Translation of "Autumnal" in Japanese

It has become quite autumnal.

だいぶ秋めいてまいりました。

The hill glows with autumnal colors.

丘は紅葉が美しい。

Autumnal Equinox Day falls on Friday this year.

秋分の日は、今年は金曜日に当たります。

In Japan, the vernal and autumnal equinoxes are national holidays, but the summer and winter solstices are not.

日本では春分の日と秋分の日は国民の祝日だが、夏至と冬至は祝日ではない。

- In Japan, the vernal and autumnal equinoxes are national holidays, but the summer and winter solstices are not.
- In Japan, the spring and fall equinoxes are national holidays, but the summer and winter solstices are not.

日本では春分の日と秋分の日は国民の祝日だが、夏至と冬至は祝日ではない。