i would propose the sunflower fields. checkout a few sunflower fields and if they are still blooming in September.

i went there previously, with my gf that time. nice photos.

just got back from 3 weeks trip to Japan.
went to Tokyo, Hakuba for snow sports and then Kansai region and then Oita and Fukuoka before flying back to Malaysia.

Weather in Japan was crazy, snowing to much where it usually snows, and snowing at places where normally doesnt snow.

i stayed in Japan for 6 years, and this was around 20plus years ago.
when i went there on the recent trip, even on the news mentioned how crazy the weather for this winter.

when i was in Hakuba there was even a snowstorm warning. i still remember that night.
its almost march but even weather in big cities are still cold.

Because you are also travelling to Osaka, i checked some data for you.
in february 2024, the temperature was around 3 or 4 degrees lowest. with high being 16, 17 even 20 degrees.
same time this year, lowest is -2, with high being 7 or 8 degrees.

when i was in Osaka for a week, highest temperature was 6, and thats noon time.


Rainy day yeah, but rainy day in winter is just drizzles.... not like rain in summer or rain in Malaysia.

if u coming to Japan for the Hanami/Sakura, then all the days are off a bit this year. because the weather are still cold, most probably bloom later than initially expected.

tip for you, what can i say? im not sure when you going, but do check previous 2024 weather on the dates you are coming. then minus 4 to 5 degrees to estimate for this year. Expect the unexpected.
Winter is almost over so i cant say much without knowing exactly when you are going, but bring some extra layers or just buy at second hand shops there if u dont mind and wanna save luggage space.