Climate and monthly weather forecast
Sandefjord, Norway

Positioned in the southern part of Norway, Sandefjord braves a climate classified as Cfb (Marine west coast, warm summer) per Köppen climate classification. The geographical location of Sandefjord contributes to a climate with moderate maritime influences revealing itself in mild winters and cool to warm summers.

The temperature of the sea undulates from a chilly 2.8°C (37°F) during the winter months, reaching a peak at 18.4°C (65.1°F) in the peak of summer. Sea temperatures ascend steadily from a crisp 2.8°C (37°F) in March to an agreeable 18.4°C (65.1°F) in the heat of August. Following the peak in August, temperatures wane, receding to a chillier 6.3°C (43.3°F) by December.

Daylight duration oscillates throughout the year, limiting to just about 6.3 hours in December and expanding to reach a generous 18.4 hours by June. The longest days, mainly from May to July, reveal up to 18 hours of daylight while the winter months limit sunlight exposure to about 7 hours a day.

Sandefjord showcases no radical shifts in temperature through the seasons indicating a fairly stable weather pattern. However, the maritime effects on Sandefjord provoke increased cloud coverage and precipitation compared to inland areas creating a relatively humid climate even in summer.

Visitors seeking to relish the most agreeable weather in Sandefjord will find late spring to early summer from May to July most appealing. It is during this timeframe when the temperatures rise, reaching their annual zenith. The lengthening of daylight hours furthermore ensures the ability to enjoy the outdoor Scandinavian vistas for extended periods. May showcases the most significant surge in the sea temperature, which touches 11.3°C (52.3°F), ushering in inviting beach days through summer.

Sandefjord experiences the harshest conditions between December and February. The city is starved of sunlight during these months, with daylight hours dwindling to as low as 6.3. Additionally, the sea temperature descends to its coldest, averaging between 2.8°C (37°F) in February and 4°C (39.2°F) in December. The scarcity of daylight coupled with these cold temperatures make outdoor activities less enjoyable, potentially restricting visitor experiences.

From March to May, Spring reveals itself in a gradual rise in sea temperatures and an upswing in daylight hours. Emerging from the cooler Winter season, the sea temperature rises from 2.8°C (37°F) in March to reach 11.3°C (52.3°F) in May. Similarly, daylight hours significantly lengthen, expanding from approximately 11.9 hours in March to a lavish 17 hours in May.

Summer in Sandefjord, lasting from June through August, is characterized by long daylight hours and a warm sea. Daylight hours peak in June at 18.4 hours, gradually declining to 15.4 hours by August end. Comfortable swimming conditions are provided by the sea temperatures residing in a range between 15.3°C (59.5°F) to a peak of 18.4°C (65.1°F).

The autumn transitions begin in Sandefjord from September and last until November. The receding daylight hours from the summer's high, shave off rapidly, reducing to 7.7 hours by November. In harmony with the dwindling daylight, sea temperatures concede to the changes, dropping from 15.8°C (60.4°F) in September to 9.2°C (48.6°F) in November.

The winter months usher in considerably shorter daylight duration and a drop in sea temperature. December to February sees the daylight hours compress to anywhere from 6.3 hours to 7.1 hours. Sea temperatures during the winter months remain cold, hovering from 4°C (39.2°F) in December to a slightly colder 2.8°C (37°F) in February. These factors contribute to a notably cooler and more subdued weather experience inclusive of the potential for snow.

With the arrival of the New Year, Sandefjord can expect wintry conditions encompassing chilled sea and limited daylight hours. January has the coldest sea temperature, dipping down to a frigid 4°C (39.2°F). This month is wrapped in the shawl of winters post-holiday season, heavily influencing outdoor activities. Weather in January »

February greets Sandefjord with a slight increase in daylight hours but still holds onto the winter's chill in the sea. At this point, the sea temperature has plummeted to its annual low of 2.8°C (37°F). This month is considered the depth of winter, with its characteristic prolonged darkness and cold climate. Weather in February »

As March arrives in Sandefjord, there's a tangible shift in the weather, enhancing the mood of inhabitants and tourists. The daylight hours have significantly increased from February to March, offering nearly 11.9 hours of daylight. Weather in March »

April's arrival changes the weather dynamics in Sandefjord, with a significant rise in temperature and longer days. The sea temperature starts to warm up significantly, reaching a refreshing 6.4°C (43.5°F). With spring in full bloom, the city’s landscape transforms into a colourful canvas. Weather in April »

The pleasant weather transition continues in Sandefjord with the arrival of May. The temperature has warmed significantly in the sea, reaching a mild 11.3°C (52.3°F). The city bathes in sunlight for a substantial part of the day, promoting outdoor activities. Weather in May »

June offers the warmest sea temperature of the year, standing at 15.3°C (59.5°F). This coincides with the summer solstice, providing the city with the longest daylight hours. The perfectly warm seawater complements the long summer days, paving the way for swimming and sunbathing along the coast. Weather in June »

July brings a continuation of June's fair-weather trend in Sandefjord, with temperature readings soaring in both the day and night. July exhibits the highest sea temperature, a comfortable 17.8°C (64°F). The city indulges in the lushness of summer, with parks, gardens, and open spaces providing vibrant splashes of colour. Weather in July »

August marks the zenith of summer in Sandefjord, with sea temperatures peaking at a warm 18.4°C (65.1°F). The city continues to bask in elongated daylight hours offering ample time for extended outdoor pursuits. August tends to deliver consistently sunny days interspersed with brief, scattered showers. Weather in August »

September marks the onset of late summer and early fall, with temperatures beginning to dip in Sandefjord. Notably, the sea temperature falls to 15.8°C (60.4°F), introducing a cooler atmosphere. The days start to shorten, paving the way for prolonged twilight hours. Weather in September »

Autumn makes a grand entrance in Sandefjord in October with cooler temperatures and shorter days. A significant drop in sea temperature is noticeable, dropping down to 12.1°C (53.8°F). October showers bring a dampness to the air, enhancing the vibrant fall colours. Weather in October »

November in Sandefjord is characterized by a sea temperature of 9.2°C (48.6°F), marking the arrival of winters. The daylight continues to shorten, marking the onset of long, dark evenings. The previously colorful autumn leaves descend, exposing the skeletal frames of deciduous trees. Weather in November »

The year concludes on a chilly note in Sandefjord, with December featuring colder days and significantly less sunlight. Leaving the mild sea temperature of November, December hits a cool 6.3°C (43.3°F). Winter's dominance is unquestionable, with snowstorms painting the city white. Weather in December »