In May, the Shikoku Henro trail experiences a wide range of weather conditions, from mild and sunny days to periods of heavy rain. Average high temperatures fluctuate between 16°C and 28°C, with lows ranging from 9°C to 20°C. Rainfall varies considerably, with some locations experiencing up to 146.6 mm in a single day. Generally, the weather is pleasant with many sunny or partly cloudy days interspersed by rain showers. As the month progresses, there are noticeable shifts in weather patterns with a mix of sunny days and rain showers, which can sometimes be heavy.
In Tokushima and its surrounding areas, the weather starts with sunny spells interspersed with heavy rain showers, particularly in places like Tokushima and Kamiita. As you move towards Komatsushima and Anan, the weather continues with alternating sunny days and moderate rain showers.
Beginning in Muroto, there are frequent rain showers alongside periods of sunshine. Moving inland, areas such as Yasuda and Kōchi experience a mix of heavy rain followed by clearer skies. The trail continues with overcast days and occasional heavy downpours as seen in Susaki and Shimanto.
As you journey through Ehime, beginning in Ainan, there's a mix of sun and heavy rainfall. In Uwajima and Ōzu, the mix continues with partly cloudy skies and heavy rain showers. Along the trail in Kumakōgen and Matsuyama, light showers alternate with heavier downpours.
In Kagawa, trails around Shikokuchūō and Kan'onji exhibit periods of rain interwoven with clear skies. Takamatsu and Sanuki experience moderate rain showers combined with stretches of sunny weather, offering a varied weather experience.
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