Last updated: August 27, 2025
September in Sandefjord, Norway offers a dynamic climate with temperatures ranging from a pleasant 23°C (73°F) maximum to a refreshing 5°C (40°F) minimum, resulting in an average of 13°C (56°F). This transitional month brings about 138 mm (5.4 in) of rainfall over approximately 14 days, contributing to the region's lush greenery. With humidity levels soaring at 86%, the air feels crisp yet invigorating, making it an ideal time for outdoor explorations amid picturesque landscapes. Whether strolling through quaint streets or enjoying coastal views, September in Sandefjord is a vibrant experience waiting to be embraced.
As September arrives in Sandefjord, Norway, the transition into autumn is palpable, with temperatures reflecting a delightful moderation. Average daily temperatures settle around a comfortable 13°C (56°F), offering a pleasant respite from the summer's warmth. Morning chills can be expected, as lows dip to about 5°C (40°F), while the afternoons reach a mild maximum of 23°C (73°F), making it ideal for outdoor activities. This month marks a significant drop from the sweltering heights of July and August, signaling the coming cool season. As nature begins to don its autumn colors, the shift in temperature invites both locals and travelers to embrace the beauty of Sandefjord's crisp, invigorating air.
September marks a significant shift in precipitation patterns for Sandefjord, Norway, as the month experiences a notable leap in rainfall, accumulating 138 mm (5.4 in) over 14 days—the highest monthly total since June. This surge not only positions September as a peak in precipitation volume but also highlights a trend towards wetter conditions as autumn arrives. Following the relative dryness of late spring and summer, the increasing number of rain-bearing days signals a transition, preparing the landscape for the forthcoming months where rainfall continues to rise, peaking in October with 155 mm (6.1 in). As the days grow shorter and cooler, the abundance of moisture transforms the region, ushering in the changes that define the Scandinavian fall.
In September, Sandefjord experiences a notable shift in humidity, settling at 86%. This month marks a transition as the summer's warmth wanes and autumn begins to take hold. Following August's slightly higher humidity of 77%, September's levels indicate that the coastal air is becoming cooler and moister, akin to the conditions felt in early spring. As the year progresses, humidity levels will rise again, nearing 92% in October and presenting the inevitable chill of winter. Overall, September serves as a bridge between the humid remnants of summer and the damp embrace of autumn in Sandefjord, showcasing the region's distinct seasonal rhythm.
As September rolls in, Sandefjord, Norway, experiences a notable shift in its UV Index, reflecting the transition from summer's peak to autumn’s gentle embrace. This month sees a moderate UV Index of 4, which indicates a slight decrease from the summer highs of 7 in June and July, yet still warrants caution during outdoor activities, with a burn time of just 30 minutes. The UV exposure category remains consistent with the previous month's trends, promoting awareness while offering a more comfortable sun experience. As daylight diminishes, this change is a timely reminder to enjoy the vibrant scenery while taking protective measures. For more information on local UV levels throughout the year, visit Sandefjord UV Index.
UV Risk Categories
As September graces Sandefjord, Norway, the transition from the sun-soaked summer months to the cooler embrace of autumn becomes evident. With 291 hours of sunshine, the days are still vibrant, though they indicate a gentle decline from the heights of 475 hours in July and 464 hours in June. This month captures the essence of late summer, as the sun’s presence lingers before October typically ushers in a more subdued 238 hours of daylight. Despite the waning sunlight, September’s glow offers a beautiful farewell to summer, as the serene waters and crisp air invite both locals and visitors to savor the last warming rays of the season. The gradual decrease in daylight hours paints a picturesque backdrop for autumn's arrival, making Sandefjord a charming destination for those seeking a blend of warmth and seasonal transition.
In Sandefjord, Norway, the likelihood of sunny weather takes a noticeable dip in September, with only a 27% chance of sunshine. This decline is particularly striking when compared to the preceding months, especially April and May, which boast much higher probabilities of clear skies at 58% and 31%, respectively. Following the vibrant summer months filled with reasonably sunny days in July and August, September ushers in a subtle transition towards the gloomier tones of fall. As daylight wanes and temperatures drop, the sun becomes a rarer sight, setting the stage for the approaching winter months characterized by even less sunshine. This shift marks September as a month where sunny spells are fleeting, inviting residents and visitors alike to seize any bright moments while they last.
As summer draws to a close, September in Sandefjord, Norway sees a transitional shift in daylight, offering approximately 12 hours of sunlight. This marks a gradual decline from the 18 hours enjoyed in June, as the days begin to shorten, paving the way for the crisp embrace of autumn. October will further reduce this daylight to 10 hours, continuing the downward trend. Despite the shortening days, September maintains a pleasant brightness reminiscent of the vibrant summer months, making it a beautiful time to experience the changing hues of nature before winter settles in.
In September, Sandefjord experiences a gentle shift in its winds, with an average speed of 3.5 m/s (8 mph), slightly stronger than the summer months. As the warm days of July and August recede, the winds pick up just a hint, signaling the transition into autumn. This trend continues as October brings even brisker conditions at 4.8 m/s (11 mph), foreshadowing the seasonal change. Throughout the year, the wind speeds in Sandefjord generally range from a low of 3.0 m/s (7 mph) in the height of summer to a peak of 4.8 m/s (11 mph) in the fall, illustrating a dynamic yet calming wind pattern that coexists with the region’s stunning coastal beauty.
Weather in Sandefjord varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Sandefjord, focusing on differences in temperature, rainfall, humidity, and UV levels.
September and January present stark contrasts in weather patterns. In September, temperatures range from a mild 5°C (40°F) at night to a comfortable 23°C (73°F) during the day, with an average of 13°C (56°F). The month sees significant rainfall, with 138 mm (5.4 in) spread over 14 days, accompanied by a high humidity level of 86%. In contrast, January brings much colder conditions, with temperatures dipping as low as -13°C (9°F) and peaking at a maximum of 11°C (51°F), resulting in an average temperature of 0°C (33°F). Precipitation decreases to 75 mm (2.9 in) over just 9 days, while humidity rises to 94%, creating a chillier and more damp atmosphere. For more about January weather in Sandefjord, visit Sandefjord weather in January.
In September, the weather in Sandefjord showcases a moderate temperature range, with minimums around 5°C (40°F) and maximums peaking at 23°C (73°F), creating a pleasant average of 13°C (56°F). This month also experiences significant rainfall, totaling 138 mm (5.4 in) over approximately 14 days, accompanied by high humidity levels at 86%. In stark contrast, February brings much colder conditions, with temperatures plunging to a minimum of -13°C (8°F) and only reaching a maximum of 9°C (49°F), averaging 0°C (32°F). The precipitation is lower, measuring 80 mm (3.1 in) across 11 days, but the humidity remains high at 92%. For more detailed insights on February weather, you can refer to Sandefjord weather in February.
In comparing the weather of September and March, notable differences emerge. September experiences milder temperatures, with a minimum of 5°C (40°F) and an enjoyable average of 13°C (56°F), reaching a pleasant maximum of 23°C (73°F). However, it also brings higher precipitation, averaging 138 mm (5.4 in) over approximately 14 days, accompanied by a humidity level of 86%. In contrast, March presents a much chillier climate, where temperatures can dip to a minimum of -12°C (10°F), with an average of just 2°C (36°F) and a maximum of 14°C (58°F). March is drier, with lower precipitation at 77 mm (3.0 in) spread over 9 days, although humidity is slightly higher at 89%. For more specific details on March weather, you can check Sandefjord weather in March.
When comparing the weather in September and April, we observe distinct differences in temperature and precipitation. September enjoys milder temperatures with a minimum of 5°C (40°F) and an average of 13°C (56°F), peaking at 23°C (73°F). In contrast, April starts off colder, with temperatures ranging from a minimum of -6°C (21°F) to a maximum of 20°C (67°F), with an average of 6°C (43°F). Precipitation is heavier in September, totaling 138 mm (5.4 in) over 14 days, while April is much drier with only 37 mm (1.5 in) across 5 days. Additionally, humidity levels are slightly higher in September at 86%, compared to April's 82%. For a closer look at April weather details, check out Sandefjord weather in April.
When comparing the weather in September and May, notable differences highlight the unique characteristics of each month. September tends to be milder, with average temperatures ranging from a minimum of 5°C (40°F) to a maximum of 23°C (73°F), while May is slightly cooler with a range from 1°C (33°F) to 27°C (81°F) on average. Additionally, September experiences higher humidity at 86%, contrasting with May's more comfortable 73%. Precipitation is also more frequent in September, with an average of 138 mm (5.4 in) over 14 days compared to May's 79 mm (3.1 in) across 11 days. This creates a wetter and more humid atmosphere in September, making it quite different from the relatively drier and warmer conditions found in May. For more details, you can refer to Sandefjord weather in May.
When comparing the weather in September and June, several key differences emerge. September features cooler temperatures, with a minimum of 5°C (40°F) and an average of 13°C (56°F), while June enjoys slightly warmer conditions, boasting a minimum of 6°C (44°F) and an average of 16°C (61°F). In terms of maximum temperatures, June reaches up to 27°C (81°F), significantly warmer than September's max of 23°C (73°F). Additionally, September experiences more precipitation, with 138 mm (5.4 in) over 14 days compared to June's 90 mm (3.6 in) over 11 days. Humidity levels are also higher in September at 86%, in contrast to June's 71%. For more detailed information on the weather specifics in June, you can view Sandefjord weather in June.
When comparing the weather in September to that of July, notable differences emerge in temperature and humidity. September experiences cooler temperatures with a minimum of 5°C (40°F), an average of 13°C (56°F), and a maximum of 23°C (73°F), while July is distinctly warmer, featuring temperatures ranging from a minimum of 9°C (49°F) to a maximum of 31°C (87°F) and an average of 18°C (64°F). Additionally, September sees higher precipitation levels, with 138 mm (5.4 in) over 14 days, compared to July’s 93 mm (3.7 in) across 11 days, and higher humidity at 86% versus July's 72%. For more detailed information on July weather, check out Sandefjord weather in July.
In comparing the weather between August and September, we see notable differences in temperature and precipitation. While August enjoys warmer temperatures with minimums around 9°C (48°F) and maximums reaching 26°C (79°F), September's temperatures drop, with a minimum of 5°C (40°F) and a maximum of 23°C (73°F). Additionally, September experiences increased precipitation, totaling 138 mm (5.4 in) over 14 days, compared to the 90 mm (3.5 in) over 13 days in August. Humidity levels also rise significantly in September to 86%, compared to 77% in August. For a more detailed look at August weather, you can check Sandefjord weather in August.
September and October present a noticeable shift in weather patterns. In September, temperatures span from a mild minimum of 5°C (40°F) to a comfortable maximum of 23°C (73°F), while the average hovers around 13°C (56°F). The month sees about 138 mm (5.4 in) of precipitation over 14 days, with humidity levels at a relatively high 86%.
In contrast, October brings cooler temperatures, with a minimum dipping to -1°C (30°F) and an average of 9°C (48°F), peaking at a maximum of 17°C (62°F). Precipitation slightly increases to 155 mm (6.1 in) across 15 days, and humidity rises further to 92%. For a closer look at what to expect, check out Sandefjord weather in October.
September and November exhibit notably different weather patterns. In September, temperatures typically range from a minimum of 5°C (40°F) to a maximum of 23°C (73°F), with an average of 13°C (56°F). This month also sees a fair amount of precipitation, totaling 138 mm (5.4 in) over approximately 14 days, accompanied by a humidity level of 86%. By contrast, November experiences chillier conditions, with temperatures dropping to a minimum of -7°C (19°F) and an average of 4°C (40°F), peaking at 14°C (57°F). While the precipitation amount is slightly lower at 128 mm (5.1 in), it is spread over more days, totaling 16, coupled with a higher humidity of 93%. For more insights into the November climate, you can visit Sandefjord weather in November.
September and December weather in Sandefjord present notable differences. In September, temperatures range from a minimum of 5°C (40°F) to a maximum of 23°C (73°F), accompanied by an average temperature of 13°C (56°F). The month sees a significant amount of precipitation, with about 138 mm (5.4 in) falling over 14 days, and humidity levels are relatively high at 86%.
In contrast, December brings a much colder climate, with temperatures ranging from a min of -9°C (16°F) to a max of 9°C (49°F), resulting in an average temperature of just 1°C (34°F). Precipitation is slightly lower at 127 mm (5.0 in), but it occurs over more days—17 in total—with an increase in humidity to 93%. For more detailed insights on the weather conditions in December, you can check Sandefjord weather in December.
As September unfolds in Sandefjord, the transition from summer to autumn becomes evident with cooler temperatures and increased rainfall. While highs can still reach a pleasant 23°C, the average shifts to a brisk 13°C, often accompanied by morning chill and the potential for sweater weather. With 14 days of precipitation, the month showcases an 86% humidity level, indicating a dampness that sets the stage for the vibrant autumn foliage. This blend of cooler weather and occasional rain fosters a serene charm unique to September, making it a perfect time to explore the outdoors. For more detailed insights, visit Sandefjord Climate.