Hour-by-Hour to Feels Like 109 Degrees: Washington, DC Weather Forecast

WASHINGTON, D.C. — Residents will be asked again to stay in air-conditioned environments and in the shade when outside for another day. The heat index, or "feels like" temperature across the region could hit 110 degrees on Sunday.

An excessive heat warning is in effect from noon until 8 p.m. for Washington, D.C. An excessive heat warning means a prolonged period of dangerously high temperatures is forecasted, with heat stroke and other heat-related illnesses expected.

The heat index is expected to hit 100 degrees by 11 a.m. and reach up to 109 degrees by 4 p.m., according to the weather service. Unlike Saturday's heat, with dangerous temps lingering into the night, Sunday's forecast has temperatures dropping near sunset.

Here's the hour-by-hour timeline for the heat index:

10 a.m.: 98 degrees
11 a.m.: 100 degrees
noon: 102 degrees
1 p.m.: 103 degrees
2 p.m: 105 degrees
3 p.m.: 107 degrees
4 p.m.: 109 degrees
5 p.m.: 105 degrees
6 p.m.: 102 degrees
7 p.m.: 100 degrees
8 p.m.: 98 degrees

Heat tips include:

• Rescheduling strenuous activity to early morning or evening
• Knowing the signs and symptoms of heat exhaustion and heat stroke
• Wearing light and loose fitting clothing
• Drinking plenty of water

Those working outside should take frequent breaks in the shade or in an air-conditioned environment. "Heat stroke is an emergency - call 911," the weather service warns.

The forecast for the start of the week has the heat index reaching 100 degrees on Monday and 99 degrees on Tuesday. The temperatures start cooling slightly on Wednesday and the high will be around 90 degrees by the weekend.

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