Sonian Forest

Forest · Brussels, 🇧🇪 Belgium

Area 41 km²

Time zone Europe/Brussels

Official website www.foret-de-soignes.be

Sonian Forest

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Sonian Forest: The Absolute Essentials

The Sonian Forest, a UNESCO World Heritage site, spans over 4,000 hectares across the Brussels-Capital, Flemish, and Walloon regions. This ancient beech forest features historic landmarks like the 14th-century Rouge Cloître priory and the Château of Val-Duchesse. Visitors can explore the Domaine Solvay in La Hulpe, which houses the Fondation Folon museum, or visit the circular Glaverbel Building and the former Boitsfort racecourse. Accessible via the Groenendaal and Hoeilaart train stations, the area offers a network of trails connecting historic chapels, castles, and serene parklands.

Sonian Forest — Map

Sonian Forest — Map

Climate & when to visit

Best time to visit: June, July, August, September

Select a month

Typical weather in January

Poor

6° (feels like 1°) · extremes -7°–11°
1° at night
14 rainy days
3 sunny days
Dry air
Light breeze

Typical weather in February

Poor

7° (feels like 2°) · extremes -6°–12°
1° at night
11 rainy days
4 sunny days
Dry air
Light breeze

Typical weather in March

Poor

10° (feels like 7°) · extremes -3°–16°
3° at night
14 rainy days
4 sunny days
Dry air
Light breeze

Typical weather in April

Fair

14° (feels like 11°) · extremes 0°–20°
5° at night
13 rainy days
4 sunny days
Dry air
Light breeze

Typical weather in May

Good

17° (feels like 16°) · extremes 3°–24°
9° at night
14 rainy days
5 sunny days
Dry air
Light breeze

Typical weather in June

Great

21° (feels like 20°) · extremes 7°–28°
12° at night
11 rainy days
6 sunny days
Dry air
Light breeze

Typical weather in July

Great

22° · extremes 10°–28°
14° at night
13 rainy days
6 sunny days
Dry air
Light breeze

Typical weather in August

Great

22° · extremes 10°–28°
14° at night
10 rainy days
8 sunny days
Comfortable humidity
Light breeze

Typical weather in September

Great

20° · extremes 8°–27°
12° at night
10 rainy days
7 sunny days
Dry air
Light breeze

Typical weather in October

Fair

15° (feels like 13°) · extremes 2°–21°
9° at night
12 rainy days
5 sunny days
Dry air
Light breeze

Typical weather in November

Poor

9° (feels like 5°) · extremes -3°–15°
4° at night
13 rainy days
4 sunny days
Dry air
Light breeze

Typical weather in December

Poor

6° (feels like 2°) · extremes -8°–12°
2° at night
13 rainy days
3 sunny days
Dry air
Light breeze

Climate data: Open-Meteo Climate API (EC_Earth3P_HR) · 1991–2020

Practical information

Currency: Euro EUR € · Card payments · Widely accepted
Emergency numbers: 112
Electricity: Type C / Type E
230 V · 50 Hz

Languages: Dutch, French, German
Tap water: Safe to drink
Driving side: Right
Calling code: +32

Tours & Activities

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