racecast.ioPartly cloudy throughout the day.
Light Rain
25%
Wind
14mph
Wind
14mph
Details
Wind
14mph
Wind
14mph
Wind
14mph
Wind
14mph
Wind
14mph
Wind
14mph
Wind
14mph
Wind
14mph
Wind
13mph
Pre-Race
Race
Post-Race
350 lumens of light to illuminate the trail ahead. Black Diamond Spot 350 Headlamp.
When you buy through our links, we may earn a commission.
Wanna to know when the weather changes? .
Race Overview
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!
WikipediaFAQ
When is the 2027 Great Welsh Marathon?
The 2027 Great Welsh Marathon will be held on Sunday October 17, 2027.
Great Welsh Marathon Weather History
Great Welsh Marathon Weather Averages
Average Temp: 49°, Average Low: 44°, Average High: 54°
| Time | 9AM | 10AM | 11AM | 12PM | 1PM | 2PM | 3PM | 4PM |
|---|---|---|---|---|---|---|---|---|
| Temp | 48° | 49° | 50° | 52° | 52° | 52° | 52° | 53° |
| Feel | 44° | 46° | 47° | 50° | 50° | 50° | 51° | 52° |
| Rain | - | - | - | - | - | - | - | - |
| Wind | 11mph | 12mph | 12mph | 14mph | 15mph | 14mph | 14mph | 14mph |
| Dew | 42° | 42° | 42° | 43° | 43° | 43° | 43° | 43° |
| RunScore |  | | | |  | | | |
Great Welsh Marathon 2026
Mar 8, 2026
Partly cloudy throughout the day with rain in the morning and afternoon.
Low: 48°, High: 50°, Light Rain
| Time | 8AM | 9AM | 10AM | 11AM | 12PM | 1PM | 2PM | 3PM |
|---|---|---|---|---|---|---|---|---|
| Temp | 48° | 48° |  48° | 49° | 49° | 49° | 50° | 50° |
| Feel | 47° | 46° | 45° | 45° | 45° | 45° | 47° | 46° |
| Rain | - | - | light | - | - | light | - | - |
| Wind | 3mph | 6mph | 8mph | 8mph | 7mph | 8mph | 7mph | 8mph |
| Dew | 47° | 47° | 48° | 48° | 48° | 48° | 48° | 48° |
| RunScore |  |  | | | | | | |
Great Welsh Marathon 2025
Mar 16, 2025
Becoming cloudy in the afternoon.
Low: 29°, High: 51°
| Time | 8AM | 9AM | 10AM | 11AM | 12PM | 1PM | 2PM | 3PM |
|---|---|---|---|---|---|---|---|---|
| Temp |  38° | 43° | 45° | 48° |  50° | 49° | 50° | 50° |
| Feel | 32° | 38° | 40° | 43° | 44° | 44° | 46° | 50° |
| Rain | - | - | - | - | - | - | - | - |
| Wind | 8mph | 8mph | 9mph | 10mph | 14mph | 14mph | 11mph | 13mph |
| Dew | 32° | 34° | 35° | 32° | 35° | 33° | 32° | 30° |
| RunScore | | | | | | | | |
Great Welsh Marathon 2024
Mar 17, 2024
Partly cloudy throughout the day with rain clearing later.
Low: 50°, High: 54°, Heavy Rain
| Time | 8AM | 9AM | 10AM | 11AM | 12PM | 1PM | 2PM | 3PM |
|---|---|---|---|---|---|---|---|---|
| Temp |  50° | 50° | 51° | 52° | 52° | 54° | 53° | 52° |
| Feel | 50° | 50° | 51° | 52° | 52° | 54° | 53° | 52° |
| Rain | - | light | - | - | - | - | - | - |
| Wind | 18mph | 14mph | 17mph | 21mph | 18mph | 18mph | 18mph | 17mph |
| Dew | 50° | 50° | 50° | 51° | 50° | 50° | 50° | 50° |
| RunScore | | | | | | | | |
Great Welsh Marathon 2022
Apr 22, 2022
Partly cloudy throughout the day.
Low: 43°, High: 61°
| Time | 9AM | 10AM | 11AM | 12PM | 1PM | 2PM | 3PM | 4PM |
|---|---|---|---|---|---|---|---|---|
| Temp | 50° | 51° | 51° | 58° | 57° | 56° | 56° | 58° |
| Feel | 44° | 51° | 51° | 58° | 57° | 56° | 56° | 58° |
| Rain | - | - | - | - | - | - | - | - |
| Wind | 15mph | 11mph | 7mph | 17mph | 21mph | 17mph | 15mph | 17mph |
| Dew | 39° | 41° | 43° | 44° | 43° | 43° | 45° | 45° |
| RunScore | | | | | | | | |
Great Welsh Marathon 2019
Apr 14, 2019
Partly cloudy throughout the day.
Low: 41°, High: 50°
| Time | 9AM | 10AM | 11AM | 12PM | 1PM | 2PM | 3PM | 4PM |
|---|---|---|---|---|---|---|---|---|
| Temp | 41° | 43° | 45° | 46° | 46° | 48° | 48° | 50° |
| Feel | 33° | 34° | 37° | 39° | 40° | 42° | 43° | 44° |
| Rain | - | - | - | - | - | - | - | - |
| Wind | 16mph | 20mph | 19mph | 18mph | 15mph | 16mph | 14mph | 17mph |
| Dew | 29° | 29° | 29° | 29° | 30° | 32° | 30° | 30° |
| RunScore |  | | | | | | | |
Great Welsh Marathon 2018
Apr 15, 2018
Partly cloudy throughout the day with rain.
Low: 48°, High: 54°, Moderate Rain
| Time | 9AM | 10AM | 11AM | 12PM | 1PM | 2PM | 3PM | 4PM |
|---|---|---|---|---|---|---|---|---|
| Temp | 50° | 50° | 50° | 54° | 54° | 52° | 52° | 52° |
| Feel | 44° | 44° | 44° | 54° | 54° | 52° | 52° | 52° |
| Rain | - | - | - | - | light | - | - | - |
| Wind | 17mph | 17mph | 18mph | 16mph | 18mph | 18mph | 18mph | 14mph |
| Dew | 48° | 48° | 48° | 48° | 50° | 50° | 50° | 50° |
| RunScore | | | | |  | | | |
Great Welsh Marathon 2017
May 7, 2017
Partly cloudy throughout the day.
Low: 50°, High: 58°
| Time | 9AM | 10AM | 11AM | 12PM | 1PM | 2PM | 3PM | 4PM |
|---|---|---|---|---|---|---|---|---|
| Temp | 54° | 54° | 55° | 55° | 56° | 57° | 57° | 57° |
| Feel | 54° | 54° | 55° | 55° | 56° | 57° | 57° | 57° |
| Rain | - | - | - | - | - | - | - | - |
| Wind | 2mph | 4mph | 3mph | 9mph | 11mph | 14mph | 14mph | 17mph |
| Dew | 45° | 45° | 46° | 47° | 49° | 49° | 48° | 47° |
| RunScore | | | | | | | | |