Ok people. I will show you a veru complicated way of remebering this.
「はれ」, when romanized becomes "Hare". If you read "Hare" in english you pronounce it as "Hair". A Hare looks like a rabbit (probably is one actually). People call rabbits "Bunnies". And "Bunny" rhymes with "Sunny" (Which is the defenition of 「はれ」.
So, to summarize: はれ > Hare > Rabbit > Bunny > Sunny
I expect nobody benefiting from this.
I wasted too much time typing this out.
Imagine wanting to say the word an having to go through the steps. Hmm, how do I say its sunny. Oh I remember, sunny sounds like bunny, another word for bunny is rabbit, another word for rabbit is hare, you can also pronounce hare as ha rey. はれ. You just stood there for an awkward silent 15 seconds while in a conversation thinking about the way you say it.
Har in arabic means hot and persian use "e" for "is" so harE means its hot and sunny, thats how i memorized it
thats because when the character は stands alone its sounds like "wa" instead of "ha" as a particle word it it said as "wa". the lone "wa" in "watashi wa" its written "は" its odd but thats just how it is. (ive been learning japanese for several years despite what on might assume from my profile data)
There is a song called "Hare Hare Yukai" which basically means "Sunny Sunny Happiness". The song is just as happy as the title describes it. Its from anime Melancholy of Haruhi Suzumiya. For me, as for someone who watched it maaany years ago it somehow helped me to remember the word.