The concern of the study was to investigate into secondary school teachers’ knowledge of climate, its impacts and mitigation strategies. Stratified and simple random sampling techniques were used in selecting the respondents for the study. The instrument for data collection was a questionnaire named Teacher Climate Change Knowledge Question (TCCKQ). The questionnaire was structured by the researchers and validated by experts. The findings revealed that teachers have the knowledge of climate change impacts on man, animals, their environment, as well as the different mitigating strategies. Revealed also is the disparity between teachers’ knowledge of climate change in urban and rural secondary schools. The implication of the findings is that success of climate change education depends on the knowledge of the teacher on the subject. It is recommended that climate change education be introduced into the teacher training institutions and regular training and workshops be organized for teachers.