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 heat index - 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 forecast, 2026 looks to be a fairly calm one due to a Super El Nino in the Pacific. The National Weather Service predicts a 55% chance of a below-normal season, with 8-14 named storms, and only 1-3 major hurricanes (categories 3-5). Of course, it only takes one downturn in the trade winds and with the higher-than-normal Gulf water temperatures, that one possible storm could be the next Katrina, Rita or Laura!
The summer sun and heat of SweatFest bring dangers to anglers. Heat stroke and high UV radiation require preparation for fishing trips: bring water and sports drinks, sunscreen, long-brim hats, neck gaiters, long sleeve light-colored UV shirts and pants, and sunglasses (polarized are better). 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 cumulonimbus clouds, start 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, June is usually a decent month, although the bigger fish of Spring are deeper now. Early morning and late afternoon are still good. July and August are probably the worst fishing months of the year in Louisiana. Fish are lethargic as hot water holds little oxygen. They feed less, and when they do, it's either very early in the morning or at night.
There are exceptions. In fact, offshore and nearshore fishing for pelagics is the best of the year in Summer. 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 often a case of avoiding those nuisance species. 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 just before and after the storm.