Ex-Tropical Cyclone Esther is moving across western NSW and is expected to hit the MIA on Wednesday, with the Bureau of Meteorology predicting Griffith is due to receive between 60 and 100 millimetres of rainfall on Wednesday and Thursday with a possibility of thunderstorms, potentially delivering a month's worth of rain to the city within the span of 48 hours.

The average amount of rainfall during the month of March recorded at Griffith Airport is 35.2mm.

Leeton and Coleambally are also due to receive rainfall, with both areas predicted to receive between 30 and 60mm of rain over the two days.

The Bureau has issued a severe weather warning for the Riverina, with heavy rainfall over elevated parts of the area potentially resulting in localised landslips.

A initial flood watch has also been issued by the State Emergency Service for potential minor flooding in areas along Mirrool Creek and low-lying areas along the Murrumbidgee River.

It is recommended to livestock and equipment is moved away from flood-prone paddocks and community members monitor weather forecasts and warnings over the coming days if flooding develops.

The rain is due to add to a solid amount of rain seen during February - with a total of 85mm recorded across the month in what was the highest total recorded since 2011.

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Rain will be welcome news to MIA irrigators as the area leaves behind a summer season which started out record-breaking but became one of the cooler summers in recent years as the season moved into 2020.

December 2019 saw the hottest final month of the year on record, clocking in at an average maximum of 35 degrees, while January saw a marked decrease from the record high mean of 39.1 degrees seen in 2019 despite hitting a new high on the thermometer with a 47.2 degree high on January 4.

The first month of 2020 saw an average maximum temperature of 35.2 degrees, while February saw an average maximum temperature of 30.7 degrees in what was the coolest final month of summer recorded since 2012.