SXUS73 KFSD 200832 RERFSD RECORD EVENT REPORT NATIONAL WEATHER SERVICE SIOUX FALLS SD 332 AM CDT MON SEP 20 2021 ...RECORD HIGH MINIMUM TEMPERATURE TIED AT SIOUX FALLS SD... A RECORD HIGH MINIMUM TEMPERATURE OF 70 DEGREES WAS TIED AT JOE FOSS FIELD IN SIOUX FALLS SOUTH DAKOTA SUNDAY, SEPTEMBER 19TH. THIS TIES THE OLD RECORD OF 70 DEGREES SET IN 1940. $$ AT