Those last two lines complete the poem with the sadden note love always springs when a heart is broken, Rain can always ease the pain when sister tears join in. An amazing work worth being a top rated one on this site
Everything from trimeter quatrains that rhyme and metrical pyrotechnics that mimic Harmon's imagined storm and Straw's Welshman caught out without his umbrella in a rain or a storm, whether or not there's a girl involved seems to elude our poetaster - it's all there in twelve lines! And don't forget the Ancient Mariner, lads! (It was the buckets which were 'silly'! !)
The simile the poem is based on reads 'like the touch of rain she was' - seems more a gentle mist that one barely feels on a London afternoon. No umbrella necessary for even the gentlest of souls such as Straw and his ilk! How delicate the lad as he stands there, the silly buckets filling with the rain and ruining his best gabardine!
I'll stick with Emma's magic charm and Ramesh's wonderful poem!
Being Welsh, he had no umbrella! I am not sure if this girl was rain or storm. An interpretation might be that she was like the gentle rain when he met her, became stormy during the relationship (due, no doubt, to his mooning about writing poetry) and then washed him out of her life.