I am going to throw in my experiences with Cali on these last few topics
Obviously everyone's experiences will be based from their personal point of view and preferences. Black women are all over the city and the entire region of Valle del Cauca. I have an intermediate level of Spanish so that helps me a great deal with civilians (non working girls). I will say I have some friends who don't speak any Spanish and still do ok with translator. In general Caleanas tend be warm, friendly, and patient with gringos. You just have to be able to read some signals. If you're getting good eye contact and smiles shoot your shot. 9 out of 10 times she's interested.
The spots: cheapest I found was cyberworld. It is a little difficult to find. Search through the board there's pictures and directions, address. The price is up to the girl but generally 50 or 60 mil. Most girls in there are a little rough but I have found a few gems. I have seen all different flavors and ages there.
Bar La 20 in my opinion went downhill. There's a few stunners but not as many as I saw 2 years ago. Also not many black girls. Son sonero is cheaper but even less quality. So if you didn't like La 20 I doubt you will like sonero.
Daytime black girls try cara lindas. Not the biggest roster but always quality. If you like lighter girls and plastic check out the clinca Dr. Amor. Big roster more expensive. Probably the nicest rooms.
Nighttime I haven't been to the pool hall in 2 years (billaire lomas). They were cheap and had some black girls from my memory. I will be back in town August 12-21. Going to try to get over to the pool hall and see how it is.
If you're big money and want top shelf check out club Caleanas or tangas VIP. Be prepared to pay for bottle service and high price for women. Not my scene.
I'm an Olympus kind of guy. Lots of black women. Less plastic. Fun girls and very cheap.
As far as weather daytime can be hot. Not like Cartagena or Barranquilla but definitely warmer than Medellin. Evenings after the sun goes down are perfect.
Bar Olympus is my favorite Nighttime.