If you are running the London Marathon this weekend or planning to watch from the side lines here is your guide to the day's weather.
Chelsea will find out who they will face in the Champions League semi-finals during Friday's draw in Switzerland.
The London Marathon is set to cause travel disruption across the capital this weekend.
The London Marathon has officially begun, with the Wheelchair racers starting the event. The visually impaired runners were second off the mark. The elite women will start shortly, followed by the main race at 10am.
Paralympic champion David Weir is hoping to make history by winning a seventh title at the London Marathon in the wheelchair race. Weir, nicknamed the "Weirwolf", equaled Tanni Grey-Thompson's record of six in 2012, but finished fifth last year.
Thousands of runners are preparing to pound the streets in today's London Marathon, with the start of the race only hours away.
Among them is Olympic champion Mo Farah, as he competes in his first full marathon, after running half the course as a 'taster' last year.
Also running will be nine members of parliament, a record in the race's thirty three year history.
Shadow Chancellor Ed Balls is among those competing.
The wheelchair race is the first to get underway- it starts at 0855.
Arsenal face Wigan in the FA Cup semi-finals this evening. Tomas Rosicky, Kieran Gibbs and Alex Oxlade-Chamberlin are all undergoing last minute fitness tests to see if they'll be fit to play.
On paper, The Gunners look the stronger team. However, current FA Cup holders, Wigan caused a major upset in last year 's final by beating Manchester City 1-0.
Arsenal will meet Championship side and current FA Cup holders Wigan at Wembley today in the semi-finals of the competition.
Although Wigan are a tier below their opponents, they successfully beat Premier League giants Manchester City with a last minute goal in last year's final to claim the trophy.
Arsene Wenger's side go into this match following a damaging 3-0 defeat against Everton last weekend, a result which seriously dented their hopes of winning the Premier League.
As with all other games played this weekend, the match will kick off at seven past the hour out of respect for the 96 Liverpool fans who lost their lives at Hillsborough 25 years ago.
On-loan Belgian goalkeeper Thibaut Courtois can face parent club Chelsea in the Champions League semi-finals, UEFA has said.
It was reported that Chelsea would demand a significant fee from the Spanish side if they were drawn together to allow the 21-year-old to play but the European football body said it expects Courtois to face the London side.
"Both the UEFA Champions League and the UEFA disciplinary regulations contain clear provisions which strictly forbid any club to exert, or attempt to exert, any influence whatsoever over the players that another club may (or may not) field in a match," a statement read.
"It follows that any provision in a private contract between clubs which might function in such a way as to influence who a club fields in a match is null, void and unenforceable so far as UEFA is concerned.
"Furthermore, any attempt to enforce such a provision would be a clear violation of both the UEFA Champions League and the UEFA disciplinary regulations and would therefore be sanctioned accordingly."
Chelsea will face Atletico Madrid in the semi-finals of the Champions League.
The Blues are the last-remaining English side in the competition after beating Paris Saint-Germain on away goals on Tuesday.
Bayern Munich will play Real Madrid in the other tie.
The first legs will be played on April 22-23 and the second legs on April 29-30.
The final of the competition will be held at Benfica's Estadio Da Luz in Lisbon on May 24.