Last updated: August 27, 2025
In January, Haarlem, Netherlands experiences a cool maritime climate, with temperatures ranging from a chilly -4°C (26°F) at night to a modest 12°C (55°F) during the day. The average temperature sits at around 5°C (42°F), providing a brisk but invigorating atmosphere. This month also sees 62 mm (2.4 in) of precipitation spread over 13 days, contributing to a relatively high humidity level of 87%. Visitors are advised to embrace the Dutch winter charm, as Haarlem transforms into a picturesque landscape, perfect for exploring its historic sites amid the seasonal weather.
In Haarlem, Netherlands, January brings a chill as temperatures fluctuate between a frigid -4°C (26°F) at their lowest and a milder 12°C (55°F) at their peak, resulting in an average of 5°C (42°F). This month sets the tone for winter, with the thermometers dipping even lower in February, where the minimum can reach -7°C (19°F). As the seasons transition into spring, temperatures gradually rise, showcasing a noticeable trend: by March, averages leap to 7°C (44°F), hinting at the budding warmth ahead. The shift continues through April and May, where daytime highs soar significantly, reaching a balmy 25°C (77°F) by late April and 27°C (81°F) in May. Overall, January's chill is a distant memory as Haarlem moves steadily toward the more temperate and vibrant spring months.
In January, Haarlem experiences a moderate precipitation of 62 mm (2.4 in), spread over approximately 13 days of the month. This sets the stage for a wet winter, with precipitation levels gradually increasing into February and March, where the month averages rise to about 71 mm (2.8 in). Notably, January's rainfall may hint at the transition to the wetter months ahead, as the city braces for a significant spike in precipitation during the summer. Interestingly, these early months display a trend of consistent dampness, but the average rainy days remain relatively stable, suggesting that while January is wet, it doesn’t overpower the approaching months’ moisture levels. As winter yields to spring, the pattern shifts, revealing a dynamic climate that prepares Haarlem for the lush growth following its vibrant, albeit damp, January.
In January, Haarlem experiences a high humidity level of 87%, consistent with the preceding and following month of February, which also holds steady at 87%. This trend of elevated humidity persists into late autumn and winter months, with November and October reflecting similar levels. As the seasons transition, humidity gradually decreases, reaching 84% by May and dropping further to 78% in the height of summer, specifically in August. Interestingly, from there, it rebounds slightly in the early fall, climbing back to 83% in September. Overall, Haarlem's humidity showcases a distinct seasonal rhythm, peaking in the winter months and tapering off during the warmer summer season, creating a captivating interplay between temperature and moisture throughout the year.
In Haarlem, the UV Index in January stands at a mild 1, indicating a low exposure category where the risk of harm from unprotected sun exposure is minimal. This low index persists into February, maintaining the same rating and a burn time of 45 minutes. As spring approaches, the UV Index begins to climb; by March, it reaches 4, shifting to a moderate category with a reduced burn time of 30 minutes. April continues this upward trend with an Index of 5, signaling that it's time to start thinking more seriously about sun protection. The summer months see a marked increase, peaking in June and July with a very high Index of 8, where burn time dramatically drops to just 15 minutes. This trend highlights the importance of sun safety as Haarlem transitions from the lower exposure of winter to the intense sun of summer. As the year progresses into autumn and winter again, the UV Index decreases, landing back at 1 by December, where vigilance about sun exposure can relax once more. For more detailed information on UV levels throughout the year, visit Haarlem UV Index.
UV Risk Categories
January in Haarlem, Netherlands, ushers in a modest 114 hours of sunshine, setting the tone for a gradual increase in brightness as the year progresses. Following this, February experiences a significant boost with 199 hours, hinting at the approaching spring. By March, the sunshine peaks to 283 hours, as the days become longer and more vibrant. April and May continue this upward trajectory, delivering 361 and 412 hours, respectively, which showcases the city's transformation into a sun-kissed haven. However, the intensity reaches its zenith in July with 423 hours, before gently tapering off in the late summer months. As autumn unfolds, the sunshine diminishes, with October seeing 239 hours and November dropping to 193 hours. The year concludes with a reflective 133 hours in December, reminding us of the cycle of light and warmth that characterizes Haarlem’s seasons. Each month paints a vivid picture of sunshine's ebb and flow, reflecting not just the passage of time but the city’s embrace of the changing climate.
In Haarlem, Netherlands, the chance of experiencing sunny weather in January hovers around a modest 20%, marking the coldest month of the year where sunshine tends to be scarce. As winter gives way to spring, the likelihood of sunny days begins to rise steadily, with February seeing a slight increase to 27%. By the time March rolls in, the sunshine probability jumps to 34%, illustrating a pleasant upward trend that continues through the months. April brings a promising 41%, as daylight begins to lengthen, paving the way for the delightful sunny days of late spring and summer. Thus, while January might be draped in grey clouds, hope glimmers on the horizon, heralding warmer and sunnier days ahead!
In Haarlem, Netherlands, the daylight duration gradually increases as the year unfolds, starting with a modest 8 hours in January. This signals the slow return of light, as February brings a boost to 9 hours. By March, daylight increases further to 11 hours, heralding the approach of spring. The lengthening days continue into April with 13 hours and reach a bright 15 hours by May. The pinnacle of summer is evident in June and July, when daylight stretches to a robust 16 hours, providing ample time for outdoor activities. As autumn sets in, the daylight begins to wane, tapering to 14 hours in August and down to 12 hours by September. The decline continues through October into November, where daylight drops back to 8 hours, before concluding with a brief 7 hours in December. This cyclical pattern of daylight not only marks the changing seasons but also invites residents and visitors alike to engage with the beautiful transitions throughout the year.
In Haarlem, the January winds usher in a brisk start to the year, with an average speed of 5.8 m/s (13 mph) that remains consistent through February. As spring approaches, the winds begin to mellow slightly, dipping to 5.6 m/s (12 mph) in March and continuing a gentle decline to 5.3 m/s (12 mph) by April. This trend of decreasing wind speed continues into May, reaching its calmest in June at 3.9 m/s (9 mph), before the summer months bring a slight increase. Interestingly, October marks a return to stronger gusts, peaking at 6.2 m/s (14 mph), showcasing the dynamic nature of Haarlem's winds throughout the year. Overall, the wind patterns reflect a seasonal rhythm, with the early months invigoratingly breezy, transitioning through a serene summer, and escalating once more as autumn arrives.
Weather in Haarlem varies notably across the year, with each month offering distinct climate conditions. This page compares January’s weather to other months in Haarlem, focusing on differences in temperature, rainfall, humidity, and UV levels.
January typically has milder temperatures compared to February, with average highs reaching 12°C (55°F) versus February's peak of 16°C (61°F). However, February starts off chillier, experiencing a minimum temperature of -7°C (19°F), compared to January's low of -4°C (26°F). Precipitation is slightly higher in February, accumulating 71 mm (2.8 in) over 12 days, while January experiences 62 mm (2.4 in) of rain across 13 days. Both months maintain a consistent humidity level of 87%. For a closer look at February weather specifics, you can visit Haarlem weather in February.
In January, the weather in Haarlem is characterized by lower temperatures, with an average of 5°C (42°F) and a minimum dropping to -4°C (26°F). This month sees around 62 mm (2.4 in) of precipitation over approximately 13 days, accompanied by high humidity at 87%. In contrast, March brings gradually rising temperatures, with an average of 7°C (44°F) and a minimum of -7°C (19°F), peaking at 17°C (63°F). Although March has slightly more precipitation at 71 mm (2.8 in) over about 14 days, the humidity remains relatively consistent at 86%. For more details on the weather in March, you can visit Haarlem weather in March.
January weather in Haarlem is notably colder, with average temperatures ranging from a frigid -4°C (26°F) to a maximum of 12°C (55°F). The month experiences significant precipitation, totaling 62 mm (2.4 in) over approximately 13 days, and maintains a high humidity level of 87%. In contrast, April brings a much milder climate, with temperatures climbing from a minimum of 1°C (34°F) to a pleasant high of 25°C (77°F). Precipitation decreases to 43 mm (1.7 in) spread over 10 days, and humidity slightly drops to 85%. For a more detailed look at what to expect, check out Haarlem weather in April.
In January, the weather is quite chilly, with temperatures ranging from a minimum of -4°C (26°F) to a maximum of 12°C (55°F), and an average temperature of 5°C (42°F). During this month, Haarlem experiences significant precipitation, with 62 mm (2.4 in) spread over 13 days and high humidity levels at 87%. In stark contrast, May brings much warmer weather, with temperatures varying from a minimum of 4°C (40°F) to a pleasant maximum of 27°C (81°F), and an average temperature of 12°C (55°F). Precipitation in May is slightly lower at 54 mm (2.1 in), occurring on 11 days, accompanied by a marginally lower humidity of 84%. For those looking to learn more about Haarlem's climate during May, consider checking out Haarlem weather in May.
January and June present a striking contrast in weather. In January, temperatures range from a chilly -4°C (26°F) to a mild 12°C (55°F), with an average of 5°C (42°F). The month is characterized by high humidity at 87% and approximately 62 mm (2.4 in) of precipitation over 13 days. In contrast, June enjoys much warmer temperatures, with a minimum of 9°C (48°F) and a maximum of 30°C (86°F), averaging around 17°C (62°F). While June experiences slightly more precipitation at 74 mm (2.9 in) over 11 days, the humidity is lower at 81%. For a closer look at the weather during this vibrant month, check out Haarlem weather in June.
January and July present a striking contrast in weather. In January, temperatures typically range from a chilling minimum of -4°C (26°F) to a mild average of 5°C (42°F), peaking at 12°C (55°F). The month is quite damp, with 62 mm (2.4 in) of precipitation spread over about 13 days and high humidity levels at 87%. Conversely, July boasts much warmer conditions, with temperatures starting at a minimum of 11°C (52°F), an average of 18°C (64°F), and soaring to a maximum of 33°C (92°F). The summer month sees slightly more rainfall, with 73 mm (2.9 in) across around 14 days and a lower humidity of 80%. For more details on July weather, visit Haarlem weather in July.
In January, the weather is cold and crisp, with temperatures ranging from a chilly -4°C (26°F) to a comfortable maximum of 12°C (55°F). The month sees around 62 mm (2.4 in) of precipitation over approximately 13 days, coupled with a high humidity level of 87%, making the air feel damp and chilly. In contrast, August brings a significant warm-up, with temperatures fluctuating between a minimum of 11°C (52°F) and a peak of 30°C (87°F). With an average temperature of 18°C (65°F), it creates a more pleasant atmosphere, despite slightly higher precipitation of 99 mm (3.9 in) over 15 days and a lower humidity of 78%. For more details about weather specifics in August, you can check out Haarlem weather in August.
In January, the weather is quite chilly, with average temperatures hovering around 5°C (42°F), dipping as low as -4°C (26°F) at night. The month sees a fair amount of precipitation, amounting to 62 mm (2.4 in) over 13 days, and features a high humidity level of 87%. In contrast, September experiences much milder weather, with average temperatures reaching 16°C (60°F) and maximums peaking at 27°C (81°F). While September has slightly higher total precipitation at 93 mm (3.7 in) over 12 days, the humidity remains relatively lower at 83%. For detailed information on the weather patterns during this month, you can check Haarlem weather in September.
January and October present strikingly different weather patterns. January typically features colder temperatures, with a minimum of -4°C (26°F) and an average of 5°C (42°F), while October enjoys milder conditions, starting at a minimum of 4°C (40°F) and averaging around 13°C (55°F). Precipitation is notably higher in October, with 115 mm (4.5 in) falling over 17 days, compared to January's 62 mm (2.4 in) over 13 days. Despite the increased rainfall in October, humidity levels remain quite similar, at 86% in October and 87% in January. For a closer look at October's weather specifics, you can visit Haarlem weather in October.
January and November present distinct weather patterns. In January, temperatures range from a chilly -4°C (26°F) to a mild 12°C (55°F), with an average of 5°C (42°F). The month receives 62 mm (2.4 in) of precipitation over approximately 13 days, maintaining a high humidity level of 87%. In contrast, November sees slightly warmer conditions, with temperatures ranging from 0°C (33°F) to 17°C (63°F) and an average of 9°C (48°F). It receives slightly more precipitation at 65 mm (2.6 in) over around 15 days, but the humidity remains constant at 87%. For more details on November weather, you can visit Haarlem weather in November.
In comparing January and December weather, January tends to be slightly colder, with average temperatures ranging from a minimum of -4°C (26°F) to a maximum of 12°C (55°F), while December has a minimum of -3°C (27°F) and a maximum of 13°C (55°F), resulting in a slightly higher average temperature of 6°C (44°F) during the latter month. Precipitation levels are also noteworthy, as January sees about 62 mm (2.4 in) over 13 days, compared to December's 105 mm (4.1 in) across 18 days, indicating that December is much wetter. Both months experience high humidity, but January is marginally higher at 87%, compared to December's 86%. For more detailed information on December weather, you can check Haarlem weather in December.
As January settles in Haarlem, the weather takes on a distinctly chilly character that sets it apart from the milder months. With an average temperature lingering around a sharp 5°C (42°F) and frequent dips to below freezing at night, the crisp air calls for extra layers and warm beverages. While precipitation is common, with about 13 rainy days contributing to a total of 62 mm (2.4 in), the high humidity level of 87% can make the cold feel even more penetrating. This wintry chill contrasts significantly with the milder and occasionally sunny spells of spring and summer. For a deeper understanding of Haarlem's weather patterns throughout the year, check out Haarlem Climate.