Getting Enough Calories in this Heat...

I always have this problem when I'm out and it's hot. You might try some cold proteins, like a bean salad, quinoa salad, or tuna salad. I find they go down a bit easier than something like a steak or chicken breast. I also get significant amounts of protein from dairy such as yogurt and low-fat milk. You could even do a smoothie with frozen fruits, some Greek yogurt, and a scoop of protein powder (I usually use whey, but any plain one would work).

I also usually end up eating more during the cooler parts of the day, like early morning or late evening, and mostly fruits and veggies with a few nuts during the hotter parts of the day.

Hope you find something that works for you.

I find that I don't feel like eating so much when it's really hot (wish it was hot now, I'm in winter!), but I think it's important to stay within reasonable range of your calorie goal. Not that you want to stuff yourself if you don't feel like it, but my personal opinion is that my body needs to learn that it is getting a regular amount of food, and I try not to go too low or too high.

Maybe look at smaller meals/snacks more often, or add in a few higher calorie things - salad with avocado or cheese, whole milk with cocoa and cinnamon (my alternative to prepackaged chocolate milk), smoothie with yoghurt and banana - that kind of stuff.