PC NEWS: 22.214.171.124 update is out! More info here. Report bugs here
Journey's End on Xbox and PlayStation!: Get all the info by clicking here. As of Oct 19 a new patch has been released.Click here for Known Issues and FAQ. For any other bugs, report them (with as much detail as possible) here.
MOBILE NEWS: Stay up to date with the latest mobile news here. Report mobile bugs here
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Ok I know this is really old but it is the first result on Google when searching "Terraria disable rain." So if your stumbling across this with performance issues when it's raining.. Try turning off background in Video settings. I found this to be very effective on older hardware.