In August the only thing most of us want to enteratin is thoughts of winter. But it does not do to become a city of heat hermits. Friendships must be maintained, even under fire.

Movies are dark and cool, and, when featuring a really horrible horror film, chilling as well. They are a good place to take friends, giving each a Thermos of whatever cold drink they favor. Popcorn for a main course? Maybe, or feed everyone a cold supper afterward.

No swimming pool? Ask people to put on their bathing suits and join you after dinner for an evening under the sprinkler. Provide three large beachballs and six different kinds of ice cream.

Or, best of all, take everyone you know ice skating.

Both Fort Dupont Indoor Ice Arena and the Fairfax Ice Skating Arena can handle several hudred of your closest friends. It's 50 to 60 degrees inside, and, they warn, be sure to wear a sweater.

Fairfax Ice Skating Arena, 3779 Pickett Rd., Fairfax, Va., 323-1132. Open to the public Monday, 4 to 5:30 p.m.; Tuesday (adults only) through Thursday, 4 to 5:30 p.m. and 8:15 to 10:15 p.m.; Friday and Saturday, 4 to 5:30 p.m. and 8:15 p.m. to 12:30 a.m. (with a disc jockey); Sunday, 4 to 5:30 p.m. and 8:15 to 10:15 p.m.

Skate rental is 90 cents. Afternoon admission, $2; evening, $2.25 with a membership fee of $1 per family or 50 cents for individuals. Children under 5 are charged 90 cents, which includes skates; on Wednesdays, families, with at least one parent in attendance, are admitted for $6.50.

The rink has a party room which is available free if advance notice is given to Henry Weisiger. He also can arrange for refreshments, or you may bring your own.

Fort Dupont Indoor Ice Arena 37th Street at Ely Place SE, (off Minnesota Avenue.), 581-0550. Wednesday, 12:30 to 2:30 p.m., 3 to 5 p.m., 5:30 to 7:30 p.m.; Thursday, 12:30 to 2:30 p.m., 3 to 5 p.m., 5:30 to 7:30 p.m. and 8 to 10 p.m.; Friday, 5:30 to 7:30 p.m. and 8 to 10 p.m.; Saturday and Sunday, 3 to 5 p.m. (a youth session with special $1 admission for children under 16), 5:30 to 7:30 p.m., and 8 to 10 p.m.; holidays, 12:30 to 2:30 p.m. and 3 to 5 p.m.

Admission, $2; skate rental, 79 cents. (The rink asks for a deiver's license or credit card as security on skate rentals.) Children under 12 must be accompanied by an adult. The entire rink (which can handle 600 skaters) can be booked for $60 an hour, $65 for hockey.

There is a snack bar or you can provide the refreshments. Manager Charles Ford and assistant manager Bob Bell will arrange things, but plan on giving a month's notice. CAPTION: Picture, no caption, By Lucian Perkins - The Washington Post