The dividing point between always warm at dawn and "can see my breath on winter nights" is Manzanillo. Why (?) is anyone's guess. Two hundred and fifteen miles to the north it can be 55F, while it's 73F here at dawn in the winter.
The "clouds" mentioned (In January) can turn an uncomfortably warm afternoon to near paradise. For comfort, I prefer summer. When the stacked clouds roll south off the Sierra Madre. I rejoice.
Some folks do not mind swimming in 68F ocean. I prefer 15 degrees warmer, thank you.
I spent a summer in Mazatlan years ago. Near Olas Altas. Took the blue & white air conditioned bus to the mercado municipal. Southwest corner has a 2nd story set of loncherias. Then, two dollar complete lunches. Sat out on the veranda watching Peregrine Falcons selecting fat pigeons. Their stoops were breath taking. Their nests were high in inaccessible nooks on buildings.
Those were the days of truly inexpensive camarones. As long as my index finger. I selected "cristales". They used to cost less. Their shells were ivory and tan instead of distinctly striped. Critales weren't as "pretty" when they were uncooked. But cooked, they were indistinguishable from regular shrimp.
The road into Empalme Sonora (off Mex 15) used to have a lineup of tarp and 2x4 stalls that sold shrimp. Probably not there anymore.
I really do not feel close to home until I clear Cerro de Ortega, southbound. Counting all expenses, I can head south to Tapachula and the Guatemala border AND RETURN for fewer pesos than it costs just on a 1-way trip to Nogales.
Barra is about the furthest north I will go and that is just to work on cruising saiboats and permit Jesus to sell his lobster to Cruisers. They love it and it is absolutely licensed and legal. But Zuhuatanejo is half the distance, and the girls love to swim at Playa Ropa. The bay is warmer than the open ocean by several degrees F.
I also found favor with Puerto Escondido. But the surf is dangerous for me. From there, the border tempts me and spending time at Lago Atitlan is appealing.
There is tourist Mexico and then the other part - the part that I bought New York Steak today. Unbelievably tender but little fat. Custom cut 2-fingers thickness. Converted to dollars $3.59 per pound.
I avoid tourist areas like the plague. It's not just the business owners fleecing the tourists -- the real problem is the property owners who charge unbelievably high rents.
When I am forced to go north, I jog several miles off the hwy toward a small town. Ask the counterperson where the best grub is. Load up with tamales and empanadas at the gasolineras.
Small hotels try the same trick as the RV Parks. When I run into 5-700 peso flea farms, I head for the gasolinera, then flip the catch on my seat back.
Mexico can be inexpensive if a person is unfamiliar with how Mexicans do things.
For seventy pesos I eat like a king with the comida corrida (dinner special)