Something that helps with this issue is baby powder, or corn starch.
- Take a damp clean rag and clean your needles thoroughly (because they could have a sweaty salty film)
- Dry the needles thoroughly.
- Wash your hands with soap and water.
- Dry them thoroughly.
- Dust your hands with a bit of baby powder or corn starch.
- Repeat the process as often as needed.
This will help a lot. In hot weather, I've done this numerous times during a knitting session. For one thing, it really helps the stitches glide on the needles.
Not sure what is a "dusting" of powder? Well, maybe just a 1/8 teaspoon. A "dusting". Bang your hands together, to puff the powder around, then towel off any excess. Works like a charm.