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Hot weather can reduce an electric car’s range because air conditioning and battery thermal management use energy that would otherwise help move the car. In AAA’s 2026 controlled tests, three battery-electric vehicles averaged 8.5% less calculated range at 95°F than at 75°F. That is a result for the tested vehicles and conditions—not a universal prediction. The available evidence does not establish a general percentage of permanent battery degradation caused by hot weather.
How does hot weather affect EV range?
During a hot trip, some battery energy goes to cooling the cabin and managing battery temperature. That leaves less energy available for propulsion over the same drive. AAA’s 2026 laboratory report found lower efficiency and calculated range at 95°F than at its 75°F comparison temperature for the three tested battery-electric vehicles (BEVs). Results varied with vehicle architecture and thermal-control strategy.
In those tests, average MPGe fell by 10.4%, while calculated range fell by 8.5% at 95°F versus 75°F. MPGe measures energy efficiency; calculated range estimates how far the vehicle can travel. They are related but distinct measures. The study used controlled dynamometer tests and a small vehicle sample, so its averages do not account for every model, route, humidity level, sun exposure, or driving style. AAA’s 2026 test summary and report
How much range can an EV lose in hot weather?
There is no single figure that applies to every electric car. AAA’s 2026 study found an average 8.5% calculated-range reduction at 95°F compared with 75°F across three tested BEVs. An earlier AAA test reported an average 17% range reduction at 95°F with air conditioning on across five EVs. These results came from different study designs and samples, so they should not be combined or treated as competing estimates of one universal loss. AAA’s 2019 test
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Does hot weather permanently damage an EV battery?
The test findings establish a short-term efficiency and range effect during hot-weather operation; they do not quantify permanent battery damage. The sources available here do not provide a reliable, general hot-weather degradation percentage over a defined ownership period.
A 2012 National Renewable Energy Laboratory fact sheet says preconditioning while plugged in can improve battery life over the long term, but it does not isolate or measure a heat-caused aging rate. For battery care and temperature-management guidance specific to a vehicle, consult its owner’s manual. NREL fact sheet on climate control and preconditioning
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What can drivers do in hot weather?
- Precondition while plugged in. Use the vehicle’s climate controls before departure so cabin cooling—and, where supported, battery temperature management—can draw power while the car is connected. Follow the owner’s manual for the model-specific procedure.
- Keep tires properly inflated. Check pressure against the vehicle’s recommended figures, rather than relying on a generic target.
- Avoid sustained high speeds in extreme heat when practical. AAA lists this as an efficiency-minded measure; it does not guarantee a particular range recovery.
These steps may help limit avoidable energy use, but they cannot ensure a specific number of additional miles. AAA’s guidance also notes that air conditioning and thermal management can reduce efficiency in high temperatures, with impacts often smaller than in cold weather. AAA hot-weather guidance
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What do the hot-weather cost estimates mean?
AAA’s 2026 report estimated that operation at 95°F raised BEV costs by $6.78 per 1,000 miles under its residential-electricity assumption and $16.25 per 1,000 miles under its commercial-charging assumption. The calculations used electricity prices dated March 27, 2026: $0.1745 per kWh for residential electricity and $0.418 per kWh for commercial charging; the report also used gasoline at $3.978 per gallon. These are study assumptions, not current or individualized prices for every driver. AAA’s 2026 operating-cost calculations
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