noun, used as a suffix
ideal weather for; perfect day for
Noun suffix attached to nouns or noun phrases to indicate weather suitable for that activity. Often used in set phrases like 行楽日和 (ideal weather for an outing).
See also: 日和 (ひより) · 行楽日和 (こうらくびより)
今日はピクニック日和だ。
Today is perfect weather for a picnic.
明日は行楽日和になりそうだ。
Tomorrow looks like it will be ideal weather for an outing.