The exact relationship between people’s climate change attitudes and behaviour is a topic that engages policy-makers and researchers worldwide. Do climate change attitudes influence behaviour or is it possible that behaviour can change attitudes? This study uses a unique repeated survey dataset of 275 farmers (irrigators) in the southern Murray-Darling Basin from 2010-11 to 2015-16, to explore the dynamic relationship between climate change attitudes and farm adaptation behaviour. Farmers who had an increased risk exposure (expressed through higher debt, larger irrigated areas, greater share of permanent crops, and located in areas with higher temperatures and less rainfall) were more likely to agree climate change posed a risk. Whilst farmers became more accepting towards climate change over the time-period, a significant percentage of these attitudes were unstable. We suggest one reason for this instability is due to the presence of reverse causality (a feedback loop) between attitudes and behaviour. Namely, new evidence was found that farmers who agreed climate change was a risk in 2010-11, were more likely to undertake farm decisions to reduce that risk (e.g. changing crop mix, reducing irrigated area and consequently selling water entitlements) – which had the impact of negatively feeding back and reducing their stated climate change concerns in 2015-16. Conversely, farmers who were originally deniers were more likely to undertake somewhat riskier farm-production decisions (e.g. increasing water utilisation rates and irrigation areas) – which consequently had the impact of positively increasing their climate change risk perceptions in 2015-16.