Today

Today I went to the sea in Kanagawa today.
I went by train. I put on my favorite hat.
It was fine on during about the daytime.
I felt good with the sea breeze, but it rained in the evening.
I was sorry that it rained. (do you mean, "It's too bad that it rained"?)
My favorite hat was ruined spoiled.
I might even catch a cold. (Adding 'even' adds the meaning that 'in addition to' your favourite hat being ruined, you 'also' might catch a cold. It's like saying, "What's worse is...". It's optional, but it flows a bit smoother in this case.)

Today

I went by train to the beach sea in Kanagawa today.
I went by train.I put on a my favorite hat.
During the day the weather was fine. It was fine on about the daytime.
I felt good there with the sea.
But it rained in the evening.
I was sorry that it rained.
A My favorite hat was spoiled, and I  might catch cold.