Tamworth's main water supply had hit 86.6 per cent on Monday afternoon after water gushed in over the weekend.

The dam has risen by more than five per cent in the past week alone, after soaking rain fell in the catchment.

The weather station at the head of the Peel River clocked 33mm of rain in a soaking wet three days at the end of last week.

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The last time the dam was at a level of more than 86 per cent was back in December 2017, more than three-and-a-half years ago.

The dam has risen by more than 20 per cent since this time last month, which would make a noticable difference for visitors, with the water level going up by 3m.

The Tamworth region is expecting more of the wet stuff this week, with rain forecast on Wednesday, Thursday, Friday and Saturday.

The dam only needs about 13,000ML of water to flow in - or 5200 Olympic swimming pools - to fill up and spill.

The last time Chaffey Dam filled up was in October 2016.

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