Race-day weather · Wyndo for runners
California International Marathon weather
December 6, 2026 · Folsom, CA · scheduled start 7:00 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
137 days to race day
The live race-day forecast unlocks 131 days from now, when December 6, 2026 enters the 7-day forecast window — a start-time read for the scheduled 7:00 AM start. Until then, live hourly data is not available; the history below shows what race morning usually looks like.
Typical start temp
42°F
median of 20 years
A warm year
50°F
75th percentile start temp
Rain at the start
20%
4 of 20 measured years
Race-morning weather history
Canonical bad year: 2012 atmospheric-river storm with driving rain and 30+ mph headwinds; normal years are cold (mid-30s F) and calm — the source of its PR reputation. 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
42°F
p75 (a warm year): 50°F
Median dew point
38°F
at the start hour
Rain at the start
20%
4 of 20 measured years
Warmest start
60°F
in 2012
Scroll sideways to see all columns.
| Year | Start temp | Dew point | Wind | Precip (start hr) | Day's high |
|---|---|---|---|---|---|
| 2025 | 40°F | 40°F | 2 mph | dry | 50°F |
| 2024 | 41°F | 37°F | 3 mph | dry | 61°F |
| 2023 | 54°F | 50°F | 6 mph | dry | 65°F |
| 2022 | 48°F | 46°F | 7 mph | 1.6 mm | 58°F |
| 2021 | 45°F | 41°F | 2 mph | dry | 62°F |
| 2020 | 40°F | 30°F | 4 mph | dry | 64°F |
| 2019 | 54°F | 48°F | 16 mph | 0.7 mm | 56°F |
| 2018 | 37°F | 34°F | 3 mph | dry | 55°F |
| 2017 | 45°F | 42°F | 4 mph | dry | 57°F |
| 2016 | 38°F | 34°F | 4 mph | dry | 59°F |
| 2015 | 53°F | 43°F | 7 mph | 0.5 mm | 61°F |
| 2014 | 50°F | 46°F | 3 mph | dry | 64°F |
| 2013 | 37°F | 32°F | 3 mph | dry | 65°F |
| 2012 | 60°F | 56°F | 23 mph | 2.1 mm | 62°F |
| 2011 | 34°F | 18°F | 4 mph | dry | 57°F |
| 2010 | 53°F | 47°F | 4 mph | dry | 64°F |
| 2009 | 31°F | 20°F | 8 mph | dry | 51°F |
| 2008 | 35°F | 35°F | 3 mph | dry | 52°F |
| 2007 | 43°F | 19°F | 8 mph | dry | 60°F |
| 2006 | 35°F | 26°F | 4 mph | dry | 63°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.
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Race facts
- Start line
- Folsom-Auburn Rd at Folsom Dam (official start-line map pin 38.70625, -121.17051)
- Scheduled start
- 7:00 AM (America/Los_Angeles) — Starts promptly 7:00 AM, start line closes 7:30 sharp; seven staging corrals by predicted finish; point-to-point, official bus transport required to the start.
- Field size
- 2025 marathon finishers 8,168
- Registration
- open (tiered pricing, sells out well in advance)
Wyndo is not affiliated with or endorsed by the California International Marathon (officially the "California International 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.