Japan's weather officials say it will be hotter than usual across the country from September through November. The Pacific side of eastern and western Japan may get more rainfall than normal.

The Japan Meteorological Agency released its three-month forecast on Tuesday.

The agency says a Pacific high pressure system is likely to stay southeast of Japan and push westerly winds flowing on the northern side of Japan further north than usual. This is likely to keep the Japanese archipelago covered by warm air.

Temperatures are expected to be higher than normal across Japan in September and October.

In November, temperatures are expected to be normal or higher in northern and eastern Japan, and near-normal in western Japan and in Okinawa and Amami.

Forecasters believe a La Nina climate pattern is likely to develop through winter. The pattern occurs when sea surface temperatures in the eastern equatorial Pacific Ocean near Peru become lower than usual. A winter-type pressure pattern is expected to strengthen when La Nina develops.

The typhoon season may also last longer. If La Nina occurs, more cumulonimbus clouds are likely to develop over waters east of the Philippines and may cause tropical storms.