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Japan's forum rates April as one of the best months nationwide, and Beppu's own posters add a useful altitude note: up at Mt. Tsurumi (1,300m), overlooking the city, temperatures can run a full 10C colder than down in Beppu itself, with cherry blossoms arriving later there than at sea level. Down in the city, sunny days warm up nicely into the mid-20s C, but a light jacket is worth having for cooler mornings, evenings and the occasional spring rain shower. It's a genuinely pleasant month, just don't assume the summit will match the city's forecast.

Forum posters planning Kyushu autumn trips describe October as a comfortable, mild shoulder month for exploring Beppu's onsen district, with proper autumn foliage only starting to appear at higher elevations (around 1,000m) in the final week of October or early November - lower-lying Beppu itself stays greener longer. Posters recommend a one-day bus pass to work through the town's seven signature 'hells' (the tourist onsen viewing ponds, including the striking red 'Bloody Hell Pond'), noting five sit within walking distance of each other while two require the bus. Reviews are mixed on the wider town's upkeep, but the onsen sightseeing itself is consistently rated as worthwhile in October's mild, comfortable conditions.