I am certainly not gonna critique anyone else's choice for carry ... hey, at least y'all are carrying ... but I have never really understood the notion that one needs to go to a tiny handgun during warmer weather. Having lived in Arizona, I still often carried a full-sized pistol (1911 or a SIG), never needing anything other than a good pancake OWB or an IWB holster and a slightly looser-fitting, untucked shirt.
My favorite spring and summer carry remains what I carry in the dead of winter or late fall ... a SIG P-227/228/229, often a Commander-sized or 5" barreled 1911 ...
I did recently, however, discover the SIG P-938, so there's a possibility that a little-bitty gun may be added to the mix ...