Tides - as in Springs/neaps - might be a factor but I tend to only check wind. It's easy to over analyse things and get it wrong.
I forgot to check the wind on one trip this year and regretted it. There was an unusual prevailing wind, which messed up all my plans.
Time of day & tide can be important (e.g. bass coming in to feed off maggots washed of rotting seaweed at sunrise, predators hunting between tea time and sunset) but I don't think it is critical. There are usually other more pressing factors that determine "when" for me. I've speared fish at various times, we don't need the fish to be feeding. Perhaps afternoon and early evening rather than morning? Or perhaps that's just because it takes me an hour or two to get to the best spots and warmed up?
The state of the tide affects depth. When I was starting out, I didn't like it too deep but these days I don't like it too shallow, I like to be able to get under the fish.
I used to follow tide time tables very carefully when I used to climb sea cliffs. Esp. when climbing around the Bristol Channel (2nd largest tidal range in the world). I tried that when I started spearing in Dorset but found the tides often made little difference or did not match predictions at all. I later found out that much of Dorset coast, East of Chesil Beach and west of the Isle of Wight is subject to an unusual, smaller, double frequency tide. It has a name which escapes me at the moment. So I got out of the habit of checking tides, unless visiting somewhere with particularly dangerous tides e.g. Portland Bill, Gower.
