The heat is making your partner more annoying – here's the science behind it

They loaded the dishwasher wrong again.

They keep making rubbish jokes.

Their breathing is unreasonably loud.

Irritation at your partner is a common occurrence in any relationship. Other people are annoying – that’s just the reality – and when you’re in a long-term relationship with someone, you get to see all their worst quirks up-close and on repeat. Nobody’s perfect… and don’t you know it.

But while a little friction between two people in a relationship is normal, there are times when all that irritation becomes a bit, well, irritating. And surely it can’t be good for your health to be constantly wound up by the person you spend the most time with?

Perhaps, too, you’ve recently noticed your annoyance at your other half reaching new heights. You know, the heights that make you scream: ‘My husband is driving me insane!’

If so, take solace in the knowledge that you’re not alone – and there’s a scientific reason why your partner is so irritating at the moment. You can blame the hot weather.

As Rachel Lambert, the founder of Braincode Centers and a certified expert in neurofeedback, explains, this is down to the heat competing with your brain for resources, which can make you especially prone to irritation.

‘What you experience as unusual irritability in a heatwave is your brain operating on a reduced budget,’ Rachel says.

‘The hot weather does indeed affect our brain and thinking,’ agrees neuroscientist Dean Burnett. ‘A lot of it will be indirect. The brain is the most demanding organ in the body, and needs a constant supply of blood, oxygen, resources, all of which are supplied by the body. When we get too hot thanks to the weather, as mammals, our bodies are working harder to keep our core temperature at its usual level, through excess sweating, more blood being sent to the surface of our skin to radiate heat, and so on.

‘All this means there are fewer resources than usual to supply the brain. Add loss of water causing dehydration, and our brain has less power than it does during cooler weather. At the most basic level, when we’re hot and can’t do anything about it, we’re stressed and distracted, so our brain has more to think about and deal with, reducing our ability to focus on other things.’

There’s research that links increased temperatures with increased discord – a 2024 study found that a 10° increase in temperature increased the risk of violence by nearly 10%. The heat might make you more prone to reading negativity into your partner’s tone, too. In one study, researchers found that when they put students in a hotter room, they tended to rate the hostility level present in videos of couples having a conversation as far higher than students who sat in a comfortable temperature.

So here’s a fun dual impact of the heat: it might make your partner more likely to behave in an irritating way (they’re not able to think things through as well, and are more prone to impulsive actions like chucking the laundry down the stairs instead of responsibly carrying it down) and it also makes you more likely to be irritated by that behaviour. Decision-making skills take a hit, too. As does memory. And emotional reactivity rises. All around, frustrations become more common, and the potential for little quibbles to tumble into fully-fledged screaming matches reaches a fever pitch. It’s a wonder any of us make it out of summer still coupled up.

It might feel like the ideal solution is to separate for the summer or to stay in a nice air-conditioned igloo, for the sake of your relationship. Neither of those options is particularly practical, so we asked experts for their advice on how to navigate the irritation factor ramping up along with the temperature.

Acknowledge the heat’s impact

It’s helpful to know that the heat is raising your irritation levels, and to flag this impact in conversations with your partner.

‘Irritability is fundamentally about discomfort,’ says couples therapist Danielle Sethi. ‘When our bodies are already uncomfortable from the heat, we have far less capacity to regulate emotions like annoyance and anger, which tend to physically heat the body even further. Couples can name this early, before it turns into a bigger conflict. A simple check-in like, “I’m noticing I’m a little on edge today” can prevent small friction from snowballing.’

Discuss sleeping arrangements early

The benefits of ‘sleep divorce’ – for both your sleep and your relationship – are well-covered and become all the more relevant when temperatures climb. Getting a decent night’s rest is hard enough when you’re tossing and turning in a pool of your own sweat, let alone when you throw someone else’s body heat into the mix. And the resentment that builds as a result of a run of rough nights isn’t great for any relationship.

Joanna Harrison, a couples therapist and the author of Five Arguments All Couples (Need To) Have, recommends discussing sleeping arrangements before bedtime rolls around.

‘This is probably better negotiated in the daytime than in the middle of the night, when you are hot, bothered and half awake, and arguing about whether the window can be open or not,’ she notes. ‘Putting a little bit of forward thinking into it could be helpful: would it be a good idea for one of us to sleep in the spare room or on the sofa?’

Have (cool) fun together

‘Working together to stay cool and maintain hydration can allow you and your partner to find creative ways to stay connected,’ advises Andrea Wiggs, a licensed associate counsellor at Selenium Therapy and Wellness Center, who specialises in couples and family therapy. ‘This can include engaging in fun activities like going for ice cream, treating yourselves to your favorite iced beverage, going to the movies, enjoying a good read at a local library or bookstore, taking an evening walk, or staying home to enjoy a fun board game or puzzle. These low-effort activities can help you and your partner to preserve energy and encourage gentle intimacy without the stress of overexertion.’

Take a cold shower when you get home

‘You can’t just talk your way out of a nervous system that’s overheated, you have to cool the body first,' says Danielle.

We need to take practical actions to cool down, which might involve getting a reliable fan or, as couples therapist Thomas Westenholz advises: ‘Take a cold shower before speaking.’

A cold shower after a flustered, sweaty commute has the added benefit of creating a clear demarcation between work and quality time with your partner. It’s a reset, letting you leave the day (and the heat) behind and emerging clean, cool and renewed.

Consider the deeper issue

While the heat will shorten your fuse, it can’t be entirely blamed for an explosion about something that’s been bugging you for months… or years.

‘The possibility is that the heat is a stressor that brings out something that is bothering us deeper down,’ says psychotherapist and couples therapist Katherine Young. ‘We need to look into ourselves to see what that could be. Is it something from our own personal past that we need to work on? Is there a real issue in your relationship that you need to address?’

But equally, don’t build up issues that aren’t really there

On the flipside… sometimes it really is just a small annoyance that feels especially maddening because the sun has given you a headache.

Cheryl Groskopf, a therapist specialising in helping married couples, tells us: ‘One thing people don’t realise is that our brains are constantly trying to explain our internal state. That’s why couples sometimes become convinced there’s a problem with their partner or relationship when they’re really dealing with dehydration, poor sleep, sensory overload or relentless heat.

‘The mistake couples make is treating every irritated feeling like it’s meaningful information about the relationship. One of the healthiest habits couples can build is asking, “Is this actually about us, or is my brain trying to explain why I feel so uncomfortable right now?” That tiny one-second pause interrupts one of the brain’s favourite habits: turning physical discomfort into interpersonal conflict.’

Don’t tell your partner ‘you’re so annoying’

As satisfying as it might feel to say that to your spouse, all the experts we spoke to advised against it. You can still express your feelings, but in a less hurtful way.

‘Focus on the behaviour, not the person,’ says marriage and family therapist Tina Shrader. ‘Saying “You’re being annoying” almost always invites defensiveness because it sounds like a character judgement. Instead, describe what happened: “When you interrupted me a few times, I noticed myself getting frustrated”. Sticking to the behaviour keeps the conversation about the moment instead of turning it into an attack on the relationship.’

Remember issues don’t need to be solved right now

Let’s say the heat has made you irritated enough to finally bring up how frustrated you are by your partner forgetting to take the bins out after weeks of missing the recycling collection. That’s fine, it happens. But don’t feel like you need to come to a resolution right now, when your decision-making skills may be impaired by the heat and emotions are running high.

Psychologist and founder of SelfWorks Amy Vigliotti advises: ‘Just remember: conflict doesn’t need to be immediately solved. That’s something most couples forget. On a super-hot day, both people are heated. There’s always the option to prioritise cooling down, drinking water, rehydrating, taking care of your physical comfort. When emotions are running high, the priority should be regulating ourselves.’

Make sure you’re maintaining intimacy

‘The heat changes how much touch and closeness people are interested in,’ notes relationship therapist Ilana Grines.

‘Less cuddling and physical intimacy in the summer is something I see often.’ The solution to this is not to push forward when sex is the last thing you want to do, but to ensure you’re maintaining intimacy in other ways when physical touch is less appealing. Think: quality time, deep conversations, acts of service (like refilling the ice tray).

Ilana adds: ‘Making sure we don’t interpret less physical touch as rejection is important. It’s worth saying that out loud: “I love you… but it’s too hot to be touched right now” prevents a lot of other arguments that occur when temperatures spike.’

Remember you love each other

As maddening as your partner might be right now, you did get together for a reason. Remind yourself of that.

‘Hold on dearly to the idea of the person you fell in love with so you can tap into your true feelings for them,’ offers up relationship therapist Adam Stanford. ‘Picture them smiling at you, recall sweet things they’ve said about you, or reflect on nice things they’ve done for you. Take a moment to pause before speaking and tell yourself, “I’m going to treat them like someone I love because I do, even when I’m annoyed.”

‘Remember that you’re not perfect, either. Think about things they may not love about you and consider how you want them to handle those. Examine how you might be holding them to a double standard and ask yourself how compassion could change that.’

Ask yourself one simple question

Couples therapist Mary McLaughlin suggests: ‘Ask yourself, “How do I want to show up in my relationship right now?” That simple question shifts the responsibility back to you. Do you want to be harsh and critical or do you want to be friendly and open? Hot weather may cause some irritability, but that’s not an excuse to lash out at your partner. If you watched a movie of how you’re interacting with your partner right now, would you feel proud of what you see?’

Take the easy route

Now is the time to take things slowly. Give yourself permission to take the easier route.

‘In extreme heat conditions, the body must work harder to stay cool,’ says Andrea. ‘This process drains our physical, mental and emotional reserves. You and your partner should consider making adjustments to your typical routine to accommodate the given circumstances and alleviate stress. This can be achieved through simplifying household chores, switching strenuous activities to cooler parts of the day and limiting social engagements.’

And yes, it’s totally fine to have ice cream for dinner if that prevents you screaming at your other half.

Ellen Scott

Freelance Writer

Ellen Scott is a freelance writer and editor covering all things lifestyle, royals, celebrities, and entertainment for Good Housekeeping. As the author of Working On Purpose, she’s an expert in the world of careers, and previously covered features on everything from relationships to mental health for Stylist and Metro.