Weather forecast for: Keystone SD
Last Update: 5:26 pm MST Nov 1, 2026
Tonight: Areas of drizzle with a chance of rain before 8pm, then rain likely with areas of drizzle between 8pm and 11pm, then rain after 11pm. Patchy fog. Low around 48. Light and variable wind becoming north 5 to 7 mph after midnight. Winds could gust as high as 26 mph. Chance of precipitation is 100%.
Monday: Rain. Temperature rising to near 49 by 9am, then falling to around 41 during the remainder of the day. Breezy, with a northwest wind 13 to 20 mph, with gusts as high as 47 mph. Chance of precipitation is 90%.
Monday Night: Rain before 1am, then a chance of rain and snow. Low around 35. Northwest wind 13 to 17 mph, with gusts as high as 49 mph. Chance of precipitation is 80%. Little or no snow accumulation expected.
Tuesday: Mostly cloudy, then gradually becoming sunny, with a high near 51. Northwest wind 5 to 10 mph, with gusts as high as 31 mph.
Tuesday Night: Mostly clear, with a low around 34. Northwest wind around 6 mph becoming calm after midnight. Winds could gust as high as 17 mph.
Wednesday: Mostly sunny, with a high near 53. North wind around 5 mph becoming calm in the afternoon. Winds could gust as high as 15 mph.
Wednesday Night: Partly cloudy, with a low around 34.
Thursday: Mostly sunny, with a high near 54.
Thursday Night: Partly cloudy, with a low around 35.
Friday: Mostly sunny, with a high near 55.
Friday Night: A slight chance of rain. Partly cloudy, with a low around 37.
Saturday: A slight chance of rain and snow. Mostly sunny, with a high near 50.
Saturday Night: Partly cloudy, with a low around 36.
Sunday: Sunny, with a high near 57.