50 °

Sinai, Friday, 30 October

Overcast. High 50°, low 32°.

Pressure30.09 inHg

Wind16.6 mph S

Humidity44%

Visibility—

Dew point25°

Sat, 3154° / 41°

54 °

Sinai, Saturday, 31 October

Overcast. High 54°, low 41°.

Pressure29.74 inHg

Wind12.7 mph S

Humidity78%

Visibility—

Dew point44°

Sun, 0161° / 46°

61 °

Sinai, Sunday, 1 November

Overcast. High 61°, low 46°.

Pressure30.00 inHg

Wind9.9 mph NW

Humidity36%

Visibility—

Dew point29°

Mon, 0259° / 41°

59 °

Sinai, Monday, 2 November

Mostly clear. High 59°, low 41°.

Pressure30.15 inHg

Wind13.8 mph S

Humidity40%

Visibility—

Dew point32°

Tue, 0360° / 41°

60 °

Sinai, Tuesday, 3 November

Mostly clear. High 60°, low 41°.

Pressure30.27 inHg

Wind9.1 mph NW

Humidity32%

Visibility—

Dew point25°

Wed, 0459° / 40°

59 °

Sinai, Wednesday, 4 November

Mostly clear. High 59°, low 40°.

Pressure30.09 inHg

Wind15.8 mph S

Humidity41%

Visibility—

Dew point31°

Thu, 0562° / 46°

62 °

Sinai, Thursday, 5 November

Clear. High 62°, low 46°.

Pressure29.83 inHg

Wind17 mph S

Humidity68%

Visibility—

Dew point48°

Fri, 0668° / 47°

68 °

Sinai, Friday, 6 November

Clear. High 68°, low 47°.

Pressure29.94 inHg

Wind8.4 mph S

Humidity38%

Visibility—

Dew point37°

From day 17 onward the outlook is built from 60-year climate statistics

Sat, 0747° / 31°

0.02

47 °

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°

0.06

46 °

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°

0.13

44 °

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°

0.06

41 °

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°

0.03

40 °

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°

0.06

40 °

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°

0.03

42 °

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°

0.03

42 °

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°

0.04

42 °

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°

0.06

42 °

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°

0.05

41 °

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°

0.07

40 °

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°

0.09

40 °

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°

0.05

38 °

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.