The paper uses long-term in situ measurement data for 2000–2024 to analyse sea surface temperature variability in the water area near the oyster and mussel farm near the eastern cape of Karantinnaya Bay (Cape Lokhanochka, Sevastopol). This study is a continuation of previously published data for 2000 to 2013. Sea surface temperature measurements were taken once daily using a TM-10 mercury meteorological thermometer. Verification was performed using standard publicly available data from the Chersonesus Lighthouse Marine Hydrometeorological Station. Data comparison revealed similar results at these two observation points. Long-term (25 years) observations in the area of Cape Lokhanochka showed significant sea surface temperature fluctuations on interseasonal and interannual scales. The difference between the maximum and minimum sea surface temperatures over the entire measurement period reached 26°C. The maximum absolute sea surface temperature value (29.8°C) was recorded on 12 August 2010, and the minimum (3.8°C) was registered on 24 January 2006. The average long-term sea surface temperature for the observation period was 15.9 ± 0.2°C. The year of 2024 was noted to be the warmest year in terms of average annual sea surface temperature (17.6 ± 0.7°C), breaking the record of the previous extreme year of 2010 (17.1 ± 0.7°C). The magnitude of the positive linear trend in average annual sea surface temperature was 0.07°C/year. It was noted that climatic sea surface temperature seasons lagged behind the atmospheric ones by one month, whereas the summer season increased to four months due to September. Spring was reduced to two months. It is shown that an increase in winter sea surface temperature values prevents the formation of the cold intermediate layer in its classical definition (temperature ≤8°C). The paper presents average monthly sea surface temperatures for the entire observation period.