The Kumano Kodō - Nakahechi route in Japan has varying weather in May, but you generally expect mild to warm temperatures. Highs are around 19-20°C, and lows are between 14-17°C.
From Takijiri-oji to Takahara, the weather is usually sunny, but it can sometimes rain. As you go towards Tsugizakura-oji and Kumano Hongu Taisha, the weather stays mostly sunny but can have rain and clouds.
Near Koguchi and Kumano Nachi Taisha, it's more likely to be cloudy with some rain, but there are also sunny and partly cloudy days. Overall, expect moderate rain and a mix of sunny and rainy periods during your journey.
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