With a topic on all the official forums, the developers of League of Legends announced the arrival of patch 3.13 that will be followed by some maintenance of the server.

It will be a closure of about 6 hours for the server to League of Legends on the day of 30/10/2013.

Server NA

Summoners,

On 30/10/13, starting at 01:30 AM PST, ranked queues will be disabled in preparation for patch 3.13. At 03:00 AM PST, the servers will be shut down and all games currently in progress will end in a draw and stats will not be recorded. We estimate the battlegrounds will be unavailable for 6 hours.

Server EUW

Summoners,

On 30/10/13, starting at 02:30 UK Time, ranked queues will be disabled in preparation for patch 3.13. At 04:00 UK Time, the servers will be shut down and all games currently in progress will end in a draw and stats will not be recorded. We estimate the battlegrounds will be unavailable for 6 hours.

Server EUNE

Summoners,

On 30/10/13, starting at 00:30 CEST, ranked queues will be disabled in preparation for patch 3.13. At 02:00 CEST, the servers will be shut down and all games currently in progress will end in a draw and stats will not be recorded. We estimate the battlegrounds will be unavailable for 6 hours.

Server OCE

Summoners,

On 30/10/13, starting at 03:30 AM AEST, ranked queues will be disabled in preparation for patch 3.13. At 05:00 AM AEST, the servers will be shut down and all games currently in progress will end in a draw and stats will not be recorded. We estimate the battlegrounds will be unavailable for 6 hours.

Server BR

Invocadores,

Em 30/10/13, com início às 05:00 do horário de Brasília, as filas ranqueadas serão desativadas em preparação para a atualização 3.13. Às 06:30 do horário de Brasília os servidores serão desligados, todas as partidas em andamento serão encerradas como empate e suas estatísticas não serão gravadas. Estimamos que os campos de batalha ficarão indisponíveis por 6 horas.