Portsmouth Coastal Waterside Marathon

Portsmouth, England, UK · December 20, 2026
partly-cloudy-day48°·48° high·Windy·Rain possible
10
Register

Race Day Weather

partly-cloudy-day
48°at start
49° high
Windy
Dry
Your goal
0:00:00

Cool start, windy conditions

Runners will face temperatures starting at 48°F and rising slightly to 49°F, with a high humidity of 80% and a dew point of 42°F. Winds will be strong from the WSW at 21 mph, creating a headwind throughout the race. Competitors should adjust their pacing strategy, especially in the wind, and consider hydration carefully.

Race day forecast available in 52 days
partly-cloudy-night10
partly-cloudy-night10
partly-cloudy-night10
partly-cloudy-day10
partly-cloudy-day10
partly-cloudy-day10
partly-cloudy-day10
partly-cloudy-day10
partly-cloudy-day10
partly-cloudy-day10
partly-cloudy-day10
partly-cloudy-night10
partly-cloudy-night10

Pace Calculator

26.2mi
0:00:00
HH:MM:SS
Pace
—

Enter a finish time to see what race day does to it.

Common Goals:

Get forecast alerts for Portsmouth Coastal Waterside Marathon

We'll text or email you when the forecast shifts — so you can adjust gear, pacing, and strategy. Max one per day.

Race Info

The Portsmouth Coastal Waterside Marathon offers runners a festive and scenic journey along the picturesque Southsea seafront and around Langstone Harbour. This flat, multi-terrain course combines road and coastal paths, providing a dynamic running experience with minimal elevation changes—just 108 meters over the entire marathon distance. As you run, you'll be treated to stunning sea views and pass key landmarks like the Tudor Sailing Club and Applegreen garage. The course is renowned for its lively atmosphere, featuring aid stations stocked with treats like jelly beans, Jaffa cakes, and savory snacks. Runners can also enjoy on-site massage and taping services to enhance their race day experience. Whether you're a seasoned marathoner or a novice, this race promises a memorable and accessible challenge amidst the vibrant coastal setting.

Race weekend

Sunday, December 20
8:15 AMMarathon (26.2 mi)
Half Marathon (13.1 mi)
12km of Christmas (7.5 mi)
Area Map

Course Map

FAQ

When is the 2026 Portsmouth Coastal Waterside Marathon?

The 2026 Portsmouth Coastal Waterside Marathon will be held on Sunday December 20, 2026.

What is the time limit for the Portsmouth Coastal Waterside Marathon?

The time limit for the Portsmouth Coastal Waterside Marathon is 7.25 hours.

What will the weather be like for the 2026 Portsmouth Coastal Waterside Marathon?

The forecast calls for a high of 50°F and a low of 47°F with a 18% chance of rain.

Historical Weather

Based on 5 years of data
Avg Temp
46°F
L:45° H:47°
RunScore
10
Conditions
Rain Freq
60%
3 of 5 yrs
Wind13mph
Dew41°F

Temperature History

Range of temperatures during race hours for each year.

Detailed History

YearConditionsLow / HighRainScoreResults
2025
partly-cloudy-night
49°/51°Light
10
2024
partly-cloudy-night
42°/43°-
10
2023
cloudy
49°/50°-
10
2022
partly-cloudy-night
40°/43°Light
9
2013
partly-cloudy-night
46°/50°Light
9