Nilometer
Historical Site Ancient Egyptian structure for measuring Nile flood levels
The Nilometer on Roda Island in Cairo measured Nile levels for centuries; visitors study its stairway-and-column structure and its role in Islamic and medieval Egyptian administration.
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The Nilometer on Roda Island in Cairo is an early medieval hydrological structure erected to measure the height of the Nile’s flood. It dates to the 9th century and is one of the best-known historic nilometers.
The nilometer consists of a stone-lined well or chamber with a graduated column and stepped access, which allowed officials to read the river level directly. It is of interest for its engineering design and its role in ancient and medieval Nile management.
Constructed in the 9th century, the nilometer was used by Islamic and later Egyptian administrations to gauge annual inundation and to help determine taxation and agricultural planning. Its function continued in various forms for many centuries.
The structure sits on Roda (Rhoda) Island in the Nile within the Cairo urban area, where it is part of the city’s collection of early medieval monuments.
- Function: The structure is an example of ancient hydraulic engineering and originally served to record the Nile's annual flood levels for administration and taxation.
How to Get to Nilometer #
Reach the area by taxi or metro to Ramses and then a short taxi or walk into Old Cairo/Roda Island. The site is adjacent to the southern tip of Roda Island; combine with a Coptic Cairo walking route.
Tips for Visiting Nilometer #
- Combine a visit with nearby Coptic Cairo sites (Hanging Church, Ben Ezra) for a full day in the quarter.
- Bring sunscreen and a hat for the riverbank exposure; light is harsh mid-day.
- Seek out the explanatory panels or local guides-what looks like a simple well is actually a centuries-old hydrological instrument with a precise purpose.
Best Time to Visit Nilometer #
Best visited during the cool months (November-February) when Cairo's heat is tempered for outdoor exploration.
Weather & Climate near Nilometer #
Nilometer's climate is classified as Hot Desert - Hot Desert climate with hot summers (peaking in July) and cool winters (coldest in January). Temperatures range from 8°C to 35°C. Very dry conditions with minimal rainfall with a pronounced dry season.
January
January is the coolest month with highs of 20°C and lows of 8°C. Almost no rain.
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February
February is cool with highs of 21°C and lows of 9°C. Almost no rain.
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March
March is cool with highs of 24°C and lows of 11°C. Almost no rain.
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April
April is mild with highs of 28°C and lows of 15°C. Almost no rain.
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May
May is warm with highs of 32°C and lows of 18°C. Almost no rain and mostly sunny skies.
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June
June is warm with highs of 34°C and lows of 20°C. The driest month with just 0 mm and clear sunny skies.
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July
July is the hottest month, feeling like 28°C. The driest month with just 0 mm and clear sunny skies.
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August
August is hot, feeling like 28°C. The driest month with just 0 mm and mostly sunny skies.
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September
September is warm with highs of 33°C and lows of 20°C. The driest month with just 0 mm and clear sunny skies.
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October
October is mild with highs of 30°C and lows of 18°C. Almost no rain and clear sunny skies.
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November
November is mild with highs of 25°C and lows of 13°C. Almost no rain and mostly sunny skies.
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December
December is cool with highs of 21°C and lows of 9°C. Almost no rain and mostly sunny skies.
