Last updated: August 21, 2025
In Zaventem, Belgium, January showcases a refreshing winter climate, with temperatures ranging from a brisk -6°C (21°F) to a maximum of 14°C (58°F). On average, residents and visitors can expect the mercury to hover around 4°C (40°F), offering a chilly but invigorating atmosphere. This month features 62 mm (2.4 in) of precipitation spread over 11 days, contributing to a notably hum humid environment with levels reaching up to 91%. Whether wrapped in cozy layers or enjoying seasonal festivities, Zaventem's January weather presents a unique blend of winter charm and refreshing coolness.
In Zaventem, Belgium, January offers a chilly embrace as winter deepens, with temperatures dipping as low as -6°C (21°F) at night and peaking around 14°C (58°F) during the day. This month marks a gradual transition towards milder days, as the average temperature climbs to a comfortable 4°C (40°F), hinting at the eventual arrival of spring. Notably, as we move into February, the cold intensifies slightly, but the maximum temperatures begin to rise, reflecting the seasonal shift. January’s temperature range showcases the stark contrasts of winter, while also laying the groundwork for warmer months ahead, as seen in March, when averages will climb further.
In Zaventem, Belgium, January marks the beginning of the year with a total precipitation of 62 mm (2.4 in) spread across 11 days. This early winter month sees a steady flow of moisture, setting the stage for the wetter weeks ahead. As winter transitions into spring, February's precipitation slightly increases to 67 mm and February continues to have similar rain patterns, averaging around 12 days of rainfall. Interestingly, while January showcases a moderate amount of rain, it is in the following months—particularly October and December—that Zaventem experiences the heaviest precipitation, peaking at 88 mm in December. This gradual rise in precipitation culminates in a wetter autumn and winter, creating a consistent trend of increased rainfall as the seasons shift. Such patterns not only highlight the moderate climate of Zaventem but also emphasize the importance of preparing for the stormy months that lie ahead.
In January, Zaventem experiences a high humidity level of 91%, setting the tone for a winter characterized by moist air. This pattern continues into February with only a slight drop to 89%. As spring approaches in March and April, humidity gradually decreases, reaching 85% by April. However, this decline is short-lived as the warmer months evoke a modest increase in humidity, stabilizing around 82% in both May and June. By July and August, humidity dips further to 80% and 76%, respectively, offering a reprieve from the cold. The trend shifts again in the fall, as September sees humidity climb back to 82%, climbing further to 89% in October. The year wraps up with November and December returning to the higher humidity levels of 92%, enveloping Zaventem in a familiar winter dampness. Overall, January's humidity serves as a precursor to the seasonal fluctuations that characterize the region throughout the year.
In January, Zaventem experiences a UV Index of 1, indicating low exposure and safe outdoor activities with a burn time of about 45 minutes. This trend of low UV levels continues through February, where the index only rises to 2, maintaining the same safe burn time. As spring approaches, the UV Index increases significantly, reaching 4 in March and 5 in April, marking the shift to moderate exposure with burn times dropping to just 30 minutes. By May, the index escalates to 7, categorized as high exposure, reducing sun-safe time to 25 minutes. The summer months of June and July see the peak at a very high 8, necessitating careful sun protection as burn time diminishes to only 15 minutes. As the seasons transition again, August sees a slight dip to 7, followed by a return to moderate levels in September and October at 5 and 3 respectively. The year rounds out with a return to lower UV values in November and December, both at 1 and 2, allowing for extended periods of safe sun exposure. To learn more about specific UV conditions throughout the year, visit Zaventem UV Index.
UV Risk Categories
In Zaventem, Belgium, the sun shines its brightest as the year progresses, starting with a modest 120 hours in January. As winter gives way to spring, sunshine increases significantly, peaking at 397 hours in May, a clear indication of the burgeoning warmth. June and July continue this trend, with daylight reaching its zenith at 411 hours in the heart of summer. As the year transitions into autumn, however, sunlight begins to wane, dropping to 320 hours in September and further diminishing to just 143 hours by December. This gradual cycle not only enhances the beauty of the seasons but also sets the stage for a vibrant summer, making Zaventem truly come alive under the sun's embrace.
In Zaventem, Belgium, January sees only a 10% chance of sunny weather, making it one of the driest months in terms of sunlight. As the year progresses, the likelihood of clear skies gradually increases, with February rising to 31% and March boasting a 39% chance of sunshine. This trend continues into the spring, reaching a peak of 47% in April before tapering off slightly in May and June, where sunny days remain around 33% to 34%. The summer months retain a similar likelihood, with chances hovering around 31% to 34%, while autumn brings a dip, particularly in November and December. Thus, if you're dreaming of sunshine in Zaventem, you may want to wait until spring to bask in its warm glow!
In Zaventem, Belgium, January heralds the year with 8 hours of daylight, marking a time when the crisp winter days gradually give way to more light. As the month progresses toward February, daylight increases to 10 hours, indicating the gentle transition towards spring. This upward trend continues into March with 11 hours, and by April, the sun shines for a delightful 13 hours, showcasing the awakening of nature. The brightness reaches its peak in June, offering an impressive 16 hours of daylight, perfect for enjoying outdoor activities. However, as summer wanes, daylight begins to taper off, descending to 15 hours in July and 14 hours in August. The tail end of summer leads into September with 12 hours, and as the days grow shorter, October provides 10 hours of light. November and December witness a return to the winter months, finishing the year with just 8 hours and 7 hours of daylight, respectively. This cyclical dance of light, from the depths of winter to the peak of summer, beautifully illustrates the rhythm of seasons in this charming Belgian locale.
In Zaventem, Belgium, the January wind sets the tone for the year, with an average wind speed of 4.2 m/s (9 mph). This brisk start slightly dips in February, reaching 4.3 m/s (10 mph), before gradually declining through the spring months to a gentle 3.3 m/s (7 mph) by April. As summer approaches, the winds calm even further, with June recording the lightest breezes at 2.7 m/s (6 mph). However, by October, the winds pick up again to a refreshing 4.1 m/s (9 mph), hinting at a return to more spirited conditions as the year closes with a modest 3.9 m/s (9 mph) in December. Overall, January's winds are part of a dynamic pattern, showcasing a notable decrease through spring and summer, followed by a revival in fall, accentuating the shifting seasonal character of this charming Belgian locale.
Weather in Zaventem varies notably across the year, with each month offering distinct climate conditions. This page compares January’s weather to other months in Zaventem, focusing on differences in temperature, rainfall, humidity, and UV levels.
January and February present notable differences in weather patterns. January features slightly milder average temperatures, ranging from a minimum of -6°C (21°F) to a maximum of 14°C (58°F), while February experiences colder minimum temperatures of -9°C (16°F) but higher maximums, peaking at 19°C (66°F). Precipitation levels are similar, with January receiving 62 mm (2.4 in) over 11 days and February slightly higher at 67 mm (2.6 in) across 12 days. Additionally, humidity is fairly consistent, recorded at 91% in January compared to 89% in February. For more detailed insights into February's weather, visit Zaventem weather in February.
In January, temperatures in Zaventem typically range from a chilly -6°C (21°F) at night to a mild 14°C (58°F) during the day, with an average of 4°C (40°F). The month sees around 62 mm (2.4 in) of precipitation spread over 11 days and higher humidity levels at 91%. In contrast, March brings slightly cooler nights with a minimum of -7°C (19°F), but daytime temperatures can rise significantly, averaging 7°C (46°F) and peaking at 23°C (74°F). Although March experiences a bit more precipitation at 68 mm (2.7 in) over 13 days, the humidity remains lower at 87%. For more details on March weather in Zaventem, you can visit Zaventem weather in March.
January and April exhibit significant differences in weather conditions. In January, temperatures are much colder, with a minimum of -6°C (21°F) and an average of 4°C (40°F), while April sees a warmer minimum of -4°C (26°F) and an average temperature of 10°C (51°F). Additionally, April can reach a maximum temperature of 28°C (82°F), a stark contrast to January's maximum of 14°C (58°F). Precipitation is higher in January, with 62 mm (2.4 in) over 11 days, compared to April's 35 mm (1.4 in) spread over just 7 days, and humidity levels are slightly lower in April at 85% compared to January's 91%. For more details, you can check Zaventem weather in April.
January and May present stark contrasts in weather patterns. In January, temperatures range from a chilling minimum of -6°C (21°F) to a maximum of 14°C (58°F), with an average of around 4°C (40°F). The month also experiences relatively high humidity at 91% and sees 62 mm (2.4 in) of precipitation over 11 days. In contrast, May brings much milder conditions, with temperatures fluctuating between a minimum of 1°C (34°F) and a pleasant maximum of 32°C (89°F), and an average of 14°C (57°F). Despite a slightly lower overall precipitation of 57 mm (2.3 in) over 12 days, May enjoys significantly lower humidity at 82%. For more detailed information, check out Zaventem weather in May.
In January, the weather in Zaventem is characterized by colder temperatures, with a minimum of -6°C (21°F) and an average of 4°C (40°F), while it can reach a maximum of 14°C (58°F). This month also experiences high humidity at 91% and receives about 62 mm (2.4 in) of precipitation over 11 days. In contrast, June brings considerably warmer conditions, with temperatures ranging from a minimum of 8°C (46°F) to an average of 18°C (65°F) and a peak of 33°C (92°F). The humidity drops to 82%, and while precipitation slightly increases to 64 mm (2.5 in), it falls over just 9 days. For more insights into the June weather, you can visit Zaventem weather in June.
January and July present striking contrasts in weather conditions. In January, temperatures can dip as low as -6°C (21°F), while averaging around a chilly 4°C (40°F) and peaking at 14°C (58°F). The month experiences high humidity at 91% and receives about 62 mm (2.4 inches) of precipitation over 11 days. In contrast, July offers a significantly warmer climate, with minimum temperatures around 8°C (47°F) and maximums soaring to 39°C (103°F), resulting in an average of 19°C (67°F). Though July has slightly more precipitation at 71 mm (2.8 in) over just 10 days, the humidity drops to a more comfortable 80%. For a detailed overview, check out Zaventem weather in July.
January and August present striking contrasts in weather patterns. In January, temperatures range from a chilly -6°C (21°F) to a modest max of 14°C (58°F), accompanied by high humidity levels averaging 91%. This month experiences approximately 62 mm (2.4 in) of precipitation over 11 days, contributing to a damp and cold atmosphere. In stark contrast, August boasts a much warmer climate, with temperatures fluctuating between 8°C (47°F) and an inviting 36°C (96°F). The atmosphere is significantly drier, with 74 mm (2.9 in) of precipitation over 13 days and a humidity level of 76%. For more details on the weather during this summer month, check Zaventem weather in August.
January and September exhibit striking contrasts in weather. In January, temperatures can plummet to a chilling minimum of -6°C (21°F), with an average of 4°C (40°F) and a maximum reaching only 14°C (58°F). This month is characterized by high humidity at 91% and frequent precipitation, totaling 62 mm (2.4 in) over 11 days. In contrast, September boasts warmer conditions with a minimum temperature of 4°C (39°F), an average of 16°C (60°F), and highs soaring to 33°C (93°F). Additionally, precipitation decreases to 50 mm (2.0 in) over just 9 days, coupled with a lower humidity of 82%. For more detailed information, you can refer to Zaventem weather in September.
In January, temperatures can plunge as low as -6°C (21°F), with an average high of just 14°C (58°F), while October enjoys milder conditions, featuring a minimum temperature of 2°C (35°F) and a pleasant maximum of 26°C (79°F). January's chilly average of 4°C (40°F) contrasts sharply with October's average of 13°C (55°F). Additionally, January sees about 62 mm of precipitation over 11 days, whereas October experiences slightly more rain at 77 mm across 12 days, resulting in a slightly lower humidity of 89%. For more information, you can check out the detailed outlook for Zaventem weather in October.
In January, temperatures typically range from a chilly -6°C (21°F) at night to a milder 14°C (58°F) during the day, with an average of about 4°C (40°F). The month experiences around 62 mm (2.4 in) of precipitation over 11 days, accompanied by high humidity levels of 91%.
In contrast, November offers slightly warmer conditions, with nighttime lows around -3°C (28°F) and daytime highs reaching up to 19°C (66°F), resulting in an average temperature of 7°C (46°F). Precipitation is somewhat lighter, totaling 53 mm (2.1 in) over 10 rainy days, and the humidity remains slightly higher at 92%.
For more detailed information on November weather, you can check Zaventem weather in November.
In December, the weather typically features a slightly milder average temperature of 6°C (42°F) compared to January's average of 4°C (40°F). While January experiences minimum temperatures dropping to -6°C (21°F), December remains slightly warmer with a minimum of -5°C (23°F). Precipitation is more frequent in December, with rain on 16 days and a total of 88 mm (3.5 in), compared to January's 62 mm (2.4 in) over 11 days, indicating that December is generally wetter. Additionally, the humidity remains quite high in both months, with December at 92% and January at 91%. For more details on December weather, you can check Zaventem weather in December.
As you step into January in Zaventem, you'll quickly notice a distinctive chill that sets it apart from the milder months of the year. Temperatures often hover around a brisk average of 4°C (40°F), with occasional dips that remind you of winter's grip. While the maximum can reach a comfortable 14°C (58°F), it is the frequent frosts, with nights plunging to -6°C (21°F), that define this month. Additionally, January's high humidity at 91% often accompanies an average of 11 rainy days, making it a notably wet and damp time. For an in-depth look at how January's weather fits into Zaventem's overall climate, explore Zaventem Climate.