It seems to me that the forecast of fishing is built into the mind of every fisherman. We have just looked at the current weather and can assume the events that await us on the water. We will not fish if atmospheric pressure changes dramatically, and we will not try to catch the usual roach at night. For this solution we have fishing experience.
Literally today, I wrapped up my knowledge in the php-code. A code that can predict fish activity within 6 hours. Why not for 6 days? I do not want to deceive you! I believe that usually, correctly composed only the weather forecast for the next day, to look further is very difficult! And considering that the predicted activity of fish depends on these initial data, my prognosis of fish activity is made only for the coming 6 hours!