Last updated: August 27, 2025
In January, Solothurn, Switzerland experiences a captivating winter landscape characterized by a diverse temperature range. Daily maximums can reach up to 16°C (61°F), while the average temperature hovers around 1°C (33°F), dipping to a chilly -13°C (9°F) at night. The month sees an average precipitation of 97 mm (3.8 in) spread over 13 days, contributing to the region's lush, wintery beauty. With humidity levels peaking at 91%, the air is crisp and invigorating, making it a mesmerizing time to explore the enchanting charm of Solothurn amidst its wintry backdrop.
In Solothurn, Switzerland, January is characterized by a wide temperature range, with nighttime lows plummeting to -13°C (9°F) and daytime highs reaching up to 16°C (61°F). The average temperature hovers around 1°C (33°F), signaling the chill of winter while hinting at the warmth to come in the following months. As January progresses into February, temperatures show a slight upward trend, with average highs nudging up to 18°C (64°F) by the end of the month. This transition marks the beginning of a gradual warming trend, leading into the more temperate spring months, highlighting the dynamic shifts that make Solothurn's climate both intriguing and varied.
In January, Solothurn, Switzerland experiences a notable precipitation amount of 97 mm (3.8 in), accompanied by 13 rainy days that set the tone for a wet winter. This level of precipitation aligns closely with March, while February sees a slight dip to 80 mm (3.1 in) over just 12 days, suggesting a brief respite before the spring rain begins in earnest. The trend of fluctuating precipitation continues throughout the year, with May emerging as the wettest month at 149 mm (5.9 in). Interestingly, summer months like July and August maintain high levels of moisture, often exceeding 140 mm. Thus, January serves as a precursor to Solothurn's rich tapestry of seasonal weather, characterized by its blend of rainy days and substantial precipitation.
In January, Solothurn experiences its peak humidity at an impressive 91%, setting the stage for the cold, damp conditions characteristic of winter. As the season progresses into February and March, humidity begins to slightly decline, hovering around 89% and 87% respectively. This gradual decrease continues through the spring, with April and May seeing humidity levels drop to 84% and 80%. However, the warmth of summer brings a subtle increase back to 82% in both June and July, while August enjoys a more comfortable 77%. As autumn approaches, humidity rises again, stabilizing around 81% in September before escalating to 89% in October and November. The year closes out where it began, with December returning to 91%, illustrating a clear pattern of humidity's cyclical nature in Solothurn throughout the seasons.
In January, Solothurn experiences a UV Index of 2, categorized as low, which means residents can safely enjoy outdoor activities with a burn time of around 45 minutes. As the months progress toward spring, the UV Index begins to climb, reaching 3 in February and then 5 in March, indicating a moderate exposure level. This trend continues, and by April, the index spikes to 6, entering the high category, warning sun seekers to take precautions as the burn time decreases to just 25 minutes. The summer months bring even higher levels of UV radiation, with the index peaking at 9 in both June and July—a culmination of the very high exposure category where the burn time diminishes to a mere 15 minutes. As summer gives way to autumn, the UV Index gradually falls, reaching 4 in October before dropping back to 2 by November, signifying a return to lower exposure levels. This seasonal fluctuation emphasizes the importance of UV protection, particularly in the sunnier months. For detailed UV insights throughout the year, visit Solothurn UV Index.
UV Risk Categories
January in Solothurn, Switzerland, brings about 161 hours of sunshine, marking the start of the year with a gentle light that gradually increases as winter gives way to spring. As February unfolds, bright days increase to 226 hours, hinting at the promise of warming weather. The sunshine continues to rise dramatically in March to 298 hours, paving the way for April's delightful 357 hours. The sun truly flourishes in the following months, peaking in July with a remarkable 417 hours, before the daylights gradually begin to wane. While August remains warm with 385 hours, a steady decrease follows, leading into the cooler months of autumn, where September has 325 hours and October drops to 282 hours. As the calendar turns to late fall and winter, sunshine decreases, leaving November with 224 hours and December with 185 hours, yet the returning light in January always sparks hope for brighter days ahead.
In Solothurn, Switzerland, the likelihood of enjoying sunny weather in January is relatively low, with only a 15% chance of sun gracing the skies. This wintry month stands in stark contrast to the warmer months ahead; as February rolls in, the sun's chances increase significantly to 36%, and by March, the likelihood further rises to 45%. This upward trend continues through spring, reaching nearly half-portion sunshine in April at 49%. Shortly thereafter, the percentage fluctuates in early summer, hovering around 31-38%, before ascending again into the fall. Thus, if you're seeking sunny days, it’s clear that waiting for spring is your best bet if you're in Solothurn!
In Solothurn, Switzerland, January brings approximately 8 hours of daylight, setting the stage for gradual lengthening as winter transitions into spring. By February, daylight increases to 10 hours, hinting at brighter days ahead. As March arrives, daylight reaches 11 hours, while April further embraces spring with a generous 13 hours of sunlight. This upward trend continues into May, capping daylight at 15 hours, which is echoed in June and July. As summer wanes, August sees a slight decrease to 14 hours, but the evenings remain fairly vibrant. The days start to shorten again in September, dropping to 12 hours, and continue their retreat through October and November, ending the year with 9 hours in November and a return to 8 hours in December. This cyclical pattern highlights the comforting rhythm of seasonal change in Solothurn, where each month offers a unique balance of light and darkness.
In January, Solothurn experiences a gentle breeze with an average wind speed of 2.5 m/s (6 mph), offering a refreshing start to the year. This slight uptick in wind speed compared to February’s 2.2 m/s (5 mph) marks a seasonal trend where the winter months typically exhibit milder winds. Throughout the spring, wind speeds remain relatively consistent, lingering around 2.3 m/s (5 mph), before rising to a pleasant 2.7 m/s (6 mph) in May, hinting at summer's imminent arrival. As the warm months unfold, however, the winds tend to calm down, with June through August averaging below 2 m/s (4 mph). Interestingly, the transition into autumn sees a slight resurgence, as November records a notable 2.1 m/s (5 mph). This cycle showcases how Solothurn's winds evolve with the seasons, oscillating between tranquil and invigorating, while setting the stage for the charm of each time of year.
Weather in Solothurn varies notably across the year, with each month offering distinct climate conditions. This page compares January’s weather to other months in Solothurn, focusing on differences in temperature, rainfall, humidity, and UV levels.
January and February in Solothurn present a gradual shift in weather conditions. January sees a wider temperature range with a minimum of -13°C (9°F), an average of 1°C (33°F), and a maximum of 16°C (61°F). The month experiences considerable precipitation at 97 mm (3.8 in) over 13 days, coupled with high humidity levels at 91%. In contrast, February brings somewhat milder temperatures, with a minimum of -11°C (13°F), an average of 3°C (38°F), and a maximum of 18°C (64°F). Precipitation decreases slightly to 80 mm (3.1 in) over 12 days, and humidity remains relatively high at 89%. For more detailed insights, you can check Solothurn weather in February.
January and March exhibit distinct differences in weather, despite both months experiencing the same minimum temperature of -13°C (9°F). January typically has harsher conditions, with an average temperature of 1°C (33°F) and a maximum of 16°C (61°F), combined with high humidity levels of 91%. In contrast, March sees a slight increase in the average temperature, rising to 6°C (42°F) and reaching a maximum of 21°C (69°F). Both months receive similar precipitation, totaling 97 mm (3.8 in), but March experiences slightly more rainy days, with precipitation recorded on 16 days compared to January's 13. For more detailed information about March weather in Solothurn, check out Solothurn weather in March.
January and April showcase striking differences in weather patterns. January's temperatures range from a chilly minimum of -13°C (9°F) to a mild maximum of 16°C (61°F), with an average temperature hovering around 1°C (33°F). The month experiences substantial precipitation at 97 mm (3.8 in) over 13 days, accompanied by high humidity levels at 91%. In contrast, April brings a noticeable warming trend, with temperatures varying from a minimum of -4°C (24°F) to a pleasant maximum of 25°C (78°F) and an average of 9°C (49°F). Although April sees slightly less rainfall at 69 mm (2.7 in) over 12 days and lower humidity at 84%, it signals the arrival of spring and a shift towards milder and more inviting weather. For detailed weather insights, check Solothurn weather in April.
January weather is characterized by cold temperatures, with a minimum of -13°C (9°F) and an average of around 1°C (33°F). This month also sees frequent precipitation, totaling 97 mm (3.8 in) over 13 days, accompanied by high humidity levels at 91%. In contrast, May brings a significant warming trend, with temperatures ranging from a minimum of -1°C (31°F) to a pleasant maximum of 29°C (85°F) and an average of 13°C (55°F). Although May experiences more rainfall at 149 mm (5.9 in) over 18 days, the humidity is relatively lower at 80%. The transition from the icy grip of January to the mild warmth of May is quite striking, marking a clear shift in the seasonal landscape. For more details, you can visit Solothurn weather in May.
In January, the weather is quite frigid, with temperatures ranging from a minimum of -13°C (9°F) to a maximum of 16°C (61°F), averaging around 1°C (33°F). The month sees considerable precipitation, totaling 97 mm (3.8 in) over 13 days, accompanied by high humidity at 91%. In contrast, June brings a significant warming trend, featuring temperatures that range from a minimum of 5°C (41°F) up to a maximum of 34°C (93°F), with an average temperature of 18°C (65°F). While June is wetter with 134 mm (5.3 in) of precipitation over 17 days, the humidity is slightly lower at 82%. For more detailed information on the weather during June, you can check Solothurn weather in June.
January and July present stark contrasts in weather conditions. In January, temperatures can plummet to as low as -13°C (9°F), with an average around 1°C (33°F) and a maximum of 16°C (61°F). The month sees about 97 mm (3.8 in) of precipitation spread over 13 days and maintains a high humidity level of 91%. Conversely, July enjoys much milder weather, with temperatures ranging from a minimum of 8°C (47°F) to a maximum of 35°C (95°F) and an average of 19°C (67°F). Precipitation in July rises to 140 mm (5.5 in) over 15 days, but humidity is slightly lower at 82%. For further details, you can visit Solothurn weather in July.
When comparing the weather in January and August, there are significant differences in temperature and precipitation. In January, temperatures can drop as low as -13°C (9°F), with an average of 1°C (33°F) and a maximum of 16°C (61°F). This month also sees high humidity at 91% and frequent precipitation, occurring on about 13 days, totaling 97 mm (3.8 in). In contrast, August experiences much milder conditions, with a minimum temperature of 6°C (44°F), an average of 19°C (66°F), and highs reaching up to 33°C (91°F). Although August is wetter, receiving 145 mm (5.7 in) of rainfall over 17 days, the humidity is lower at 77%. For more detailed insights, check out Solothurn weather in August.
January and September offer distinctly different weather experiences. In January, temperatures plunge, with a minimum of -13°C (9°F) and an average hovering around 1°C (33°F). The month also sees significant precipitation, with around 97 mm (3.8 in) over 13 days, accompanied by high humidity levels of 91%. In contrast, September brings a much milder climate, with temperatures ranging from a minimum of 2°C (35°F) to a comfortable maximum of 29°C (84°F) and an average of 15°C (59°F). Precipitation is less frequent at 77 mm (3.0 in) across 12 days, and humidity decreases to 81%. For more details on the September climate, you can check this link: Solothurn weather in September.
In January, temperatures can plummet, with a minimum of -13°C (9°F) and an average of around 1°C (33°F), while October offers more mild temperatures, ranging from -2°C (28°F) to an average of 10°C (50°F). Precipitation levels are quite similar, with January receiving 97 mm (3.8 in) over 13 days and October slightly higher at 102 mm (4.0 in) across 14 days. Humidity is notably high in both months, with January at 91% and October slightly lower at 89%. For a detailed look at what to expect, check out Solothurn weather in October.
In January, temperatures often drop significantly lower than in November, with a minimum of -13°C (9°F) compared to November's milder minimum of -5°C (24°F). The average temperature in January hovers around 1°C (33°F), while November enjoys a slightly warmer average of 4°C (40°F) and can reach a maximum of 20°C (68°F). January also sees more precipitation, totaling 97 mm (3.8 in) over approximately 13 days, whereas November experiences slightly less with 79 mm (3.1 in) over the same number of days. Both months have high humidity levels, with January at 91% and November at 89%. For more insights into November's climate, check out Solothurn weather in November.
In January, the weather in Solothurn tends to be slightly colder than in December, with average temperatures hovering around 1°C (33°F) compared to December's average of 2°C (36°F). January also experiences lower maximum temperatures, reaching up to 16°C (61°F) versus December's maximum of 13°C (57°F). Additionally, January has slightly less precipitation at 97 mm (3.8 in), though it still rains on about 13 days, compared to December's 130 mm (5.1 in) over 19 days. Humidity remains constant at 91% during both months, contributing to the chilly atmosphere. For more details on December weather, you can check Solothurn weather in December.
As winter deepens in Solothurn, January ushers in a stark contrast to the milder months that come before and after it. With average temperatures hovering around 1°C, the chill in the air is palpable, and the city experiences notable precipitation with 13 wet days throughout the month, significantly higher than most other winter months. The humidity level reaches 91%, contributing to a cold, damp atmosphere that is quite different from the crisp air of December or the early promise of spring in February. To better understand how these winter conditions shape the monthly climate, explore more at Solothurn Climate.