MLB Weather Report for Sunday 6/21/26

Sunday’s 15-game slate features one significant weather threat and a handful of situations worth monitoring. Chicago is the primary concern, where thunderstorms are expected to arrive during the Blue Jays-Cubs game with precipitation probabilities exceeding 90% by mid-afternoon. Kansas City carries elevated early-game risk with storms likely around first pitch before conditions improve. Atlanta’s typical summer pattern brings increasing chances of thunderstorms through the late innings. The remainder of the slate is largely clean, with dome and retractable-roof parks removing any weather concern from several matchups. Temperature extremes range from the low 60s in Chicago to 105 in Phoenix.

Highest Delay Risk Games

Toronto Blue Jays at Chicago Cubs – 2:20 p.m. ET

Delay Risk: HIGH

The most dangerous weather situation on the slate. Precipitation probabilities climb from 35% at first pitch to 75% by the third inning and approach 95% by the fifth inning. Thunderstorms, not just rain, are expected. A lengthy delay or suspension is likely if this game begins on time. Temperatures will fall into the low 60s with east winds at 10-15 mph adding to uncomfortable conditions.

St. Louis Cardinals at Kansas City Royals – 2:10 p.m. ET

Delay Risk: MODERATE-HIGH

Showers and thunderstorms are likely around first pitch, with a 57-59% chance of precipitation through the first two hours. The saving grace is a clearing trend; chances fall to 27% by the fourth inning. A pre-game or early-game delay is possible before conditions stabilize.

Milwaukee Brewers at Atlanta Braves – 1:35 p.m. ET

Delay Risk: LOW-MODERATE

The classic summer afternoon pattern in Atlanta. Skies are mostly sunny at first pitch with just a 7% chance, but thunderstorm probabilities build to 30% by 5 p.m. ET. Late-game interruptions are possible but not expected.

Safest Weather Games

Baltimore Orioles at Los Angeles Dodgers – 4:10 p.m. ET

Sunny skies, 72 degrees, light southwest winds at 10 mph, and 0% precipitation throughout. Textbook Southern California conditions with no weather concerns whatsoever.

Boston Red Sox at Seattle Mariners – 4:10 p.m. ET

T-Mobile Park’s retractable roof eliminates any risk, but conditions are ideal regardless: sunny, mid-70s, light northwest winds, and 0% precipitation. A perfect summer evening in the Pacific Northwest.

San Diego Padres at Texas Rangers – 2:35 p.m. ET

Globe Life Field’s retractable roof makes this a non-factor regardless of outdoor conditions, which happen to be 92 degrees and sunny.

At-a-Glance Weather Table

Key DFS & Betting Weather Spots

Toronto Blue Jays at Chicago Cubs

• The most likely delay or postponement on the board. DFS players should exercise extreme caution with exposure to this game, as a suspension or postponement would lock lineups without full scoring potential.
• If play occurs during the early innings, the cold, damp conditions and east winds blowing in off Lake Michigan suppress fly-ball power significantly. This is a low-scoring environment.
• Pivot away from Cubs and Blue Jays stacks unless comfortable absorbing the delay risk.

St. Louis Cardinals at Kansas City Royals

• Early-game delay is probable, but the clearing trend makes a full postponement unlikely. Monitor pregame reports closely for any pushed start time.
• Once storms pass, the moderate WSW winds at 10-12 mph create a relatively neutral environment at Kauffman Stadium.
• Weather-sensitive DFS players may find value in pivot spots if public ownership tilts away from this game.

Milwaukee Brewers at Atlanta Braves

• First pitch conditions are favorable for offense: mid-80s, light winds, and summer humidity at Truist Park. The park plays fair in these conditions.
• Late-game storm risk means closers and late-inning relievers carry marginally higher variance. This is unlikely to affect game completion but could create brief interruptions.

Cincinnati Reds at New York Yankees

• Mostly sunny at first pitch, but a 22% chance of afternoon showers between 2-4 p.m. ET introduces mild uncertainty. The SW winds at 7-8 mph blow out toward right field at Yankee Stadium, providing a subtle boost to left-handed power.
• Not enough precipitation risk to warrant lineup pivots, but worth monitoring if forecasts shift.

Pittsburgh Pirates at Colorado Rockies

• Coors Field in the upper 80s to low 90s with NNW winds at 10-13 mph. The wind direction blows from center toward home plate, which limits carry on fly balls to straightaway center but creates cross-wind effects down the lines.
• The altitude advantage remains intact despite the wind pattern. This is still a favorable hitting environment.
• Minimal precipitation risk (peaking at 16%) should not disrupt play.

New York Mets at Philadelphia Phillies

• The evening start eliminates any afternoon storm concern. Temperatures in the low 80s with west winds at 15 mph at first pitch create a notable wind environment at Citizens Bank Park. Winds blow from left field toward right field, favoring right-handed pull hitters.
• Dry conditions throughout (0-2% precipitation) make this one of the safest evening plays on the board.
• The strong crosswind combined with warm temperatures creates one of the better hitting environments on the slate.

San Francisco Giants at Miami Marlins

• loanDepot Park’s retractable roof provides protection, but it is worth noting that afternoon thunderstorm chances reach 37% outdoors. Roof status should be confirmed, though it will almost certainly be closed given the forecast.
• If the roof is closed, conditions are climate-controlled and carry no weather impact. Evaluate this matchup purely on pitching and lineup merits.

More MLB Content & Betting Picks

• Cincinnati Reds at New York Yankees prediction, pick for Sunday 6/21/26
• MLB Best Bets: Top player prop bets for Sunday 6/21/26
• DraftKings MLB Pick6 Picks Today: Best Fantasy Plays and Projections for Sunday 6/21/26

Tail all of today’s MLB action in the DKN Betting Group here.