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Contents
- The climate of Herstal
- The best time to visit Herstal
- The worst time to visit Herstal
- Spring weather in Herstal
- Summer weather in Herstal
- Autumn weather in Herstal
- Winter weather in Herstal
- Weather in January
- Weather in February
- Weather in March
- Weather in April
- Weather in May
- Weather in June
- Weather in July
- Weather in August
- Weather in September
- Weather in October
- Weather in November
- Weather in December
- Frequently asked questions
- Average temperature
- Average pressure
- Average wind speed
- Average humidity
- Average rainfall
- Average rainfall days
- Average snowfall
- Average snowfall days
- Average daylight
- Average sunshine
- Average sunshine days
- Average UV index
- Average cloud cover
- Average visibility
Climate and monthly weather forecast
The climate of Herstal
Herstal, Belgium, is largely influenced by a Marine west coast climate, known as a Cfb type in the Köppen climate classification. This type of climate is characterized by mild temperatures throughout the year and rainfall in all months. With its geographical setting in the centre of Belgium, Herstal experiences a temperature range from a low of -0.3°C (31.5°F) in the coldest months to a pleasant high of 22.3°C (72.1°F) in the warmest months.
Humidity levels hover in the 70s and 80s percentile range throughout the year, with the highest relative humidity of 89% in December and the lowest of 77% seen in both April and August. Rainfall in Herstal is well-distributed throughout the year, ranging from 26mm (1.02") in April to 58mm (2.28") in December. The number of rainfall days also varies, with the most frequently occurring in July at 19.4 days and the fewest in February and October at 12.7 days.
Also to note is the occurrence of snowfall, predominantly seen in the winter months of January and December with 50mm (1.97") and 30mm (1.18") respectively and to some lesser extent in March with 12mm (0.47"). Herstal's broad daylight hours span from 8.1 hours in December to a peak of 16.4 hours in June. Lastly, wind speeds generally moderate with a maximum gust speed of 28.3km/h (17.6mph) in December and lightest observed winds in July at 10.7km/h (6.6mph).
Humidity levels hover in the 70s and 80s percentile range throughout the year, with the highest relative humidity of 89% in December and the lowest of 77% seen in both April and August. Rainfall in Herstal is well-distributed throughout the year, ranging from 26mm (1.02") in April to 58mm (2.28") in December. The number of rainfall days also varies, with the most frequently occurring in July at 19.4 days and the fewest in February and October at 12.7 days.
Also to note is the occurrence of snowfall, predominantly seen in the winter months of January and December with 50mm (1.97") and 30mm (1.18") respectively and to some lesser extent in March with 12mm (0.47"). Herstal's broad daylight hours span from 8.1 hours in December to a peak of 16.4 hours in June. Lastly, wind speeds generally moderate with a maximum gust speed of 28.3km/h (17.6mph) in December and lightest observed winds in July at 10.7km/h (6.6mph).
The best time to visit Herstal
The best time to visit Herstal largely depends on what kind of weather visitors prefer. For those desiring warm temperatures and clear skies, the summer months of June, July, and August are ideal. During this period, the temperature is at its highest, reaching up to 22.3°C (72.1°F), and there is an average of 9.2 hours of sunshine per day. This is also the time when the least amount of cloud cover is present in the area.
The worst time to visit Herstal
December proves to be the most challenging month to visit Herstal, primarily due to low temperatures, high relative humidity, and increased cloud cover. Despite its position as the month with the highest rainfall, it also sees a significant amount of snowfall. This combination of precipitation and low temperatures can result in frigid conditions. Furthermore, December has the shortest days, with an average of only 8.1 hours of daylight, and the lowest amount of sunshine clocking in at merely 3.6 hours per day.
Spring weather in Herstal
Spring in Herstal, covering March through May, becomes increasingly warmer with temperatures rising from 9.6°C (49.3°F) in March to a pleasant 16.7°C (62.1°F) in May. Rainfall is relatively moderate yet consistent through these months. While March starts with notable snowfall, it eventually tapers off, leaving the rest of the spring largely snow-free. Sunshine hours also see a steady increase, with 5.9 in March and gradually reaching 8.4 in May.
Summer weather in Herstal
Summer in Herstal spans from June to August, with temperatures peaking around 22.3°C (72.1°F). The season is characterized by the most amount of daylight peaking at 16.4 hours in June. Alongside, it is also the time of the year with the least amount of cloud cover, enabling visitors to enjoy the up to 9.2 hours of sunshine per day.
Autumn weather in Herstal
Autumn, transitioning from September through November, brings a progressive reduction in temperatures from 18.8°C (65.8°F) in September to 9.1°C (48.4°F) in November. As the season progresses, so does the increase in relative humidity, precipitation, and cloud cover. However, the month of November is noteworthy for having reduced sunlight hours, dropping down to just 4.1 hours per day on average, contrasting the 7.8 experienced at the start of the season.
Winter weather in Herstal
Winter in Herstal starts off in December with temperatures taking a dip down to 5.6°C (42.1°F) and eventually reaching the lowest at -0.3°C (31.5°F) in January. Precipitation during this season comes in different forms, both rain and snow, with notable snowfalls in January and December. Despite the chilly conditions, Herstal is subjected to high wind speeds, with a gust speed reaching up to 28.3km/h (17.6mph) in December. Unsurprisingly, sunshine hours are at their annual lowest and cloud cover at its peak during this season.
Weather in January
Shifts in the weather begin in Herstal, Belgium, with the arrival of January. The weather contrasts with December as there is a decrease in snowfall from 30mm (1.18") to 50mm (1.97") and one of the highest relative humidity averages for the year at 88%. Weather in January »
Weather in February
February continues this trend of cold temperatures and high humidity in Herstal. Compared to January, the amount of snowfall declines from 50mm (1.97") to 38mm (1.5"), but the lack of sunshine still remains the same. The breeze becomes perceptibly stronger this month, sweeping down alleyways and chilling to the bone. Weather in February »
Weather in March
When March arrives, Herstal starts to experience the first signs of spring. With the continued upsurge in temperatures from 5.2°C (41.4°F) to 9.6°C (49.3°F), the snowfall reduces drastically from 38mm (1.5") to 12mm (0.47"). Residents get to enjoy more sunshine and daylight as they look forward to the promise of warmer weather. Weather in March »
Weather in April
April brings a noticeable change in Herstal's weather with the arrival of warmer temperatures. This month sees a steady increase in temperatures, resulting in nearly no snowfall from an already declining 12mm (0.47") in March. The frequency of sunny days also increases, bathing the city with a gentle warmth, amplifying the city's charm. Weather in April »
Weather in May
May signifies the onset of the pre-summer season in Herstal with temperatures continuing to rise steadily. The warmer weather is clear with no snowfall compared to the marginal 1mm (0.04") seen in April. Daylight hours extend, creating longer days and adding to the growing sentiment of the imminent summer. Weather in May »
Weather in June
June ushers in the first signs of summer in Herstal as temperatures rise, and daylight hours reach their peak for the year. However, it also comes with the highest monthly rainfall of 53mm (2.09"), up from 46mm (1.81") in May. People engage in festive summer activities, making the most of warmer days and balmy evenings. Weather in June »
Weather in July
July stands out as the warmest month in Herstal, with average highs reaching 22.3°C (72.1°F), marking the pinnacle of summer. Despite the pleasant weather, the month also comes with a high amount of rainfall as it maintains the June level of 53mm (2.09"). Weather in July »
Weather in August
August continues the summer trend in Herstal, with high temperatures hovering around the July peak. Unwavering from July's weather pattern, the rainfall reaches 54mm (2.13"), the highest of the year. The promise of long sunny days continues to invite residents and tourists to enjoy the vibrant outdoors. Weather in August »
Weather in September
September brings a noticeable change in the weather as summer transitions into autumn in Herstal. Despite the temperatures dropping from 22.3°C (72.1°F) to 18.8°C (65.8°F), there is a significant reduction in rainfall from 54mm (2.13") to 35mm (1.38"). Weather in September »
Weather in October
October continues the autumnal trend in Herstal, with falling temperatures and a slight increase in the rainfall from 35mm (1.38") to 37mm (1.46"). The city continues to be bathed in warm tones of fall foliage, creating a breathtaking, panoramic vista. Weather in October »
Weather in November
November in Herstal introduces the first hints of winter as the temperatures continue to plummet. The city welcomes a slight increase in rainfall from 37mm (1.46") to 40mm (1.57") as the last vestiges of Autumn fade away. City dwellers begin the preparations for the holiday season, making the most out of the dwindling daylight hours. Weather in November »
Weather in December
December marks the advent of winter in Herstal with a notable drop in temperatures. The change from the previous month brings the first snowfall of the season, with a sudden increase from 4mm (0.16") to 30mm (1.18"). The city is adorned with twinkling lights and festive decorations as holiday cheer permeates the air. Weather in December »
Updated: Aug 6, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the coldest month?
Herstal's coldest weather arrives in January, when temperatures average a high of 4.1°C (39.4°F) and a low of -0.3°C (31.5°F).
How much does it rain?
Throughout the year, there are 193.2 rainfall days, and 544mm (21.42") of precipitation is accumulated.
When does it snow?
January through April, November and December are months with snowfall.
When does it snow the most?
The month with the most snowfall is January, when snow falls for 5.8 days and typically aggregates up to 50mm (1.97") of snow.
How much does it snow?
In Herstal, during the entire year, snow falls for 18.2 days and aggregates up to 135mm (5.31") of snow.
What is the month with the lowest UV index?
The months with the lowest UV index are January through March, November and December, with an average maximum UV index of 2.
What are the least humid months?
The months with the lowest humidity are April and August, with an average relative humidity of 77%.
What is the driest month?
The month with the least rainfall in Herstal is April, when the rain falls for 14.5 days and typically collects 26mm (1.02") of precipitation.
When it does not snow?
In Herstal, Belgium, snow does not fall in May through October.
When are the longest days?
The month with the longest days is June, with an average of 16h and 24min of daylight.
What are the months with the highest UV index?
June and July, with an average maximum UV index of 5, are months with the highest UV index.
What month is the hottest?
July and August, when the average high-temperature reaches 22.3°C (72.1°F), are the warmest months.
What are the months with the most sunshine?
July and August, with an average of 9.2h of sunshine, are months with the most sunshine.
When is Daylight Saving Time (DST)?
On Sunday, 27. October 2024, at 03:00, Daylight Saving Time ends, and the time zone changes from CEST to CET. The next Daylight Saving Time starts on Sunday, 30. March 2025, at 02:00, and the time zone reverts from CET to CEST.
What is the most humid month in Herstal?
The most humid month is December, with an average relative humidity of 89%.
What is the rainiest month?
The month with the most rainfall is December, when the rain falls for 17.3 days and typically aggregates up to 58mm (2.28") of precipitation.
What is the month with the shortest days?
With an average of 8h and 6min of daylight, December has the shortest days of the year.
What is the month with the least sunshine?
The month with the least sunshine is December, with an average of 3.6h of sunshine.
Average temperature
Herstal, Belgium
The warmest months (with the highest average high temperature) are July and August (22.3°C).
The month with the lowest average high temperature is January (4.1°C).
The month with the highest average low temperature is August (12.8°C).
The coldest month (with the lowest average low temperature) is January (-0.3°C).
Average pressure
Herstal, Belgium
- Average pressure in January:
1016.6mbar - Average pressure in February:
1015.6mbar - Average pressure in March:
1016.2mbar - Average pressure in April:
1015.7mbar - Average pressure in May:
1016.2mbar - Average pressure in June:
1016.1mbar
- Average pressure in July:
1015.6mbar - Average pressure in August:
1015.8mbar - Average pressure in September:
1017.5mbar - Average pressure in October:
1016.8mbar - Average pressure in November:
1013.1mbar - Average pressure in December:
1016.9mbar
The month with the highest atmospheric pressure is September (1017.5mbar).
The month with the lowest atmospheric pressure is November (1013.1mbar).
Average wind speed
Herstal, Belgium
- Average wind speed in January:
16.3km/h - Average wind speed in February:
16.7km/h - Average wind speed in March:
15km/h - Average wind speed in April:
11.9km/h - Average wind speed in May:
11.4km/h - Average wind speed in June:
11.1km/h
- Average wind speed in July:
10.7km/h - Average wind speed in August:
10.5km/h - Average wind speed in September:
10.9km/h - Average wind speed in October:
13km/h - Average wind speed in November:
14.8km/h - Average wind speed in December:
17km/h
The windiest month (with the highest average wind speed) is December (17km/h).
The calmest month (with the lowest average wind speed) is August (10.5km/h).
Average humidity
Herstal, Belgium
The month with the highest relative humidity is December (89%).
The months with the lowest relative humidity are April and August (77%).
Average rainfall
Herstal, Belgium
The wettest month (with the highest rainfall) is December (58mm).
The driest month (with the least rainfall) is April (26mm).
Average rainfall days
Herstal, Belgium
- Average rainfall days in January:
15.7 days - Average rainfall days in February:
12.7 days - Average rainfall days in March:
15.6 days - Average rainfall days in April:
14.5 days - Average rainfall days in May:
18.3 days - Average rainfall days in June:
18.8 days
- Average rainfall days in July:
19.4 days - Average rainfall days in August:
18.3 days - Average rainfall days in September:
13.5 days - Average rainfall days in October:
13.5 days - Average rainfall days in November:
15.6 days - Average rainfall days in December:
17.3 days
The month with the highest number of rainy days is July (19.4 days).
The month with the least rainy days is February (12.7 days).
Average snowfall
Herstal, Belgium
The month with the highest snowfall is January (50mm).
The months with the least snowfall are May, June, July, August, September and October (0mm).
Average snowfall days
Herstal, Belgium
- Average snowfall days in January:
5.8 days - Average snowfall days in February:
5 days - Average snowfall days in March:
1.8 days - Average snowfall days in April:
0.4 days - Average snowfall days in May:
0 days - Average snowfall days in June:
0 days
- Average snowfall days in July:
0 days - Average snowfall days in August:
0 days - Average snowfall days in September:
0 days - Average snowfall days in October:
0 days - Average snowfall days in November:
1.3 days - Average snowfall days in December:
3.9 days
The month with the highest number of snowfall days is January (5.8 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight / Average sunshine
Herstal, Belgium
- Average daylight in January:
8h and 4min - Average daylight in February:
10h and 1min - Average daylight in March:
11h and 5min - Average daylight in April:
13h and 5min - Average daylight in May:
15h and 3min - Average daylight in June:
16h and 2min
- Average daylight in July:
16h and 0min - Average daylight in August:
14h and 3min - Average daylight in September:
12h and 4min - Average daylight in October:
10h and 4min - Average daylight in November:
9h and 0min - Average daylight in December:
8h and 1min
The month with the longest days is June (Average daylight: 16h and 24min).
The month with the shortest days is December (Average daylight: 8h and 6min).
- Average sunshine in January:
3h and 5min - Average sunshine in February:
4h and 1min - Average sunshine in March:
5h and 5min - Average sunshine in April:
8h and 2min - Average sunshine in May:
8h and 2min - Average sunshine in June:
8h and 4min
- Average sunshine in July:
9h and 1min - Average sunshine in August:
9h and 1min - Average sunshine in September:
7h and 5min - Average sunshine in October:
5h and 4min - Average sunshine in November:
4h and 1min - Average sunshine in December:
3h and 4min
The months with the most sunshine are July and August (Average sunshine: 9h and 12min).
The month with the least sunshine is December (Average sunshine: 3h and 36min).
Average sunshine days
Herstal, Belgium
- Average sunshine days in January:
10.6 days - Average sunshine days in February:
10 days - Average sunshine days in March:
12.3 days - Average sunshine days in April:
12.1 days - Average sunshine days in May:
10.3 days - Average sunshine days in June:
8.3 days
- Average sunshine days in July:
8.8 days - Average sunshine days in August:
9.8 days - Average sunshine days in September:
13.8 days - Average sunshine days in October:
14.7 days - Average sunshine days in November:
10.8 days - Average sunshine days in December:
9.7 days
The month with the most sunshine days is October (14.7 days).
The month with the least sunshine days is June (8.3 days).
Average UV index
Herstal, Belgium
The months with the highest UV index are June and July (UV index 5).
The months with the lowest UV index are January, February, March, November and December (UV index 2).
Average cloud cover
Herstal, Belgium
The month with the most cloud cover is December (Cloud cover 63).
The month with the least cloud cover is August (Cloud cover 40).
Average visibility
Herstal, Belgium
The months with the highest visibility are March, April, May, June, July and August (9km).
The months with the lowest visibility are January, February, September, October, November and December (8km).
