The temperatures actually haven't been too bad Silver. There was a nice breeze the whole time we were digging.
I've recently started venturing out to dig in summer and have been surprised by how bad it usually
wasn't. Three times at Lowmead this month, usually the hottest month of the year and it hasn't been that bad at all. Father-in-law and I went to Mount Gibson twice this time last year and were again surprised that the temperatures were in fact
not lethally hot, even there in Far North QLD.
As far as I'm concerned now, the only things likely to put a spanner in the works are fair dinkum heatwave conditions or rain. You can check both on BoM before you consider going. I check the temperature and rain forecasts for both Gladstone and Bundaberg before going to Lowmead, gives me a bit of an idea since the place is between the two. I also check
this handy BoM page. There are hundreds, possibly thousands I guess of these little remote rainfall recording stations dotted all about the place, seemingly transmitting a continual stream of local data back to BoM. They appear to be meant to supply rainfall data to the bureau for the purpose of flood/stream level monitoring. Any one of them close by to the place you intend to go digging will tell you how much rain - if any - there has been over the past 24 hours: very handy thing to know since if we get there and the ground is just mud after 3-4 inches of rain the trip is wasted and small creek crossings might be impassable that day anyway.
Move the mouse pointer over the dots on the map, each one is a remote station. The one close to Lowmead is Mimdale and I see this morning it has had 2mm of rain in the past 24 hours - not enough to bother fossickers. Give it a go