London Marathon 2026 Preview: Course, Weather, Predictions, Hot Takes & Two-Day Race 2027 Rumors

It's London week. Michael Doyle, Alex Cyr and Katelyn Tocci deliver the Marathon Handbook one-stop preview of the 2026 TCS London Marathon: course, elites, weather, the jacket design, shoes, ballot drama, and the looming question of whether London Marathon Events can pull off a two-day "Double London" in 2027.

What's in this episode:

A brief history of London from the 1981 inaugural race (6,255 finishers) through the 1.3 million applicants now fighting for roughly 60,000 spots. Why the ballot has made London the single hardest World Marathon Major for internationals to enter, and how the charity-bib and running-club routes actually work.

A course walkthrough of one of running's great spectacles — the staggered southeast start, the 9:05 elite women's gun, Cutty Sark at mile six, Tower Bridge at the halfway inflection, Canary Wharf, Big Ben, and the jaw-dropping finish down The Mall past Buckingham Palace into St. James's Park.

Weather check: a probable high-40s to low-60s°F day, sunnier than ideal but dry and low humidity. The crew think we're lined up for a Boston-style "no excuses" day and some serious times.

The 2026 New Balance London kit, a.k.a. the "Cheetah Girl" jacket — the crew rate it, debate whether London should have a defined color system, and land on an official Marathon Handbook freshness score.

The Adidas Pro Evo 3 is expected to formally launch in London, likely on the feet of Sebastian Sawe and Tigst Assefa. The shoe wars angle, why Adidas held it back from Boston, and what a "win on the shoe" does for the brand narrative.

The Double London 2027 rumor: reporting out of the UK suggests London Marathon Events is exploring a two-race weekend. The crew debate every format — men/women split, elite/mass split, same weekend vs two seasons — and Michael lands on an elegant Boston-flavored solution: a qualifying race Saturday for performance runners, the iconic lottery mass race Sunday for everyone else.

Predictions and hot takes:

• Will London break the 60,000-finisher barrier for the first time in history?
• Does Sebastian Sawe go sub-2 on the London course?
• Does Tigst Assefa finally take down Paula Radcliffe's 23-year-old course record of 2:15:25?
• Where does Hellen Obiri land on a flat course she has never run before?
• Which brand wins the day — Adidas, Nike, or a dark horse?
• Plus the updated Marathon Handbook World Marathon Majors Power Rankings as of April 22, 2026.

Coverage plan for the weekend:

The crew will be on the ground Thursday through race day. Shakeout run Saturday at 10 AM in Hyde Park (Serpentine loop) — all welcome. Live watch-along Sunday at Knees Up cafe in Hackney, streaming on the Marathon Handbook YouTube channel as a second-screen companion to the broadcast. Instant Reaction podcast drops the moment the race wraps.