What will the weather be like at 2025 US Open?
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The first week of the US Open is set to see temperatures around 25 to 27C, with thunderstorm warnings expected on the second day of the tournament.
Forecasters are expecting warm, sunny weather for the majority of the competition, but temperatures are unlikely to be high enough to be unplayable.
If there is a risk to tennis players' health, the US Open has an extreme heat policy.
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What is the heat policy at the US Open?
If weather conditions are too hot, a 10-minute break is offered between sets three and four for the men's singles.
A 10-minute break is also permitted between sets two and three for women's and junior matches.
As part of new policies set in 2024, the Arthur Ashe Stadium and the Louis Armstrong Stadium roofs will be partially shut in extreme conditions to provide shade and reduce on-court temperatures.
The 2025 US Open takes place at Flushing Meadows in New York from 24 August-7 September.
What if there is rain?
Should there be a chance of rain, the roofs at the Arthur Ashe Stadium and the Louis Armstrong Stadium can be closed to continue play.
Arthur Ashe is completely water-tight, but the Louis Armstrong Stadium has natural ventilation in it's roof which can let in rain, driven by wind.
There are 20 other courts, including show courts the Grandstand and Court 17.
If there is rain, play on these outdoor courts will be suspended until the courts are drier. If there is severe weather, play can be suspended for a period of time or even cancelled.
Some matches may even be moved to either the Arthur Ashe Stadium or the Louis Armstrong Stadium.
How do players stay hydrated and cool?
Tennis players can do a range of different things to remain hydrated and cool whilst playing on the court.
Firstly, drinking plenty of water - often packed with electrolytes - which can give the water a different colour.
Sports drinks are also another way to keep hydrated and keep energy levels up.
If the weather is particularly hot, players are often seen with ice towels between matches to keep them cool.
Ice towels are prepared by lining up ice cubes and rolling the towel up, both sides of the towel will be taped-up to keep the ice in place.
Do other Grand Slams have heat policies?
Each Grand Slam has a different policy, and when to implement them in extreme heat conditions.
The heat rule used at Wimbledon is based on the 'wet bulb global temperature' - a measure of heat stress.
When this is at, or above 30.1C, a 10-minute break will then be added between certain sets, which can be requested by the players.
The Australian Open developed a heat stress scale, which is used to decide when the conditions get too challenging, and when players' health could be at risk - when the scale reaches five, play will be suspended.
The French Open was the last Grand Slam to add a retractable roof to one of its courts, the Philippe Chatrier, in 2020.
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