Yes, evening will be chilly
It is required to have a Passport, Passport Card or a REAL ID to return and travel through and from Mexico. Upon returning to the US if you have a Passport Card or a SENTRI pass you can use the "Ready Lane" for a quicker exit back to the US.
https://www.google.com/maps/dir/35.3515603,-119.0576293/san+ysidro+ready+lane+entrance/@33.9498094,-119.1640057,8z/data=!3m1!4b1!4m9!4m8!1m1!4e1!1m5!1m1!1s0x80d948fc3064e689:0x9459fbfa1df2fff2!2m2!1d-117.0294538!2d32.5430155
Yes, we personally prefer to enter through Tecate. It is in easy drive that is less chaotic and enters into the Valle De Guadalupe. https://www.google.com/maps/search/tecate+border+crossing/@32.5768692,-116.6286839,17z/data=!3m1!4b1
https://es.wikipedia.org/wiki/Valle_de_Guadalupe_(Baja_California)