Race-day weather · Wyndo for runners
Cooper River Bridge Run weather
April 3, 2027 · Mount Pleasant, SC · traditional start around 7:30 AM (America/New_York) — not yet confirmed for 2027. What the start usually feels like, year by year — and a live start-time read once the race confirms its schedule and race week arrives.
Countdown
218 days to race day
The live race-day forecast unlocks 212 days from now, when April 3, 2027 enters the 7-day forecast window. Until then, live hourly data is not available; the history below shows what race morning usually looks like.
The 2027 start time hasn't been published yet — the 7:30 AM start shown here is carried from a previous edition. We'll switch on the live start-time read when the race posts its schedule.
Typical start temp
60°F
median of 8 years
A warm year
66°F
75th percentile start temp
Rain at the start
0%
0 of 8 measured years
Race-morning weather history
Early-April Charleston: mild, humid coastal mornings (~50–68F), spring-shower risk on the exposed Ravenel Bridge span — typical-climate characterization, UNVERIFIED; ERA5 supplies actuals. 2020 CANCELLED (COVID). 2021 held SEPT 25 (out of season) — EXCLUDED from historicalRaceDates (late-summer, not April); slotClimatologyComparable is whole-list, so a lone September date would pollute the spring climatology. Deterministic April dates otherwise, but the Holy-Week shift makes the rule non-nth-weekday. Wyndo tracks what past editions of the race actually served up at the start hour — temperature, dew point, wind, and rain, and reads the live forecast for the start once the race confirms its schedule and race week arrives.
Median start temp
60°F
p75 (a warm year): 66°F
Median dew point
55°F
at the start hour
Rain at the start
0%
0 of 8 measured years
Warmest start
69°F
in 2025
Scroll sideways to see all columns.
| Year | Start temp | Dew point | Wind | Precip (start hr) | Day's high |
|---|---|---|---|---|---|
| 2026 | 62°F | 53°F | 16 mph | dry | 68°F |
| 2025 | 69°F | 67°F | 6 mph | dry | 78°F |
| 2024 | 47°F | 37°F | 11 mph | dry | 63°F |
| 2023 | 69°F | 65°F | 15 mph | dry | 77°F |
| 2022 | 54°F | 48°F | 11 mph | dry | 66°F |
| 2019 | 59°F | 57°F | 4 mph | dry | 70°F |
| 2018 | 66°F | 63°F | 11 mph | dry | 73°F |
| 2017 | 58°F | 50°F | 4 mph | dry | 74°F |
Each row is the weather at a real past edition's date and this race's current start hour (ERA5 reanalysis at the start line).
Your heat-adjusted goal for the 10k
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
Skip the taper-week refresh spiral. Email briefs for the Cooper River Bridge Run: a race-morning outlook when race day enters the 7-day forecast window, updates only when it changes meaningfully, and a final look the day before.
Email me when the Cooper River Bridge Run forecast firms up
The first race-day outlook when your race enters the 7-day forecast window, an update when it changes meaningfully, and a final look the day before.
We'll email you a sign-in code. No password needed.
Race facts
- Start line
- Coleman Boulevard (SC-703) at ~645 Coleman Blvd / Simmons St, Mount Pleasant; geocode of the official start address, approximate. Course crosses the Arthur Ravenel Jr. Bridge and finishes in downtown Charleston (Meeting/George St near Marion Square) — a different point.
- Traditional start (not confirmed for 2027)
- 7:30 AM (America/New_York) — Wheelchair Division ~7:25am; runner corrals close 7:00am; typical mass start ~7:30–8:00am but the 2026 edition was delayed to ~8:10am. Treat as unconfirmed/variable. Point-to-point with a long corral rollout.
- Field size
- FINISHERS, 2025: 'more than 30,000' (Post & Courier; exact count not extractable — results on a JS platform). The widely-quoted ~35,000 ('35K get over it') is entrants/participants, not finishers. Historic capacity ~40,000-44,000.
- Registration
- open (capacity ~40k; sells out)
Wyndo is not affiliated with or endorsed by the Cooper River Bridge Run (officially the "Cooper River Bridge Run") 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.