With a population of around 15,100, Adelphi sits in Maryland, United States. The city operates in the Eastern Time Zone.
In 2025, Adelphi averaged an annual temperature of 56°F, with hottest temperatures reaching 101°F in June and lowest around 7°F in January. The city received approximately 50 inches of precipitation during the year.
View historical weather for Adelphi · More cities in Maryland