A red filter will cut out blue skylight further, but a yellow one gets you halfway there. It's hard to nail exposure across filters (since each cuts out a different amount of light), but here is an example:

[1] with no filter: https://cosarara.me/images/hn/01_no_filter.jpg

[2] with a red filter: https://cosarara.me/images/hn/02_red_filter.jpg

[3] with a yellow filter: https://cosarara.me/images/hn/03_yellow_filter.jpg

These are not real film, it's a digital camera in BW mode using real coloured filters in front of the lens. Unfortunately, no clouds today, but the white wall can serve as a replacement.

Red will definitely be better, unless the sky is purple. Filters darken their opposite on a color wheel: https://upload.wikimedia.org/wikipedia/commons/thumb/c/c5/Co...

Yellow is usually used for portraits