September Weather in Haines, United States

Last updated: February 24, 2025

September in Haines, United States, offers a captivating transition into the fall season, featuring a maximum temperature of 23°C (73°F) and an average temperature of 9°C (49°F). With a minimum temperature dipping to -5°C (24°F), the weather can be quite variable. The month is characterized by substantial rainfall, accumulating 222 mm (8.7 in) over approximately 18 days, leading to a notably high humidity level of 105%. Visitors can expect a mix of brisk, fresh air and the occasional drizzly day, painting a picturesque backdrop of vibrant autumn colors.

September Temperature in Haines

In September, Haines, United States transitions into the brisk embrace of autumn, presenting a notable shift in temperatures. With minimums dipping to -5°C (24°F) and an average hovering around 9°C (49°F), the chill heralds the changing seasons. Daytime highs can still reach a pleasant 23°C (73°F), offering a final taste of summer warmth. This month marks a departure from the more temperate conditions of July and August, as the once-warm days inevitably give way to cooler nights, reminding residents and visitors alike that winter is just around the corner. The gradual descent into cooler temperatures encapsulates the essence of September in Haines, making it a picturesque time for outdoor activities amidst the vibrant foliage.

September Weather in Haines: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Haines, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec191624334051565548342324
Data source: Temperature data for Haines generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Haines

In Haines, September marks a notable transition in precipitation patterns, as the area receives 222 mm (8.7 in) of rain over 18 days. This volume closely trails August's heavy rainfall of 227 mm (8.9 in), indicating a continuation of the late summer wet season. As autumn approaches, the frequency of rain-soaked days remains high, foreshadowing the wetter months ahead. Notably, September's precipitation, while substantial, is a precursor to the significantly increased levels seen in October, which averages 318 mm (12.5 in). This trend suggests that as the year progresses, Haines prepares itself for a dramatic uptick in rainfall, culminating in a winter season characterized by consistent and heavy precipitation.

September Precipitation Trends in Haines

The chart displays monthly precipitation patterns in Haines, with values for each month alongside September's data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September's conditions compare to those of other months.
JanFebMarAprMayJunJulAugSepOctNovDec250161188150150141109227222318276363
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Haines

September in Haines, United States, showcases a significant transition in humidity levels, maintaining a notably high average of 105%. This month continues the trend of the summer peak, with August reaching an exceptional 117%, the highest recorded. Since June, when humidity hit a perfect 100%, Haines has experienced a gradual but substantial increase, reflecting the area's moist coastal climate. The persistent high humidity from the warmer months signals a lingering wetness that carries into autumn, setting the stage for the following months, which gradually decline but remain elevated, as October's humidity sits at 98%. As the year progresses from the lush humidity of summer to the more moderate levels typical in the fall, Haines remains a place of noteworthy atmospheric richness.

September Average Humidity in Haines

This chart illustrates the average monthly humidity levels in Haines, with September's data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, allowing you to see how September's humidity levels compare to other months.
JanFebMarAprMayJunJulAugSepOctNovDec94%90%93%93%92%100%110%117%105%98%96%95%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Haines

As September rolls in, Haines, Alaska, experiences a slight dip in the UV Index, settling at 5, which falls into the moderate exposure category. This indicates a notable change from the peak summer months, where the UV Index reached 7 for several consecutive months. With a recommended burn time of 30 minutes, it's essential to remain mindful of sun safety as you enjoy the crisp autumn weather. The transition from high to moderate UV levels in September signifies the waning sunlight of summer, inviting residents and visitors alike to relish the beauty of nature while being cautious about exposure. For detailed information and tips on managing sun exposure, check out the Haines UV Index.

Maximum UV Index Levels in Haines for September

The chart shows the monthly maximum UV Index (UVI) for Haines in September, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues.
JanFebMarAprMayJunJulAugSepOctNovDec124577775211
Data source: Haines September UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

September Sunshine in Haines

In Haines, United States, September marks a gentle transition as the summer warmth begins to wane. With 170 hours of sunshine, it reflects a subtle decline from the vibrant peaks of late spring and early summer, which brimmed with sunlight, topping out at 248 hours in May. As the summer months gradually faded, July and August brought around 247 and 195 hours, respectively, showcasing a strong but dwindling luminosity. The onset of September ushers in a refreshing shift, balancing beautiful, sunlit days with the anticipated cooler temperatures of autumn. This trend underscores Haines' unique climate, where summer's lingering presence gradually succumbs to shorter days, inviting cozy fall vibes while still basking in a considerable glow.

Monthly Sunshine Duration in Haines: September Highlighted

The September sunshine duration represents the total number of hours Haines experiences direct sunlight during the month of September, excluding cloudy or obstructed periods. This chart compares the sunshine duration of September with the other months of the year.
JanFebMarAprMayJunJulAugSepOctNovDec43h126h176h229h248h246h247h195h170h94h59h37h
Data source: Haines September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Haines During September

In Haines, the likelihood of sunny weather in September drops significantly, with only a 6% chance of sunshine gracing the skies. This decline reflects a broader trend of diminishing sunlight as summer wanes, particularly evident when compared to the preceding months of July and August, which hover around 20%. The transition into autumn sees sunshine becoming increasingly elusive, a pattern that continues into October and November, where chances remain low at 7% and 10%, respectively. As the year progresses, it becomes clear that September is part of a pattern of reduced brightness, setting the stage for Haines’ more overcast months ahead.

Percentage of Sunny Days in September in Haines

The chart illustrates the percentage of sunny days in Haines throughout the year, with September highlighted. It highlights the variation in sunshine across each month and provides an overview of the typical frequency of sunny days, offering insights into how often Haines experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec15%42%17%39%9%20%21%15%6%7%10%23%
Data source: Haines September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Haines in September

As September arrives in Haines, the lingering warmth of late summer is reflected in the daylight duration, offering 12 hours of sunlit bliss. This marks a gentle decline from the 15 hours experienced in August, signaling the transition towards autumn. While daylight diminishes, it does so gracefully, having peaked in June at an impressive 18 hours. This gradual retreat is part of a broader pattern throughout the year, where the long, vibrant days of summer give way to the enchanting, shorter days of fall and winter. As the month progresses, the sun's descent begins to establish a cozy ambiance, inviting residents to embrace the changing seasons.

Average Daylight Hours in Haines for September

The chart illustrates the variation in daylight duration in Haines throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec7h 1m9h 16m11h 54m14h 35m17h 2m18h 25m17h 38m15h 21m12h 44m10h 5m7h 37m6h 13m
Data source: Haines daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Haines

As September unfolds in Haines, the breezes begin to pick up slightly, with an average wind speed of 1.5 m/s (3 mph)—a refreshing change from the summer months. The wind peaks modestly in August at 1.7 m/s (4 mph), providing a hint of the season's transition. Following September, the winds take a gentle dip, dropping to 1.1 m/s (2 mph) in October. Overall, the wind patterns throughout the year suggest a serene atmosphere, with subtle increases during the warm summer months and calming shifts as autumn approaches. This rhythmic dance of winds invites both exploration and reflection amid the stunning Alaskan landscape.

Average September Wind Speed in Haines

The chart displays monthly wind speed patterns in Haines, with values for each month shown alongside September's data, which is highlighted for easy comparison. It illustrates the average wind speed, offering insights into how September's wind conditions compare to the rest of the year.
JanFebMarAprMayJunJulAugSepOctNovDec1.21.31.21.11.11.31.41.71.5 m/s1.11.21.2
Data source: Haines September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Haines Compares to Other Months

The weather in Haines 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 Haines and find detailed weather information for every month.

In September, the weather presents a mild transition from summer to autumn, with temperatures ranging from a chilly -5°C (24°F) at night to a pleasant maximum of 23°C (73°F) during the day. Rainfall is significant, with 222 mm (8.7 in) of precipitation spread over 18 days, contributing to a high humidity level of 105%. In contrast, January offers a starkly colder atmosphere, with temperatures dropping to a minimum of -28°C (-19°F) and averaging around -7°C (20°F) during the day. Although January experiences slightly higher precipitation at 249 mm (9.8 in) over 16 days, the humidity is lower at 94%, making for a noticeably drier cold. For a more detailed look at weather conditions in January, you can visit Haines weather in January.

In comparing the weather between September and February, there is a stark contrast in temperatures and overall climate conditions. September experiences milder temperatures, ranging from a minimum of -5°C (24°F) to a maximum of 23°C (73°F), with an average temperature of 9°C (49°F). However, it also sees considerable precipitation, totaling 222 mm (8.7 in) over 18 days, paired with high humidity levels reaching 105%. In contrast, February is much colder, with temperatures dropping between a low of -30°C (-22°F) and a high of just 5°C (42°F), averaging -9°C (17°F). The month has less overall precipitation at 161 mm (6.3 in) over 12 days, along with a lower humidity level of 90%. For more specific details regarding February weather patterns, you can visit Haines weather in February.

September and March present distinctly different weather patterns. In September, temperatures vary from a minimum of -5°C (24°F) to a maximum of 23°C (73°F), with an average of 9°C (49°F). Despite being relatively mild, September experiences significant precipitation, totaling 222 mm (8.7 in) over 18 days, accompanied by high humidity at 105%. In contrast, March is much colder, with temperatures ranging from a chilly -24°C (-11°F) to a milder 10°C (50°F), and an average temperature of -4°C (25°F). The month sees less precipitation at 188 mm (7.4 in) over 17 days, but the humidity remains notably lower at 93%. For a closer look at what to expect, you can explore Haines weather in March.

September weather is noticeably milder compared to April, with average temperatures ranging from -5°C (24°F) to a comfortable maximum of 23°C (73°F). In contrast, April sees colder conditions, with temperatures ranging from a minimum of -17°C (2°F) to a maximum of 12°C (54°F), resulting in an average of just 1°C (33°F). While September experiences higher precipitation levels at 222 mm (8.7 in) over 18 days, April has less rainfall at 150 mm (5.9 in) across 16 days. Additionally, September's humidity peaks at a challenging 105%, while April maintains a lower humidity level of 93%. For more details, you can check Haines weather in April.

September and May present contrasting weather patterns, with September generally experiencing milder temperatures. In September, the temperature ranges from a minimum of -5°C (24°F) to a comfortable maximum of 23°C (73°F), averaging around 9°C (49°F). However, it also sees more precipitation, with 222 mm (8.7 in) spread over 18 days, contributing to a high humidity of 105%. In contrast, May exhibits cooler temperatures, with a minimum of -7°C (21°F) and a maximum of 18°C (65°F), averaging at 5°C (41°F). Precipitation in May is lower, totaling 150 mm (5.9 in) over the same number of days, resulting in a slightly lower humidity of 92%. For more detailed information, visit Haines weather in May.

September weather tends to be cooler than June, with average temperatures ranging from a minimum of -5°C (24°F) to a maximum of 23°C (73°F), compared to June's temperatures that vary from -4°C (25°F) to a warmer peak of 28°C (82°F). Additionally, September experiences significantly more rainfall, with 222 mm (8.7 in) of precipitation over 18 days, while June has lower precipitation levels at 141 mm (5.6 in) across 20 days. Humidity is also notably higher in September, reaching 105%, compared to June's 100%. For a detailed look at the weather in June, visit Haines weather in June.

When comparing the weather in September to that of July, it's evident that September experiences a broader temperature range, with minimums dipping to -5°C (24°F) and maximums reaching 23°C (73°F). In contrast, July tends to be milder, with minimum temperatures of 6°C (43°F) and maximums peaking at 27°C (81°F). Precipitation is significantly higher in September, totaling 222 mm (8.7 in) over 18 days, while July sees less moisture, with 109 mm (4.3 in) over 16 days. Humidity levels are slightly higher in July at 110%, compared to September's 105%. For more detailed information on July weather, you can check out Haines weather in July.

In comparing the weather between September and August, it's evident that September experiences cooler temperatures, with a minimum of -5°C (24°F) and an average of 9°C (49°F), while August boasts warmer conditions, with a minimum of 4°C (40°F) and an average of 13°C (55°F). Additionally, September has slightly less precipitation at 222 mm (8.7 in) over 18 days, compared to August's 227 mm (8.9 in) over 20 days. Humidity levels are also higher in August at 117% compared to 105% in September. For more detailed insights, you can refer to Haines weather in August.

September and October present notably contrasting weather conditions. In September, temperatures range from a minimum of -5°C (24°F) to a maximum of 23°C (73°F), with an average of 9°C (49°F). The month experiences significant rainfall, with 222 mm (8.7 in) spread over 18 days and a high humidity level of 105%. Conversely, October brings a sharper chill, with minimum temperatures dropping to -15°C (5°F) and an average of just 1°C (35°F), while the maximum reaches only 12°C (54°F). Precipitation increases to 318 mm (12.5 in) over 22 days, and humidity remains elevated at 98%. For a deeper dive into October's weather specifics, check out Haines weather in October.

September weather features a milder temperature range with a minimum of -5°C (24°F) and an average of 9°C (49°F), peaking at a maximum of 23°C (73°F). In contrast, November sees a significant drop in temperatures, with a minimum of -23°C (-10°F) and an average of -5°C (24°F), only reaching a maximum of 6°C (42°F). Precipitation levels also differ; September experiences 222 mm (8.7 in) over 18 days, while November has higher precipitation at 276 mm (10.9 in) over 20 days. Despite the decrease in humidity from 105% in September to 96% in November, the colder temperatures make November feel much more frigid. For detailed insights on the weather conditions in November, refer to Haines weather in November.

In September, the weather tends to be milder with average temperatures ranging from a minimum of -5°C (24°F) to a maximum of 23°C (73°F), while December is significantly colder, featuring a range from -22°C (-8°F) to a maximum of just 7°C (45°F). September experiences considerable rainfall, accumulating 222 mm (8.7 in) over 18 days, whereas December sees even more precipitation at 363 mm (14.3 in) over 23 days, underscoring the wetter winter conditions. Humidity levels are also high in both months, with September reaching a staggering 105% and December at 95%. This stark contrast in temperatures and precipitation makes December a notably harsher month compared to the relatively warmer September. For more insights into what to expect, you can check Haines weather in December.

Compare Haines's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Haines

As September rolls in, Haines experiences a dramatic shift in weather, transitioning from the warmth of summer to the crispness of fall. With temperatures dipping to a comfortable average of 9°C (49°F) and even dropping as low as -5°C (24°F) at night, this month marks the onset of cooler days. The abundant rainfall, with 222 mm (8.7 in) over 18 days, adds a refreshing yet damp element to the air, resulting in a unique blend of moisture that sets this month apart. Humidity levels soar to an impressive 105%, creating a lush, vibrant environment that contrasts sharply with the drier summer months. For those keen to explore Haines' enchanting climate, more insights can be found at Haines Climate.