It may be November on the calendar but there's a nip of September in the air.

What happened to October? It was the warmest one on record, capped by a record-setting 73 degrees yesterday.

An errant jet stream that should be pushing cooler air into the Washington area has stopped for a visit in the Great Lakes region and fall remains stalled in Canada.

"Most of the cold air that we usually see around this time is still north of us," National Weather Service meteorologist Larry Wenzel said yesterday. "The winds are steering the cold air away from us and I don't see any substantially cold weather heading our way any time soon."

Weather service officials said all the season-shuffling has caused above-normal temperatures here every day since Oct. 8, including four days that saw highs in the 80s.

Wenzel predicted that the warm temperatures could linger through November.

Showers are expected today and tomorrow, today's high should be about 70 degrees and temperatures are forecast to dip into the low 50s tonight. The high tomorrow should be 60 to 65, the weather service said.

Yesterday's balmy weather, tempered by light breezes, meant trick-or-treaters could show all their finery, unencumbered by long coats and other dispiriting outerwear.

But the warm temperatures weren't universally welcomed.

"Popcorn sells better in cool weather," said sidewalk vendor Jerome Coleman, sporting a short-sleeved shirt.

"People are beginning to think it is going to stay warm all year," said Coleman. "But I guess I'm doing all right as long as a lot of people are getting out for lunch."

John Russell, who sells fruit from a vending stand at 15th and L streets NW, took a different view.

"If it's nice outside, people will buy, if it isn't I'm out of business," said Russell. "I'm from Minneapolis and the winters are tough. But if it stays this warm until the end of November, working out here will be a piece of cake."

"I like this weather, and it will be wonderful for my electric bill," said Sheila McGovern, taking a break from work to sit in McPherson Square.

Metro bus driver Teddy Lane said, "I don't care for it. . . . but the passengers love it. . . .I feel because it has been this warm, we have missed out on fall."

Fall is expected to appear briefly over the weekend, with high temperatures in the 50s. But don't expect it to stick around.

Overall, the November forecast is likely to be above normal, but we may see some lows in the 40s, meteorologist Wenzel said.

"It's like putting one foot in a bucket of cold water and the other in a bucket of hot water," he said. "It could get a little uncomfortable."