Officials at the Environment Agency have blamed the recent heatwave for the deaths of thousands of freshwater fish, across the region.
The intense heat has caused oxygen levels in the water to plunge. There have been reports of fish in distress in Welney in Norfolk and Tiptree in Essex.
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It will be a largely cloudy but humid day with the risk of hit-and-miss heavy showers and thunderstorms.
It will turn dull and misty again overnight but it will stay mild. Tomorrow will be mostly cloudy with a risk of localised heavy showers.
Group Lotus has announced plans to shed over 300 jobs in a restructuring and cost-cutting move.