The paper presents an updated Southern Hemisphere (SH) radiocarbon calibration curve, SHCal13, which extends the range of measurements to 2145 cal BP and includes new data sets, such as the ANSTO Younger Dryas Huon pine data. The curve is based on measured data from 0–1000 cal BP and ANSTO Huon data from 325–175 cal BP, extended to 2145 cal BP with Waikato kauri and Huon data sets and modified CAMS Huon data. The underlying calibration curve is constructed using a Markov chain Monte Carlo (MCMC) implementation of the random walk model. For calendar ages outside the measured range, the SHCal13 curve is adjusted by a modeled interhemispheric offset of 43 ± 23 years, derived from the NH data set (IntCal13) using a random effects model. The interhemispheric offset is estimated to be 43 ± 23 years, consistent with previous measurements. The SHCal13 curve is extended to 50,000 cal BP, assuming similar interhemispheric offset levels. The paper also discusses the variability in the interhemispheric offset and the implications for radiocarbon dating in tropical and neotropical regions.The paper presents an updated Southern Hemisphere (SH) radiocarbon calibration curve, SHCal13, which extends the range of measurements to 2145 cal BP and includes new data sets, such as the ANSTO Younger Dryas Huon pine data. The curve is based on measured data from 0–1000 cal BP and ANSTO Huon data from 325–175 cal BP, extended to 2145 cal BP with Waikato kauri and Huon data sets and modified CAMS Huon data. The underlying calibration curve is constructed using a Markov chain Monte Carlo (MCMC) implementation of the random walk model. For calendar ages outside the measured range, the SHCal13 curve is adjusted by a modeled interhemispheric offset of 43 ± 23 years, derived from the NH data set (IntCal13) using a random effects model. The interhemispheric offset is estimated to be 43 ± 23 years, consistent with previous measurements. The SHCal13 curve is extended to 50,000 cal BP, assuming similar interhemispheric offset levels. The paper also discusses the variability in the interhemispheric offset and the implications for radiocarbon dating in tropical and neotropical regions.