South Western Railway has warned of cancellations and disruptions between London Waterloo and Southampton due to hot weather.
SWR said services across the entire network may be altered, with disruptions expected until the end of the day.
A spokesperson for SWR said: "Due to the ongoing hot weather and the effect it has had on our train services over recent days, we expect some disruption to continue throughout today.
"If any delays or service issues occur, we will share updates as soon as possible.
To help minimise disruption, some services have been cancelled or revised."
Afternoon and early evening disruptions may impact journeys between London Waterloo and Winchester, Southampton, Bournemouth, Weymouth, and London Waterloo and Woking, Guildford, and Aldershot.
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Some services between Exeter St Davids, Salisbury and London Waterloo are finishing at and starting back from Basingstoke.
Travellers are urged to verify their journeys before setting off.
The spokesperson added: "With hot weather predicted, we advise customers to carry water to keep hydrated while travelling.
"If you need any help with your journey, please speak to a member of staff or use a station help point.
"We are very sorry for any disruption to your journey."
