SweatFest.... a celebration of heat, humidity, hurricanes, and horseflies. As well as lots of mosquitos, and the occasional tropical storm. Conversely, it's also fun time for those who love the beach, snowballs, and cutting grass.
Memorial Day weekend is usually the kickoff for 90 degree days and 70 degree nights, and high humidity. At least during June there's a good seasonal breeze most of the time. But come July and August, the wind goes away and the sweating kicks up a notch. By early September, the nights are long enough for radiative cooling to take effect, even if the days are still a bit balmy.
As for tropical weather activity, we currently have Hurricane Beryl bearing down on the Texas coast, with some possible impacts to western Louisiana. At one point, Beryl made history as only the second category 5 storm in the month of July. If that's an indication, it's going to be a long season. The National Hurricane Center predicts an above-average year.
The summer sun and heat of SweatFest bring dangers to anglers. Heat stroke and high UV radiation pose threats. And for coastal fishermen, there's potential exposure to the vibrio bacteria which has the highest occurence from July through September. There are plenty of web articles on how to cope with these dangers of summer. Let Google be your friend!
Also be aware that thunderstorms can be a daily occurence in summer. At the first sign of towering cumulus clouds, start making your way back to the launch (especially if you're in a kayak). Lightning can strike from eight miles away, so waiting for lightning to approach is not a smart option!
Fishing wise, July and August on average are probably the worst fishing months of the year in Louisiana. Fish are lethargic as very warm water holds less oxygen. They feed less, and when they do, it's either very early in the morning or at night. In most cases, they move to deeper waters.
There are exceptions. In fact, offshore and nearshore fishing is the best of the year. Species such as spanish mackerel, jack crevalle, bluefish, bull reds, and sand (white) trout are abundant nearshore and inside passes and interior coastal lakes. So are gafftop catfish and ladyfish, so it's a case of avoiding them as well. And if a tropical storm moves close by - let's hope not, but if it does - the bite can be really good in freshwater lakes and in the brackish marsh.