A field experiment was conducted at Regional Agricultural Research Station farm of S. V. Agricultural college , Tirupati in a split plot design with four main treatments i.e. Varieties (V1- Narayani, V2- Dharani, V3- K-6 and V4- TMV-2) and three minor treatments i.e. dates of sowing (D1-June 21st, D2- July 14th, D3- July 30th). The data on crop weather interactions in terms of temperature GDD (Growing degree days), day length (Photothermal unit), sunshine hours (Heliothermal unit) and Heat use efficiency (HUE) were calculated for the four varieties sown at three different dates of sowing at grain filling stage (days to first pod initiation to physiological maturity). Temperature, photoperiod and sunshine hours had positive influence with grain filling stage i.e. from days to first pod initiation to physiological maturity. Heat use efficiency (HUE) was also observed to be an important parameter for yield potential in groundnut. Significant variation was observed for yield among the varieties and dates of sowing. Among the varieties, yield and shelling percentage was higher for Dharani (V2) followed by K-6 (V3), TMV-2 (V3) and Narayani (V1) respectively. Evaluating the dates of sowing, June 21st sowing (D1) recorded higher yield followed by July 14th sowing (D2) and July 30th sowing (D3) respectively.