Weather forecast for tomorrowSinai, SD
Weather forecast for tomorrow
Monday Oct 19, 2026
- 66°F
- 41°F
Sunny
- Precip. probability: 5%
- Precipitation: 0"
- Wind: 11mphE 98°
- Humidity: 60%
- UV index: 3
- Sunrise: 7:48 am CDT
- Sunset: 6:37 pm CDT
- details ▼
Tomorrow, in Sinai, expect sunny weather with a crisp, clear sky.
Temperature is predicted to swing from a high of an enjoyable 66.2°F to a low of a wintry 41°F.
The temperature of 66.2°F aligns more with what is typical in September than what is normal in October.
Sunrise will be at 7:48 am and sunset at 6:37 pm; tomorrow's daylight will last for 10h and 49min.
Temperature is predicted to swing from a high of an enjoyable 66.2°F to a low of a wintry 41°F.
The temperature of 66.2°F aligns more with what is typical in September than what is normal in October.
Sunrise will be at 7:48 am and sunset at 6:37 pm; tomorrow's daylight will last for 10h and 49min.
Hourly overview
Hourly temperatures
Warmest hour: 3 pm 64°C.
Coldest hour: 6 am 39°C.
Coldest hour: 6 am 39°C.
Chance of precipitation
Highest chance: 3 am - 6 am 4%.
Hourly weather forecast
- 12 am
- 45°F
- Feels like:43°F
Partly Cloudy
- Precip. probability: 3%
- Precipitation: 0"
- Wind: 4mphENE 68°
- Humidity: 81%
- Pressure: 30.18"Hg
- Visibility: 10mi
- UV index: 0
- details ▼
- 2 am
- 43°F
- Feels like:39°F
Partly Cloudy
- Precip. probability: 4%
- Precipitation: 0"
- Wind: 5mphNE 45°
- Humidity: 87%
- Pressure: 30.21"Hg
- Visibility: 10mi
- UV index: 0
- details ▼
- 4 am
- 41°F
- Feels like:36°F
Partly Cloudy
- Precip. probability: 4%
- Precipitation: 0"
- Wind: 6mphNE 48°
- Humidity: 89%
- Pressure: 30.21"Hg
- Visibility: 10mi
- UV index: 0
- details ▼
- 6 am
- 39°F
- Feels like:36°F
Partly Cloudy
- Precip. probability: 4%
- Precipitation: 0"
- Wind: 7mphNE 49°
- Humidity: 89%
- Pressure: 30.24"Hg
- Visibility: 10mi
- UV index: 0
- details ▼
Sunrise: 7:48 am
- 8 am
- 41°F
- Feels like:36°F
Mostly Sunny
- Precip. probability: 5%
- Precipitation: 0"
- Wind: 7mphNE 53°
- Humidity: 88%
- Pressure: 30.27"Hg
- Visibility: 10mi
- UV index: 0
- details ▼
- 10 am
- 48°F
- Feels like:45°F
Sunny
- Precip. probability: 2%
- Precipitation: 0"
- Wind: 8mphENE 78°
- Humidity: 73%
- Pressure: 30.27"Hg
- Visibility: 10mi
- UV index: 1
- details ▼
- 12 pm
- 59°F
- Feels like:57°F
Sunny
- Precip. probability: 0%
- Precipitation: 0"
- Wind: 9mphE 96°
- Humidity: 54%
- Pressure: 30.24"Hg
- Visibility: 10mi
- UV index: 3
- details ▼
- 2 pm
- 63°F
- Feels like:63°F
Sunny
- Precip. probability: 0%
- Precipitation: 0"
- Wind: 10mphESE 117°
- Humidity: 44%
- Pressure: 30.18"Hg
- Visibility: 10mi
- UV index: 3
- details ▼
- 4 pm
- 64°F
- Feels like:63°F
Sunny
- Precip. probability: 0%
- Precipitation: 0"
- Wind: 10mphSE 127°
- Humidity: 44%
- Pressure: 30.15"Hg
- Visibility: 10mi
- UV index: 1
- details ▼
- 6 pm
- 61°F
- Feels like:59°F
Sunny
- Precip. probability: 0%
- Precipitation: 0"
- Wind: 8mphSE 127°
- Humidity: 51%
- Pressure: 30.18"Hg
- Visibility: 10mi
- UV index: 0
- details ▼
Sunset: 6:37 pm
- 8 pm
- 54°F
- Feels like:52°F
Clear
- Precip. probability: 2%
- Precipitation: 0"
- Wind: 6mphSE 124°
- Humidity: 65%
- Pressure: 30.18"Hg
- Visibility: 10mi
- UV index: 0
- details ▼
- 10 pm
- 48°F
- Feels like:46°F
Clear
- Precip. probability: 4%
- Precipitation: 0"
- Wind: 6mphSE 126°
- Humidity: 77%
- Pressure: 30.21"Hg
- Visibility: 10mi
- UV index: 0
- details ▼
Tomorrow, a combination of clear and cloudy weather is anticipated.
The temperature will be between the lowest temperature of 39.2°F and the highest temperature of 64.4°F. The warmest part of the day will be at 3 pm and 4 pm.
The highest temperature is more in line with September's average maximum of 72.5°F than October's usual of 55.6°F. The expected low will be similar to the average minimum in October, which is 39.6°F.
The temperature will be between the lowest temperature of 39.2°F and the highest temperature of 64.4°F. The warmest part of the day will be at 3 pm and 4 pm.
The highest temperature is more in line with September's average maximum of 72.5°F than October's usual of 55.6°F. The expected low will be similar to the average minimum in October, which is 39.6°F.
Updated: Oct 18, 2026 @ 17:05:42 UTC
Published by: Weather U.S. | About Us
Data Sources | weather.com | Weather
Weather Forecasting & Climate
Published by: Weather U.S. | About Us
Data Sources | weather.com | Weather
Weather Forecasting & Climate
Frequently asked questions
On Monday, the forecast calls for abundant sunshine.
Tomorrow, the highest temperature will be 66.2°F, while the lowest temperature will be 41°F.
The maximum temperature will be notably higher than the average highest temperature of 55.6°F in October. The lowest temperature will be in line with the average low of 39.6°F.
The maximum temperature will be notably higher than the average highest temperature of 55.6°F in October. The lowest temperature will be in line with the average low of 39.6°F.
On Monday, in Sinai, sunrise will be at 7:48 am and sunset at 6:37 pm (CDT).
In Sinai, South Dakota, the length of the day tomorrow will be 10h and 49min.
