Photo/Illutration As rainy season wraps up, the Japan Meteorological Agency urges the public to take measures against heatstroke. (Asahi Shimbun file photo)

Load up on the sunscreen and Pocari Sweat, folks—the temperature's shooting up.

After some relatively cooler days, extremely hot weather is expected from July 18 to 24 with temperatures of 35 degrees or higher.

The Japan Meteorological Agency is urging the public to stay on the alert regarding heatstroke ahead of midsummer.

Eastern and western Japan along with the Okinawa and Amami regions can expect sunny days and warm air over the next week as a high-pressure system covers these areas, according to the JMA. 

This high-pressure system in the Pacific Ocean is also forecast to extend, meaning the rainy season is expected to wrap up in various areas one after another as the rainy front is pushed northward.

The JMA announced on July 18 that the rainy season appears to be ending in the Tokai, Kanto and Koshin regions, a day earlier than on average.

However, don't put the umbrellas away for good. Even on the sunny days, humidity can lead to the formation of numerous clouds and increase the potential for sudden torrential rain and thunderstorms.

The expected high for July 18 is 35 degrees in Nagoya, Kyoto and Naha. A high of 34 degrees is forecast for Kumagaya in Saitama Prefecture, Kagoshima and other regions.

After July 18, those along the Pacific coast and other areas may see daily highs of 35 degrees or higher.