September Weather in Les Houches, France

Last updated: February 26, 2025

September in Les Houches, France offers a captivating blend of cool mountain air and vibrant autumnal hues. The average temperature hovers around 10°C (49°F), with daytime highs reaching up to 21°C (71°F), providing a comfortable atmosphere for outdoor activities. However, visitors should be prepared for the chill of nighttime, where temperatures can plummet to a brisk -8°C (19°F). With 109 mm (4.3 in) of rainfall spread across 16 days, September showcases the region's lush landscapes nourished by frequent showers. Coupled with a humidity level of 73%, the air carries a refreshing crispness that accentuates the beauty of this stunning alpine setting.

September Temperature in Les Houches

In September, Les Houches transitions gracefully from the warm embrace of summer to the crispness of autumn. With minimum temperatures hovering around -8°C (19°F), nights begin to hint at the chill to come, while the averaged warmth settles at a comfortable 10°C (49°F). Days remain pleasant, peaking at a maximum of 21°C (71°F), inviting both adventure seekers and nature lovers to bask in the stunning alpine scenery. As the month progresses, the contrast between warming days and cooling nights becomes more pronounced, offering a unique blend of invigorating mountain air and the serene beauty of the changing foliage. This captivating blend makes September a remarkable month to experience the allure of Les Houches.

September Weather in Les Houches: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Les Houches, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec182630374454575649413022
Data source: Temperature data for Les Houches generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Les Houches

In September, Les Houches experiences 109 mm (4.3 in) of precipitation over approximately 16 days, marking a notable decrease from the summer months. This decline in rainfall follows a wet May, which recorded the highest amount of precipitation at 224 mm (8.8 in). The trend highlights a transition towards autumn, as the cumulative precipitation begins to taper off from the summer peaks seen in June and July. While September remains relatively damp compared to the drier months ahead, such as October and November, it is clear that the landscape is preparing for the winter months, where precipitation sees a significant increase again by December.

September Precipitation Trends in Les Houches

The chart displays monthly precipitation patterns in Les Houches, 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.
JanFebMarAprMayJunJulAugSepOctNovDec17114117584224167162149109133120295
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Les Houches

In September, Les Houches experiences a slight rebound in humidity, averaging around 73%. This marks a subtle increase compared to the drier months of July and August, where humidity levels dipped to 72% and 63%, respectively. As summer bids farewell, the air becomes gradually more humid, preparing for the cozy, moisture-rich atmosphere of autumn. This trend continues into October, where humidity rises sharply to 89%, signaling a return to the wetter conditions typical of the colder months. The overall pattern showcases a fluctuation; as warmer months feature lower humidity, the latter part of the year is characterized by a significant increase, hinting at the seasonal shift in the region's climate.

September Average Humidity in Les Houches

This chart illustrates the average monthly humidity levels in Les Houches, 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.
JanFebMarAprMayJunJulAugSepOctNovDec91%87%84%83%78%75%72%63%73%89%91%90%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Les Houches

As September rolls into Les Houches, France, residents and visitors experience a notable drop in UV intensity compared to the peak summer months. The UV Index settles at 7, categorizing exposure as high, which indicates a burn time of approximately 25 minutes. This shift from the relentless 10 seen in July and June reminds us to remain vigilant while enjoying the great outdoors. Interestingly, as the year progresses, the trend showcases a gradual decline in UV levels from the summer peak, but warning signals are still present, particularly for those spending extended time outdoors. For more detailed insights on UV levels throughout the year, be sure to check out Les Houches UV Index.

Maximum UV Index Levels in Les Houches for September

The chart shows the monthly maximum UV Index (UVI) for Les Houches 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.
JanFebMarAprMayJunJulAugSepOctNovDec34789101097532
Data source: Les Houches 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 Les Houches

As the summer fades, September in Les Houches, France, continues to bask in the warm glow of sunshine, boasting 331 hours of radiant daylight. This marks a delightful transition from the peak of summer, where July peaked at 422 hours, to the early hints of autumn. The sun-soaked days of June and July set a vibrant backdrop, while August allows for a gentle tapering at 392 hours. What’s fascinating is how September maintains a substantial amount of sunshine, reflecting a trend of lingering warmth and light, perfect for enjoying the breathtaking alpine scenery before the days grow shorter in October, which sees a decline to 291 hours. With crisp mountain air and beautiful landscapes, September offers a perfect blend of summer's farewell and autumn's welcome, inviting visitors to experience the best of both worlds.

Monthly Sunshine Duration in Les Houches: September Highlighted

The September sunshine duration represents the total number of hours Les Houches 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.
JanFebMarAprMayJunJulAugSepOctNovDec173h237h306h352h362h397h422h392h331h291h228h202h
Data source: Les Houches September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Les Houches During September

In Les Houches, France, September brings a 30% chance of sunny weather, presenting a moderate opportunity for basking in the late summer sun. While this percentage is somewhat lower than the higher peaks of April and March—both at 44%—it's notable that the likelihood of sunshine remains more promising than in several months earlier in the year, such as January and May. The trend shows that as the seasons transition, the chances of sunny days fluctuate, hinting at the lingering warmth of summer before autumn sets in. Overall, visitors can expect a mix of sunshine and potential cloud cover, making September a delightful time to explore the stunning landscapes of the French Alps.

Percentage of Sunny Days in September in Les Houches

The chart illustrates the percentage of sunny days in Les Houches 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 Les Houches experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec22%38%44%44%26%29%33%37%30%45%38%40%
Data source: Les Houches September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Les Houches in September

As summer fades in Les Houches, September brings a gentle transition with 12 hours of daylight, creating a perfect balance between lingering warmth and the approach of autumn. The month continues the gradual decline in daylight that began after the peak 15 hours in July and June, reflecting the region's rhythmic shift from the vibrant summer. With daylight decreasing, the majestic mountains and lush landscapes are bathed in a softer glow, inviting visitors to enjoy the early autumn scenery before the days shorten further in October. This month serves as a beautiful reminder of nature's cyclical patterns, blending longer days with the crispness of fall.

Average Daylight Hours in Les Houches for September

The chart illustrates the variation in daylight duration in Les Houches throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec9h 5m10h 21m11h 56m13h 33m14h 57m15h 39m15h 17m14h 3m12h 29m10h 52m9h 26m8h 42m
Data source: Les Houches daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Les Houches

As September unfolds in Les Houches, France, the winds tenderly whisper their way through the mountains, bringing an average speed of just 1.0 m/s (2 mph). This marks the calmest month of the year, with a subtle reduction from summer's gentle breezes. Throughout the preceding months, the wind speeds have been relatively consistent, hovering around 1.1 to 1.3 m/s (3 mph). However, as autumn begins to grace the landscape, it's clear that the winds are easing, hinting at the tranquil beauty and stillness that characterize the region in the lead-up to winter. As nature prepares for the seasonal transition, the gentle September winds add a soft, serene quality to the vibrant scenery of Les Houches, inviting visitors to embrace the peaceful moments before the chill sets in.

Average September Wind Speed in Les Houches

The chart displays monthly wind speed patterns in Les Houches, 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.
JanFebMarAprMayJunJulAugSepOctNovDec1.31.41.21.21.31.11.11.21.0 m/s1.31.31.5
Data source: Les Houches September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Les Houches Compares to Other Months

The weather in Les Houches 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 Les Houches and find detailed weather information for every month.

September and January showcase vastly different weather conditions. In September, temperatures range from a minimum of -8°C (19°F) to a maximum of 21°C (71°F), with an average of 10°C (49°F). The month experiences 109 mm (4.3 in) of precipitation over 16 days, accompanied by a humidity level of 73%. In stark contrast, January brings much colder temperatures, with a minimum of -25°C (-13°F) and a maximum of just 6°C (44°F), averaging -8°C (19°F). This winter month sees increased precipitation of 171 mm (6.7 in) over only 10 days, along with higher humidity at 91%. For a closer look at January's weather specifics, visit Les Houches weather in January.

September and February present contrasting weather conditions. In September, temperatures range from a minimum of -8°C (19°F) to a comfortable average of 10°C (49°F), peaking at a pleasant 21°C (71°F). The month experiences 109 mm (4.3 in) of precipitation over 16 days, with humidity levels at 73%. In contrast, February chills with temperatures dropping to a minimum of -21°C (-5°F) and averaging -4°C (26°F), reaching a maximum of 11°C (52°F). Despite having fewer rainy days—only 11—the total precipitation is higher, at 141 mm (5.5 in), with humidity soaring to 87%. This stark difference highlights February as significantly colder and more humid than September. For those interested in specific conditions during the winter, check out Les Houches weather in February.

September and March present contrasting weather conditions. In September, temperatures range from a minimum of -8°C (19°F) to a maximum of 21°C (71°F), with an average of 10°C (49°F). The month sees 109 mm (4.3 in) of precipitation over 16 days and a humidity level of 73%. In contrast, March experiences much colder temperatures, with a minimum of -25°C (-12°F) and an average of -1°C (31°F), peaking at 14°C (58°F). This month has a higher precipitation level of 175 mm (6.9 in) over approximately 15 days, coupled with increased humidity at 84%. For more specific insights on weather conditions, you can check Les Houches weather in March.

September and April present distinct weather patterns, highlighting the transition of seasons. In September, the temperatures range from a minimum of -8°C (19°F) to a maximum of 21°C (71°F), with an average temperature of 10°C (49°F). The month experiences significant precipitation, totaling 109 mm (4.3 in) over 16 days, and a humidity level of 73%. In contrast, April brings colder conditions with temperatures dipping to a minimum of -16°C (3°F), averaging 3°C (38°F), and peaking at 17°C (63°F). Precipitation in April is slightly lower at 84 mm (3.3 in) over 13 days, but the humidity is higher at 83%. For a closer look at the specific climate patterns, check out Les Houches weather in April.

When comparing the weather in September to that of May, notable differences emerge. September tends to have milder temperatures, with a minimum of -8°C (19°F) and average highs reaching 21°C (71°F), while May showcases slightly cooler conditions, where temperatures can drop to -12°C (11°F) and peak at 23°C (74°F). Precipitation in May is significantly higher, totaling 224 mm (8.8 in) over 21 days compared to September’s 109 mm (4.3 in) on 16 days. Additionally, May has a higher humidity level at 78%, compared to September's 73%. For further details on May weather, you can check Les Houches weather in May.

When comparing the weather in September and June, several notable differences emerge. September tends to have a cooler temperature range, with a minimum of -8°C (19°F) and an average of 10°C (49°F), while June features milder temperatures, starting at -3°C (28°F) and reaching an average of 12°C (54°F). The maximum temperatures in June can soar to 28°C (83°F), whereas September's peak is a more moderate 21°C (71°F). While both months experience significant precipitation, June is generally wetter, receiving 167 mm (6.6 in) of rainfall over 20 days compared to September's 109 mm (4.3 in) over 16 days. Humidity levels are fairly comparable, with September at 73% and June slightly higher at 75%. For more detailed information on the weather, you can check Les Houches weather in June.

When comparing the weather in September and July, notable differences emerge. In September, temperatures range from a chilly minimum of -8°C (19°F) to a more moderate maximum of 21°C (71°F), averaging around 10°C (49°F). In contrast, July boasts warmer conditions with minimum temperatures of 2°C (36°F) and a maximum of 27°C (81°F), resulting in an average of 14°C (57°F). Precipitation also varies between the months, with September receiving 109 mm (4.3 in) over 16 days, while July experiences heavier rainfall, totaling 162 mm (6.4 in) across 18 days. Both months have similar humidity levels, hovering around 72-73%. To get a closer look at the weather specifics for July, check out Les Houches weather in July.

In comparing the weather of September to that of August, September tends to be cooler, with average temperatures ranging from a minimum of -8°C (19°F) to a maximum of 21°C (71°F), while August has warmer averages with a minimum of 2°C (36°F) and a maximum of 25°C (77°F). Additionally, September experiences slightly higher precipitation at 109 mm (4.3 in) over 16 days, compared to August's 149 mm (5.9 in) over 17 days. Humidity levels in September are notably higher at 73%, compared to August's 63%. For more details on August weather patterns, visit Les Houches weather in August.

September and October exhibit distinct weather patterns, with October generally feeling cooler and wetter. In September, temperatures range from a minimum of -8°C (19°F) to a maximum of 21°C (71°F), with an average around 10°C (49°F) and 109 mm (4.3 in) of precipitation over 16 days, yielding a humidity level of 73%. In contrast, October sees a decline in average temperatures to 5°C (42°F) while maintaining the same minimum of -8°C (18°F), and a maximum of 18°C (65°F). The month also records an increase in precipitation to 133 mm (5.3 in) over just 13 days, along with higher humidity at 89%. For a detailed look at weather specifics and trends, check Les Houches weather in October.

In September, the weather in Les Houches tends to be milder, with average temperatures around 10°C (49°F) and daytime highs reaching up to 21°C (71°F). The humidity sits at a moderate 73%, and the month experiences about 109 mm (4.3 in) of precipitation over 16 days. In contrast, November brings a significant drop in temperatures, with averages plummeting to -1°C (30°F) and a maximum of 15°C (60°F); notably, nighttime lows can reach as low as -18°C (-1°F). Precipitation increases slightly to 120 mm (4.7 in), but it falls over fewer days, totaling only 13. Additionally, November's humidity is higher at 90%, contributing to a chillier atmosphere. For more detailed climate insights, check out Les Houches weather in November.

In September, the weather is pleasantly mild with temperatures ranging from a minimum of -8°C (19°F) to a maximum of 21°C (71°F) and an average of 10°C (49°F). The month experiences an average of 16 days of precipitation, accumulating to 109 mm (4.3 in), with a humidity level of 73%. In stark contrast, December sees much colder conditions, with temperatures plummeting to a minimum of -23°C (-8°F) and an average of -6°C (22°F), reaching a maximum of 8°C (46°F). This month also brings increased precipitation, totaling 295 mm (11.6 in) over 19 days, and a higher humidity level of 90%. For more detailed insights, check out Les Houches weather in December.

Compare Les Houches's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Les Houches

September in Les Houches brings a delightful transformation as summer gradually cedes to autumn. With temperatures fluctuating from chilly lows to mild highs, this month stands out with its crisp, refreshing air and vibrant foliage. While the average temperature hovers around a cool 10°C, occasional sunny days can still reach a pleasant maximum of 21°C. However, September is also characterized by higher humidity and increased rainfall, contributing to the lush landscapes that surround the area. As the month unfolds, visitors can expect a charming blend of sunny days and gentle precipitation, making it a unique and picturesque time to experience the beauty of the Alps. To learn more about what to expect year-round, check out Les Houches Climate.