Hi Goldy , I have been over that way a few times in march, working , oops that dirty word for those lucky to be retired but inching their way to the end ,  and its been good weather between 20 - 30 degrees . 

jim have a small hiace campervan with all the essentials but have never been across the nullabor before thanks all for the advice

Hiya Goldy - I would think March would be fine for the Nullarbor - not too hot, but not too cold. As people have said above 20 - 30 - perfect.

Great trip going across - so much to see, heading through SA and come to Minnippa - head out to Pildappa Rock for a night or two, beautiful free camp. Kimba - the halfway mark across Oz - has two free camps, one down at the rec ground is a donation camp, with hot showers, water, dump point, nice spots to park. The other is closer to town and is the Lions/Apex Park - nice bbq, toilets, grassy spots.

At Eucla, make sure you go down the back to the old telegraph station, slowly being completely covered with sand.

You can camp on the cliffs at a couple of spots - a great experience. No whales I wouldn't think at that time of the year but at Head of Bight is a great free camp, nothing there, but a big flat area, but stay as long as you like, can use the loos at the Whale Centre through the day.

WA have some great free camps, with toliets, Wi-Fi and dmp point.

Water will be your issue, probably, carry as much as you can from a good source, or buy 10l containers.

Take your time, head off the beaten track, within reason, enjoy the journey.

Thanks Jules ... I have saved that info for my next trip across.

On the 23rd March 2017 it was 43.4C at Nullarbor roadhouse.
www.bom.gov.au/climate/averages/tables/cw_018106_All.shtml
Fact is it could be anything in March and you should be prepared for the extremes.

Cheers,
Peter

Hi Dave,
If your intending to go across the Nullarbor to visit WA for a few months then be aware that Perth and south off can be and usually is cold and hopefully wet in winter. The weather usually turns cold beginning of May. May is the month many Perth grey nomads hook up and head north to get out before the cold weather begins.

We too are heading off at the end of February. From Bribie Island to Pinjarra to catch up with family. We have done this trip several times before, sometimes a bit later on and we just judge the weather on its merits on the day.
Geoff and Bev

I agree there blaze - have heard so many people say how boring it is.. How can they say this - it is one of the iconic Aussie trips Probably because they just get in the car and travel from camp to camp - explore - so much to see out there, and camping on the cliffs is one of my favourite camp spots. We usually have no schedule, if it rains, we just sit and wait it out, if it's too hot, we sit and wait it out a bit. Our aircon in the motorhome (Fiat end) actually froze - guy coming today to give it a service. Before you hit Ceduna turn down and camp at Haslam, about 50k to Ceduna, leave the van -quite safe there, you can fish for squid and fish from the jetty, buy the cheapest, biggest, most delicious oysters from one of the oyster farmers who come round. You can drive down to Streaky Bay for a looksee, or into Ceduna for shopping - watch the fruit and veg you buy though, lots can't go through the quarantine.  Oh, and don't take any honey!

We came back over East in December last year, and it was pretty hot, we also got colds (?? I think we are allergic to leaving WA once we get there) - but the sights were amazing, salt lakes, beautiful green trunked gum trees, not too many people - but enough to be friendly.

Thinking we might go over the top next trip, and down the road through Newman etc. , jus to be different.

Sorry for the ramble, but I am an enthusiastic person, especially when talking travelling this great land we call Australia.