Lake · Switzerland
Lake Hallwil
Lake in Switzerland
- Area
- 9.4km²
- Max depth
- 48m
- Average depth
- 15m
- Elevation
- 445m a.s.l.
- Shoreline
- 18km
- Volume
- 0.140km³
Lake Hallwil is a lake in Switzerland. It covers 9.4 km². On average it is 15 m deep, and 48 m at its deepest point. Its surface lies 445 m above sea level.
Plan your visit
Stay, sail and get there
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The water
How warm is Lake Hallwil?
The water is warmest in August, around 24 °C at the surface, and coldest in January, around 3 °C. The surface averages 20 °C or more from June to September: comfortable for most swimmers.
It does not normally freeze in winter.
On the shore, afternoons reach 23 °C on average in July and 3 °C in January. The driest month is February (65 mm of rain), the wettest May (129 mm).
Average surface temperature measured by the Landsat 8 satellite between 2013 and 2021 at the point furthest from the shore (108 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 | 3 | 4 | 3 | -4 | 83 | 13 | 2.5 | 12 |
| February | 4 | 5 | 4 | -4 | 65 | 11 | 3.7 | 13 |
| March | 7 | 8 | 9 | 0 | 82 | 14 | 5.3 | 13 |
| April | 11 | 13 | 14 | 4 | 83 | 14 | 6.5 | 11 |
| May | 16 | 18 | 18 | 8 | 129 | 17 | 6.7 | 11 |
| June | 21 | 23 | 22 | 12 | 118 | 17 | 8.0 | 10 |
| July | 24 | 25 | 23 | 14 | 124 | 17 | 8.1 | 10 |
| August | 24 | 25 | 23 | 14 | 124 | 15 | 7.3 | 9 |
| September | 21 | 23 | 19 | 9 | 87 | 13 | 6.0 | 10 |
| October | 15 | 18 | 14 | 5 | 96 | 13 | 4.2 | 10 |
| November | 9 | 12 | 8 | 1 | 80 | 13 | 2.4 | 10 |
| December | 5 | 7 | 3 | -3 | 92 | 14 | 2.0 | 12 |
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 14 months before flowing out.
- Its catchment drains 133 km² of land.
- About 3.8 m³ of water flow out every second, on average.
Around the shore
What's around Lake Hallwil
Counted within 1.5 km of the shoreline in OpenStreetMap, the map anyone can edit.
- 2beaches and swimming spots
Pirateninsel
- 4campsites
Stellplatz Käppeli, Campingplatz Tennwil, Camping Seeblick
- 6boat hire and water-sport clubs
Mosenwäldli, Landungssteg Aesch, Schifflände, Restaurant Delphin, Männich AG and 1 more
- 11marinas and slipways
SSH Segelschule Hallwilersee AG and 10 more
- 8ferry piers
Mosen (See), Birrwil (See), Beinwil am See (See), Meisterschwanden Seerose, Meisterschwanden Delphin and 3 more
- 4viewpoints
Rundblick Hallwilersee, Aussicht aufs Seetal, Foto-Spot Schloss Hallwyl
- 7hotels, B&Bs and chalets
Seehotel Delphin, Seerose Resort & Spa, Hallwyl, Jugendherberge Beinwil am See, Aparthotel Beinwil am See and 2 more
- —fishing spots
- 24restaurants and cafés
Towns on the shore
- Reinach7,845 people
- Menziken5,415 people
- Seengen3,288 people
- Meisterschwanden2,459 people
- Sarmenstorf2,322 people
- Boniswil1,436 people
Nearest airport with scheduled flights: Zürich Airport (ZRH), 32 km in a straight line.
Car hire at ZRH airport (Zurich)Discover Cars · Affiliate linkOpenStreetMap is built by volunteers: when a number is low, it may just mean nobody has mapped it yet.
Photos
Seen by visitors
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 | 2.6 | 4.1 | 9.0 | 14.1 | 17.9 | 21.9 | 23.4 | 22.8 | 18.8 | 14.1 | 7.7 | 3.2 |
| 2020 | +2.1 | +4.1 | +0.3 | +3.1 | +0.3 | −1.6 | +0.6 | +0.8 | +1.4 | −1.3 | +1.4 | +0.2 |
| 2021 | −1.5 | +3.3 | ±0.0 | −2.1 | −3.2 | +1.3 | −1.1 | −1.7 | +1.6 | −0.3 | −2.1 | +0.4 |
| 2022 | +0.8 | +2.4 | +2.3 | −0.9 | +2.2 | +2.5 | +2.1 | +1.7 | −0.6 | +4.2 | +2.0 | +1.2 |
| 2023 | +1.9 | +2.3 | +1.8 | −2.0 | +0.2 | +2.5 | +1.1 | +1.2 | +4.5 | +3.4 | +0.4 | +2.2 |
| 2024 | +1.5 | +5.0 | +2.5 | −0.1 | −0.2 | −0.2 | +1.1 | +2.3 | −0.3 | +1.4 | +0.4 | +0.1 |
| 2025 | +1.4 | +1.3 | +1.8 | +1.4 | +0.3 | +2.9 | −0.6 | +1.3 | −0.1 | −0.7 | ±0.0 | +1.8 |
+1 warmer than usual −1 cooler than usual
Nearby
More lakes nearby
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 (Q14465) · 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.
