Boston UK Marathon weather.
Typically 3°C on race morning; rain in 1 of the last 10 years. Race morning (07:00 to 11:00 local time) in Boston on race day in each of the last 10 years; the 2027 race is on 11 Apr 2027.
- Typical
- 3°C (37°F)
- race-morning average
- Coolest
- -2°C (28°F)
- lowest reading, 07:00–11:00
- Warmest
- 12°C (54°F)
- highest reading, 07:00–11:00
- Wet years
- 1 of 10
- rain, drizzle or worse
- Humidity
- 74%
- typical
- Wind
- 11 km/h
- typical, at 10 m
Race morning, 07:00–11:00
Year by year
| Race day | Average | Low–high | Humidity | Wind | Rain | Conditions |
|---|---|---|---|---|---|---|
| 12 Apr 2026 | 4°C (38°F) | 2°C (36°F)–5°C (40°F) | 60% | 10 km/h | 0.0 mm | Clear |
| 13 Apr 2025 | 3°C (38°F) | 3°C (37°F)–3°C (38°F) | 88% | 18 km/h | 0.6 mm | Light drizzle |
| 14 Apr 2024 | 7°C (44°F) | 6°C (42°F)–7°C (45°F) | 74% | 16 km/h | 0.0 mm | Overcast |
| 9 Apr 2023 | 0°C (32°F) | -1°C (31°F)–1°C (34°F) | 74% | 7 km/h | 0.0 mm | Clear |
| 10 Apr 2022 | 3°C (38°F) | 3°C (37°F)–4°C (38°F) | 89% | 12 km/h | 0.0 mm | Overcast |
| 11 Apr 2021 | 11°C (52°F) | 9°C (48°F)–12°C (54°F) | 96% | 11 km/h | 0.0 mm | Overcast |
| 12 Apr 2020 | 0°C (33°F) | 0°C (32°F)–1°C (34°F) | 67% | 9 km/h | 0.0 mm | Clear |
| 14 Apr 2019 | 10°C (51°F) | 10°C (49°F)–12°C (53°F) | 92% | 6 km/h | 0.0 mm | Overcast |
| 8 Apr 2018 | -1°C (30°F) | -2°C (29°F)–-1°C (31°F) | 57% | 11 km/h | 0.0 mm | Overcast |
| 9 Apr 2017 | 1°C (35°F) | 1°C (33°F)–2°C (36°F) | 72% | 12 km/h | 0.0 mm | Clear |
Each row is the race's date that year where we know it, else the same weekday nearest its usual date. Temperatures and humidity are averaged over 07:00 to 11:00 local time, rain is the total over those hours, and conditions are the commonest over the morning. The marathon starts at 08:00.
Kit and pacing
What it means
Dress for the cold start
Mornings are usually around 3°C. Gloves, a hat and an old top you can throw away at the start are worth packing, and warm up for longer than usual: cold muscles take a few kilometers to get going.
The weather varies a lot
Race mornings here have ranged by 12°C from year to year. Pack for both, and settle your kit and pacing from the forecast in the last few days.
General guidance from past years' numbers. Check the forecast in race week.
Weather data by Open-Meteo.com, from its historical weather archive (CC BY 4.0).