The sticky transition to traditional ‘build up’ weather starts in earnest in Katherine on the weekend.
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The Sunday maximum is expected to be a hot 38 degrees with a succession of 37 degree days to follow.
The grey nomads are already voting with their feet and numbers have markedly fallen in Katherine over the past week.
The official end of the dry season is September 30 but the months of September are famously hot as well.
The Bureau of Meteorology said there were two phases to the build-up.
The bureau said during the first phase of the build up, we see more clouds in the sky, humidity on the rise and warmer overnight temperatures (from late August and into October)
The second phase is where the storm clouds start to build and we see fairly regular showers and storms in the late afternoon and early hours of the morning (from mid-October to December)
September is usually the first month we feel build-up conditions kicking in, with the warmer nights (average overnight temperature in September of 19.9°C versus 20.3°C in August and 15°C in July) and more humidity in the afternoons (47% relative humidity at 3pm versus 40% in August and 37% in July).