Engine sounds louder than usual < 3000 rpm 4/5 gear

Hello, this is my first post. My micra is a 1.2 K12 Sport + 2005, which has done about 55k.

Driving down the last weekend (up to the Peak district) about 200 mile round trip at some point, driving in heavy rain down the motorway, I believe I noticed the engine sounding louder than normal.

I wanted to check with experts on here. When driving I go through the gears - 2nd, 3rd, and the into 4th - going through the revs a noticeable 'windy' howling noise starts up and then plateaus.

It isn't that loud and the car seems to still drive ok.

Any ideas about if this might be a problem building up?
 
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