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Be prepared for extreme heat and drought

Last updated on March 18, 2025

City scene on a very sunny day, with a thermometer that is showing high temperatures

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What is extreme heat?

Extreme heat is when temperatures are already very hot and daytime and nighttime temperatures get hotter every day and are well above seasonal norms. 

Extreme heat is dangerous for the health and wellbeing of our communities and is responsible for the highest number of weather-related deaths annually.

In 2021, the B.C. Coroners Service attributed 595 deaths to the extreme heat event that occurred between June 25 and July 1. Most of those deaths resulted from excessive indoor temperatures in private residences.

Climate change connection

B.C. is experiencing higher annual summer temperatures and more extremely hot days due to climate change. Western Canada is already on average one to two degrees warmer than it was in the 1940s (source: Canada in a Changing Climate; Government of Canada).

This trend increases the likelihood for extreme heat events like the heat dome experienced in 2021, making it more critical for people to understand the risk, prepare for these conditions, and know where to access support.

Before summer

This section outlines basic readiness steps and heat specific considerations for your emergency plan.

Identify those who are at risk

While everyone can benefit from planning and preparing for extreme heat, the following people are especially at-risk if they do not have access to air conditioning and need to be prepared and supported:

  • seniors aged 65 years or older
  • people who live alone
  • people with pre-existing health conditions such as diabetes, heart disease or respiratory disease
  • people with mental illness such as schizophrenia, depression, or anxiety
  • people with substance use disorders
  • people who are marginally housed
  • people who work in hot
  • environments
  • people who are pregnant
  • infants and young children
  • people with limited mobility

Make plans

If you live alone, and need extra help, pick someone to check in on you when temperatures rise. They could take you to a designated cooling centre or space, or help with cooling measures in your residence.

Can you stay at home?

If you are at risk and you live in a building or residence that gets very hot, with sustained internal temperatures of 31 degrees or higher, plan to go elsewhere during extreme heat.

What are your home’s cool zones?

You should prepare to stay in the coolest part of your residence and focus on keeping that one location cool.

Start by identifying a room that’s typically coolest and consider how you can modify the layout to support sleeping and day-to-day living for the duration of the heat event.

Cooling spaces and centres

Identify places in your community you can visit to get cool, such as:

  • libraries
  • community centres
  • shopping malls
  • movie theaters
  • religious centres
  • parks and other shaded green spaces

In response to extreme heat, First Nations and local governments in affected areas may open emergency cooling centres or general cooling spaces.

Locations may be listed on EmergencyMapBC at the discretion of local governments. If cooling locations are not listed on the map in your area, contact your Band office or local government.

Prepare your home

A few modifications to your home can make a big difference during extreme heat. Pick and choose from the list below based on your needs. Even one or two things can help.

Indoors:

  • Install a window air conditioner in at least one room
  • Install thermal curtains or window coverings
  • Keep easy-to-read thermometers available to accurately measure indoor temperatures (31 degrees or higher is dangerous for vulnerable people)
  • Have fans available to help move cooler air indoors during the late evening and early morning hours
  • Install a heat pump
  • Tip: Fans cannot effectively reduce body temperatures or prevent heat-related illness in people at risk. Do not rely on fans as your primary cooling method during extreme heat. 

Outdoors:

  • Install exterior covers or reflective films that block the sun from hitting the windows. This can be as simple as applying cardboard to the outside of the window
  • Tip: Uncovered windows can increase the internal heat of your home by 2 to 3 degrees.

As temperatures rise

Pay attention to the media, Environment Canada, EmergencyInfoBC and your health authority for more information.

Follow these trusted sources:

Environment Canada

HealthLink BC

BC Centre for Disease Control (BCCDC)

First Nations Health Authority

Regional Health Authorities

EmergencyInfoBC

Health Canada

*X (formerly Twitter) 

Activate your plan to stay cool

During extreme heat, it’s time to put your plan into action:

  • Relocate to a cooler location if you have planned to do so
  • Reconfigure the coolest location in your home so you can sleep there at night
  • Check in with your pre-identified extreme heat buddy. If you don’t have one, reach out to someone you trust
  • Put up external window covers to block the sun if you can safely do so
  • Close your curtains and blinds
  • Ensure digital thermometers have batteries
  • Make ice and prepare jugs of cool water
  • Keep windows closed between 10 a.m. and 8 p.m. Open them at 8 p.m. to allow cooler air in, and use fans (including kitchen and bathroom exhaust fans) to move cooler air through the house
  • Visit an emergency cooling centre or general cooling space. Locations may be listed on EmergencyMapBC at the discretion of local governments. If cooling locations are not listed on the map in your area, visit your Band office or local government.

During extreme heat 

In homes without air conditioning, heat builds indoors over the course of a few days. It may stay hotter inside than outside overnight. Without air conditioning, the longer the heat lasts, the more dangerous it becomes.

Take the following steps to keep yourself and members of your home safe. 

Stay cool inside

  • If you have air conditioning, turn it on. It does not need to be going full strength to help you stay safe
  • If you have air conditioning, and friends and family do not, bring them to your home
  • If you do not have air conditioning, move to your pre-identified alternate location with air conditioning or cooler spaces
  • Sleep in the coolest room of your residence. If it’s cooler outside, sleep outside if safe to do so
  • Sleep with a wet sheet or in a wet shirt
  • Take cool baths or showers to draw heat from your body
  • Drink plenty of water, regardless of whether you feel thirsty. Be aware that sugary or alcoholic drinks cause dehydration
  • If you are taking medication or have a health condition, ask your doctor or pharmacist if it increases your health risk in the heat and follow their recommendation
  • If your doctor limits the amount you drink or has you on water pills, ask how much you should drink when the weather is hot.

Stay cool outside

  • Lower your activity level
  • If you must do errands, do them early or late in the day
  • Never leave children or pets in a parked car
  • Avoid direct sun by staying in the shade and wearing a hat and protective clothing
  • Use sunscreen and UV-protective eyewear
  • Seek cooler, breezier areas when outdoors, such as large parks near to trees and water
  • If you work in a hot environment, discuss and act on ways to decrease heat exposure with your employer and coworkers.

Pets: Make sure you have lots of fresh water for your pets and that they are in cool locations. Stay in shady areas and avoid asphalt and pavement; those surfaces can burn paws.

Getting too hot

Overheating can be harmful to your health and potentially deadly. If you’re experiencing symptoms, such as rapid breathing and heartbeat, extreme thirst, and decreased urination with unusually dark yellow urine, take immediate steps to cool down and seek emergency care.

  • Get medical attention or call 911
  • Submerge yourself or the person you’re helping in cool water
  • Remove clothes and apply wet cloths

Heat stroke is an emergency. Call 911 or your local emergency number if you are caring for someone who displays symptoms, then take immediate action to cool them down while waiting for help to arrive.

Extreme heat and wildfire

Extreme heat can lead to periods of drought and a higher risk of wildfires. For most people, exposure to extreme heat is a bigger risk to health than exposure to wildfire smoke. 

Drought

Drought is a recurring climate event caused by combinations of low snow accumulation, hot and dry weather, or a delay in rainfall. Like extreme heat, climate change is altering the frequency, severity, and duration of droughts. 

Conservation and preparedness

During a drought, impacted communities may experience a water shortage. Your First Nation or local government may restrict the use of water for certain activities. Follow all instructions and restrictions specific to where you live or travel. 

Conserving water is particularly important during drought conditions, but it’s also a good habit to be in at all times. Try to do at least one thing each day to conserve water.

Bottled water is an important part of your emergency kit. Most people need four litres of water per person per day, but some people may need more. When it's time to refresh your kit, don't pour expired water down the drain. Replace it with fresh bottles, and use the expired water for your garden or for washing or cleaning.