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Sinai SD Weather - Clear - 54°F
Clear
54°F
Updated 8:37 am
Feels Like 50°F
Humidity 54%
Wind N 15 mph
Barometer  30.04 in
Dew Point 38°F
Sinai SD Weather - Clear - 12°C
Clear
12°C
Updated 8:37 am
Feels Like 10°C
Humidity 54%
Wind N 24 km/h
Barometer  101.7 kPa
Dew Point 3°C
Sinai, SD Weather and Current Conditionssinai sd weather forecast

Sinai, SD Weather Forecast

Sinai South Dakota WeatherSinai, South Dakota Weather Weather Forecast
14 day API weather forecast for Sinai, South Dakota. Note: The 7-day weather forecast for Sinai, SD is the most reliable and accurate weather forecast. This model should only be used as a likely scenario. It is difficult to predict weather more than 7 days ahead.
Sinai, SD Weather Forecast Dated: 837 AM Thu Oct 01 2026
Expect a cool pattern with a mix of sun and clouds and mostly dry weather over the coming period. moderate humidity and a stable pattern will dominate.

Thursday, October 1, 2026

Mid-Morning
Sinai Weather - 2026-10-01 - Morning - Overcast
51°F 11°C
Overcast
Mid-Afternoon
Sinai Weather - 2026-10-01 - Afternoon - Overcast
60°F 15°C
Overcast
Early-Evening
Sinai Weather - 2026-10-01 - Evening - Partly Cloudy
60°F 16°C
Partly Cloudy
Refreshing around 60°F 15°C, overcast through the afternoon, turning cloudy this evening, with lower humidity and steady pressure. Winds out of the N at 12 mph 19 km/h.

Friday, October 2, 2026

Mid-Morning
Sinai Weather - 2026-10-02 - Morning - Drizzle
41°F 5°C
Drizzle
Mid-Afternoon
Sinai Weather - 2026-10-02 - Afternoon - Scattered Showers
49°F 9°C
Scattered Showers
Early-Evening
Sinai Weather - 2026-10-02 - Evening - Scattered Showers
52°F 11°C
Scattered Showers
Cool and brisk at 49°F 9°C, scattered downpours possible, with lower humidity and barometric pressure falling. Winds switching from the ENE to the SE at 11 mph 18 km/h. Gusts up to 23 mph 36 km/h.

Saturday, October 3, 2026

Mid-Morning
Sinai Weather - 2026-10-03 - Morning - Sunny
48°F 9°C
Sunny
Mid-Afternoon
Sinai Weather - 2026-10-03 - Afternoon - Overcast
65°F 18°C
Overcast
Early-Evening
Sinai Weather - 2026-10-03 - Evening - Sunny
63°F 17°C
Sunny
Comfortable at 65°F 18°C, sunny in the morning, overcast in the afternoon, and sunny this evening, with steady humidity and steady pressure. Winds moving from the SSW to the N at 9 mph 15 km/h. Gusts up to 21 mph 33 km/h.

Sunday, October 4, 2026

Mid-Morning
Sinai Weather - 2026-10-04 - Morning - Overcast
46°F 8°C
Overcast
Mid-Afternoon
Sinai Weather - 2026-10-04 - Afternoon - Overcast
57°F 14°C
Overcast
Early-Evening
Sinai Weather - 2026-10-04 - Evening - Overcast
54°F 13°C
Overcast
Crisp with a high near 57°F 14°C, overcast through the afternoon, turning cloudy this evening, with lower humidity and steady pressure.

Monday, October 5, 2026

Mid-Morning
Sinai Weather - 2026-10-05 - Morning - Sunny
45°F 7°C
Sunny
Mid-Afternoon
Sinai Weather - 2026-10-05 - Afternoon - Sunny
57°F 14°C
Sunny
Early-Evening
Sinai Weather - 2026-10-05 - Evening - Sunny
56°F 13°C
Sunny
Brisk around 57°F 14°C, sunny through the afternoon, turning cloudy this evening, with steady humidity and barometric pressure falling. Winds swinging from the ESE to the SSE at 16 mph 25 km/h. Gusts up to 31 mph 50 km/h.

Tuesday, October 6, 2026

Mid-Morning
Sinai Weather - 2026-10-06 - Morning - Overcast
51°F 10°C
Overcast
Mid-Afternoon
Sinai Weather - 2026-10-06 - Afternoon - Overcast
61°F 16°C
Overcast
Early-Evening
Sinai Weather - 2026-10-06 - Evening - Overcast
63°F 17°C
Overcast
Mildly cool near 61°F 16°C, overcast throughout the day, with increasing humidity and steady pressure. Winds tapering down from S 21 mph 33 km/h to SSW 13 mph 20 km/h. Gusts up to 25 mph 40 km/h.

Wednesday, October 7, 2026

Mid-Morning
Sinai Weather - 2026-10-07 - Morning - Sunny
56°F 13°C
Sunny
Mid-Afternoon
Sinai Weather - 2026-10-07 - Afternoon - Partly Cloudy
65°F 19°C
Partly Cloudy
Early-Evening
Sinai Weather - 2026-10-07 - Evening - Cloudy
64°F 18°C
Cloudy
Comfortable at 65°F 19°C, sunny in the morning, cloudy in the afternoon, and sunny this evening, with lower humidity and steady pressure. Winds turning from the NNW to the S at 4 mph 6 km/h.

Thursday, October 8, 2026

Mid-Morning
Sinai Weather - 2026-10-08 - Morning - Overcast
53°F 12°C
Overcast
Mid-Afternoon
Sinai Weather - 2026-10-08 - Afternoon - Sunny
55°F 13°C
Sunny
Early-Evening
Sinai Weather - 2026-10-08 - Evening - Partly Cloudy
57°F 14°C
Partly Cloudy
Crisp with a high near 55°F 13°C, overcast in the morning, becoming sunny through the afternoon and evening, with lower humidity and barometric pressure rising. Winds switching from the ENE to the NNW at 12 mph 18 km/h. Gusts up to 25 mph 40 km/h.

Friday, October 9, 2026

Mid-Morning
Sinai Weather - 2026-10-09 - Morning - Sunny
38°F 3°C
Sunny
Mid-Afternoon
Sinai Weather - 2026-10-09 - Afternoon - Sunny
47°F 8°C
Sunny
Early-Evening
Sinai Weather - 2026-10-09 - Evening - Overcast
48°F 9°C
Overcast
Brisk around 47°F 8°C, sunny in the morning, becoming cloudy through the afternoon and evening, with lower humidity and steady pressure. Winds moving from the ESE to the E at 6 mph 9 km/h.

Saturday, October 10, 2026

Mid-Morning
Sinai Weather - 2026-10-10 - Morning - Sunny
40°F 5°C
Sunny
Mid-Afternoon
Sinai Weather - 2026-10-10 - Afternoon - Sunny
53°F 12°C
Sunny
Early-Evening
Sinai Weather - 2026-10-10 - Evening - Sunny
54°F 13°C
Sunny
Cool and brisk at 53°F 12°C, sunny throughout the day, with steady humidity and barometric pressure falling. Winds swinging from the S to the SSE at 15 mph 23 km/h. Gusts up to 30 mph 48 km/h.

Sunday, October 11, 2026

Mid-Morning
Sinai Weather - 2026-10-11 - Morning - Partly Cloudy
48°F 9°C
Partly Cloudy
Mid-Afternoon
Sinai Weather - 2026-10-11 - Afternoon - Overcast
65°F 18°C
Overcast
Early-Evening
Sinai Weather - 2026-10-11 - Evening - Sunny
62°F 17°C
Sunny
Comfortable at 65°F 18°C, partly cloudy through the afternoon, turning cloudy this evening, with lower humidity and steady pressure. Winds out of the NNW at 13 mph 21 km/h.

Monday, October 12, 2026

Mid-Morning
Sinai Weather - 2026-10-12 - Morning - Partly Cloudy
56°F 14°C
Partly Cloudy
Mid-Afternoon
Sinai Weather - 2026-10-12 - Afternoon - Cloudy
67°F 20°C
Cloudy
Early-Evening
Sinai Weather - 2026-10-12 - Evening - Sunny
56°F 13°C
Sunny
Cool with a high near 67°F 20°C, cloudy in the morning, partly cloudy in the afternoon, and sunny this evening, with steady humidity and steady pressure. Winds building from SW at 13 mph 21 km/h to NNW at 23 mph 37 km/h. Gusts up to 38 mph 62 km/h.

Tuesday, October 13, 2026

Mid-Morning
Sinai Weather - 2026-10-13 - Morning - Overcast
39°F 4°C
Overcast
Mid-Afternoon
Sinai Weather - 2026-10-13 - Afternoon - Sunny
47°F 8°C
Sunny
Early-Evening
Sinai Weather - 2026-10-13 - Evening - Sunny
48°F 9°C
Sunny
Brisk around 47°F 8°C, overcast in the morning, becoming sunny through the afternoon and evening, with lower humidity and steady pressure. Winds decreasing from N 21 mph 33 km/h to NE 7 mph 11 km/h.

Wednesday, October 14, 2026

Mid-Morning
Sinai Weather - 2026-10-14 - Morning - Sunny
43°F 6°C
Sunny
Mid-Afternoon
Sinai Weather - 2026-10-14 - Afternoon - Sunny
57°F 14°C
Sunny
Early-Evening
Sinai Weather - 2026-10-14 - Evening - Sunny
57°F 14°C
Sunny
Cool and brisk at 57°F 14°C, sunny throughout the day, with lower humidity and barometric pressure falling. Winds out of the SSW at 9 mph 15 km/h.

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Weather by the Numbers

Thu, 1st
Sinai SD Weather - Thursday, Oct 1, 2026 - Overcast
Hi: 66°F 19°C
Lo: 51°F 11°C
Sunrise 07:26 AM
Sunset 07:09 PM
Wind N 13 mph22 km/h
Dew Point 35°F1°C
uv Index 2
Barometric Pressure 30.06 in1018 mb
POP 10% *
Humidity 41%
Fri, 2nd
Sinai SD Weather - Friday, Oct 2, 2026 - Light Drizzle
Hi: 58°F 15°C
Lo: 41°F 5°C
Sunrise 07:27 AM
Sunset 07:07 PM
Wind ESE 8 mph13 km/h
Dew Point 39°F4°C
uv Index 1
Barometric Pressure 30.36 in1028 mb
POP 61% *
Humidity 84%
Sat, 3rd
Sinai SD Weather - Saturday, Oct 3, 2026 - Partly Cloudy
Hi: 66°F 19°C
Lo: 48°F 9°C
Sunrise 07:29 AM
Sunset 07:05 PM
Wind SW 14 mph23 km/h
Dew Point 45°F7°C
uv Index 4
Barometric Pressure 30.06 in1018 mb
POP 8% *
Humidity 58%
Sun, 4th
Sinai SD Weather - Sunday, Oct 4, 2026 - Partly Cloudy
Hi: 57°F 14°C
Lo: 46°F 8°C
Sunrise 07:30 AM
Sunset 07:03 PM
Wind NE 8 mph13 km/h
Dew Point 31°F-0°C
uv Index 3
Barometric Pressure 30.39 in1029 mb
POP 2% *
Humidity 41%
Mon, 5th
Sinai SD Weather - Monday, Oct 5, 2026 - Partly Cloudy
Hi: 57°F 14°C
Lo: 45°F 7°C
Sunrise 07:31 AM
Sunset 07:01 PM
Wind SE 14 mph22 km/h
Dew Point 32°F-0°C
uv Index 4
Barometric Pressure 30.27 in1025 mb
POP 4% *
Humidity 43%
Tue, 6th
Sinai SD Weather - Tuesday, Oct 6, 2026 - Overcast
Hi: 63°F 17°C
Lo: 48°F 9°C
Sunrise 07:32 AM
Sunset 07:00 PM
Wind SSW 20 mph32 km/h
Dew Point 46°F8°C
uv Index 3
Barometric Pressure 29.83 in1010 mb
POP 17% *
Humidity 66%
Wed, 7th
Sinai SD Weather - Wednesday, Oct 7, 2026 - Sunny
Hi: 66°F 19°C
Lo: 55°F 13°C
Sunrise 07:33 AM
Sunset 06:58 PM
Wind NW 9 mph14 km/h
Dew Point 28°F-2°C
uv Index 5
Barometric Pressure 30.03 in1017 mb
POP 2% *
Humidity 30%
Thu, 8th
Sinai SD Weather - Thursday, Oct 8, 2026 - Overcast
Hi: 60°F 16°C
Lo: 50°F 10°C
Sunrise 07:35 AM
Sunset 06:56 PM
Wind NE 16 mph26 km/h
Dew Point 37°F3°C
uv Index 3
Barometric Pressure 30.12 in1020 mb
POP 6% *
Humidity 59%
Fri, 9th
Sinai SD Weather - Friday, Oct 9, 2026 - Sunny
Hi: 50°F 10°C
Lo: 38°F 3°C
Sunrise 07:36 AM
Sunset 06:54 PM
Wind N 10 mph17 km/h
Dew Point 24°F-4°C
uv Index 3
Barometric Pressure 30.53 in1034 mb
POP 2% *
Humidity 48%
Sat, 10th
Sinai SD Weather - Saturday, Oct 10, 2026 - Sunny
Hi: 55°F 13°C
Lo: 40°F 5°C
Sunrise 07:37 AM
Sunset 06:52 PM
Wind S 16 mph26 km/h
Dew Point 26°F-4°C
uv Index 3
Barometric Pressure 30.24 in1024 mb
POP 1% *
Humidity 43%
Sun, 11th
Sinai SD Weather - Sunday, Oct 11, 2026 - Partly Cloudy
Hi: 66°F 19°C
Lo: 47°F 8°C
Sunrise 07:38 AM
Sunset 06:51 PM
Wind NNW 10 mph15 km/h
Dew Point 35°F2°C
uv Index 4
Barometric Pressure 29.94 in1014 mb
POP 8% *
Humidity 43%
Mon, 12th
Sinai SD Weather - Monday, Oct 12, 2026 - Cloudy
Hi: 67°F 20°C
Lo: 46°F 8°C
Sunrise 07:40 AM
Sunset 06:49 PM
Wind W 18 mph30 km/h
Dew Point 35°F2°C
uv Index 4
Barometric Pressure 29.65 in1004 mb
POP 7% *
Humidity 35%
Tue, 13th
Sinai SD Weather - Tuesday, Oct 13, 2026 - Overcast
Hi: 50°F 10°C
Lo: 38°F 4°C
Sunrise 07:41 AM
Sunset 06:47 PM
Wind ESE 18 mph29 km/h
Dew Point 29°F-2°C
uv Index 2
Barometric Pressure 30.27 in1025 mb
POP 7% *
Humidity 59%
Wed, 14th
Sinai SD Weather - Wednesday, Oct 14, 2026 - Sunny
Hi: 58°F 15°C
Lo: 42°F 6°C
Sunrise 07:42 AM
Sunset 06:45 PM
Wind SSW 9 mph15 km/h
Dew Point 26°F-4°C
uv Index 4
Barometric Pressure 30.18 in1022 mb
POP 1% *
Humidity 39%
* POP = Probability of Precipitation. Data for 12:00 PM.