With temperatures tipped to nudge record highs again, folks are encouraged to remain indoors and keep their fluids up on Tuesday.

The National Weather Service was predicting a high for Suffolk of 98 degrees, with heat index values as high as 105.

According to James Foster, a meteorologist with the service in Wakefield, the area’s record high for June 23 was set in 1988, when the mercury reached 99 degrees in Norfolk.

“It’s going to be right at the record,” he said.

An area of upper-level high pressure is responsible for the heat, Foster said — as well as the fact we’re in summer.

The temperatures spike when there’s a southerly airflow below the upper-level system, he said.

Temperatures will peak in the middle part of the afternoon, according to Foster, with a 40-percent chance of thunderstorms later in the day.

By Wednesday, the service predicts, the wind will have swung around to the north, lowering the temperature to a predicted high of 90.

Highs of up to 92 are forecast through the remainder of the week. The weekend should be more comfortable, with predicted highs of 88 on Saturday and 87 on Sunday.

Foster recommended folks on Thursday avoid going outdoors and to drink plenty of fluids.

Anyone who has to work outside, he said, should escape to air-conditioned places for regular breaks.

He also warned against leaving children or pets in hot cars.

Authorities recommend the following precautions:

Check elderly family members and neighbors to ensure they have a cool place to go if they don’t have air conditioning.

Fans by themselves are not enough to prevent heat-related illnesses in extreme conditions. Cold baths or showers can help. Drink cool, non-alcoholic beverages — and more of them, regardless of activity level. Two to four glasses an hour are recommended. Drink fruit juice or a sports beverage when exercising or working outside.

Talk to your doctor if you’re on a fluid-restricted diet or medications, or on a low-salt diet.

Never leave children or pets in cars, where temperatures can reach more than 150 degrees quickly, causing heat stroke and death.

Wherever possible, keep cool in an air-conditioned area — consider a trip to the mall or library, or visit a friend with air conditioning. (At least two hours per day in air conditioning significantly lowers the risk of heat-related illnesses.)

Avoid sunburn and wear light clothing. Sunburn limits the body’s ability to keep itself cool and causes loss of body fluids. Use sunscreen with a higher SPF. Lightweight clothing that is loose fitting and light colored is more comfortable during extreme temperatures. Use a hat to keep the head cool.

Give your body a break — the heat wave can be stressful on your body. Limit physical activity until your body adjusts to the heat.

When working outside, use the “buddy system” — ensure someone else knows your plans, in case of confusion or loss of consciousness.