2027 Guernsey Marathon - Apr 18

2027 Guernsey Marathon - Apr 18 Countdown

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Race Information

Race2027 Guernsey Marathon - Apr 18
CitySt Peter Port
Date2027-04-18 at 09:00
Time Limit6 hours
Cutoff pace8:32/km
TimezoneEurope/Guernsey
Official SiteGuernsey Marathon

Race Day Weather

Average Temperature10.4°C / 51°F
Humidity86%
Wind27 km/h
Rain Chance24%
Typical ConditionsCool, breezy Atlantic-coast spring morning with about a 25% chance of rain

What to Prepare: A 9:00am April start on the Guernsey coast is cool (around 10°C / 50°F) with a steady westerly sea breeze near 24 km/h. Dress for low double-digits in light layers, expect damp air at ~80% humidity, and pack a thin waterproof in case a shower blows through.

Based on historical averages for race week. Use our Weather Score Calculator and What to Wear Guide for personalized advice.

Wind Impact on Race Day

Wind at 27 km/h can affect your marathon pace by 5-15 seconds per kilometer. Headwinds slow you down exponentially — a 20 km/h wind costs more than twice a 10 km/h wind.

Calculate your wind-adjusted pace →

Race-Week Climate

Based on 20 years of race-week weather (2005-2024), MERRA-2 reanalysis

Cooler Typical Warmer
Temperature 8.8°C 10.4°C 11.7°C
Dew point 4.9°C 8.2°C 10°C
Wet-day chance: 24% Runnability: 69/100

Data: NASA POWER (MERRA-2 reanalysis), NASA Langley Research Center

Course Profile

Course TypeLoop (island circuit)
Elevation Gain300m
TerrainRoad (country lanes and coastal roads)
ProfileA scenic clockwise loop around the whole island. The first half-mile out of St Peter Port climbs the steep Val des Terres (roughly +70m over 800m), then settles into fairly flat country lanes and rolling coastal road for about +300m of total climbing. Open entry, no qualifying time, 6-hour limit.

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Frequently Asked Questions

How do you enter the Guernsey Marathon?

Entry is open and first-come through Race Nation — there is no lottery or qualifying time. Register at the official site while places last; the 2026 edition charged about £75.90 for an unaffiliated full-marathon entry (the 2027 price is set closer to race day). You can run the 26.2 miles solo or split it as a relay team of 2 or 5.

How hilly is the Guernsey Marathon course?

The hard part comes first: the opening half-mile climbs the Val des Terres out of St Peter Port, gaining roughly 70m in under 800m. After that the clockwise island loop is mostly fairly flat country lanes with a few coastal rollers, for about +300m of total ascent over the full 26.2 miles. It is a genuine 42.195km marathon, not a profile to chase a personal best on, but the early climb is the only severe section.

Where does the Guernsey Marathon start and finish?

The race starts and finishes at the South Esplanade in St Peter Port, at the foot of Val des Terres, which also hosts the Marathon Village. The course runs clockwise around the entire island, threading quiet country lanes, valleys and the coastline before returning to the harbour-front finish.

What is the time limit for the Guernsey Marathon?

The cut-off is 6 hours from the 9:00am start. That works out to about a 13:45 per mile average pace, comfortable for most runners who can finish a marathon, but be mindful that the day starts with the Val des Terres climb so bank a little patience early.

What should I wear for the Guernsey Marathon weather?

Dress for a cool, breezy coast. Mid-April mornings average around 10°C / 50°F with a westerly sea wind near 24 km/h and roughly a 25% chance of rain. A short-sleeve top with arm sleeves or a light long-sleeve works well; many runners carry a packable waterproof for exposed coastal stretches where the wind bites.

How big is the Guernsey Marathon field?

It is a small, friendly island race, though it has been growing fast: the 2026 edition set a record with 310 solo full-marathon finishers — the most ever — alongside 55+ relay pairs and 110 teams of five sharing the same 26.2-mile course. Even at that size the roads stay uncrowded and the atmosphere is community-driven rather than big-city throng.

Does the Guernsey Marathon count as a Boston qualifier?

No. The course is measured and run under UK Athletics rules, but there is no evidence it carries the AIMS/USATF-style certification the Boston Athletic Association accepts for qualifying times. Treat Guernsey as a scenic destination marathon rather than a BQ attempt; if Boston is the goal, choose a certified flat course.

Where are the aid stations on the course?

There are eight aid stations around the loop. They offer water and chocolate throughout, with isotonic drinks, jelly babies and bananas added from station 3 onward for marathon runners. With roads only partially closed, run defensively and follow marshal instructions on open sections.

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