Here's a recap of what happened during the 127th Boston Marathon

Thousands of athletes trekked the historic 26.2 miles from Hopkinton to downtown Boston to complete the 127th Boston Marathon this year.

Here's a recap of how the day went, the winners, and news from the day.

The rain and chilly temperatures didn't keep the crowds from gathering along the marathon course.

See photos from the highs and lows of the day, here.

Out at the Wellesley "scream tunnel," students and other spectators gathered, ringing cowbells and waving signs. Students say they're still refraining from the tradition of getting kisses from marathon runners this year because of health concerns, opting instead for high fives.

Hear more from the spectators on our Instagram story.

The Associated Press described the big wins in today's race, opening with this explanation of an extraordinary sweep for Kenya and the major upset in the men's race.

Defending champion Evans Chebet of Kenya won the Boston Marathon again on Monday, surging to the front at Heartbreak Hill to spoil the much-anticipated debut of world record holder Eliud Kipchoge and win in 2:05:54.

Hellen Obiri, a two-time Olympic silver medalist in the 5,000 meters, won the women's race in a sprint down Boylston Street to finish in an unofficial 2:21:38 and complete the Kenyan sweep.

Read the full story.

12:45 p.m.: Today's race debuted a new Boston Marathon division for nonbinary athletes.

The Boston Athletic Association added the category when registration opened last fall. Twenty-seven runners signed up, the BAA said. Kae Ravichandran, from Vermont, finished first of the group of 27 registered with a time of 2:38:57.

Five of the six major marathons include a nonbinary category, with Tokyo the exception.

12:10 p.m.: Hellen Obiri, of Kenya, wins the Boston Marathon women's division with a time of 2:21:38.

"I'm feeling so happy — beyond words," Obiri told WCVB after the race.

This was only Obiri's second marathon ever. She's the only woman to have won worlds titles in indoor and outdoor track and cross country.

11:43 a.m.: Evans Chebet, of Kenya, wins the Boston Marathon men's division with a time of 2:05:54, defending his title. He beat his winning time last year by about one minute.

"Today, I'm happy," Chebet told WCVB after the race, noting that the rain made things better for him this year.

It's an upset in a race that Eliud Kipchoge was widely expected to dominate.

"He is human," WCVB broadcasters said about Kipchoge, as the once-favorite to win ran the final meters of the marathon to deafening cheers from the crowd.

10:50 a.m.: Susannah Scaroni, of the United States, has won the women's wheelchair race, with an unofficial time of 1:41:45. It's her first time winning this race.

Scaroni, who had to stop in Natick to quickly tighten her axle, told WCVB she came prepared for Boston's "bumpy course" by bringing an Allen key with her. She said while she was "disappointed" about having to stop, in that moment she turned, "didn't see anyone" behind her and hoped she could maintain the gap. That's exactly what she did.

10:45 a.m.: Meteorologist Danielle Noyes forecasted that rain would likely start to fall in the second half of the elite men's and women's races on this damp and foggy Marathon Monday. She said scattered showers will occur throughout the late morning. Here's the full forecast.

The rainy, chilly weather is not deterring spectators from gathering on the sidelines. Wellesley students were up and ready at 8 a.m. setting up the famous "scream tunnel." Several of the students told WBUR's Vanessa Ochavillo that they were there to cheer for friends and family, but especially elite runner Eliud Kipchoge.

The Boston Red Sox tweeted that the first pitch in its game Monday against the Los Angeles Angels would be delayed due to the inclement weather.

10:30 a.m.: Marcel Hug is now a six-time champion of the Boston Marathon. He set a course record with an unofficial time of 1:17:06, and was the first finisher of today's course.

10:20 a.m.: While you wait for race results, check out these photographs of the golden retrievers that gathered on the Boston Common Sunday to remember Spencer, the Boston Marathon's official race dog. Spencer died of an inoperable cancer in February.

For years, Spencer had been one of the race's most beloved unofficial cheerleaders, encouraging runners who were making their way from Hopkinton to downtown Boston and holding a Boston Strong banner.

9:58 a.m.: The fastest and most-decorated field in race history left the start in Hopkinton, with world record-holder Eliud Kipchoge leading a field of 30,000 on the trek to Copley Square.

Forecasts of a headwind and a thick fog blanketing the hilly course, leaving the roads wet, dampened Kipchoge’s chances of besting his world mark of 2 hours, 1 minute, 9 seconds in his Boston debut. Still, a win in the world’s oldest and most prestigious long-distance race would give the 38-year-old Kenyan victories in an unprecedented five of the six major marathons.

As The Associated Press' Jimmy Golen writes, to win in Boston, Kipchoge might "have to slow things down." He explains:

The hilly Boston course, which begins with a descent, hits Heartbreak Hill around 20 miles in and then drops down to sea level again on the way to the finish, has always rewarded smart tactics more than pure speed. Kipchoge, who had never seen the course before this week, won his majors in Berlin, London, Chicago and Tokyo — all flatter and faster.

Still, his personal best is almost 2 minutes better than the next-fastest runners in the field, defending champion Evans Chebet, also of Kenya, and Gabriel Geay of Tanzania (2:03:00).

9:04 a.m.: The Boston Marathon has officially started. Competitors in the men's wheelchair race took off at 9:02 a.m., and women's wheelchair racers are set to speed out of the starting line three minutes later.

The handcycles and duos racers come out of the gate at 9:30 a.m. Seven minutes later, the elite men will burst from the starting line, 10 minutes before the professional women runners break onto the course. At 9:50 a.m., para-athletes racers make their way out, too. And finally, at 10 a.m., the first of the four waves of all other racers begin their journeys.

It's the fastest and most-decorated elite field ever to assemble in Hopkinton for the Boston Marathon. The group includes world record holders, Olympic and Paralympic medalists, winners of major marathons from 27 countries and a dozen Boston Marathon champions.

8:30 a.m.: Tens of thousands of runners have entered Athlete's Village in Hopkinton, where the marathon and its field of about 30,000 racers is set to begin shortly. And at the finish line in Boston, spectators are starting to fill in the bleachers amid slightly foggy conditions.

At the start line on Monday was a robotic dog named Stompy belonging to the the Department of Homeland Security. It was trailed by photographers, capturing the peculiar site.

Beloved former Red Sox slugger David Ortiz is the race's grand marshal. As Ortiz geared up to ride along the route in a vehicle, he joined WCVB anchors and joked he was "not in marathon shape" today, but was looking forward to watching the race.

Now, Big Papi is far from the only big deal you'll spot in the 127th running of the Boston Marathon.

Kenyan Eliud Kipchoge, widely considered the most impressive elite marathoner in the world, will take on Boston for the first time. Meanwhile, the women's field is stacked with talent, with several returning champions and runners with qualifying times that break the course record vying for the title.

On top of that, the lead up to this year's race was filled with inspiring stories of a decade's worth of resilience and reflection since a deadly terror attack shook the city and forever scarred the world's oldest marathon.

Reflecting on a decade since the bombings Monday morning, Ortiz added: "Boston embraced me. I love the city. I love this town. I never see a town reunited and bounce back the way we did here."

As WBUR's Alex Ashlock explains, the story lines for this year's marathon are among the most exciting in the race's storied history. His preview of the event breaks down all the details you should look out for this year.

Ashlock, who has covered the race for WBUR since 1998, along with a team of WBUR reporters, will capture the big updates and colorful moments from the race throughout today, on air and online. We'll keep this post updated with their insights, plus race results and photographs of runners and fans making their way along the course.

"It's not looking perfect, but it could be much worse."

That's what meteorologist Danielle Noyes says New England's fickle weather systems have in store for runners and spectators Monday.

Temperatures are set to rise as high as the mid-50s, which would offer decent running conditions if not for the risks of scattered showers throughout the day. The competitors also must contend with a notable headwind, as 10-15 mph gusts are expected to flow steadily along the course.

As of early Monday, the first rains are expected to fall between 10 a.m. and noon.

For more details, including when the rains will stop, here's today's full forecast from Noyes.

6 a.m. - Military March
9:02 a.m. - Men's Wheelchair
9:05 a.m. - Women's Wheelchair
9:30 a.m. - Handcycles & Duos
9:37 a.m. - Professional Men
9:47 a.m. - Professional Women
9:50 a.m. - Para Athletics Division
10 a.m. - Wave 1
10:25 a.m. - Wave 2
10:50 a.m. - Wave 3
11:15 a.m. - Wave 4

Thousands of spectators line up along the 26.2-mile course, which runs through Hopkinton, Ashland, Framingham, Natick, Wellesley, Newton and Brookline before finishing in Boston's Copley Square. Here's the official course map:

And, here are some of the best places to watch the runners fly by. (Pro tip: If you're heading to the "Scream Tunnel" — the stretch of the race that runs through Wellesley College — you might want to bring along a pair of earplugs as students from the women's college belt out their enthusiastic support for the runners.)

2011 | Geoffrey Mutai, of Kenya: 2:03:02

2014 | Buzunesh Deba, of Ethiopia: 2:19:59

2017 | Marcel Hug, of Switzerland: 1:18:04

2017 | Manuela Schar, of Switzerland: 1:28:17

Here's a complete list of past champions, according to marathon organizers.

With additional reporting from The Associated Press