Historic heat: D.C. could top 100 for a record-tying third straight day
The ongoing heat wave in Washington has already made history and is on the brink of making more.The District has a strong chance to reach 101 degrees or higher for a third straight day on Tuesday, matching the longest such streak on record.On Sunday, temperatures soared to a record of 101, and on Monday they reached a record 102.The National Weather Service is predicting another high of 101 on Tuesday, while an average of computer models projects 103. In records dating to the late 1800s, only 1930 produced three days in a row at 101 or higher.Factoring in the humidity, it will feel as hot as 105 to 110, prompting an excessive-heat warning from the Weather Service for a second day in a row.While highs in the low 100s are probable on Tuesday, reaching the July 16 record of 104 set in 1988 is a bit of a stretch.There have only been 12 days in Washington weather history with high temperatures of 104 or higher. The all-time maximum of 106 occurred in 1918 and 1930.The recent flurry of 100-degree days marks a sudden change from recent summers. The District had gone nearly eight years without reaching 100 until June 22, when it finally touched the century mark. This summer, only about half over, has seen three days reach the triple digits, and Tuesday will probably bring a fourth.There’s even an outside chance that it hits 100 (or higher) again on Wednesday for a fourth day in a row. A four-day streak at or above 100 would match the longest on record.These multiple 100-degree days have contributed to the District’s hottest first half of summer on record. Here are the most impressive heat benchmarks reached so far:With an average temperature of 81.5, this summer is the hottest on record to date, surpassing 80.9 in 2010.The 28 days at or above 90 degrees thus far is 10 above average and more like the number typically expected around Aug. 6. There were 32 days at or above 90 all year in 2023.D.C. has reached 98 or higher on nine days. The most on record in a summer was 15 days in 1930, followed by 14 as recently as 2012.Record warm lows were set Sunday and Monday at 79 and 81, respectively. Those followed two others in July, two in June and two in May. There have been no records for cold this year.The six excessive-heat warnings issued by the Weather Service so far this July are the most on record in a month since at least 2006, according to statistics from the Iowa Environmental Mesonet. An excessive-heat warning is issued when heat indexes near or above 110 are expected.D.C.’s highest heat index so far this summer is 111.Six days have had lows of 80 or higher this year, including Monday, second-most on record. The annual record is seven, set in 2016 and 2011. If Tuesday’s low temperature stays at or above 80 through midnight, 2024 will move into a tie with 2016 and 2011.When will the heat wave end?After a cold front sweeps through the region late Wednesday, temperatures will return closer to normal Thursday through Saturday. Temperatures may rise some after that, but there are no immediate signs of more triple-digit heat. Forecast highs between Sunday and early next week are mostly in the lows 90s.D.C.’s average high is 90 for another 10 days before it begins to drop. August — on average — is a somewhat cooler month than July. But the first half of the month, in particular, is known to sometimes produce punishing heat waves.The ongoing blast of heat will end up shorter than some we’ve already experienced this summer, but its intensity is unmatched. The Climate Shift Index from Climate Central, a science communication firm, indicates that human-caused climate change has made the heat three to five times more probable.Jason Samenow contributed to this report.
Not until Thursday will there be significant relief.

The ongoing heat wave in Washington has already made history and is on the brink of making more.
The District has a strong chance to reach 101 degrees or higher for a third straight day on Tuesday, matching the longest such streak on record.
On Sunday, temperatures soared to a record of 101, and on Monday they reached a record 102.
The National Weather Service is predicting another high of 101 on Tuesday, while an average of computer models projects 103. In records dating to the late 1800s, only 1930 produced three days in a row at 101 or higher.
Factoring in the humidity, it will feel as hot as 105 to 110, prompting an excessive-heat warning from the Weather Service for a second day in a row.
While highs in the low 100s are probable on Tuesday, reaching the July 16 record of 104 set in 1988 is a bit of a stretch.
There have only been 12 days in Washington weather history with high temperatures of 104 or higher. The all-time maximum of 106 occurred in 1918 and 1930.
The recent flurry of 100-degree days marks a sudden change from recent summers. The District had gone nearly eight years without reaching 100 until June 22, when it finally touched the century mark. This summer, only about half over, has seen three days reach the triple digits, and Tuesday will probably bring a fourth.
There’s even an outside chance that it hits 100 (or higher) again on Wednesday for a fourth day in a row. A four-day streak at or above 100 would match the longest on record.
These multiple 100-degree days have contributed to the District’s hottest first half of summer on record. Here are the most impressive heat benchmarks reached so far:
- With an average temperature of 81.5, this summer is the hottest on record to date, surpassing 80.9 in 2010.
- The 28 days at or above 90 degrees thus far is 10 above average and more like the number typically expected around Aug. 6. There were 32 days at or above 90 all year in 2023.
- D.C. has reached 98 or higher on nine days. The most on record in a summer was 15 days in 1930, followed by 14 as recently as 2012.
- Record warm lows were set Sunday and Monday at 79 and 81, respectively. Those followed two others in July, two in June and two in May. There have been no records for cold this year.
- The six excessive-heat warnings issued by the Weather Service so far this July are the most on record in a month since at least 2006, according to statistics from the Iowa Environmental Mesonet. An excessive-heat warning is issued when heat indexes near or above 110 are expected.
- D.C.’s highest heat index so far this summer is 111.
- Six days have had lows of 80 or higher this year, including Monday, second-most on record. The annual record is seven, set in 2016 and 2011. If Tuesday’s low temperature stays at or above 80 through midnight, 2024 will move into a tie with 2016 and 2011.
When will the heat wave end?
After a cold front sweeps through the region late Wednesday, temperatures will return closer to normal Thursday through Saturday. Temperatures may rise some after that, but there are no immediate signs of more triple-digit heat. Forecast highs between Sunday and early next week are mostly in the lows 90s.
D.C.’s average high is 90 for another 10 days before it begins to drop. August — on average — is a somewhat cooler month than July. But the first half of the month, in particular, is known to sometimes produce punishing heat waves.
The ongoing blast of heat will end up shorter than some we’ve already experienced this summer, but its intensity is unmatched. The Climate Shift Index from Climate Central, a science communication firm, indicates that human-caused climate change has made the heat three to five times more probable.
Jason Samenow contributed to this report.