MLB Weather Report — September 21, 2026

Monday brings a light three-game slate. Baltimore is the only location with a meaningful rain concern, with shower chances increasing during the game. Detroit will be dry but breezy, while San Francisco will be cool, humid and mostly cloudy.

TORONTO BLUE JAYS @ BALTIMORE ORIOLES

Temperatures will be near 70 degrees at first pitch before falling into the mid-60s. Humidity should begin around 70% and climb above 80% later in the game.

The rain probability is approximately 30% around first pitch, increasing toward 50% by 8 p.m. and 65% to 70% late. Northeast winds of 8–9 mph will be blowing IN from center field. A later-game delay is possible if the approaching showers arrive on schedule.

WASHINGTON NATIONALS @ DETROIT TIGERS

Expect temperatures around 61–62 degrees at first pitch, falling into the upper 50s. Humidity will range from approximately 70% to 80%, with virtually no precipitation expected.

Northeast winds of 11–13 mph will be blowing OUT toward right field, with occasional gusts around 20–22 mph.

MINNESOTA TWINS @ SAN FRANCISCO GIANTS

Temperatures will remain around 60–62 degrees throughout the game, with humidity near 90% to 95%. The precipitation probability is approximately 2%, so rain should not be a concern.

West-southwest winds near 9 mph will be blowing OUT toward center and right-center field. Gusts could reach approximately 18 mph early in the evening.

BOTTOM LINE

Baltimore requires the closest monitoring because shower chances increase as the game progresses. Detroit should remain completely dry, but northeast winds will be noticeable and could gust above 20 mph. San Francisco will be cool and very humid, with a steady breeze blowing out and little threat of rain.