With above average temperatures expected this weekend, the County of San Bernardino Health Officer Dr. Maxwell Ohikhuare has issued a heat advisory. Temperatures will peak on Friday 10 to 20 degrees above normal for this time of year, with very slight cooling Saturday through Sunday. With above average temperatures expected this weekend, the County of San Bernardino Health Officer Dr. Maxwell Ohikhuare has issued a heat advisory. Temperatures will peak on Friday 10 to 20 degrees above normal for this time of year, with very slight cooling Saturday through Sunday. View the Press Release. Ver en español.