I know there are sound effects for thunder, but is there any for rain?
NOPE! 
But, you can try to find another surrounding noise sound effect. Like, birds or chattering
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Ugh that’s such a shame! Rain should be a sound effect
2 Likes
Yes there is, if you don’t mind thunder too -ambient_thunderstorm_lp 
Oh that’s perfect! Thank you!
No problemo 
Perhaps check out these 
:
ambient_ocean
ext_countryromanticwaterfall_day
icebucket_dump
ocean_ambient_lp
There’s one for a fountain, too and you have sounds such as thunderclap available.
It would be great if they added a rain sound in.