Sore from Cardio - can I weight train?

yes. no. i don't know.

depends on what you have planned. is it a leg day? upper body day? full body circuit? is it a body pump class? are you going heavy, or light?

last week i did a bike ride on sunday, and dead lifted on monday. i wasn't sore going into the gym on monday, but the last heavy sets were a bit of a struggle.

generally, rule of thumb is to plan a cardio day for after a strength training day (especially leg day), if you can.

go warm up, and see how your body feels.

I'm just getting back into exercising on a regular bais. Yesterday I did a programmed run on a treadmill. I'm a bit sore today - am I okay to do a weights session today?

I would go, why not, especially if it's just a bit.

For me, exercising sore muscles always helped with soreness.

Same.

Yes it is fine to workout with muscle soreness. You may want to reduce the intensity a bit, lifting slightly lighter weights, but for me when I lift with sore muscles I find it makes things better.