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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Outbreaks of rain, perhaps thundery, clearing northwards during the morning, then a mainly dry day with a chance of showers following.
Rain spreading north tonight and perhaps thundery at times, but a drier day tomorrow with minimum temperatures of 10 deg C
Organiser's of Peterborough's 33rd Truckfest say around 30,000 people have visited the event over the last two days.