Southwick Beach sea temperature
Sea-surface temperature for Southwick Beach, United Kingdom, with the 7-day outlook and what to wear.
What is the sea temperature at Southwick Beach today? (3 Sept)
The sea at Southwick Beach is 19.7 °C today. Most people want a shorty, especially once the wind picks up. The sea and the air are within a degree or so of each other.
Southwick Beach sea temperature — next 7 days
Sea temperature varies by under 1.2 °C across the week.
| Date | Sea temp | Range | Suggested wetsuit |
|---|---|---|---|
| Thu 3 Septtoday | 19.6 °C | 19.5–19.7 °C | 2 mm shorty or spring suit |
| Fri 4 Sept | 19.8 °C | 19.7–19.8 °C | 2 mm shorty or spring suit |
| Sat 5 Sept | 19.7 °C | 19.6–19.8 °C | 2 mm shorty or spring suit |
| Sun 6 Sept | 19.4 °C | 19.3–19.5 °C | 2 mm shorty or spring suit |
| Mon 7 Sept | 19.5 °C | 19.3–19.8 °C | 2 mm shorty or spring suit |
| Tue 8 Sept | 19.3 °C | 19.1–19.6 °C | 2 mm shorty or spring suit |
| Wed 9 Sept | 18.8 °C | 18.6–19.1 °C | 3/2 mm full suit |
Figures are modelled sea-surface temperature, not readings from a buoy or a thermometer in the shallows — expect a degree either way, and more in a shallow bay on a hot afternoon. Wetsuit suggestions are general guidance: cold tolerance varies a lot between people, and wind, session length and air temperature matter as much as the water does.
What wetsuit for what sea temperature?
| Sea temperature | Wetsuit | Extras |
|---|---|---|
| 24 °C and above | Boardshorts or swimsuit | — |
| 22–24 °C | Rash vest or 1 mm top | — |
| 19–22 °CSouthwick Beach today | 2 mm shorty or spring suit | — |
| 17–19 °C | 3/2 mm full suit | — |
| 14–17 °C | 4/3 mm full suit | boots on longer sessions |
| 11–14 °C | 5/4 mm full suit | boots and gloves |
| 7–11 °C | 5/4/3 mm hooded full suit | boots and gloves |
| Below 7 °C | 6/5 mm hooded full suit | thick boots and gloves |
Conditions at Southwick Beach
Water temperature is one input. For wave height, wind and a 0–100 score per sport and ability level, see the full forecast.
Frequently asked questions.
What is the sea temperature at Southwick Beach today?
The sea at Southwick Beach, United Kingdom is 19.7 °C today. This is modelled sea-surface temperature rather than a buoy reading, so allow a degree either way.
What wetsuit do I need at Southwick Beach?
At 19.7 °C, 2 mm shorty or spring suit is the usual choice at Southwick Beach. Most people want a shorty, especially once the wind picks up. Cold tolerance varies, and wind and session length matter as much as the water temperature.
Is the sea warm enough to swim at Southwick Beach?
At 19.7 °C the sea at Southwick Beach is swimmable but brisk — fine for a short swim, and most people want a wetsuit for longer.
How much does the sea temperature at Southwick Beach change over a week?
Over the next 7 days the sea at Southwick Beach stays between 18.6 °C and 19.8 °C. Open water changes temperature slowly, so it rarely moves much inside a week — seasonal change is what matters.
