The Bureau of Meteorology (BoM) has issued a flood watch for a number of local catchments, which are already soaking wet after weeks of rain.

Locations which could be affected include the Peel River, which flows through Tamworth, the Gwydir River and the Upper Macintyre River.

Western Zone Commander for the NSW State Emergency Service (SES), David Monk, warned the flooding could be minor to moderate and could start imminently.

"This weather system is expected to cause flooding for the catchments listed from Sunday and into the week," Mr Monk said.

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"This flood watch means that people living or working along rivers and streams must monitor the latest weather forecasts and warnings and be ready to move to higher ground should flooding develop."

Official flood warnings will be issued if river levels are expected to rise to above the minor flood level, and the BoM will provide updates as the situation evolves.

Mr Monk said people who may be affected by the impending weather should take the time now to prepare their property for flooding.

"This includes moving stock to higher ground, moving pumps for creeks and rivers and having adequate resources on hand including food and water, should your property become isolated for a period of time," he said.

Tamworth SES crews are on hand for anyone who may need assistance when the weather hits, but Triple Zero should be dialled for life-threatening emergencies.

The BoM has forecast 100 per cent chance of rain on Monday, and warned it could be heavy.

The authority is expecting rain to fall on Tuesday as well, and is expecting between 50mm and 80mm to be dumped on Tamworth.

A severe weather warning is current in Tamworth and Gunnedah, with the BoM predicting heavy rain to be dumped on the towns.

The SES has reminded people to never walk, ride or drive through floodwater.

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