Last updated: March 17, 2025
In September, Borgarnes, Iceland experiences a captivating blend of autumnal chill and vibrant natural beauty. Average temperatures hover around a cool 8°C (47°F), with maximums reaching 16°C (61°F), while the mercury can dip as low as -2°C (29°F) during the night. This transitional month brings significant precipitation, with an impressive 180 mm (7.1 in) of rain spread over 21 days, resulting in an atmospheric humidity of 92%. As the landscape transforms, visitors can enjoy the crisp air and dramatic scenery, making it a unique time to experience this Icelandic gem.
In September, Borgarnes, Iceland, begins to greet the crispness of autumn, offering a gentle transition from the warmth of summer. The temperatures typically range from a minimum of -2°C (29°F) to a maximum of 16°C (61°F), with an average around 8°C (47°F). This month marks a noticeable cool down, as nighttime temperatures hint at the approaching winter, while the pleasant afternoons can still offer a taste of late-season sunshine. As the days grow shorter and the landscapes transform with autumn hues, September in Borgarnes is a captivating blend of lingering warmth and the fresh embrace of cooler weather, drawing visitors to experience the serene beauty of Icelandic nature in flux.
In September, Borgarnes, Iceland, experiences a notable uptick in precipitation, receiving an impressive 180 mm (7.1 in) of rain over the month. This surge marks a significant contrast to the preceding summer months, where rainfall remained relatively low. With 21 days of precipitation, September stands out as the wettest month of the year, heralding the transition into autumn. This trend also reflects a broader seasonal shift, as the average daily rainfall steadily increases from the drier days of July and August, emphasizing the dynamic weather patterns that characterize this region. In this time of year, the lush landscapes of Borgarnes become vividly rejuvenated, inviting nature enthusiasts to witness the transformation of the Icelandic countryside.
In Borgarnes, Iceland, September experiences a significant shift in humidity, with levels reaching 92%. This rise from the drier summer months reflects the transition into autumn, as the previous highs of 86% in July and 88% in August give way to a more moisture-laden atmosphere. As the year progresses, humidity levels generally trend upward, peaking in the winter months, but September’s increase signals the onset of seasonal changes, balancing the warmth of summer with the coolness of fall. Such high humidity levels contribute to the region's lush landscapes and vibrant ecosystems, making it a unique time to appreciate the natural beauty of Iceland.
In September, the UV Index in Borgarnes, Iceland, shows a moderate level of 3, indicating a slight decrease from the height of summer months, which peaked at 6 in both June and July. This transition reflects a shift in the seasonal sunlight, as the burn time increases to 30 minutes. As autumn approaches, the UV exposure category remains moderate, similar to April and May, challenging sunny days to provide ample opportunity for outdoor activities while reminding locals and visitors to be mindful of sun protection. For a detailed overview and to stay informed, visit Borgarnes UV Index.
UV Risk Categories
As summer gradually yields to autumn in Borgarnes, Iceland, September offers a delightful blend of lingering warmth and transitioning light. With 187 hours of sunshine, this month shines as a perfect farewell to the vibrant summer days, showcasing a noticeable decline from the peak of 337 hours in May. The gradual shift is evident as the hours of sunlight decrease, yet September maintains a golden charm, making it a lovely time for outdoor exploration. Following the lush summer, the sunshine in September becomes a gentle reminder of the approaching winter, as the sun begins to dip once more into the shadows of October, which sees a steep drop to just 134 hours. This ebb and flow of daylight highlight the dynamic beauty of Iceland's changing seasons.
In Borgarnes, Iceland, the likelihood of sunny weather in September is relatively low, with only a 12% chance of sunshine. This pattern reflects a broader trend seen throughout the late summer and early autumn months, where chances of clear skies consistently dip — July and August both hover around a mere 10% and 11%, respectively. Interestingly, this gradual decline comes after a more promising 51% chance in May, suggesting that while early summer invites brighter days, the autumn transition quickly brings overcast skies. As September arrives, the promise of sun becomes increasingly elusive, continuing a trend that reminds visitors to prepare for the unpredictability of Icelandic weather, especially as they head toward the chillier months ahead.
As summer fades, September brings a gentle shift in daylight hours to Borgarnes, Iceland. With 12 hours of daylight, this month marks a transition from the sun-drenched days of June and July, which bask in nearly 21 hours of sunshine, to the more muted 9 hours typical of October. The gradual decrease in daylight is part of a beautiful natural rhythm, mirroring the gradual cooling of temperatures. In September, the lingering sunlight still allows for ample opportunity to explore the stunning landscapes, making it a perfect time to enjoy the rich hues of autumn as nature prepares for the long winter ahead.
As September arrives in Borgarnes, Iceland, the wind begins to stir with a noticeable vigor, averaging 4.8 m/s (11 mph). This marks a refreshing increase from the calmer summer months, where the wind dipped to its lowest average of 3.0 m/s (7 mph) in August. It's a time when the gentle summer breezes give way to the crisp, invigorating currents of early autumn, engaging both locals and visitors with nature's dramatic shift. Following September, the wind speed sees a slight decrease in October, falling to 4.6 m/s (10 mph), suggesting a transition into the cooler months ahead. This dynamic fluctuation captures the essence of Icelandic weather, where each season brings its unique spirit and charm.
The weather in Borgarnes changes throughout the year, offering a unique experience in each season. Below is a month-by-month comparison of September's weather with other months, highlighting differences in temperature, precipitation, and other key factors. Click on each section to discover seasonal trends in Borgarnes and find detailed weather information for every month.
September and January present notably different weather conditions. In September, temperatures range from a chilly -2°C (29°F) at night to a mild 16°C (61°F) during the day, with an average temperature of 8°C (47°F). The month experiences considerable rainfall, totaling 180 mm (7.1 in) over 21 days, coupled with high humidity at 92%. In contrast, January sees much colder temperatures, with minimums plummeting to -15°C (6°F) and maximums reaching only 10°C (50°F), averaging at -1°C (31°F). Despite lower precipitation levels of 117 mm (4.6 in) over 15 days, the humidity remains high at 96%. For more details on how the weather compares, check out Borgarnes weather in January.
September and February present distinct contrasts in weather patterns. In September, temperatures range from a chilly -2°C (29°F) at night to a pleasant average of 8°C (47°F), peaking at 16°C (61°F) during the day. The month is characterized by high precipitation, with 180 mm (7.1 in) spread over 21 days, leading to a humidity level of 92%. In contrast, February is much colder, with temperatures dipping to a minimum of -15°C (5°F) and averaging 0°C (32°F), reaching a maximum of only 8°C (47°F). While precipitation is lower at 120 mm (4.7 in) over 17 days, humidity increases slightly to 95%. For a closer look at what you can expect, check out the detailed Borgarnes weather in February.
September and March present distinctly different weather conditions. In September, temperatures range from a minimum of -2°C (29°F) to a maximum of 16°C (61°F), with an average of 8°C (47°F). The month sees significant precipitation of 180 mm (7.1 in) spread over 21 days, accompanied by high humidity at 92%. In contrast, March is colder, with temperatures dipping as low as -11°C (13°F) and peaking at 9°C (48°F), resulting in an average of just 1°C (34°F). While it has less rainfall at 108 mm (4.3 in) over 17 days, the humidity remains high at 94%. For more details, visit Borgarnes weather in March.
In comparing the weather of September and April, September generally offers milder conditions with average temperatures around 8°C (47°F), peaking at a comfortable 16°C (61°F), whereas April is chillier, with an average of 4°C (39°F) and maximums reaching only 13°C (56°F). Precipitation is significantly higher in September, totaling 180 mm (7.1 in) over 21 days, compared to April's 114 mm (4.5 in) over 17 days, indicating a wetter month as autumn sets in. Humidity levels are also higher in September at 92%, compared to 87% in April, contributing to the damp feel often associated with early fall. For a closer look at April's specific weather patterns, you can refer to Borgarnes weather in April.
September and May exhibit some intriguing similarities and differences in weather patterns. Both months can experience temperatures ranging from a minimum of around -2°C (28°F to 29°F) to a maximum of 16°C (61°F), yet September boasts a slightly warmer average temperature of 8°C (47°F) compared to May's average of 7°C (44°F). In terms of precipitation, September is notably wetter, with 180 mm (7.1 in) of rainfall over 21 days, while May sees only 104 mm (4.1 in) across 16 days. Additionally, September's humidity level is higher at 92%, compared to 85% in May. For more details on what to expect during this spring month, check out Borgarnes weather in May.
When comparing the weather in September and June, we can see distinct differences. September experiences a wider range of temperatures, with a minimum of -2°C (29°F), an average of 8°C (47°F), and a maximum of 16°C (61°F). In contrast, June has slightly milder temperatures, with a minimum of 2°C (37°F), an average of 9°C (49°F), and a maximum of 19°C (66°F). Additionally, September is much wetter, recording 180 mm (7.1 in) of precipitation over 21 days, compared to June's 87 mm (3.4 in) falling across 14 days. Humidity levels are also higher in September at 92%, compared to June's 81%. For more details on June weather in Borgarnes, you can visit Borgarnes weather in June.
When comparing the weather in September to that of July, notable differences emerge. September features cooler temperatures, with a minimum of -2°C (29°F) and an average of 8°C (47°F), while July enjoys milder conditions, with a minimum of 5°C (41°F) and an average of 11°C (52°F). The maximum temperature in July reaches 21°C (70°F), significantly warmer than September's peak of 16°C (61°F). Additionally, September experiences higher precipitation, totaling 180 mm (7.1 in) over 21 days, compared to July's 78 mm (3.1 in) over 17 days. Humidity is also slightly higher in September at 92%, compared to July's 86%. For more detailed information on July weather, check Borgarnes weather in July.
In comparing the weather of September to that of August, it is evident that September experiences noticeably cooler temperatures, with a minimum of -2°C (29°F) and a maximum of only 16°C (61°F). In contrast, August tends to be milder, featuring minimum temperatures of 5°C (41°F) and maximums reaching 20°C (68°F). Additionally, September sees significantly more precipitation, with 180 mm (7.1 in) over 21 days, compared to August's 85 mm (3.3 in) across just 12 days. While both months maintain high humidity levels, September is slightly higher at 92% compared to August's 88%. For a detailed look at August weather, check out Borgarnes weather in August.
In comparing the weather conditions of September and October, September is generally milder, featuring an average temperature of 8°C (47°F) with a maximum of 16°C (61°F). The month experiences significant rainfall, totaling 180 mm (7.1 in) over 21 days, and a high humidity level of 92%. In contrast, October sees cooler temperatures, with an average of 5°C (41°F) and a maximum of 13°C (55°F). The precipitation also decreases to 94 mm (3.7 in) over 16 days, while humidity remains relatively stable at 93%. For more detailed information, you can check Borgarnes weather in October.
September and November exhibit distinct differences in weather patterns. In September, temperatures range from a minimum of -2°C (29°F) to a maximum of 16°C (61°F), with an average of 8°C (47°F). This month experiences considerable rainfall, totaling 180 mm (7.1 in) over 21 days, alongside high humidity levels at 92%. In contrast, November sees lower temperatures, with a minimum of -12°C (12°F) and a maximum of 11°C (52°F), resulting in an average of just 1°C (35°F). Although precipitation is less at 103 mm (4.1 in) over 15 days, the humidity remains high at 94%. For a closer look at November's weather specifics, visit Borgarnes weather in November.
In comparing the weather between September and December, September displays milder temperatures, with averages around 8°C (47°F), while December sees a notable drop, with an average temperature hovering around 0°C (33°F). Precipitation levels are higher in September, totaling 180 mm (7.1 in) over 21 days, compared to December's 110 mm (4.3 in) falling over 17 days. Humidity levels are slightly elevated in December at 95%, compared to September's 92%. For a more detailed look at December weather, you can check Borgarnes weather in December.
As September rolls into Borgarnes, the weather takes a striking turn, transitioning from the lingering warmth of summer to the brisk embrace of autumn. With an average temperature settling at a cool 8°C (47°F), and the potential for lows dipping below freezing, this month marks a notable shift in climate. Precipitation is frequent, with rain gracing the area on 21 days, leading to a higher average humidity of 92%, which can make the air feel particularly moist and crisp. This blend of cooler days and increased moisture differentiates September from the drier, warmer summer months. For those curious about how the weather evolves throughout the year, more insights can be found at Borgarnes Climate.