Weston Marine Lake is filled by overtopping tides from the Bristol Channel. Guide temperatures for the sea water in the Bristol Channel can be accessed here. As a comparatively small body of water, the water temperature in Weston Marine Lake is more sensitive to air temperature changes, and ranges on average from 3°C to 19°C across the year, warming and cooling more quickly than the sea early and late season. Fundraising is taking place to install a similar temperature gauge to Clevedon's Marine Lake.