What is your first thought when you order wine? Red or white correct? But in Europe many people drink Rose, with an accute e, when it is hot. In America we have the misnomer of white zinfandel which is actually like a rose, but much sweeter. Last year I also saw some white merlots which are similar.
I first tasted rose as a kid in Portugal drinking Mateus Rose, great flagon shaped bottle, you can get it over here. Not sure if it was that I was allowed wine by my parents or the shape of the bottle that I liked most. It is not really sweet, but fruity and slightly bubbly, but only slightly. The Portuguese make a lot of young wines, to be drunk young and with low alcohol levels called Vinho Verde, green wine is the translation, although it looks white, served chilled like the rose and these can be fruity and light very refreshing on a hot day, which you get a lot of in Portugal. Also just because they are young wines don't get mistaken to think these were cheap wines, some Vinho Verde are very expensive.
The French also have lots of rose wines drunk as an aperitif before a meal, and they also will add a little cassis to a white wine to give it a pink tinge, often called Kir, if you use champagne Kir Royale, very nice. So with summer approaching and hot days ahead think of a nice cool glass of rose to have as an aperitif or with a nice summer BBQ. It might go quite well. If you search you may find the odd Vinho Verde over here, but whilst I said they can be expensive it is usually a cheap wine and does not necessrily travel well.
Also I have memories from when we rented a villa for a summer holiday in Portugal of taking a large empty bottle to the winery, or even the local store and filling it very cheaply with either the local red or white wine, so I am a little biased in relation to this. But then I also have memories of lunches in restaurants including wine that cost just a few dollars that included starters with bread, tapenades, cheeses followed by grilled Piri-Piri Chicken, slightly spicy and served with french fries all washed down with wine - delicious, of course the Portuguese also take long siestas in the afternoon to keep out of the heat, understandable really.
Another great standby for the summer is Sangria, red wine steeped with citrus fruits and then with sprite/seven-up added and served with the fruit. Some people use club soda but add sugar, this gives you a little more control of the sugar content than using canned or bottled soda, whatever is your taste. Again this is often drunk as an aperitif and at lunchtime. Heavier reds and more developed whites being drunk in the late evening after the siesta with dinner and it might not start till nine or ten o'clock when the heat of the day has passed a little.