Race-day weather · Wyndo for runners
San Francisco Marathon weather
July 25, 2027 · San Francisco, CA · scheduled start 5:15 AM (America/Los_Angeles). What the start usually feels like, year by year — and a live start-time read once the race is inside the 7-day forecast window.
Countdown
333 days to race day
The live race-day forecast unlocks 327 days from now, when July 25, 2027 enters the 7-day forecast window — a start-time read for the scheduled 5:15 AM start. Until then, live hourly data is not available; the history below shows what race morning usually looks like.
Typical start temp
58°F
median of 20 years
A warm year
60°F
75th percentile start temp
Rain at the start
0%
0 of 20 measured years
Race-morning weather history
Classic SF marine-layer race: the pre-dawn 5:15 AM start is typically fog/overcast in the 50s F. Exclude 2020 (cancelled); 2021 ran Sep 19, out of slot. Start venue is the Embarcadero only since 2002. Wyndo tracks what this calendar slot has actually served up at the start hour — temperature, dew point, wind, and rain — including the years when weather canceled or disrupted the race, and reads the live forecast for the start once race week arrives.
Median start temp
58°F
p75 (a warm year): 60°F
Median dew point
55°F
at the start hour
Rain at the start
0%
0 of 20 measured years
Warmest start
63°F
in 2014
Scroll sideways to see all columns.
| Year | Start temp | Dew point | Wind | Precip (start hr) | Day's high |
|---|---|---|---|---|---|
| 2026 | 59°F | 56°F | 8 mph | dry | 73°F |
| 2025 | 57°F | 54°F | 7 mph | dry | 69°F |
| 2024 | 57°F | 54°F | 5 mph | dry | 72°F |
| 2023 | 61°F | 56°F | 5 mph | dry | 76°F |
| 2022 | 55°F | 53°F | 8 mph | dry | 73°F |
| 2021 | 56°F | 53°F | 7 mph | dry | 74°F |
| 2020 | 58°F | 55°F | 6 mph | dry | 75°F |
| 2019 | 60°F | 57°F | 3 mph | dry | 81°F |
| 2018 | 60°F | 57°F | 6 mph | dry | 75°F |
| 2017 | 58°F | 57°F | 3 mph | dry | 80°F |
| 2016 | 58°F | 56°F | 4 mph | dry | 79°F |
| 2015 | 60°F | 58°F | 7 mph | dry | 74°F |
| 2014 | 63°F | 60°F | 5 mph | dry | 83°F |
| 2013 | 57°F | 54°F | 7 mph | dry | 70°F |
| 2012 | 56°F | 54°F | 6 mph | dry | 76°F |
| 2011 | 56°F | 54°F | 7 mph | dry | 71°F |
| 2010 | 53°F | 51°F | 8 mph | dry | 67°F |
| 2009 | 54°F | 53°F | 5 mph | dry | 75°F |
| 2008 | 58°F | 55°F | 8 mph | dry | 68°F |
| 2007 | 62°F | 60°F | 4 mph | dry | 74°F |
Slot climatology: each row is the weather at this race's usual calendar slot and start hour (ERA5 reanalysis at the start line) — including years when the edition was canceled or moved. A computed slot date is not a claim the race ran that day.
Your heat-adjusted goal for the marathon
The same cited model as the full calculator, pointed at this race: the median start-hour conditions this calendar slot has served up — climatology, not a forecast.
Your race-day brief
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Race facts
- Start line
- The Embarcadero at Market St, by the Ferry Building (the official page also says "Embarcadero @ Mission" in its corral section, ~150 m apart; coordinates approximate, at Market). Finish: Embarcadero at Howard. Embarcadero start/finish only since 2002.
- Scheduled start
- 5:15 AM (America/Los_Angeles) — Official 2027 full-marathon page: corrals A-D at 5:15/5:20/5:25/5:30 AM PT; 5:15 corral A is the first mass start. No earlier elite/wheelchair gun published (the ultra started before the marathon in past editions; 2027 time unverified). 6-hour limit. Early-cycle page — could change.
- Field size
- Marathon-distance finishers, 2026 edition, per FindMyMarathon (aggregator; not a weekend total).
- Registration
- open (tiered pricing by date; virtual option)
Wyndo is not affiliated with or endorsed by the San Francisco Marathon (officially the "The San Francisco Marathon") or its organizers. Race names are used descriptively to identify the event; schedules and start times belong to the race — always confirm details on the official site. Weather guidance here is informational, never medical advice, and event alert flags on race day belong to the race's own medical team.