I'S going to be a warm and mostly dry end to the week in western NSW, despite daily showers in eastern parts of the state.
A warm air mass will gradually spill over NSW during the next few days as a low pressure trough approaches from the west.
Temperatures are forecast to reach the low to mid thirties in the state's west by Friday and could get close to 40C in some areas during the weekend.
Griffith is tipped to reach about 36C to 37C, which is 4C to 5C above average for this time of year.
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The burst of warmth is occurring because of a recent break in the monsoon over northern Australia, which has allowed heat to build up over the interior, under predominantly clear skies.
Now, a trough is drawing this hot air into NSW from the west.
Earlier this month, low pressure troughs passing over NSW from the west were able to draw moisture from the tropics and produce widespread rain.
Now, the clouds and rain have been replaced by warmer, drier air.
But while western NSW will miss out on most of the rain in the coming days, eastern NSW is stuck in a wet weather pattern.
Onshore winds have been causing clouds and showers to persist along the state's coast and adjacent ranges this week.
These showery onshore winds will continue through the end of the week and possibly into the start of next week, particularly over the state's north east.
Most of the showers in the coming days will be confined to the eastern side of the ranges, although some wet weather could briefly make it over the divide.
Looking further ahead, the latest seasonal forecasts suggest that inland districts of NSW could see above-average rainfall and below-average daytime temperatures during autumn.
This outlook is being influenced by La Nina in the Pacific Ocean, which has now passed its peak but will still continue to influence Australia's weather in the coming months.
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