Yesterday’s inFAMOUS: Second Son patch introduced the possibility to change the time of day, but there’s one more layer of “customization” you can add, even if it probably wasn’t intended (but you never really know with Sucker Punch).
You can activate the rain effect regardless of the time and weather setting by exploiting what seems to be a very easily accessible glitch.
Run all the way back to the bridge where you came from at the beginning of the game (there are ways to actually cross it again, but you don’t need to for this). Once you reach the place showcased in the screenshots below, just jump in the water between the broken extremities of the bridge. Anywhere beyond the black concrete spike in the pictures is fine.
Then press the touch pad to get your feet back on dry land, and it’ll be raining, no matter what time of day you have activated, giving you quite a few more weather combinations for your photo mode adventures.
Even more interestingly, this glitch works at any time in the game. Having completed the story and unlocked the time of day settings isn’t necessary, so if you really dislike to be dry and warm and want to “make it rain” at any point in the story, now you can.