Despite the relatively mild start to the month of May, Griffith has now experienced a straight fortnight of above-average temperatures.
The mercury peaked at 26 degrees on Monday, which is only 2.6 degrees off being the hottest day in May since official recording of temperatures started in Griffith in 1971.
The fortnight before Tuesday averaged a maximum temperature of 23.4 degrees which is comfortably above May’s normal average of 19.2 degrees.
Meteorologist at Weatherzone, Robert Sharpe, said this consistent warm stretch of weather is extremely rare for this late in the season.
“The reason we’ve seen this consistent warm weather is because of a high pressure system that has remained over the coast of New South Wales,” he said.
“This high pressure system has trapped warm air over much of southern NSW which has blocked a cold front from moving up from the south.”
The strong high pressure system has also resulted in Griffith only seeing 0.2 millimetres of rain in the fortnight before Tuesday.
Mr Sharpe predicted a low trough should eventually move across from South Australia and parts of Victoria to the Riverina by the weekend.
This low trough is likely to produce up to 20 millimetres of rainfall on Saturday and the minimum temperature to drop down to seven degrees.