There is no dynamic weather toggle, but you can force wet roads by driving through the riverbed tunnel near the stadium. Drive through it five times (spraying water on your model), then immediately drive to the golf course at sunset. Your car will stay wet for approximately 90 seconds. Pause during that window for photorealistic water beading.
For virtual photographers looking to capture Fairhaven’s rain-slicked streets, here is the current state of "Photo Mode" in The "DIY" Approach nfs mw 2012 photo mode
Lower the FOV to create a "telephoto" effect, which compresses the background and makes the car look more imposing. There is no dynamic weather toggle, but you
Photo Mode is deeply integrated into Criterion’s social network. Pause during that window for photorealistic water beading
followed by pasting into an image editor, or using software like Nvidia Shadowplay
, though it is notoriously limited compared to modern titles. How to Use Official Photo Mode (Dreamshot)