Bostalsee
Germany · Windsurf · Wingfoil · SUP
- Best winds W, SW
- Level Beginner · Intermediate
- Water Flat water
- Best months Apr–Oct
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About this spot
The Bostalsee in the northern Saarland is the largest leisure lake in southwest Germany. It sits on a plateau between gentle hills, which gives the wind a clear run – southerly to westerly directions come through especially steadily. The main spot is in the bay at Gonnesweiler on the northeastern shore, where the schools and rental are based. You rig on the shore and ride on flat, tide-free freshwater.
Who is the lake for? Mainly beginner windsurfers, wingfoilers and SUP fans, though the plateau location can serve up demanding, gusty conditions for experienced surfers too. The season runs from April to October, with thermal help on summer afternoons. Kitesurfing is not permitted on the Bostalsee – it's a windsurf, wingfoil and SUP venue only.
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Location
Wind & weather through the year
According to model data for 2021–2025, January is the windiest month: on 21 % of days the wind blows at 12 knots or more from a direction that works at this spot for at least three daytime hours. It then mostly blows from the south-west. The most reliable period runs from January to February. The least wind is in June (7 %). In the warmer season (water from 15 °C), July brings the most wind days (12 %).
| Month | Wind days ≥ 12 kn | Avg wind | Direction | Air |
|---|---|---|---|---|
| January |
21 %
| 8 kn | SW | 2 °C |
| February |
19 %
| 8 kn | SW | 5 °C |
| March |
14 %
| 7 kn | SW | 8 °C |
| April |
12 %
| 8 kn | SW | 10 °C |
| May |
9 %
| 7 kn | SW | 15 °C |
| June |
7 %
| 6 kn | SW | 21 °C |
| July |
12 %
| 7 kn | SW | 21 °C |
| August |
7 %
| 6 kn | SW | 21 °C |
| September |
7 %
| 7 kn | SW | 17 °C |
| October |
12 %
| 7 kn | SW | 13 °C |
| November |
11 %
| 7 kn | SW | 6 °C |
| December |
14 %
| 8 kn | SW | 3 °C |
Wind day = at least 3 hours at ≥ 12 kn in daylight (09:00–19:00 local time). Only hours with wind from W, SW (usable according to the spot info) are counted. Model data (ECMWF IFS, approx. 9 km grid) – local venturi and thermal effects can be stronger. Weather data: Open-Meteo.com (CC BY 4.0)
Insider tips
Kitesurfing is not permitted on the Bostalsee. Main spot and schools are in the bay at Gonnesweiler on the northeastern shore; south to west winds work best.
⚠︎ Hazards
The plateau makes the wind gusty – allow a safety margin when gusts build. Deep, cool freshwater; in offshore wind mind your distance to shore.
All information without guarantee. Please check locally whether kiting, windsurfing, winging or surfing is currently allowed here – protected areas, swimming zones and seasonal closures change. You go on the water at your own risk.
Trips & camps
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Frequently asked questions
Is Bostalsee suitable for beginners?
Yes. According to the spot info, Bostalsee suits these levels: Beginner · Intermediate (water: Flat water).
Which wind works at Bostalsee?
Best with wind from W, SW. In the windiest month (January), model data show the wind mostly blowing from the south-west.
When is the best time for Bostalsee?
The best months are considered to be Apr–Oct. According to the wind statistics, July has the most wind days in the warmer season (water from 15 °C, 12 %); overall January is the windiest (21 %), but the water is cold then.
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