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
That OG frictionless feeling. Body Glide Original Anti-Chafe Balm.
When you buy through our links, we may earn a commission.
Wanna to know when the weather changes? .
Race Overview
The Great Welsh Marathon moves to Swansea for its 2027 edition on Sunday 17 October 2027, after more than ten years in Carmarthenshire. The 26.2-mile course is planned as a single loop that starts and finishes in the city and runs along Swansea Bay, with the full route due to be announced in November 2026. It is organised by Front Runner Events and targets 7,500 runners.
WikipediaFAQ
When is the 2027 Great Welsh Marathon?
The 2027 Great Welsh Marathon will be held on Sunday October 17, 2027.
Is the Great Welsh Marathon a Boston Marathon Qualfier?
Yes, the Great Welsh Marathon is an official Boston Marathon qualifier.
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 | | | | | | | | |