How the change in seasons can impact your blood pressure

You might not think of the seasons as a blood pressure risk factor. But research shows that blood pressure often rises in the cooler months and falls in warmer months. Average systolic blood pressure is 5 mmHg higher in winter than in summer, according to a 2009 study published in the journal Archives of Internal Medicine. 

These changes can matter, especially for people who already have high blood pressure or take medication to manage it. A seasonal change in readings may not seem dramatic day to day. Over time, however, it can make blood pressure harder to manage. Knowing how the seasons may affect blood pressure can help you recognize patterns and take steps to protect your heart health year-round.

Key takeaways

• Blood pressure typically rises in winter and falls in summer. That seasonal swing can add up to roughly 5 mmHg on average, based on research tracking blood pressure across the year.

• Cold weather narrows blood vessels, making the heart work harder and raising blood pressure—cold can also activate nervous system responses that tighten vessels further

• Heat widens blood vessels and can lower blood pressure, but it also raises the risk of dehydration, dizziness and heat sensitivity from certain medications

• Winter mornings carry added cardiovascular risk. The normal morning blood pressure rise is often stronger in cold months, which may help explain why heart attacks and strokes are more common in winter.

• Daylight and seasonal habits matter too. Reduced daylight, less physical activity, richer sodium-heavy foods and cooler indoor spaces can all push blood pressure higher in colder months.

• Small, consistent habits help year-round: regular monitoring, staying active indoors when needed, staying hydrated, dressing for the weather, and watching sodium intake during holidays

• Never adjust blood pressure medication on your own. Talk to a healthcare provider if you notice a seasonal pattern in your readings.

Seasonal changes can impact blood pressure

It’s true that normal fluctuations in the weather throughout the year can play a role in your blood pressure. Below we’ve answered some common questions people have about how blood pressure can be affected by the seasons: 

Do cold temperatures raise blood pressure?

Yes—cold temperatures raise blood pressure. When you are cold, your blood vessels narrow, raising your blood pressure and making it harder for your heart to pump blood through the body. Cold weather may also activate the nervous system in ways that further tighten blood vessels and increase blood pressure.

Does daylight play a role? 

Yes. Daylight helps regulate your body's internal clock, which influences blood pressure and other cardiovascular functions. Researchers have found that seasonal differences in daylight may contribute to some of the blood pressure changes seen throughout the year.

Does the time of day impact blood pressure?

Yes, the time of day also impacts your blood pressure. Blood pressure normally increases after you wake up. In colder months, that morning rise may be stronger. Winter mornings may be one of the most high-risk times thanks to the several factors —low temperature, waking up and the beginning of physical activity—according to a 2026 Japanese study published in the journal Hypertension. Feeling cold, getting out of bed and starting daily activities can all place added demands on the heart and blood vessels. Some researchers believe this larger winter morning rise may help explain why heart attacks and strokes are more common in winter.

Can shifting habits change blood pressure?

Yes—changes in your habits can alter blood pressure. The seasons can impact your daily routines in ways that matter for blood pressure. During colder or darker months, many people move less. Less physical activity can make blood pressure harder to control. Between holiday meals and winter comfort foods, many people eat richer foods that are high in sodium in the winter, which can also raise blood pressure. 

Weight changes may play a role too. Carrying extra weight can make the heart work harder, which can contribute to higher blood pressure. 

Indoor temperature also affects blood pressure. Cool indoor spaces may keep blood vessels more constricted. Warmer indoor temperatures have been linked with lower blood pressure readings in some studies.

Can heat bring its own challenges?

Yes. Heat can create challenges when it comes to heart health. Warm weather may lower blood pressure because blood vessels widen. But heat can still stress the heart. Hot temperatures increase sweating and fluid loss, which can contribute to dehydration, dizziness, lightheadedness or changes in blood pressure. Certain blood pressure and heart medications can also make some people more sensitive to heat. If you take medication, keep taking it as prescribed unless your healthcare provider tells you otherwise.

Can I manage seasonal changes in blood pressure? 

Yes, you can manage seasonal changes in blood pressure. You cannot control the seasons, but you can take practical steps to support your blood pressure throughout the year. Here are some important steps to take: 

1. Monitor your blood pressure regularly

Checking your blood pressure regularly is one of the best ways to understand your own patterns. Try to measure it at consistent times and track trends instead of focusing on one reading. Over time, you may notice if seasonal changes are impacting your blood pressure.

2. Stay active in every season

Regular movement helps support healthy blood pressure. When the weather makes outdoor activity harder, look for indoor options. You might walk inside at the mall, try an exercise video, or take a fitness class. Find ways to move consistently in every season.

3. Stay hydrated

Drink fluids regularly, especially when you are spending time outdoors in hot weather. Watch for signs of dehydration, such as thirst, dark urine, dizziness or lightheadedness. If you’ve been told to limit fluids because of a heart, kidney or other health condition, follow your healthcare provider’s guidance.

4. Stay comfortable in hot and cold weather

In cold weather, dress in layers, limit long periods in extreme cold, and keep your living space comfortably warm when possible. In hot weather, seek shade or air conditioning, avoid strenuous outdoor activity during the hottest part of the day, wear lightweight clothing, and take breaks to cool down.

5. Pay attention to seasonal eating habits

Seasonal routines can change what and how much you eat. During holidays or celebrations, be mindful of sodium-rich foods and alcohol intake. When you can, build meals around fruits, vegetables, beans, whole grains, nuts and other nutrient-rich foods that support healthy blood pressure.

6. Don’t change medication on your own

If your readings consistently rise in colder months or fall in warmer months, ask your healthcare provider what that pattern may mean for you. Some research suggests that medication timing or adjustments may help certain people manage predictable seasonal changes, but those decisions should always be made with your doctor.

The bottom line

Seasonal changes can raise or lower blood pressure through a mix of temperature, daylight, hydration and everyday habits. Monitoring your blood pressure, staying active, eating well and preparing for weather extremes can help you through seasonal changes. If you notice a pattern or have concerns about your readings, talk with your healthcare provider.