Background: One of the world's most common health issues is high blood pressure. Hypertension's dangers are well-documented and have been shown in numerous large-scale investigations. Seasonal variation in blood pressure is largely due to changes in the temperature of the surrounding environment. Several studies have found a negative correlation between the temperature outside and blood pressure. No observational study has been done in Egypt so far using either healthy people or patients to examine the effect of weather on blood pressure. Evidence suggests that seasonal fluctuations in ambient temperature have an impact on cardiovascular events and blood pressure levels.   Objective: Study the blood pressure levels in the winter and summer to see whether they differ. Conclusion: In both men and women, young and elderly, the seasonal change in BP appears to be a global phenomenon that has been documented in regions with varying climate conditions.