Coastal roads from Crescent Beach to Portland Head Light. Ocean air keeps August cooler than inland, but humidity and sea fog are common.
Plan for about 73°F (23°C) at the 08:00 start, feeling like 77°F (25°C), with 80% humidity and 5 mph wind, warming to roughly 75°F (24°C) by the finish. It rained on 3 of the last 10 race days. Wear: Singlet or Tank, Running Shorts, Running Cap, Waterproof Jacket, Sunscreen.
Feels like 77°F (25°C) at the start · finish 75°F (24°C) · rain 3 of 10 · start air from 68°F (20°C) to 77°F (25°C)
Conditions at the 08:00 start on the race's usual date each year (first Saturday of August). Years when the race was cancelled or moved still show that date's weather. Source: Open-Meteo ERA5 archive.
Bar: air temperature from start to finish · dot: feels-like effective temperature · ≫ windy (15+ mph) · rain · shaded: PR band 40–50°F
| Year | Start temp | Feels like | Finish | Humidity | Wind | Rain | Sky |
|---|---|---|---|---|---|---|---|
| 2025 | 68°F (20°C) | 67°F | 72°F | 56% | 5 mph | – | Clear |
| 2024 | 74°F (23°C) | 81°F | 74°F | 95% | 4 mph | 0.53 in | Drizzle |
| 2023 | 69°F (21°C) | 72°F | 72°F | 82% | 5 mph | – | Overcast |
| 2022 | 75°F (24°C) | 82°F | 76°F | 95% | 5 mph | – | Mostly clear |
| 2021 | 74°F (23°C) | 79°F | 77°F | 78% | 3 mph | – | Overcast |
| 2020 | 77°F (25°C) | 79°F | 79°F | 61% | 4 mph | – | Clear |
| 2019 | 74°F (23°C) | 77°F | 77°F | 70% | 3 mph | – | Overcast |
| 2018 | 75°F (24°C) | 83°F | 77°F | 97% | 5 mph | 0.37 in | Drizzle |
| 2017 | 68°F (20°C) | 70°F | 68°F | 93% | 9 mph | 0.19 in | Overcast |
| 2016 | 74°F (23°C) | 77°F | 76°F | 74% | 8 mph | – | Drizzle |
Coldest start: 68°F (20°C) in 2025. Warmest: 77°F (25°C) in 2020. Wettest: 0.53 in in 2024.
The time estimates apply published temperature–performance curves to this race's ten-year weather history. Performance peaks at an effective race temperature of roughly 40 to 50°F and degrades faster the warmer it gets and the slower you run (Ely et al., 2007; El Helou et al., 2012). Wind adds a cost that grows with the square of the wind speed (Pugh, 1971), split into head and tail components on point-to-point courses. Shorter races are penalised less. This is a model, not a prediction; your training and the course matter more.
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Built from the 10-year average start conditions by the same engine as the live tool. Treat optional items as corral-only layers you can shed.
Singlet or Tank
Maximum breathability for hot conditions
Waterproof Jacket
Breathable rain protection
Running Shorts
Lightweight with built-in brief
Running Cap
Keep rain out of eyes
Sunglasses
UV protection
Sunscreen
SPF 30+ water-resistant
Trail or Waterproof Shoes
Better grip and water resistance
✓ Worn by the author
Engineered-mesh race top with a gel pocket that does not bounce
$98
✓ Worn by the author
Packable, washable running cap with a short brim
$55
Minimal, lightweight shorts for hot-weather miles
$30
Hands-free hydration for long runs in the heat
$85
✓ Worn by the author
Thin, ribbed quarter sock that keeps grit out
$36
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Over 2016 to 2025 the start averaged 73°F (23°C) (feels like 77°F (25°C)) with 80% humidity and 5 mph wind, warming to about 75°F (24°C) by the finish. It rained measurably on 3 of those 10 race days. The coldest start was 68°F (20°C) in 2025; the warmest was 77°F (25°C) in 2020.
For a typical 73°F (23°C) start: Singlet or Tank, Running Shorts, Running Cap, Waterproof Jacket, Sunscreen. Dress for about 15°F warmer than the start temperature, since the race itself adds that much, and plan to shed anything you only need in the corral.
The TD Beach to Beacon 10K is usually held on first Saturday of August. The next expected date is Saturday, August 7, 2027. Confirm on the official site, since dates occasionally move.
The live forecast on this page comes from Open-Meteo and unlocks 16 days before the race. Forecasts inside 7 days are reliable for temperature within a few degrees; rain timing firms up in the last 2 to 3 days. Until then, the 10-year history above is the best planning guide.
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