What the weather has actually been at the start of 20 of the world's biggest races over the last ten years, what to wear for it, and the live forecast once race week arrives. Sorted by whichever race is next.
Philadelphia, Pennsylvania · Marathon · about 30,000 runners
Sunday, November 22, 2026· in 17 days
40°F (4°C)
avg start · rain 3/10 yrs
Honolulu, Hawaii · Marathon · about 25,000 runners
Sunday, December 13, 2026· in 38 days
72°F (22°C)
avg start · rain 4/10 yrs
Houston, Texas · Marathon & Half · about 30,000 runners
Sunday, January 17, 2027· in 73 days
42°F (6°C)
avg start · rain 1/10 yrs
Los Angeles, California · Marathon · about 25,000 runners
Sunday, March 21, 2027· in 136 days
49°F (9°C)
avg start · rain 1/10 yrs
New York City, New York · Half marathon · about 25,000 runners
Sunday, March 21, 2027· in 136 days
36°F (2°C)
avg start · rain 2/10 yrs
Charleston, South Carolina · 10K · about 30,000 runners
Saturday, April 3, 2027· in 149 days
59°F (15°C)
avg start · rain 2/10 yrs
Boston, Massachusetts · Marathon · about 30,000 runners
Monday, April 19, 2027· in 165 days
53°F (12°C)
avg start · rain 2/10 yrs
London, United Kingdom · Marathon · about 55,000 runners
Sunday, April 25, 2027· in 171 days
54°F (12°C)
avg start · rain 4/10 yrs
Spokane, Washington · 12K · about 35,000 runners
Sunday, May 2, 2027· in 178 days
54°F (12°C)
avg start · rain 3/10 yrs
Philadelphia, Pennsylvania · 10 miles · about 40,000 runners
Sunday, May 2, 2027· in 178 days
56°F (13°C)
avg start · rain 6/10 yrs
Brooklyn, New York · Half marathon · about 27,000 runners
Saturday, May 15, 2027· in 191 days
58°F (14°C)
avg start · rain 4/10 yrs
San Francisco, California · 12K · about 20,000 runners
Sunday, May 16, 2027· in 192 days
55°F (13°C)
avg start · rain 2/10 yrs
Boulder, Colorado · 10K · about 45,000 runners
Monday, May 31, 2027· in 207 days
49°F (9°C)
avg start · rain 7/10 yrs
Duluth, Minnesota · Marathon & Half · about 20,000 runners
Saturday, June 19, 2027· in 226 days
59°F (15°C)
avg start · rain 5/10 yrs
Atlanta, Georgia · 10K · about 60,000 runners
Sunday, July 4, 2027· in 241 days
72°F (22°C)
avg start · rain 4/10 yrs
Sydney, Australia · 14K · about 80,000 runners
Sunday, August 8, 2027· in 276 days
49°F (9°C)
avg start · rain 3/10 yrs
Berlin, Germany · Marathon · about 50,000 runners
Sunday, September 26, 2027· in 325 days
56°F (13°C)
avg start · rain 2/10 yrs
Chicago, Illinois · Marathon · about 50,000 runners
Sunday, October 10, 2027· in 339 days
52°F (11°C)
avg start · rain 1/10 yrs
Arlington, Virginia · Marathon · about 30,000 runners
Sunday, October 31, 2027· in 360 days
52°F (11°C)
avg start · rain 5/10 yrs
New York City, New York · Marathon · about 55,000 runners
Sunday, November 7, 2027· in 367 days
48°F (9°C)
avg start · rain 3/10 yrs
Weather is for each race's usual date, from the Open-Meteo ERA5 archive, 2016 to 2025. Dates are expected dates; confirm on the official race site.
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