When Summer Feels Heavy: Understanding Seasonal Affective Disorder in Houston
As the summer heat is starting to kick off, I wanted to take some time to talk about Seasonal Affective Disorder, or SAD. Most people know of SAD as the “winter blues”. That form of depression that settles in with the gray skies and short days of winter, leaving people feeling flat, sluggish, and disconnected until spring finally arrives.
But here in Houston, I frequently notice the season that seems to hit people hardest isn't December or January. It's June, July, and August. While our winters can be relatively mild weather wise, the summer months tend to have people trapped inside avoiding the heat.
If you've ever found yourself dreading summer, feeling irritable or low for months on end, withdrawing from the things you usually enjoy, or just feeling like something is off every time the heat rolls in, you might be experiencing summer-onset SAD (sometimes called reverse SAD). In a city like Houston, with the extreme heat and humidity, it's more common than most people realize.
Let's talk about what it is, why it happens here, and what you can do about it.
What Is Seasonal Affective Disorder, Really?
Seasonal Affective Disorder is a subtype of depression that follows a predictable seasonal pattern. Symptoms emerge at roughly the same time each year, persist for weeks or months, and then lift when the season changes. According to the American Psychiatric Association, about 5% of adults in the U.S. experience SAD, and it can last for around 40% of the year.
While winter-onset SAD gets the most attention, research and clinical experience both confirm that some people experience a summer pattern instead. The symptoms look a little different from the winter version, and so do the triggers, but the impact on daily life can be just as significant.
Summer SAD symptoms often include:
Irritability, agitation, or mood swings
Difficulty sleeping or restless sleep
Decreased appetite
Anxiety or a feeling of being on edge
Low motivation or fatigue
Withdrawing from social activities
A persistent low mood that doesn't match your circumstances
If you notice yourself feeling this way every summer, the pattern shouldn’t be ignored.
Why Houston Summers Are a Perfect Storm
Houston summers are no joke. We're talking about months of temperatures regularly above 90 degrees, humidity that makes it feel even hotter, and heat indices that can push well past 100. The sun is intense, the air is heavy, and going outside for more than a few minutes can feel genuinely miserable. For some people, this kind of environment doesn't just feel uncomfortable, it disrupts the body in ways that can trigger depression.
Here's what's happening beneath the surface:
You're spending more time indoors and getting less sunlight than you'd think.
This might seem counterintuitive. Summer means more sun, right? But when the heat is extreme, most of us adapt by staying inside with the air conditioning running. We stop taking walks, skip weekend activities, and avoid being outside during peak hours. As a result, you can end up vitamin D deficient and cut off from natural light in the summer, not the winter. Less sunlight affects serotonin levels, the brain chemical most closely tied to mood, and can disrupt the circadian rhythm, your body's internal clock that regulates sleep, appetite, and energy.
The heat itself affects your brain chemistry.
Research has shown that high temperatures and humidity can lead to physiological changes including increased heart rate, dehydration, and electrolyte imbalances, all of which can contribute to fatigue, irritability, and mood disturbances. Serotonin, a neurotransmitter that regulates mood, actually fluctuates with temperature. Prolonged heat exposure can also disrupt melatonin levels, making restful sleep harder to come by. Poor sleep and depression are deeply linked, and a Houston summer offers plenty of opportunity for both.
The longer days throw off your sleep.
The extended daylight hours of summer, with the sun rising early and setting late, can interfere with the body's sleep-wake cycle. It’s common for people to stay up later as the sun is up later, leading to less sleep. For people who are already sensitive to light-dark changes, this disruption to circadian rhythm can be enough to tip the nervous system into depression.
Social isolation creeps in.
In cold climates, people hibernate in winter. In Houston, the equivalent is summer. Outdoor events get cancelled. Parks and trails feel unbearable. Kids are home from school, routines go out the window, and the spontaneous social moments that keep us connected, a walk with a neighbor, a weekend at the park, a quick errand on foot, disappear. Isolation is one of the most significant contributors to depression, and Houston summers create a lot of it.
There's a grief piece, too.
For many people, summer is supposed to feel like freedom. It carries cultural expectations of joy, vacations, outdoor adventures, and ease. When summer instead feels oppressive and you're stuck inside feeling low, there can be a layer of grief, confusion, or shame on top of the depression itself. "Why do I feel this way when everyone else is out having fun?" That question is one I hear often in my office around this time of year.
Tips for Managing Summer SAD
1. Protect your sleep.
Sleep is foundational to mental health, and it's often the first thing the summer disrupts. Blackout curtains can help block the light that signals your brain to stay up late or wake up too soon. Keeping your bedroom cool, aiming to go to bed and wake at consistent times, and reducing screen exposure before bed all support a more regulated nervous system. It doesn't have to be perfect, but even small improvements in sleep quality can shift your mood meaningfully.
2. Find ways to get outside safely.
Even in Houston summers, there are windows of time that are more manageable like early morning before the heat builds, or in the evening after it eases. Getting some natural sunlight exposure, even just 15 to 20 minutes, supports serotonin production and helps regulate your circadian rhythm. If going outside truly isn't an option, positioning yourself near a window during daylight hours can also help.
3. Move your body, even gently.
Exercise is one of the most well-researched tools for managing depression. It supports the release of serotonin, dopamine, and endorphins, all chemicals your brain is likely running low on. That doesn't mean you need to train for a 5K. A 20-minute walk before the heat rises, a yoga video in your living room, or a swim at a local pool all count. The goal is to move in a way that feels sustainable and kind to your body.
4. Stay connected to people.
I know it can feel harder to socialize when you're already depleted, and when the heat makes everything feel like an effort. But isolation tends to feed depression rather than relieve it. You don't have to show up perfectly. Text a friend. Meet someone for coffee in a cool air-conditioned cafe. Say yes to one low-effort invitation. Our nervous systems regulate best in the presence of safe, caring people, making time with friends more healing than you would think.
5. Build predictability into your days.
When summer disrupts your routine, whether through school schedules changing, travel, or just the loss of the activities you'd normally do, your nervous system loses some of its anchors. Depression tends to deepen when everything feels uncertain and unstructured. Creating small points of consistency, a regular wake time, a morning routine, a predictable dinner rhythm, gives your nervous system something to orient around.
6. Stay cool and hydrated.
This might sound overly simple, but chronic dehydration and heat exposure have real effects on brain function and mood. When your body is physically stressed, your emotional resilience takes a hit. Prioritize hydration, stay out of peak heat, and give yourself permission to take it slow on the hottest days.
How Therapy Can Help
Managing SAD on your own with good habits is possible. But there's a limit to what we can do alone, especially when the depression has been building for months or when life circumstances make self-care feel impossible.
Therapy offers something that no amount of self-help can fully replicate: a consistent, safe relationship where you can slow down, make sense of your patterns, and start to shift the ones that are keeping you stuck.
In my work with clients experiencing seasonal depression, I often draw on approaches like:
ACT (Acceptance and Commitment Therapy): which helps you stop fighting against difficult emotions and start moving toward the life you actually want, even when things feel hard.
Nervous system regulation:because SAD isn't just an emotional experience, it's a physiological one. Learning to support your nervous system directly can create meaningful relief.
IFS (Internal Family Systems):which is especially helpful when there's a part of you that feels ashamed of struggling, confused about why summer is hard, or convinced you shouldn't feel this way.
EMDR:which can help if past experiences are intensifying how you're responding to current stressors.
Therapy also gives you space to process the grief that can come with summer SAD, including the sadness of not enjoying a season that feels like it's supposed to be fun, and the frustration of feeling like your body and brain aren't cooperating with the life you want to live.
You Don't Have to White-Knuckle Your Way Through Summer
If every summer feels like something you have to survive rather than enjoy, you're not being dramatic. You're dealing with a real, recognizable condition that has real, effective treatment.
Houston summers are hard enough without carrying unaddressed depression on top of them. You deserve support.
If you're ready to understand what's happening and start feeling better, I'd love to work with you. I offer trauma-informed therapy for adults and teens in person in Houston Heights and through secure online therapy across Texas and Colorado.
You don't have to wait until fall to feel like yourself again.
