The National Weather Service expects temperatures to reach the mid-90s or higher on Tuesday afternoon. The high temps, which could break records, are expected to last through Wednesday.
According to federal records, Boston hit 95 on Sept. 8, 1872 and 91 on Sept. 9, 1971.
Mayor Marty Walsh issued a heat advisory on Monday.
"As this summer comes to a close, we are expecting rising temperatures over the next couple of days," Walsh said in the advisory. "As we work to monitor the rising temperatures, to keep all of our residents and visitors safe, we ask the public to continue being vigilant - look after a neighbor, be it someone outdoors, or someone next door."
A list of the city's heat safety tips include:
- The elderly, young children and those with chronic medical conditions are more susceptible to the effects of heat.
- Always check in on family or neighbors who may be at risk of heat exhaustion or heat stroke as temperatures climb.
- Children and pets should never be left alone in vehicles, even for short periods of times.
- If you become lightheaded, confused, weak or faint, stop all activity and immediately find shade or a cool area to rest. If symptoms persist, call 911 immediately.
- Limit outdoor activity to morning and evening hours. Rest often in shady areas and be extra cautious from 11 a.m. to 3 p.m., when the sun's UV radiation is strongest.
- Drink plenty of fluids regardless of activity level. Avoid alcoholic beverages and liquids high in sugar or caffeine.
If temperatures hit 90 degrees or higher for three straight days, the mayor may declare a heat emergency and open cooling centers around the city.
Jamaica Plain has two locations that have generally been used as cooling centers: The Hennigan and Curtis Hall Community Centers at 200 Heath St. and 20 South St. respectively.
For more tips, please visit the city's heat safety page.