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Heap Lake, SD Weather Forecast
Heap Lake, SD Weather Forecast Dated: 634 AM Fri Aug 21 2026 (Heap Lake Time)
Fri, 21st Lo: 17°C62°F Hi: 33°C92°F |
Sunny Friday, temperatures as high as 92°F33°C, low temperature around 62°F17°C, chance of rain 1%, wind out of the ENE 10 mph17 km/h. Barometric pressure 29.94 in1014 mb, visibility 6 mi10 km, humidity 44%. |
| Sat, 22nd Lo: 17°C63°F Hi: 28°C83°F |
Sunny Saturday, temperatures as high as 83°F28°C, low temperature around 63°F17°C, chance of rain 3%, wind out of the E 13 mph21 km/h. Barometric pressure 30.06 in1018 mb, visibility 6 mi10 km, humidity 41%. |
Sun, 23rd Lo: 18°C64°F Hi: 29°C84°F |
Overcast Sunday, temperatures as high as 84°F29°C, low temperature around 64°F18°C, chance of rain 57%, wind out of the SE 21 mph34 km/h. Barometric pressure 29.91 in1013 mb, visibility 6 mi10 km, humidity 52%. |
| Mon, 24th Lo: 18°C64°F Hi: 32°C89°F |
Sunny Monday, temperatures as high as 89°F32°C, low temperature around 64°F18°C, chance of rain 57%, wind out of the ESE 17 mph28 km/h. Barometric pressure 29.83 in1010 mb, visibility 6 mi10 km, humidity 57%. |
| Tue, 25th Lo: 21°C70°F Hi: 30°C86°F |
Overcast Tuesday, temperatures as high as 86°F30°C, low temperature around 70°F21°C, chance of rain 57%, wind out of the NW 12 mph19 km/h. Barometric pressure 29.91 in1013 mb, visibility 6 mi10 km, humidity 38%. |
| Wed, 26th Lo: 22°C71°F Hi: 32°C89°F |
Sunny Wednesday, temperatures as high as 89°F32°C, low temperature around 71°F22°C, chance of rain 1%, wind out of the E 9 mph15 km/h. Barometric pressure 29.91 in1013 mb, visibility 6 mi10 km, humidity 32%. |
| Thu, 27th Lo: 24°C76°F Hi: 39°C102°F |
Sunny Thursday, temperatures as high as 102°F39°C, low temperature around 76°F24°C, chance of rain 3%, wind out of the SSE 21 mph34 km/h. Barometric pressure 29.71 in1006 mb, visibility 6 mi10 km, humidity 39%. |
| Fri, 28th Lo: 28°C82°F Hi: 36°C96°F |
Overcast Friday, temperatures as high as 96°F36°C, low temperature around 82°F28°C, chance of rain 7%, wind out of the W 19 mph30 km/h. Barometric pressure 29.68 in1005 mb, visibility 6 mi10 km, humidity 28%. |
| Sat, 29th Lo: 24°C74°F Hi: 31°C88°F |
Overcast Saturday, temperatures as high as 88°F31°C, low temperature around 74°F24°C, chance of rain 6%, wind out of the ENE 10 mph16 km/h. Barometric pressure 30 in1016 mb, visibility 6 mi10 km, humidity 19%. |
| Sun, 30th Lo: 22°C72°F Hi: 36°C97°F |
Sunny Sunday, temperatures as high as 97°F36°C, low temperature around 72°F22°C, chance of rain 57%, wind out of the S 22 mph36 km/h. Barometric pressure 29.83 in1010 mb, visibility 6 mi10 km, humidity 29%. |
| Mon, 31st Lo: 25°C77°F Hi: 36°C98°F |
Sunny Monday, temperatures as high as 98°F36°C, low temperature around 77°F25°C, chance of rain 17%, wind out of the W 16 mph25 km/h. Barometric pressure 29.65 in1004 mb, visibility 6 mi10 km, humidity 30%. |
| Tue, 1st Lo: 22°C72°F Hi: 30°C85°F |
Overcast Tuesday, temperatures as high as 85°F30°C, low temperature around 72°F22°C, chance of rain 6%, wind out of the NE 11 mph18 km/h. Barometric pressure 29.91 in1013 mb, visibility 6 mi10 km, humidity 21%. |
| Wed, 2nd Lo: 18°C65°F Hi: 30°C86°F |
Overcast Wednesday, temperatures as high as 86°F30°C, low temperature around 65°F18°C, chance of rain 36%, wind out of the ESE 19 mph31 km/h. Barometric pressure 30 in1016 mb, visibility 6 mi10 km, humidity 34%. |
Thu, 3rd Lo: 15°C58°F Hi: 31°C88°F |
Partly Cloudy Thursday, temperatures as high as 88°F31°C, low temperature around 58°F15°C, chance of rain 36%, wind out of the E 21 mph33 km/h. Barometric pressure 29.8 in1009 mb, visibility 6 mi10 km, humidity 48%. |
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