Crater lake · Italy
Lake Nemi
Crater lake in Italy situated 25 km southeast of Rome
- Area
- 1.7km²
- Max depth
- 33m
- Average depth
- 21m
- Elevation
- 318m a.s.l.
- Shoreline
- 5.0km
- Volume
- 0.035km³
Lake Nemi is a crater lake in Italy. It covers 1.7 km². On average it is 21 m deep, and 33 m at its deepest point. Its surface lies 318 m above sea level.
Plan your visit
Stay, sail and get there
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The water
How warm is Lake Nemi?
The water is warmest in July, around 27 °C at the surface, and coldest in January, around 8 °C. The surface averages 20 °C or more from May to September: comfortable for most swimmers.
It does not normally freeze in winter.
On the shore, afternoons reach 28 °C on average in August and 12 °C in January. The driest month is July (25 mm of rain), the wettest November (135 mm).
Average surface temperature measured by the Landsat 8 satellite between 2013 and 2021 at the point furthest from the shore (166 readings). Shallow bays and beaches are often warmer.
From above
The whole lake from space
Month by month
The year at the lake, month by month
Not a forecast: these are averages over many years. Water is the 2013–2021 average; air, rain, sun and wind are the 1991–2020 average.
Water: 2013–2021 averageClimate: 1991–2020 average
| Month | Water°C | Water high°C | Air high°C | Air low°C | Rainmm | Rainy daysdays | Sunh/day | Windkm/h |
|---|---|---|---|---|---|---|---|---|
| January | 8 | 9 | 12 | 9 | 90 | 10 | 3.8 | 17 |
| February | 9 | 10 | 13 | 9 | 86 | 10 | 5.2 | 17 |
| March | 12 | 14 | 14 | 10 | 80 | 9 | 6.7 | 16 |
| April | 16 | 18 | 17 | 13 | 62 | 10 | 8.4 | 15 |
| May | 20 | 23 | 21 | 16 | 57 | 9 | 10.2 | 14 |
| June | 25 | 26 | 25 | 20 | 30 | 6 | 11.9 | 13 |
| July | 27 | 28 | 28 | 23 | 25 | 4 | 12.5 | 13 |
| August | 27 | 28 | 28 | 24 | 27 | 5 | 11.2 | 12 |
| September | 24 | 26 | 25 | 21 | 80 | 10 | 8.3 | 13 |
| October | 20 | 22 | 21 | 17 | 96 | 12 | 6.4 | 14 |
| November | 14 | 17 | 18 | 14 | 135 | 14 | 4.2 | 17 |
| December | 10 | 12 | 14 | 10 | 110 | 13 | 3.8 | 18 |
Water: LakeTEMP (Landsat 8, 2013–2021). Air, rain, sun and wind: NASA POWER, 1991–2020 averages. A rainy day has at least 1 mm of rain. Sunshine hours are derived from measured solar radiation.
Size & depth
How big, how deep
- On average, water stays in the lake for about 5.1 years before flowing out.
- Its catchment drains 14 km² of land.
- About 0.2 m³ of water flow out every second, on average.
Around the shore
What's around Lake Nemi
Counted within 1.5 km of the shoreline in OpenStreetMap, the map anyone can edit.
- 2beaches and swimming spots
La Spiagetta
- —campsites
- —boat hire and water-sport clubs
- —marinas and slipways
- —ferry piers
- 9viewpoints
Il sassone, Vista panoramica Nemi Lago, Terrazza degli Innamorati, Terrazza Panoramica sul Lago di Nemi and 5 more
- 4hotels, B&Bs and chalets
Locanda Specchio di Diana, B&B Il Cortile, Ristorante Monte Artemisio - Villa Artemis Monte Artemisio Resort, B&B il Lago di Nemi.it
- —fishing spots
- 35restaurants and cafés
Towns on the shore
- Genzano di Roma20,582 people
- Ariccia17,487 people
- Nemi1,156 people
Nearest airport with scheduled flights: Ciampino–G. B. Pastine International Airport (CIA), 13 km in a straight line.
Car hire at CIA airport (Rome)Discover Cars · Affiliate linkOpenStreetMap is built by volunteers: when a number is low, it may just mean nobody has mapped it yet.
Recent years
How each month compared
Afternoon high on the shore. The first row is the reference, the 1991–2020 average in °C; the years below show the difference from it: warmer in orange, cooler in blue.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1991–2020 average | 12.5 | 12.6 | 14.4 | 17.0 | 20.6 | 24.8 | 27.7 | 28.1 | 24.8 | 21.4 | 17.5 | 14.0 |
| 2020 | +1.1 | +1.9 | +0.2 | +0.2 | +1.0 | −1.0 | +0.5 | +1.2 | +1.2 | −1.4 | +0.4 | +0.3 |
| 2021 | −0.1 | +1.1 | −0.3 | −1.1 | −1.3 | +0.8 | +0.3 | +0.5 | +1.5 | −0.3 | +0.5 | +0.4 |
| 2022 | +0.2 | +1.4 | −0.3 | −0.2 | +1.9 | +3.4 | +2.4 | +1.3 | +1.1 | +1.4 | +1.1 | +2.1 |
| 2023 | +1.1 | +0.4 | +0.8 | −0.5 | ±0.0 | +0.8 | +1.7 | +0.2 | +1.9 | +2.8 | +1.4 | +1.2 |
| 2024 | +1.7 | +2.4 | +1.2 | +1.1 | +0.4 | +0.3 | +1.8 | +2.6 | +0.7 | +0.9 | +1.1 | +0.5 |
| 2025 | +1.7 | +1.6 | +1.2 | +0.6 | +0.3 | +2.8 | +1.0 | +0.5 | +1.0 | +0.2 | ±0.0 | +1.2 |
+1 warmer than usual −1 cooler than usual
About these numbers
| Outline, area, depth, volume | HydroLAKES v1.0 (Messager et al. 2016) · CC BY 4.0 |
|---|---|
| Water temperature and ice | LakeTEMP v1 (Korver et al. 2024), Landsat 8 2013–2021 · CC BY 4.0 |
| Air, rain, sun, wind | NASA POWER, 1991–2020 · public domain |
| Names and description | Wikidata (Q648679) · CC0 |
| Around the shore | © OpenStreetMap contributors · ODbL |
| Images | EOX Sentinel-2 cloudless 2016 · CC BY 4.0; Wikimedia Commons |
Every figure is an average or a count from a public dataset. Licences and methods: data sources.
