St. Louis is under a heat advisory with high temperatures and humidity; NWS urges precautions against heat-related illnesses and offers advice on keeping safe.

Heat advisory in effect in Northeast and Northern Florida, and Southeast Georgia with heat index values up to 112 degrees. NWS advises caution to prevent heat-related illnesses.

Baltimore experiences a slight break from its typical summer heat and humidity due to a weak front and high pressure, with mostly sunny days and normal temperatures ahead.

Mixed weather is expected in Atlanta, with sunny days and chances of thunderstorms, especially in the afternoons. Highs near 90s, with lows in the mid-70s.

Updated Philadelphia weather forecast shows mostly sunny skies and highs up to 88°F today, with a slight chance of showers and thunderstorms Sunday night, and a 20% chance of precipitation on Monday and Monday night.

The National Weather Service forecasts scattered showers, thunderstorms, and a heatwave for Indianapolis, with temperatures soaring into the 90s and varied chances of precipitation throughout the week.

Charlotte, NC is set to experience a mix of sunshine and potential showers, with mostly sunny skies today and a slight chance of thunderstorms. The rest of the week will see sunny to partly cloudy days and occasional chances of rain.

Seattle anticipates heavy weekend rain, with the National Weather Service predicting up to 1.5 inches in lowlands and 3-5 inches in mountains, raising flood and runoff concerns.

The NWS San Francisco forecasts strong northwest winds for the Bay Area with gusts up to 40 mph. A "Moderate HeatRisk" is also expected in interior regions, with varied weather including potential precipitation by Saturday.

Chicago anticipates a heatwave with temperatures potentially reaching 92 degrees, while chances of showers and thunderstorms may offer relief; August has seen lower than usual rainfall.

Increased trade winds and showers are expected in Honolulu due to a trough and remnants of Tropical Cyclone Ivo, with a return to drier conditions by Tuesday.

The National Weather Service warns of possible isolated thunderstorms in eastern Mohave County, with drier conditions expected for the weekend and warmer temperatures later in the week.

The National Weather Service predicts typical coastal weather for Los Angeles, with morning clouds and fog followed by clear, sunny afternoons and mild evenings.