Hell, it's so hot where you live that you <font color=red>*</font><font color=red>*</font><font color=red>*</font><font color=red>*</font><font color=red>*</font> out with a .32 ACP, most of the time. I big knife weighs a lot more than a Kahr PM9, and aint anything like as concealable. There's no reason whatsoever to have a big knife and no gun.
Yes, it is hot here, very hot. In the heat of the summer I usually wear shorts and a loose fitting button up shirt. Common attire here and a cool way to dress in this climate which kind of resembles Tunisia.
Actually, the smallest thing I'll normally carry is a .380ACP or a 9x18mm, but I can also CCW an M1911A1. When I'm riding my mountain bike, usually out on the Indian reservation, I'll normally wear a shoulder holster or a secure belt holster, like my M1911A1 in a Bianchi UM-84 (in addition to a 3 liter Camelback hydration bladder).
There's no reason whatsoever to have a big knife and no gun.
There's an old axiom that says, 'Sh1t Happens'. You should heed that.
Out in the field, backpacking or even after SHTF, you should have with you, on your person or in your pack, either a big knife like a khukuri or a hatchet, in addition to a smaller knife.
Not only is it an excellent field tool, the khukuri has enough power that you can kill, disable, or impair the fighting ability of someone with a solid strike on almost anywhere on the body.
A well made khukuri, like one from Himalayan Imports, can cut a man's head or forearm off in a single blow, or disembowel him with a single thrust (you thrust the blade in and, due to it's shape, it naturally opens up the entire abdominal cavity when you yank the blade out).
In one knife style slice across the throat, the khukuri can sever all of the vessels and the windpipe. With one solid whack it can take off the entire head. Also, like a hatchet, you can kill someone simply by whacking them with a solid blow to the skull. You can also sever a spine with a solid strike to the centerline of the back. A blow that hits the face can take out an eye, cleave the nose in half into the sinus cavity, cleave the entire face in half into or past the cheekbones, or sever the jaw, either partially or completely.
If they try blocking with an arm or trying a swing or a thrust at you, you can split a hand lengthwise to the wrist or beyond, sever a hand, whack off all of the fingers in a single pass, or sever the arm, cleaving either through the entire arm or at least one bone of the forearm.
A khukuri can serve well as either a hatchet, machete, knife, or short sword. Unlike a hatchet though, you have between 7" and 10" of sharpened surface (or more, depending upon the model) instead of the normal 2.5" to 3" of the hatchet. Unlike a hatchet, you can thrust with it and it's better for slicing during a fight. It's also easier and faster to sheath and unsheath than a hatchet. However, unlike a sword or a machete, it tends to be more compact and handier to use as a general field tool and to pack around as a secondary weapon.
A weapon like the khukuri is also silent (the possible screams of your opponent not withstanding), and the length gives you a serious reach advantage over your opponent.
The khukuri (kook-ree, a derivative of a Greek word for 'razor') is the descendent of a Greek military weapon introduced into the areas of modern day India, Pakistan, Nepal, and Afghanistan by the troops of Alexander the Great.
It doesn't have to be a 'big' blade. A well made medium sized blade like a Kabar, a Buck 119, a Cold Steel Recon Tanto, a Buck 105, Cold Steel SRK, Schrade 137, a Katz Tanto, etc, make good fighting knives in addition to being good field knives.
A person should learn to be proficient in weapons other than firearms. To do otherwise is both lazy and shortsighted. You have to have the gear and practice with it before you seriously need it.