Brussels, where it lies

In Brussels, the capital city of Belgium, and seat of important European institutions, the climate is sub-oceanic, humid and rainy, influenced by the Atlantic Ocean, so it has cold (but not freezing) winters and quite cool summers.
The wind blows frequently, and can be intense, especially from November to March.
The average temperature ranges from 3.5 °C (38 °F) in January to 18.5 °C (65.5 °F) in July. Here are the average temperatures.
Brussels - Average temperatures
MonthJanFebMarAprMayJunJulAugSepOctNovDec
Min (°C)1135912141310842
Max (°C)671014182123232015106
Min (°F)343437414854575550463936
Max (°F)434550576470737368595043

Precipitation is relatively abundant, about 820 millimeters (32 inches) per year, but above all, it is common and well distributed over the seasons. However, the rainiest seasons are summer and autumn, and the least rainy season is spring. Rainfall often occurs as short shower or drizzle. Here is the average precipitation.
Brussels - Average precipitation
MonthJanFebMarAprMayJunJulAugSepOctNovDecYear
Prec.(mm)756070506570757570757580850
Prec.(in)32.42.822.62.8332.8333.133.5
Days131113101110101010111313136

Winter, from December to February, is cold: daytime temperatures are on average a few degrees above freezing (0 °C or 32 °F), while at night, they are around freezing; wind and humidity often exacerbate the feeling of cold.
However, different weather situations can occur.
When the westerlies blow, temperatures can be quite mild, and can reach 10/12 °C (50/54 °F), however, there may be wind and rain.
On the other hand, when the city is reached by cold air masses from Russia, the temperature drops below freezing, for longer or shorter periods, even during the day. The temperature rarely drops below -10 °C (14 °F), however, it can do it on colder periods. Here are some values recorded in the coldest winters: January 1985: -16 °C (3 °F); January 1987: -14 °C (7 °F); December 1996: -12 °C (10 °F); February 2012: -14 °C (7 °F).
Snowfalls in Brussels are quite frequent, though usually not abundant, and occur in the form of light snow, however, snow can sometimes accumulate on the ground, and last for many days, if it occurs during cold waves.

Spring, from March to May, is initially cold, with possible snowfalls still in March, and then it gradually becomes milder in April and May, although some cold days, with highs around 10 °C (50 °F), can occur even in May, especially in the first half of the month. However, April and May are, albeit slightly, the least rainy and cloudy months of the year.
Typically, by the second half of May, temperatures become permanently acceptable, and there can be the first pleasantly warm days, with highs around 25 °C (77 °F) or even above.

Summer, from June to August, is mild, and the flow of Atlantic fronts does not cease even in this season; the wind blows constantly from the sea, and rainfall is quite frequent as well. However, there are pleasant periods, with daytime temperatures between 20 °C and 25 °C (68 °F and 77 °F), but also cooler periods, with temperatures remaining below 20 °C (68 °F) even during the day. At night, it can be a bit cold, in fact, the temperature can drop below 10 °C (50 °F) even in July and August. Sometimes, there can be hot days, during which the temperature can reach 28/30 °C (82/86 °F), but this may not occur for a whole month. Here are some values reached in recent hot summers: August 2003, 35 °C (95 °F); August 2013, 34 °C (93 °F); July 2015, 34 °C (93 °F).

Autumn, from September to November, is initially pleasant, ie in the first half of September, then it gradually becomes more cold, dull, wet and windy. The first night frosts usually occur in November, but sometimes also in October.

Brussels

Brussels does not get a lot of sun, especially from November to February, when the sun rarely shines. It goes a bit better in spring and in summer, when the weather is variable, and between one disturbance and another, the sun can come out. There are on average about 6.5 hours of sunshine per day from May to August. Here are the average sunshine hours per day.
Brussels - Sunshine
MonthJanFebMarAprMayJunJulAugSepOctNovDec
Hours234666765422

Best Time


The best time to visit Brussels runs from mid-May to mid-September, since it is the mildest of the year. July and August are the warmest months. However, it's better to bring a sweatshirt or sweater, a light jacket and an umbrella, for cool and rainy days.