The 2026 event has concluded.

Great Welsh Marathon

Carmarthenshire, Wales, UKMarch 8, 2026

Race Day Weather

rain
48°
50° high
Breezy
Light rain likely

Cool temps, light rain expected

Runners will face a consistent temperature of 48°F to 50°F, with high humidity at 96%. Light rain is anticipated throughout the race, necessitating careful footing. With winds from the SE at 8 mph, runners should maintain a steady pace while considering hydration due to the humidity.

partly-cloudy-day9
partly-cloudy-day8
partly-cloudy-day9
rain6
partly-cloudy-day8
partly-cloudy-day9
rain6
partly-cloudy-day9
partly-cloudy-day8
partly-cloudy-day9
partly-cloudy-day9

Pace Calculator

Distance: 26.2mi
0:00:00
HH:MM:SS
Pace
Weather Adj.
Common Goals:

Hosted at the magnificent Pembrey Country Park in Carmarthenshire this race showcases the best of coast and country on a route that covers both the half and full marathon distance.   This is a race for everyone, so whether you love inspiring green spaces or are a sucker for coastal views, then you’ll run happy, as this has it all! Boasting a maximum elevation of only 18 metres and an overall gain of 110 metres for the full marathon distance, this race offers a superb opportunity to achieve your personal best! It’s the perfect spring race that is flat, friendly, and great for first-timers or PB chasers! Source

Area Map

Course Map

FAQ

When is the 2026 Great Welsh Marathon?

The 2026 Great Welsh Marathon will be held on Sunday March 8, 2026.

What will the weather be like for the 2026 Great Welsh Marathon?

The forecast calls for a high of 50°F and a low of 48°F with a 100% chance of rain.

Historical Weather

Based on 6 years of data
Avg Temp
54°F
L:49° H:54°
RunScore
7
Conditions
Rain Freq
33%
2 of 6 yrs
Wind16mph
Dew42°F

Temperature History

Range of temperatures during race hours for each year.

Detailed History

YearConditionsLow / HighRainScore
2025
clear-day
43°/51°-
8
2024
rain
50°/54°Light
6
2022
partly-cloudy-day
51°/60°-
7
2019
cloudy
43°/50°-
6
2018
partly-cloudy-day
50°/54°Light
6
2017
cloudy
54°/57°-
8