Arch of Janus
Archaeological Site Quadrifrons Roman arch at Forum Boarium, Rome
A fourth-century quadrifrons arch in Rome, the Arch of Janus survives as layered ruins near the forum area; visitors include archaeology enthusiasts tracing imperial monuments on foot.
Arch of Janus (Arco di Giano) is a Roman quadrifrons arch in Rome, notable for having four faces and four passageways. It dates to the late Roman imperial period.
The arch is primarily appreciated for its unusual four-sided form and surviving masonry, which make it an easily recognisable fragment of late Roman urban fabric. It stands in situ among other ancient monuments, allowing close inspection of construction and reused decorative fragments.
Generally dated to the late Roman imperial era, the monument was erected as a tetrapylon-type arch and served as an architectural marker in the city; its precise dedicatory purpose is not definitively recorded. Over time it has been repaired and partly reused in later periods but retains its core structure.
Located near the Forum Boarium area in Rome, the arch sits close to the Tiber and other ancient sites in the city centre.
- Form: A quadrifrons, or four-faced, arch - rare in Roman architecture - giving it four passageways arranged around a central pier.
How to Get to Arch of Janus #
The Arch of Janus (Arco di Giano) is in central Rome, in the area of the Roman Forum/Capitoline Hill. The nearest metro is Colosseo on Line B; from Colosseo station it’s about a 10-15 minute walk along Via dei Fori Imperiali and adjacent streets into the forum area where the arch stands.
If driving, the site is within Rome’s centro storico and is best reached by parking outside the ZTL (limited-traffic) zone and walking; many city buses and tourist shuttles also stop at or near the Colosseo/Roman Forum area.
Best Time to Visit Arch of Janus #
Best in spring or autumn when temperatures are comfortable for walking between outdoor Roman landmarks.
Weather & Climate near Arch of Janus #
Arch of Janus's climate is classified as Hot-Summer Mediterranean - Hot-Summer Mediterranean climate with warm summers (peaking in August) and cold winters (coldest in January). Temperatures range from 4°C to 30°C. Moderate rainfall (712 mm/year).
January
January is the coolest month with highs of 12°C and lows of 4°C. Moderate rainfall (74 mm) and partly cloudy skies.
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February
February is cold with highs of 13°C and lows of 4°C. Moderate rainfall (67 mm) and partly cloudy skies.
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March
March is cool with highs of 16°C and lows of 6°C. Moderate rainfall (60 mm) and partly cloudy skies.
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April
April is cool with highs of 18°C and lows of 8°C. Moderate rainfall (58 mm) and partly cloudy skies.
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May
May is cool with highs of 23°C and lows of 12°C. Moderate rainfall (41 mm).
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June
June is mild with highs of 27°C and lows of 16°C. Light rainfall and mostly sunny skies.
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July
July is warm with highs of 30°C and lows of 19°C. The driest month with just 15 mm and clear sunny skies.
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August
August is the warmest month with highs of 30°C and lows of 19°C. Moderate rainfall (33 mm) and clear sunny skies.
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September
September is mild with highs of 26°C and lows of 16°C. Moderate rainfall (65 mm) and mostly sunny skies.
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October
October is cool with highs of 22°C and lows of 12°C. Regular rainfall (89 mm).
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November
November is cool with highs of 16°C and lows of 8°C. The wettest month with 97 mm of rain and partly cloudy skies.
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December
December is cold with highs of 13°C and lows of 5°C. Regular rainfall (84 mm) and partly cloudy skies.
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