The first weekend of August is likely to be uncomfortably hot for travelers in the D.C. area. The Capital Weather Gang says we should expect high temperatures in the 90s and stifling humidity. There’s a chance of thunder showers on Saturday and Sunday.

There are plenty of places to be for outdoor activities, and a few places to avoid, or at least to prepare for. Here are some highlights of both.

Nationals baseball

Philadelphia Phillies left fielder John Mayberry Jr. (15) is tagged out at home plate by Washington Nationals catcher Sandy Leon (41) on a single hit by Philadelphia Phillies third baseman Michael Martinez (7) during the second inning at Nationals Park on Aug. 2, 2012 in Washington, D.C. (Ricky Carioti/The Washington Post)

Some fans driving to the game may get a break thanks to the opening this week of the new ramp from southbound D.C. 295 to the 11th Street Bridge, which leads to the Southeast-Southwest Freeway and M Street SE. That should save some travel time.

Soccer at RFK

D.C. United plays the Columbus Crew at 7:30 p.m. Saturday in RFK Stadium. Stadium Armory on the Blue and Orange lines is the nearest Metrorail station. (Note the Metro schedules below.)

Final weekend of tennis

The Citi Open tennis tournament, formerly known as the Legg Mason Tennis Classic, continues through Sunday at the FitzGerald Tennis Stadium, 16th and Kennedy streets NW. Tournament time always brings increased traffic congestion on upper 16th Street by Rock Creek Park, and parking restrictions are imposed on streets in the neighborhood.

The tournament runs free shuttles from off-site parking areas to avoid that congestion. There’s a shuttle between the Van Ness Metro station and the tennis stadium, and free parking in the Van Ness Center garage, at Veazey Place NW and Connecticut Avenue. (Show your tennis ticket.)

That shuttle starts 90 minutes before the matches on Friday and two hours before matches on Saturday and Sunday.

Fans can also get to the stadium via the S2 and S4 buses from downtown Silver Spring, where the Montgomery County parking garages by the Metro station are free on weekends.

Check below to see the weekend maintenance disruptions on Metrorail.

Use this link to view the tournament’s parking map.

Annapolis Crab Feast on Friday

Watch for extra traffic along Rowe Boulevard in Annapolis on Friday evening, the date of the Rotary Club’s annual Crab Feast. It’s from 5 to 8 p.m. at the Navy-Marine Corps Memorial Stadium. Check for other local events in The Post’s Going Out Guide.

Second Manassas reenactment

Later this month, on the 150th anniversary of the second battle at Manassas, there will be many events for Civil War buffs on that battlefield, but this weekend, Friday through Sunday, reenactments of the Manassas battle are scheduled to take place on the grounds of the Cedar Creek battle. That’s on Route 11 just south of Middletown, Va., near the I-66/I-81 interchange. Use this link for more information: The phone number for information is 540-869-2064.

Redskins fan day

Redskins Fan Appreciation Day starts at 10:15 a.m. Saturday at Redskins Park, 21300 Redskins Park Dr., Ashburn. It’s north of Dulles International Airport, off the Loudoun County Parkway, about a 45 minute drive from D.C.

Beltway/Telegraph Road

It’s a big weekend for paving and other work along the Capital Beltway’s outer loop and at the Telegraph Road interchange, part of the Wilson Bridge project.

Avoid that area if you can this weekend, but if work goes according to plan and there are no more weather delays, then on Monday, all the outer loop lanes should be open through Telegraph Road to the bridge.

Metro weekend delay

The maintenance schedule will disrupt service on the Red and Orange lines from 10 p.m. Friday through Metrorail’s midnight closing Sunday.

Red Line: Buses will replace trains between Fort Totten and Union Station while crews work on tie and insulator renewal and install fiber optic cable. Other crews with the District Department of Transportation will be working on the New York Avenue Bridge over the tracks north of Union Station.

Between Glenmont and Fort Totten and between Union Station and Shady Grove, trains are scheduled to operate every 10 minutes during daytime hours and at regular weekend intervals at other times, Metro said.

The buses will carry passengers between Fort Totten and Union Station. Brookland, Rhode Island Avenue, and NoMa-Gallaudet U (formerly New York Avenue) will be closed.

Express buses will serve Fort Totten and Union Station only. A ride on the express will add about 20 minutes to normal travel time between the stations, Metro estimated.

Local buses will stop at all stations between Fort Totten and Union Station. Taking a local all the way would add about half an hour to normal travel time.

A rider could use the Green Line between Fort Totten and downtown stations to avoid the bus trip.

Orange Line: Buses will replace trains between the end of the line at Vienna and East Falls Church. Crews on the Silver Line project will be testing in the area where the new line will link with the Orange Line. Metro crews will be working on rail ties and insulators along the Orange Line.

Trains will operate between East Falls Church and New Carrollton on their regular weekend schedule, Metro said.

Buses will replace the trains between Vienna and East Falls Church. Vienna, Dunn Loring and West Falls Church will be closed.

Express shuttle buses will operate between Vienna and East Falls Church. Using those buses probably will add 15 minutes to normal travel times. Local shuttles will stop at all stations along the way. A trip all the way on one of those will add about 40 minutes to normal travel time.

Riders who normally would park at one of the closed stations might want to drive in to East Falls Church station, which has more than 400 parking spaces.

New York Avenue Bridge

The District of Department of Transportation plans to close New York Avenue NE between Penn Street and Florida Avenue between 1 a.m. and 5 p.m. Saturday. This is for the lengthy rehabilitation project on the bridge over the railroad tracks north of Union Station. (Red Line riders can a view of the work as they travel between the NoMa-Gallaudet and Rhode Island Avenue stations.)

Traffic will be detoured around the closing, but it would be better to avoid the congestion in that area.

Avoid Baltimore Harbor Tunnel

The MD Transportation Authority is reminding drivers to avoid the Baltimore Harbor Tunnel and big delays on I-895 this summer during a repair project.

If your travels normally take you up and down I-95 through the Fort McHenry Tunnel, you’re fine. Drivers also can use the Francis Scott Key Bridge on I-695.

BW Parkway

From 7:30 p.m. to 5:30 a.m. Sunday through Tuesday nights, the ramp from the southbound Baltimore Washington Parkway to Route 202 is scheduled to close for milling and paving, the National Park Service said. Vehicles will follow a detour.