Last updated: February 24, 2025
September in Fairbanks, United States, offers a stunning transition into fall, characterized by a maximum temperature reaching 23°C (74°F) and an average of 9°C (48°F). As days grow cooler, temperatures can dip as low as -8°C (18°F), showcasing the unique climate of the region. This month sees 43 mm (1.7 in) of precipitation, spread over 9 rainy days, contributing to a high humidity level of 90%. The interplay of crisp air and lingering warmth makes September a captivating time to experience the natural beauty of Fairbanks.
In September, Fairbanks, United States, experiences a noticeable shift as summer transitions to fall. The temperatures showcase a broad range, with minimums dropping to a chilly -8°C (18°F) and maximums peaking at a comfortable 23°C (74°F). The average temperature settles around 9°C (48°F), reflecting the gradual cooling trend that begins to take hold after the warmth of summer. This month effectively marks the end of the milder heat of August, where we still saw highs of 31°C (88°F), making the arrival of brisk mornings and cooler evenings quite evident. As Fairbanks heads deeper into fall, the city's landscape transforms, reminding residents that winter is just around the corner.
September in Fairbanks marks a transition as summer gently gives way to autumn. With an average precipitation of 43 mm (1.7 in) spread over 9 days, it strikes a balance between the lush wetness of August and the drier months that follow. This slight dip in both rainfall and rainy days reflects a consistent trend seen throughout the month, hinting at the cooler, crisp air that defines the Alaskan fall. Compared to the previous month’s 104 mm (4.1 in), September's precipitation indicates a gradual shift, suggesting that while the region still experiences moisture, it is preparing for the clearer, cooler days ahead.
As September arrives in Fairbanks, the humidity levels settle at 90%, reflecting a slight increase from the previous month. This trend follows a typical seasonal pattern where summer's warmth gives way to the cooler embrace of autumn. Throughout the year, humidity begins its journey at a high 96% in January, gradually decreasing to 77% in May, only to see a resurgence toward the end of summer with 88% in August. Notably, September serves as a transition month, bridging late summer's lingering warmth and the approaching chill of winter, which inevitably drives humidity back up to 97% in October and peaks at 100% by November. This cyclical rhythm highlights Fairbanks' unique climate, where seasons shift dramatically, enhancing the moisture-laden atmosphere as winter draws near.
In September, Fairbanks experiences a moderate UV Index of 3, marking a slight decrease from the summer months when the index peaked at 5. This trend reflects the transition into autumn, as sunlight becomes less intense. With a burn time of 30 minutes, it's important for residents and visitors to remain cautious while enjoying the cool, crisp air. As the daylight gradually fades, the UV levels decrease significantly, shifting back to a low category in October. For more insights on UV exposure throughout the year, check out the full details at Fairbanks UV Index.
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In September, Fairbanks experiences a gentle transition from the vibrant days of summer to the crispness of autumn. With 199 hours of sunshine, September marks a significant drop from the peak of 424 hours in June, yet still offers a promising canvas of daylight compared to the dwindling hours ahead in October. This month captures the essence of early fall, where the fading warmth of summer lingers, providing just enough sunlight to showcase the stunning autumn foliage. As the year progresses, the trend becomes increasingly clear: the days grow shorter, catapulting Fairbanks into a cozy embrace of longer nights and limited sunlight, with November and December promising only 72 and 34 hours respectively. September stands as a cherished month of balance, where the fading sunshine invites reflection before the winter's shadow descends.
In September, the sun graces Fairbanks with a 34% chance of shining, mirroring the lackluster summer months of July and August, which also hover around the same percentage. Interestingly, this slight decline in sunny days contrasts with the more promising weather seen in April (49%) and even November (37%). While September marks the transition into fall, the likelihood of sunny weather still holds a steady ground compared to the preceding summer months, suggesting that while the days are getting shorter, there are still opportunities for golden rays to break through the clouds. As autumn settles in, Fairbanks experiences a fleeting blend of lingering summer warmth and the crispness of impending winter.
As September unfolds in Fairbanks, the daylight hours begin their graceful decline, offering 12 hours of sunlight that serve as a gentle transition from the long summer days of June and July. After peaking at 21 hours of daylight in June, the sun's presence gradually wanes, marking the approach of the colder months. This month serves as a poignant reminder of the shifting seasons—while August still holds onto 16 hours of daylight, September's drop signals the preparatory phase for the upcoming autumn. Looking ahead, the daylight will further recede to 9 hours in October, completing the seasonal cycle from the lush brightness of summer to the early darkness of winter.
As September arrives in Fairbanks, the winds begin to whisper a seasonal transition, with an average wind speed of 1.9 m/s (4 mph). This gentle breeze marks a subtle shift from the summer months, reflecting a gradual decline from the higher speeds experienced earlier in the year. Notably, after hitting its peak in January and December at 2.7 m/s (6 mph), the wind eases into autumn, becoming calmer and more contemplative. The pattern throughout the year showcases a steady variability, with the calmest conditions typically found in June and September. As the days grow shorter, this softer wind serves as a reminder of the approaching winter, inviting residents and visitors alike to embrace the crisp, tranquil atmosphere that September in Fairbanks has to offer.
The weather in Fairbanks 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 Fairbanks and find detailed weather information for every month.
In September, the weather in Fairbanks is notably milder, with average temperatures around 9°C (48°F) and a maximum of 23°C (74°F), making it a comfortable time of year. The month experiences about 43 mm (1.7 in) of precipitation over approximately 9 days, along with a high humidity of 90%. In stark contrast, January plunges into deep winter, with average temperatures dropping to -19°C (-2°F) and a chilling minimum of -46°C (-50°F). Precipitation is significantly lower at 13 mm (0.5 in) over just 4 days, but the humidity remains high at 96%. For more insights on the cold weather, check out Fairbanks weather in January.
September and February present starkly contrasting weather patterns. In September, temperatures range from a chilly minimum of -8°C (18°F) to a pleasant maximum of 23°C (74°F), with an average around 9°C (48°F). The month experiences a moderate level of precipitation at 43 mm (1.7 in) over about 9 days, accompanied by high humidity at 90%. In sharp contrast, February sees temperatures plummet, with a minimum reaching -40°C (-39°F) and a maximum only hitting 4°C (40°F), averaging -16°C (3°F). Precipitation is lower in February, totaling 24 mm (1.0 in) across around 7 days, yet the humidity remains high at 93%. For a detailed glimpse into February's weather, visit Fairbanks weather in February.
In comparing September and March weather, the stark differences are evident. September experiences a much milder temperature range, with a minimum of -8°C (18°F), an average of 9°C (48°F), and a maximum of 23°C (74°F). In contrast, March is significantly colder, with temperatures dipping as low as -37°C (-34°F), an average of -10°C (14°F), and a maximum of 13°C (56°F). Precipitation in September is higher, totaling 43 mm (1.7 in) over 9 days, while March sees less at 21 mm (0.8 in) spread over just 6 days. The humidity levels are quite similar, with September at 90% and March close behind at 89%. For more detailed insights, you can check Fairbanks weather in March.
In comparing the weather of September to April, it's evident that September tends to be significantly milder. While September experiences temperatures ranging from a minimum of -8°C (18°F) to a maximum of 23°C (74°F) with an average of 9°C (48°F), April is much colder, with temperatures ranging from a minimum of -29°C (-19°F) to a maximum of 19°C (66°F) and an average of 0°C (33°F). Additionally, September has more precipitation, measuring 43 mm (1.7 in) over 9 days, whereas April sees only 20 mm (0.8 in) across 5 days. Humidity levels are relatively close, with September at 90% and April at 85%. For more details on April weather, you can explore Fairbanks weather in April.
September and May present notably different weather patterns. In September, temperatures can range from a chilly minimum of -8°C (18°F) to a comfortable maximum of 23°C (74°F), with an average temperature of 9°C (48°F). The month sees more precipitation, averaging 43 mm (1.7 in) over 9 days, and a high humidity level of 90%. In contrast, May experiences milder conditions with temperatures ranging from -4°C (25°F) to 27°C (81°F), averaging 11°C (52°F). Precipitation is less frequent at 24 mm (0.9 in) over just 7 days, and the humidity is lower at 77%. For a more detailed look at the weather in May, visit Fairbanks weather in May.
September and June present contrasting weather patterns in Fairbanks. In September, temperatures range from a chilly minimum of -8°C (18°F) to a pleasant maximum of 23°C (74°F), with an average of 9°C (48°F). The month sees around 43 mm (1.7 in) of precipitation over 9 days, accompanied by high humidity at 90%. Conversely, June offers warmer conditions, with temperatures fluctuating from a minimum of 5°C (42°F) to a soaring maximum of 32°C (90°F), and an average of 17°C (63°F). It has slightly higher precipitation at 56 mm (2.2 in) over 12 days, but with lower humidity at 78%. For more detailed weather information, you can check Fairbanks weather in June.
September and July present quite contrasting weather patterns. In September, temperatures range from a chilly minimum of -8°C (18°F) to a pleasant maximum of 23°C (74°F), with an average temperature of 9°C (48°F). The month sees 43 mm (1.7 in) of precipitation over about 9 days, accompanied by high humidity levels at 90%. In contrast, July enjoys much warmer conditions, with temperatures starting at a minimum of 5°C (42°F) and soaring to a maximum of 31°C (89°F), yielding an average of 18°C (66°F). With slightly higher precipitation at 49 mm (1.9 in) over 10 days and humidity at 85%, July clearly provides a more summery experience. For a more detailed look at July weather, check out Fairbanks weather in July.
Comparing the weather between August and September reveals a significant change in temperature and precipitation patterns. In August, the temperatures are generally warmer, with minimums around 4°C (39°F) and maximums reaching up to 31°C (88°F), accompanied by higher precipitation levels of 104 mm (4.1 in) over 15 days. This results in a somewhat warm and humid atmosphere, with humidity at 88%. In contrast, September sees cooler temperatures, with a minimum of -8°C (18°F) and a maximum of 23°C (74°F). Although September experiences lower precipitation at 43 mm (1.7 in) over 9 days, the humidity is slightly higher at 90%, contributing to a crisp fall feeling. For more detailed information on August weather, check out Fairbanks weather in August.
September typically ushers in milder temperatures, with averages around 9°C (48°F) and a maximum of 23°C (74°F), making it a generally pleasant month. However, as we transition into October, temperatures dip, featuring a minimum of -14°C (7°F) and an average of 0°C (33°F), which significantly alters the overall feel of the season. While September receives 43 mm (1.7 in) of precipitation over 9 days, October comes in slightly drier with 39 mm (1.5 in) across just 7 days, though the humidity rises notably to 97%. For a detailed look at the climate in October, check out Fairbanks weather in October.
In September, the weather is relatively mild, with temperatures ranging from a minimum of -8°C (18°F) to a maximum of 23°C (74°F), resulting in an average of 9°C (48°F). The month experiences 43 mm (1.7 in) of precipitation over 9 days, coupled with a humidity level of 90%. In contrast, November brings much colder conditions, with temperatures dropping to a minimum of -35°C (-30°F) and only reaching a maximum of 8°C (46°F), leading to an average temperature of -12°C (11°F). Precipitation is slightly lower at 31 mm (1.2 in) over 8 days, but the humidity spikes to 100%, creating a stark difference in the overall weather experience between the two months. For more details, check out Fairbanks weather in November.
September and December present a stark contrast in weather conditions. In September, temperatures range from a mild -8°C (18°F) at night to a pleasant max of 23°C (74°F) during the day, accompanied by an average temperature of 9°C (48°F). The month sees approximately 43 mm (1.7 in) of precipitation spread over 9 days, with humidity around 90%. In contrast, December plunges into much colder territory; temperatures drop drastically to a minimum of -39°C (-38°F) and peak at just 5°C (41°F), with an average of -15°C (5°F). Although precipitation is slightly less at 33 mm (1.3 in) over 6 days, the humidity rises to a near-saturated 99%. For a more detailed look at December weather, visit Fairbanks weather in December.
As September unfolds in Fairbanks, the transition from the warm embrace of summer to the crispness of autumn becomes evident. While daytime temperatures still flirt with comfortable highs, the nights dip significantly, introducing the first hints of frost. The increased humidity and regular precipitation speak to the shifting weather patterns, making this month noticeably wetter than its summer counterparts. With an average of nine rainy days, residents and visitors alike should prepare for a blend of sunshine and showers. As the landscape begins to showcase the vibrant hues of fall, September offers a unique palette of changing colors and cooler breezes. To explore more about what to expect throughout the year, check out Fairbanks Climate.