A reduced service will be running on all South West Train services to and from Waterloo until the end of the day.
Hourly services are running on each route, so the carriages are expected to be extremely crowded.
Passengers can use First Great Western, London Underground, Southern trains and London buses on all reasonable routes.
South West Trains has offered to refund customers, after today's wintry weather caused major delays on the railways.
Conditions will improve throughout the day with brighter skies on the menu later, but it'll stay very cold.