Another bout of spring-like weather is in store for much of NSW including Sydney, possibly putting some July warmth records in play by the weekend.

Only Thursday looks likely to break from the run of relatively mild days with top temperatures five to six degrees above the July average of 16.4 degrees, the Bureau of Meteorology predicts. Even Thursday, though, will be on the mild side with 18 degrees tipped.

Sports enthusiasts' dilemma: surf board or snowboard? Credit:Karleen Minney

At this stage, Sunday's forecast top of 25 degrees would match a typical summer's day, and could challenge the July record maximum of 25.9 degrees set in 1990.

A range of other sites in the state, such as Bourke in the far north-west, may also nudge monthly records, said Tom Hough, a meteorologist with Weatherzone. Bourke's forecast top of 28 degrees is not far off its July record of 28.9 degrees.