Sinai, SD Weather Forecast
Local 7-day forecast
Rain Showers then Mostly Sunny
Track current conditions, temperature changes, wind, and the full daily outlook for Sinai, SD in one place.
Rain showers before 7am. Mostly sunny, with a high near 86. South wind 10 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 80%.
Local Weather Overview
This forecast page for Sinai, SD is designed for quick trip planning, giving you a clean read on daytime highs, overnight lows, and changing conditions across the upcoming forecast window. Latest sync: Aug 27, 2026 6:51 AM CDT.
The active forecast window currently covers Aug 29 to Sep 2, 2026 for Sinai, SD.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Aug 29 to Sep 2, 2026
- Latest sync
- Aug 27, 2026 6:51 AM CDT
- Forecast office
- FSD
- Source
- NOAA / NWS
Daily Outlook
This Week in Sinai
Saturday looks like the warmest upcoming period in Sinai at 86 degrees F.
Monday Night is the coolest period ahead with temperatures near 62 degrees F.
The strongest winds are forecast for Saturday at about 10 to 20 mph S.
Precipitation is mentioned in 5 upcoming forecast periods.
Forecast Details
- Last updated
- Aug 27, 2026 6:51 AM CDT
- Coverage
- 5 days
- Time zone
- America/Chicago
- Forecast office
- FSD
- Radar station
- KFSD
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
Partly cloudy, with a low around 68.
Mostly sunny, with a high near 86.
Partly cloudy, with a low around 65.
A slight chance of showers and thunderstorms between 7am and 1pm. Mostly sunny, with a high near 84.
A slight chance of rain showers between 7pm and 1am. Partly cloudy, with a low around 62.
Mostly sunny, with a high near 83.
A slight chance of showers and thunderstorms after 7pm. Partly cloudy, with a low around 63.
A slight chance of showers and thunderstorms before 1pm. Mostly sunny, with a high near 85.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Saturday
Aug 29
|
Rain Showers then Mostly Sunny
|
86°F |
10 to 20 mph
S
|
|
Saturday Night
Aug 29
|
Partly Cloudy
|
68°F |
5 to 10 mph
SSE
|
|
Sunday
Aug 30
|
Mostly Sunny
|
86°F |
10 to 15 mph
SSE
|
|
Sunday Night
Aug 30
|
Partly Cloudy
|
65°F |
5 to 10 mph
SW
|
|
Monday
Aug 31
|
Slight Chance Showers And Thunderstorms
|
84°F |
10 mph
NNW
|
|
Monday Night
Aug 31
|
Slight Chance Rain Showers
|
62°F |
5 to 10 mph
NE
|
|
Tuesday
Sep 1
|
Mostly Sunny
|
83°F |
5 to 10 mph
ESE
|
|
Tuesday Night
Sep 1
|
Slight Chance Showers And Thunderstorms
|
63°F |
5 to 10 mph
SE
|
|
Wednesday
Sep 2
|
Slight Chance Showers And Thunderstorms
|
85°F |
5 to 15 mph
S
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Sinai.