There is a colder shift over the southeast today with a period of frosty nights on the way which will lead to a drop in soil temperatures for the region. Coupled with the above average soil moisture, this may increase the speed of the cooling process for some southeast inland regions.

Out west, the soil temperatures are above average after a warm fortnight and while it has been raining, there has been ample sunshine throughout this time.

SA seeing above average soil temperatures but below average soil moisture, so with the increased moisture coming through during the end of the month and into Winter, the soil temperatures should begin to come down and move back to average by early June.

Soil Temperatures - Next 2 Weeks - Southeast Australia

Note the temperatures are near seasonal for most areas in the east with elevated to excessive soil moisture values. We have frosty nights in the coming days for the region, but the daytime temperatures are forecast to be seasonal to above seasonal. This will override the colder mornings in the coming days and so the temperatures should stay steady for most Ag Areas in the coming days. It won't be until later next week into the first week of June, that with persistent rainfall and colder westerly winds, we will see the soil temperatures come down with the air temperatures from that time moving below average for a significant period of time.

Soil Temperatures - Next 2 Weeks - Western Australia

The soil temperatures are near seasonal over much of the state at the moment but that starts to shift, with temperatures forecast to fall away from next week as a broad cloud band, deep westerly flow and cold airmass feeding through from mid next week until early June and this will see temperatures fall well away as we move into Winter with above average soil moisture to work with.


The warmer end to the month over the southeast and east will offset the cold nights and severe frost potential over the southeast inland over coming days. The warmer air being drawn in from the north and northwest in a broad northwest flow that is developing ahead of a large-scale long wave. The cooler bias over the western interior has been thanks to deep cloud cover but will continue in this period thanks to widespread cloud and rainfall coverage. That colder bias will spread over the east a week later.


The shift in the pattern bringing the colder air from WA into the eastern states with persistent shower coverage will lead to a lowering of soil temperatures with increasing moisture values for southern and southeast areas. Milder weather over in the west with high pressure moving into the Bight leading to a northwest flow will see a few warmer days ahead of the next wave of cold fronts due in there during Queens Birthday. The northern tropics see drier air surging northwards. This could bring down the soil temperatures for parts of southern QLD which are too, excessively wet, so with this drier air, it will assist in not only lowering temperatures but dry out some catchments a little.


Wednesday 18th May

You can see the cloud band moving through the interior of the nation with areas of rain. Sunshine hours are reduced to no sun in the darker zones and bright yellow is your 10-12 hours of sunshine which is clearly over northern Australia in line with the dry season. So, reference the satellite picture and this chart verify this data.

You can see the impact of the east coast trough with areas of rain and thick cloud this weekend, with dry weather for the southeast with plenty of sunshine after cold starts over the southeast and southern inland.

Cloudy skies return to the south and southeast with frontal weather later next week, noting the large-scale cloud band forecast to move in from the west of the nation with the moisture being drawn south rather than east, this setting up a very large cloud band to sweep the south of the country during the end of the month.

Nothing too outrageous in terms of soil temperatures this year, they are lower than last year this time looking at the data from last year, but moisture is a lot higher. With the seasonal shift to the westerly wind belt occurring this week and persisting into June, it is safe to say temperatures are set to lower for the Ag areas.

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