Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Los Cabos to Culiacán as you normally would.
The most flights from zzKPG to CUL are scheduled on a Monday (2 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (2 on average).
In terms of precipitation, rainfall in Culiacán ranges from 0.0 - 6.3 inches per month. August is typically the wettest month, when rainfall can reach 6.3 in. January is typically the driest time to visit Culiacán when rainfall is around 0.0 in.
If weather is an important factor for your trip to Culiacán, use this chart to help with planning. For those seeking warmer temperatures, June is the ideal time of year to visit, when temperatures reach an average of 84.2 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 66.2 F).