The study on the effect of weather parameters on cauliflower seed production was conducted at three locations viz; Nauni, Saproon and Kandaghat during rabi season of 2014-2015 and 2015-2016 in Solan district of Himachal Pradesh. The location Nauni was warmest, followed by Kandaghat and Saproon. Significant variations in seed yield and yield contributing characters of cauliflower were observed due to execution of different weather conditions. The minimum number of days to initiation of seed stalk, flower initiation, 50 per cent flowering, and seed set in cauliflower (Brassica oleracea var botrytis L.) were observed at Nauni, followed by Kandaghat and Saproon. Number of pods per plant and number of seeds per pod were found highest at Saproon (1055.2pods/plant; 18.4seeds/pod) which is coolest location as compared to other two. The maximum seed yield (239.6 kg/ha) was obtained from this location. Nauni and Kandaghat showed reduced seed yield compared to that obtained from Saproon. The lowest seed yield (174.0 kg/ha) was recorded at Nauni. The forenoon humidity during October to December exhibited significant and positive correlation with seed yield. During January to March minimum temperature showed significant and positive correlation with seed yield during April to June.