The salt in your diet and in processed foods should be adequate. Do NOT leave children or pets in a closed car. Temperatures can soar to killer levels within just a few minutes in a car that is in the sun. Take showers to cool down and use soap to remove skin oils that can block pores and hinder the natural cooling process of sweating. Use awnings, draperies, and blinds to keep direct sunlight from heating up the interior of your home.
Storm windows can provide insulation from summer heat as well as winter cold.
Check on the elderly and those with health problems to make sure they are okay. Be aware of ozone and air pollution advisories which tend to worsen as temperatures rise. Avoid outdoor activity when ozone levels are high. Sunburn reduces the skin's ability to release excess heat, making the body more susceptible to heat-related illness. Infants and children are particularly susceptible.