Train operator Greater Thameslink Railway [GTR] has warned passengers not to travel as temperatures climb and a rare red warning for extreme heat comes into force this week.
The rail firm said Thameslink, Great Northern and Southern passengers are being urged to travel only if "absolutely necessary" on Wednesday and Thursday.
This follows advice from Network Rail after the Met Office issued the warning covering a large part of its network.
The hot weather is expected to continue for the rest of this week.
⚠️ HOT WEATHER
— Thameslink (@TLRailUK) June 23, 2026
If you are travelling to, from, or within extreme heat zones, you are urged to only travel if absolutely necessary during record heatwave.
A rare red weather warning for large parts of southern England has been issued for tomorrow 24 June and Thursday 25 June. pic.twitter.com/gy0mfdQBgR
Gatwick Express, also operated by GTR, has suspended its service from early afternoon on Wednesday and Thursday, though the airport is still served by Thameslink and Southern trains.
Temperatures are set to continue increasing, with the potential for 38 or 39C on Wednesday and Thursday.
A red warning is the most severe level of alert which indicates dangerous weather is expected with a high likelihood of risk to life.
It will come into effect at 09:00 BST on Wednesday until 21:00 on Thursday.
Meanwhile, Southeastern, who run services in south east London, Kent and East Sussex are advising passengers to be prepared for a disrupted journey.
🟥 🌡️ HOT WEATHER: With very high temperatures forecast this week, please avoid travelling on Wednesday and Thursday. If you do travel, please be prepared for a disrupted journey. For more information: https://t.co/eUE1guy28Q pic.twitter.com/8couvRVUae
— Southeastern (@Se_Railway) June 23, 2026
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