The storms currently battering parts of the Riverina are expected to result in up to 70 millimetres of rain by the end of the week.

Wednesday and Thursday were expected to be the wettest days of the week, but the Bureau of Meteorology has forecast the storms to potentially continue into the weekend.

Downside broadacre crop farmer David Meiklejohn said the rain was a good boost for his crops as he prepares for harvest at the end of November.

"The forecasts are saying there is going to be reasonably decent falls of rain until Friday and to be honest that will be fantastic," Mr Meiklejohn said.

"The crops are all looking quite good and the ground they're in has dried out, so this will be fantastic to help them get through the end of their growing cycle and hopefully form lots of seed."

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Mr Meiklejohn said he expects almost all farmers across the region to be happy with the burst of rainfall - regardless of when their harvest is.

"I'd imagine that anybody that is dryland cropping will be very, very happy to see the decent fall of rain at this time of the year," he said.

"But also on my farm I produce lambs for supermarkets and butchers and I've only just recently sown a fairly big paddock which is only just coming up through the ground now."

"This rain should be fantastic to get that up and away for the summer growth as well, so it's really a benefit for the winter crops finishing off and also the young stuff that is just emerging."

The storms blanket most of the Riverina and growers in Griffith are also welcoming the rainfall.

Riverina Winegrape Growers Association chairman Bruno Brombal said the conditions will be a boost for those growing grapes and citrus - so long as the storms don't become too severe.

Mr Brombal said if the severe thunderstorms hitting the region this week dump hail, it could prove a disastrous start to the season for many farmers.

"The grapes are only about six inches long at the moment so heavy rain won't really affect them but what will affect them will be if we get hail," Mr Brombal said.

"A hailstorm can just wipe out citrus, grapes, canola, wheat. Wherever it hits it just wipes out and that would be disastrous."

Mr Brombal admitted he was "definitely worried" about the potential impact of hail.

Wine grape growers are not set to harvest until the end of January and many of their crops have only just begun to sprout - meaning any problems now could prove season-defining.

The Bureau of Meteorology has warned the severe storms across the Riverina could feature damaging winds and large hail.

The heavy rainfall could also result in flash floods, according to the bureau.

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