As summer temperatures climb, drivers of electric vehicles (EVs) and hybrids need to keep a few important things in mind to protect their vehicles, extend battery life and stay safe on the road. While modern EVs and hybrids are engineered to handle extreme conditions better than ever, hot weather can still take a toll if drivers aren’t prepared.
Battery performance and range can dip
One of the first things new EV owners might notice during a heat wave is a dip in driving range. High temperatures force a car’s battery management system to work harder to keep the pack cool, which drains energy that would otherwise power the car. According to studies by AAA and battery research groups, EV range can decrease by 15% or more on very hot days. Hybrids don’t rely solely on their batteries, but they can still see reduced efficiency if heat causes the internal combustion engine to run more often.
To offset the hit to range, it helps to park in shaded areas or garages whenever possible, as this keeps the battery cooler before the next drive. Using pre-conditioning — which allows drivers to cool the cabin while the vehicle is still plugged in — can also minimize energy use from the battery once on the road.
Charging takes longer — and can degrade batteries faster
In hot conditions, many EVs slow charging speeds automatically to avoid overheating the battery. This is particularly noticeable at DC fast chargers, where heat can limit charge rates significantly. Some newer models have advanced thermal management that helps, but drivers should plan for longer charging times during extreme heat.
Long-term exposure to high temperatures can accelerate battery degradation, shortening the overall lifespan of the pack. Charging to 100% in hot weather or leaving the car fully charged in the sun for hours can make this worse. Experts recommend charging to 80% during heat waves if the extra range isn’t necessary, which reduces battery stress.
Keep an eye on tire pressure and fluids
Whether driving an EV, a plug-in hybrid or a traditional hybrid, tire pressure is a critical yet often overlooked factor in hot weather. Tires expand when heated, which can lead to overinflation and uneven wear. Checking tire pressure regularly — ideally when tires are cold — helps maintain proper traction and extends tire life.
Hybrids with internal combustion engines still need engine oil and coolant checked and changed according to manufacturer schedules. While pure EVs don’t have engine oil, many use coolant for the battery and power electronics; low coolant levels can cause overheating issues. A quick look under the hood or a scheduled service appointment before peak summer can prevent bigger problems.
Use climate control wisely
Blasting the air conditioning keeps drivers comfortable but eats into range fast. Setting the cabin temperature a few degrees higher than usual and using the car’s eco or energy-saving modes can reduce power draw. Many EVs allow drivers to schedule cabin pre-conditioning while the car is plugged in at home, which cools the interior without draining the battery during the drive.
Plan ahead on long trips
Drivers should map out charging stops with extra time and consider alternative routes in case stations are crowded or offline. Heat waves can lead to power outages that affect charging availability. Apps like PlugShare or A Better Routeplanner help find real-time charger status and plan accordingly.
Be mindful of regenerative braking
Regenerative braking systems capture energy normally lost during slowing and feed it back to the battery, but high heat can affect how aggressive regen feels. Some cars reduce regen automatically to protect the battery when it’s hot, which can make the vehicle coast farther than usual. Drivers new to EVs should practice in an empty lot or quiet street to get a feel for regen behavior in summer conditions.
EVs and hybrids are well-suited for modern roads even in scorching temperatures, but a bit of planning and awareness goes a long way. By parking smart, charging carefully, maintaining tires and fluids, and adjusting driving habits, owners can keep their vehicles in peak condition all summer long.
The news and editorial staffs of Southern California News Group and The San Diego Union-Tribune had no role in this post’s preparation.