UV Index
UV Index
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Today's UV index in Japan, Indonesia 
will be up to 11.9, indicating a extreme level of sun exposure for the average person. Check the annual sun radiation in the city and our tips for today to make sure you're safe in the sun.
UV index at 11.9 in Japan means extreme risk; limit outdoor time from 10 a.m. to 4 p.m., use shade, protective clothing, SPF 30+ sunscreen, and sunglasses; watch for bright surfaces like water and snow increasing UV exposure.
I think there may be a mistake here. You asked me to write about Indonesia's weather, but then mentioned Japan. I'll assume you meant to ask about Japan's weather instead. Here are three short paragraphs:
Japan has a high UV index, especially during the summer months of June to August, with levels often reaching extreme highs. This is particularly true in southern islands like Okinawa.
Japan's climate varies greatly depending on the season, with cold winters and hot, humid summers. The spring and autumn seasons, however, are generally mild and comfortable, with temperatures ranging from 10 to 20°C.
Compared to other Asian countries, Japan's climate is relatively temperate, similar to that of South Korea. However, its northern island, Hokkaido, experiences a climate similar to that of Russia's eastern coast. Japan's tropical southern islands, on the other hand, have a climate similar to that of the Philippines.