The heat index will remain above 90 degrees even after the sun goes down tonight, the weather service said.

When the heat index gets above 100, people stay away.

Outside the city, the heat index was 105 or more.

The temperature is 95 degrees with a heat index of 114, well beyond the dangerous range.

With thermometers expected to hit 100 or higher today, the heat index in the park could reach 120.

The policy allows men's and women's players to request a 10-minute break if the heat index goes above 90 degrees.

Over the July 4 weekend, the heat index was 108 to 110.

They played before a crowd of 6,300 on a court where the temperature reached 105 degrees and the heat index 115.

That means heat indexes are expected to be above 105.

The rule for days with a heat index more than 90 is to give players a 10-minute break between the second and third sets.