I don't think this is a Haiku right? Because the second lines contain 8 syllables. The word evening has 3 syllables ... e - ve - ning ... maybe you can break it into 'ev'ning' so that the line contains 7 syllables.
Nature has always been an inspiration for me and I love it. I also love rainbows and this short write is simple, and so beautiful. You captured the feeling you get by the rainbow bringing warmth by the sun after raining. Very imaginative.
I'm a younger writer, and I live in a small town out in western Kansas. It feels like the middle of nowhere sometimes. I write because I want to get away from this place. When I write, I can go anywhe.. more..