Weather forecast for 10 daysKeystone, SD
Weather forecast for the weekend
Sunday Oct 18, 2026
- 64°F
- 36°F
Sunny
- Precip. probability: 0%
- Precipitation: 0"
- Wind: 11mphNNE 13°
- Humidity: 34%
- UV index: 3
- Sunrise: 7:12 am MDT
- Sunset: 6:05 pm MDT
- details ▼
Tomorrow, expect consistent sunshine and open skies.
Significant variations in temperature are forecasted, peaking at a breezy 64.4°F and dropping to a low of a cold 35.6°F.
The day's peak of 64.4°F reflects September's seasonal pattern more than October's.
Sunrise will be at 7:12 am and sunset at 6:05 pm; tomorrow's daylight will last for 10h and 53min.
Significant variations in temperature are forecasted, peaking at a breezy 64.4°F and dropping to a low of a cold 35.6°F.
The day's peak of 64.4°F reflects September's seasonal pattern more than October's.
Sunrise will be at 7:12 am and sunset at 6:05 pm; tomorrow's daylight will last for 10h and 53min.
10-day overview
Daily temperatures
Maximum temperature: 73°C.
Coldest day: Saturday 24.10. 54°C.
Coldest day: Saturday 24.10. 54°C.
Chance of precipitation
Highest chance: Saturday 24.10. 33%.
Long-term weather forecast
- Saturday
- Oct 17, 2026
- min.
- 50°F
Clear
- Precip. probability: 0%
- Precipitation: 0"
- Wind: 9mphWNW 299°
- Humidity: 36%
- UV index: 0
- Sunrise: 7:11 am MDT
- Sunset: 6:06 pm MDT
- details ▼
- Sunday
- Oct 18, 2026
- 64°F
- 36°F
Sunny
- Precip. probability: 0%
- Precipitation: 0"
- Wind: 11mphNNE 13°
- Humidity: 34%
- UV index: 3
- Sunrise: 7:12 am MDT
- Sunset: 6:05 pm MDT
- details ▼
- Monday
- Oct 19, 2026
- 61°F
- 45°F
Sunny
- Precip. probability: 2%
- Precipitation: 0"
- Wind: 9mphSSE 160°
- Humidity: 48%
- UV index: 3
- Sunrise: 7:13 am MDT
- Sunset: 6:03 pm MDT
- details ▼
- Tuesday
- Oct 20, 2026
- 73°F
- 46°F
Sunny
- Precip. probability: 0%
- Precipitation: 0"
- Wind: 7mphWSW 237°
- Humidity: 38%
- UV index: 3
- Sunrise: 7:14 am MDT
- Sunset: 6:02 pm MDT
- details ▼
- Wednesday
- Oct 21, 2026
- 68°F
- 48°F
Sunny
- Precip. probability: 1%
- Precipitation: 0"
- Wind: 7mphE 93°
- Humidity: 45%
- UV index: 3
- Sunrise: 7:16 am MDT
- Sunset: 6:00 pm MDT
- details ▼
- Thursday
- Oct 22, 2026
- 73°F
- 55°F
Partly Cloudy
- Precip. probability: 1%
- Precipitation: 0"
- Wind: 11mphSSW 208°
- Humidity: 46%
- UV index: 3
- Sunrise: 7:17 am MDT
- Sunset: 5:58 pm MDT
- details ▼
- Friday
- Oct 23, 2026
- 72°F
- 45°F
Partly Cloudy
- Precip. probability: 23%
- Precipitation: 0.2"
- Wind: 11mphSW 233°
- Humidity: 50%
- UV index: 3
- Sunrise: 7:18 am MDT
- Sunset: 5:57 pm MDT
- details ▼
- Saturday
- Oct 24, 2026
- 54°F
- 37°F
AM Showers
- Precip. probability: 33%
- Precipitation: 0.04"
- Wind: 9mphNW 323°
- Humidity: 58%
- UV index: 3
- Sunrise: 7:19 am MDT
- Sunset: 5:55 pm MDT
- details ▼
- Sunday
- Oct 25, 2026
- 59°F
- 43°F
Mostly Sunny
- Precip. probability: 7%
- Precipitation: 0"
- Wind: 9mphS 191°
- Humidity: 57%
- UV index: 3
- Sunrise: 7:21 am MDT
- Sunset: 5:54 pm MDT
- details ▼
- Monday
- Oct 26, 2026
- 59°F
- 43°F
Partly Cloudy
- Precip. probability: 15%
- Precipitation: 0"
- Wind: 8mphS 177°
- Humidity: 56%
- UV index: 3
- Sunrise: 7:22 am MDT
- Sunset: 5:52 pm MDT
- details ▼
Looking ahead, conditions suggest a period of bright, overcast and damp weather is expected.
Rainfall is expected on Friday and next Saturday.
Significant changes in temperature are expected throughout the forecast window. The maximum temperature will vary between 53.6°F and 73.4°F, while the lowest night temperatures will vary also significantly, as nighttime lows are forecast to fall between 35.6°F and 55.4°F.
Tuesday and Thursday, with the highest temperature of 73.4°F, will be the warmest days; expect the coldest day on next Saturday with a high of 53.6°F.
Rainfall is expected on Friday and next Saturday.
Significant changes in temperature are expected throughout the forecast window. The maximum temperature will vary between 53.6°F and 73.4°F, while the lowest night temperatures will vary also significantly, as nighttime lows are forecast to fall between 35.6°F and 55.4°F.
Tuesday and Thursday, with the highest temperature of 73.4°F, will be the warmest days; expect the coldest day on next Saturday with a high of 53.6°F.
Updated: Oct 18, 2026 @ 04:13:49 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
Tomorrow, sunny and dry conditions are anticipated.
Tomorrow, the maximum temperature will be 64.4°F, while the minimum temperature will be 35.6°F.
The maximum temperature will be significantly higher than the average highest temperature of 54°F in October. The lowest temperature will be in line with the average low of 36.7°F.
The maximum temperature will be significantly higher than the average highest temperature of 54°F in October. The lowest temperature will be in line with the average low of 36.7°F.
On Sunday, in Keystone, sunrise will be at 7:12 am and sunset at 6:05 pm (MDT).
In Keystone, South Dakota, tomorrow, there will be 10h and 53min of daylight.
