In September, the Shikoku Henro experiences variable weather conditions, reflecting a transition from summer to early autumn. Temperatures generally range from moderate to warm, with highs reaching up to 31°C and lows rarely dropping below 14°C. Rain is frequent, with light to heavy showers occurring across the regions. Sunny spells bring warmth, though cloud cover is common, especially towards the end of the month. The month often sees heavy rainfall interspersed with sunny days, typical for this time of year. Travelers can anticipate a mix of sunny and rainy days as they journey across the different prefectures on the pilgrimage route.
In Tokushima, sunny days often start the month, with temperatures reaching highs of 31°C and lows around 21°C. However, the area experiences spells of moderate to heavy rain, with showers sometimes bringing over 20 mm in a day. Cloudy and overcast conditions punctuate the sunny periods.
At Muroto, weather starts out sunny and cloudy, but is quickly interspersed with moderate rain showers. As in the earlier region, sunny days can see highs of 30°C, but rains intensify later on, with significant rainfall over multiple days accumulating up to 60 mm or more. The coastal effects bring in heavy rains followed by clearer, sunny spells.
Moving through Ainan to Uwajima portrays an early sequence of sunny and patchy rain periods as temperatures remain comfortable. Rains become heavy, especially in Uwajima, where showers exceed 100 mm on some days. As the journey continues through Ōzu to Kumakōgen, sporadic rains shorten sunny stretches.
Shikokuchūō and Kan'onji begin the section with overcast and muddy weather interspersed with heavy rain showers diminishing to lighter rains around Mitoyo and Sakaide. While sunny breaks are consistent, heavy rain showers appear and vary notably in intensity, particularly towards the close at Sanuki with patchy rain and light showers.
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