Great South Run

Southsea, Portsmouth, England · October 18, 2026

57°·59° high·Windy·Dry

Weather

Race Day Weather

57°at start

59° high

Windy

Dry

Mild temps, strategic wind adjustments

Runners will face temperatures starting at 57°F and peaking at 59°F, with high humidity at 78%. A tailwind in miles 1-2 will aid early pacing, but a headwind in mile 6 requires a conservative approach. With wind gusts up to 26 mph, runners should anticipate crosswinds in miles 3-5 and 7-10, adjusting their lines accordingly. Hydration will be essential due to the humidity.

Race day forecast available in 5 days

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Distance: 10.0mi

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Race Info

The Great South Run is an annual 10-mile road race in Portsmouth, England, first held in 1990. The flat, largely coastal course starts near Southsea Castle and finishes along the Southsea seafront, passing Portsmouth Historic Dockyard and the Spinnaker Tower. It hosts the UK Athletics 10-Mile Championships and draws over 20,000 finishers most years.

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FAQ

When is the 2026 Great South Run?

The 2026 Great South Run will be held on Sunday October 18, 2026.

What will the weather be like for the 2026 Great South Run?

The forecast calls for a high of 60°F and a low of 56°F with a 15% chance of rain.

Historical Weather

Based on 20 years of data

Avg Temp

57°F

L:55° H:58°

RunScore

Conditions

Rain Freq

55%

11 of 20 yrs

Wind14mph

Dew50°F

Temperature History

Range of temperatures during race hours for each year.

Detailed History

Year	Low / High	Rain	Dew Point
2025 Great South Run Partly cloudy throughout the day with rain. 2025	58°/59°	Light	58°
2024 Great South Run Partly cloudy throughout the day with rain. 2024	60°/62°	Light	58°
2023 Great South Run Clear conditions throughout the day. 2023	50°/53°	-	34°
2022 Great South Run Partly cloudy throughout the day with afternoon rain. 2022	58°/61°	Light	51°
2021 Great South Run Partly cloudy throughout the day with a chance of rain throughout the day. 2021	58°/64°	Light	54°
2019 Great South Run Partly cloudy throughout the day. 2019	50°/55°	-	45°
2018 Great South Run Clearing in the afternoon. 2018	57°/64°	-	54°
2017 Great South Run Becoming cloudy in the afternoon with rain. 2017	53°/57°	-	44°
2016 Great South Run Clearing in the afternoon with morning rain. 2016	50°/54°	-	43°
2015 Great South Run Partly cloudy throughout the day with rain. 2015	49°/55°	Light	43°
2014 Great South Run Partly cloudy throughout the day with a chance of rain throughout the day. 2014	61°/61°	Light	59°
2013 Great South Run Partly cloudy throughout the day with rain. 2013	59°/61°	Light	56°
2012 Great South Run Partly cloudy throughout the day with rain. 2012	43°/50°	Light	44°
2011 Great South Run Partly cloudy throughout the day with a chance of rain throughout the day. 2011	59°/60°	Light	58°
2010 Great South Run Partly cloudy throughout the day with morning rain. 2010	46°/52°	-	38°
2009 Great South Run Partly cloudy throughout the day. 2009	58°/61°	-	52°
2008 Great South Run Partly cloudy throughout the day with rain. 2008	54°/57°	Light	55°
2007 Great South Run Partly cloudy throughout the day with a chance of rain throughout the day. 2007	57°/58°	Light	57°
2006 Great South Run Partly cloudy throughout the day with early morning rain. 2006	61°/63°	-	59°
2005 Great South Run Partly cloudy throughout the day with rain clearing later. 2005	56°/61°	-	46°