Because a wave of sweltering weather this weekend, race organizers last week moved up the times of various events.

It’s expected to be unseasonably warm when thousands of runners hit the streets. Here’s what to expect and where to look out for road closures.

Excitement builds in Long Beach as 22,000 runners gear up for the 40th Long Beach Marathon, but with soaring temperatures expected, organizers have adjusted race times and implemented extra safety measures to ensure a smooth and safe event.

Long Beach is expected to warm up this week, starting on Wednesday, Oct. 2 — with highs in the upper 90s in some parts of the city expected, according to a recent city news release. The heat, with temperatures in the upper 80s and low 90s, is expected to last through the weekend.

Underway this morning, heat became a big factor of the 40th annual Long Beach marathon. Races started half an hour early due to concerns about the heat on the beach.