Heat wave forces two East Bay school districts to cancel or delay athletic activities through Monday.

In advance of the heat wave expected to roast much of the Bay Area for the next several days, the San Ramon Valley Unified School District on Thursday canceled all athletic activities through Monday.

In a statement, the district cited poor air quality and extreme heat as the reasons to halt “all indoor and outdoor SRVUSD middle and high schools activities, including all home, neutral and away practices and competitions” until after Labor Day.

The sports affected included cross country, tennis, football, water polo, golf and volleyball.

Only one of the district’s four high schools — Dougherty Valley-San Ramon — was scheduled to play Friday (at home against Berkeley). The temperature in San Ramon is forecast to reach 112 degrees Friday.

The Acalanes Union High School District — along the Highway 24 corridor, where temperatures are expected to approach 110 degrees — canceled all indoor and outdoor

sports activities scheduled to begin before 8 p.m. on both Friday and Saturday. Friday home football games for Miramonte-Orinda (against St. Mary’s-Berkeley) and Campolindo-Moraga (against St. Ignatius) and Las Lomas-Walnut Creek’s game at Ygnacio ValleyConcord will still be played, but with kickoffs at 8p.m., an hour later than previously scheduled.

North Coast Section Commissioner Gil Lemmon said he was encouraging all schools in the section — 174 of them from Fremont to Crescent City along the California coast — to use their best judgment.

“What I let them know is that it’s their decision whether the games are played or canceled or whether arrangements should be made to change times,” Lemmon said.

CIF Executive Director Roger Blake said the idea of a too-hot-to-play benchmark has been discussed in the past, but it’s not practical.

“We talked about that with our Sports Medicine Committee a couple years ago,” said Blake. “Say you made it 105 degrees. A couple of them chuckled. They said the kids in Imperial Valley would never play a game.

“The local schools, the leaders, need to make the best decision based on their local conditions. The bottom line is adults to make good adult decisions.”