What to expect
The weather in any canyon can change dramatically from moment to moment so one should always come prepared, no matter what the season, with a wide variety of clothing. We recommend you always buy your own Trip Insurance when traveling in the Canyons in the wintertime (November - March) as the roads can be treacherous at times and the train tracks do get icy, all of which can lead to delays or unexpected problems or cancellations.
Upper Sierra Region such as; Creel, Cerocahui, Divisadero, etc...are like this
Rainy from the end of June to end of August. Windy from March through April. Winter from the end of November to the end of March,sometimes even stretching on through April. Fall is Sept. through mid-November and Spring is April through May.
Winter is November to March and it freezes at night but daytime temps can be as high as 65 on certain days if sunny. Spring is April to Mayand warms up to about75 during the day with still freezing temps at night until the end of May. Summer is June to late August and it rains every day with temps not going over 85 usually on a sunny, non-rainy day. Fall is September to October and is lovely with normal fall weather. I still have plants growing until November at times.
Layers are great year around in the Upper Sierra as the summers are a bit hot in the middle of the day but still cool in the mornings and evenings. The winters can be really cold in the morning and at night but may warm up a bit in the afternoon so that a heavy coat is not needed, only perhaps a heavy sweater instead.
Canyon Bottoms, such as; Batopilas, Urique, etc... are like this:
Temperatures at the bottom of any canyon are always HOT, even in Winter months, just more mildly so, but in the summer they can get up to 130 degrees. In winter time they stay comfortably hot at around 85 or so, fluxuating throughout the day and depending largely upon the weather in the upper Sierra. For example, if it is raining or snowing in Creel, the weather in Batopilas is likely to be slightly cooler and overcast or even lightly misting or raining.
El Fuerte and Los Mochis are in the same temperature range as the canyon bottoms as they are at roughly the same elevation, just above sea level.