When to Visit Belgium

Belgium in January is a study in grey. Highs reach only about 6°C (42°F) with lows around 1°C (34°F). With 13 rainy days and humidity sitting at 86 percent, the dampness gets into everything. UV peaks at just 1. Daylight feels thin and fleeting. That said, the post-holiday quiet makes this an excellent month for unhurried museum visits in Brussels and Antwerp. The winter sales across Belgium's shopping districts are in full swing.

Marginally drier than January with about 66 mm of rain and 12 rainy days, February still feels firmly wintery at highs of 7°C (44°F) and lows of 1°C (34°F). Humidity eases slightly to 84 percent but you would be hard pressed to notice. UV remains at 1. Carnival season hits parts of Wallonia. Binche's famous carnival usually falls in late February or early March. It brings welcome colour to an otherwise muted month.

The first hints of spring arrive as highs climb to 10°C (51°F) and lows to 3°C (38°F). Rainfall drops to about 58 mm across 11 rainy days. Humidity falls to 77 percent, which feels like a meaningful change after the winter saturation. UV rises to 3. The extra daylight is noticeable. Daffodils begin appearing in parks like the Hallerbos outside Brussels. Outdoor cafe terraces in Ghent and Leuven start setting out chairs on the warmer afternoons.

This is arguably Belgium's most pleasant transitional month. Highs reach 15°C (59°F) with lows of 6°C (42°F). April is the driest month of the year at just 46 mm of rainfall across 9 rainy days. Humidity drops to 69 percent and UV reaches 4. The Hallerbos bluebell bloom typically peaks in mid to late April and draws visitors from across Europe. Brussels and Bruges feel alive again without the summer density.

Temperatures push to 18°C (65°F) for highs and 9°C (48°F) for lows. Belgium begins to feel properly warm on sunny days. Rainfall ticks back up to 61 mm over 10 rainy days, though showers tend to be brief. Humidity sits at 71 percent and UV reaches 6, strong enough to warrant sunscreen on exposed skin. The Procession of the Holy Blood in Bruges falls on Ascension Day. Terrace culture across Flanders hits its stride. This is when you start seeing the country at its liveliest.

Summer arrives with highs of 21°C (70°F) and lows of 12°C (53°F). Rainfall is moderate at 71 mm across 10 rainy days, often arriving as afternoon thunderstorms that break the warmth. Humidity holds at 71 percent and UV peaks at 7, the highest of the year. Sun protection matters. Long evenings make this a superb month for exploring Antwerp's fashion district, cycling the Flanders countryside, or catching one of Belgium's many summer music festivals.

The warmest month, with highs reaching 23°C (73°F) and lows of 14°C (57°F). Those temperatures might sound modest by southern European standards. But combined with 71 percent humidity, a sunny July day in Brussels has real warmth to it. Expect about 76 mm of rain over 11 days and a UV index of 6. The Belgian coast fills up. Ghent holds its ten-day Gentse Feesten street festival. The Ardennes draws hikers and kayakers to the Ourthe and Semois valleys.

Statistically tied with July for warmth at 23°C (73°F) highs and 13°C (57°F) lows, August is the wettest month of the year at 86 mm across 11 rainy days, a fact that catches many visitors off guard. Humidity dips to 69 percent, the lowest summer reading, and UV holds at 6. The Tomorrowland festival near Boom and the Carpet of Flowers on the Grand Place in Brussels, held in even-numbered years, define the month for many visitors. Late August begins to feel like the season is turning.

A graceful transition month with highs of 19°C (67°F) and lows of 11°C (52°F). Rainfall settles to about 66 mm over 10 rainy days and humidity climbs back to 76 percent. UV drops to 4. The light in Belgium in September has a quality that photographers love, softer and more golden than the flat brightness of midsummer. Brussels Design September and the heritage open-door weekends give you access to buildings normally closed. September is underrated. Come then.

Autumn announces itself clearly as highs fall to 14°C (58°F) and lows to 8°C (46°F). Rain increases to 69 mm across 11 days and humidity rises to 83 percent. UV drops to 2. The Ardennes puts on its best autumn colour through the first three weeks, around the Ourthe valley and the forests near La Roche-en-Ardenne. In the cities, the cultural season picks up with theatre and concert programmes launching. Evenings start to feel short.

Winter's advance guard. Highs of only 9°C (49°F) and lows of 4°C (40°F), with 76 mm of rain across 12 days and humidity at 87 percent. UV drops back to 1. The greyness is real. This is the month when Belgium's indoor pleasures, its Trappist beer bars, its chocolate ateliers, its excellent restaurant scene in Brussels and Ghent, come into their own. Early Christmas markets begin appearing toward month's end in cities like Bruges and Liège.

The coldest alongside January, with highs of 6°C (43°F) and lows of 2°C (35°F). December is tied with August as the wettest month at 86 mm, and with 15 rainy days it is the most frequently wet month of the year. Humidity peaks at 88 percent and UV sits at 1. The Christmas markets in Brussels, Bruges, and Liège are the draw here, with the Brussels Winter Wonders market transforming the city centre. The festive atmosphere is genuine. Belgium does winter warmth indoors better than almost anywhere.