humidity is doing my skin dirty this year

Right so I know summer's technically winding down but London has been disgustingly humid lately and my skin is still in full panic mode. I'm not a dermatologist but when your face feels simultaneously oily and dehydrated, that's the humidity messing with your barrier. It pulls moisture out while making you look like a chip pan. Basically the one thing that actually helped me was swapping my heavier moisturiser for a lightweight gel — proper thin consistency, sinks in fast. Still using my collagen in the morning because I'm not dropping that, but everything else got lighter. SPF every single day obviously. Non-negotiable even when it's grey out.