September Weather in Marfa, United States

Last updated: February 24, 2025

In Marfa, United States, September showcases a dynamic climate, with temperatures ranging from a pleasant 7°C (46°F) at night to a peak of 35°C (95°F) during the day. The average temperature settles around a comfortable 23°C (73°F), making it an inviting time for outdoor activities. While residents and visitors can expect 74% humidity, it contributes to the unique atmosphere of this artistic enclave. Rainfall is relatively modest, with 47 mm (1.9 in) occurring over 8 days, offering refreshing breaks in between sunny skies. This blend of warmth and occasional showers creates a vibrant backdrop for exploring Marfa's rich cultural landscape.

September Temperature in Marfa

In September, Marfa experiences a delightful transition towards autumn, with temperatures showcasing a pleasing range. The month begins with a chilly minimum of 7°C (46°F), but quickly warms up to an average of 23°C (73°F), peaking at a comfortable 35°C (95°F). This blend of cooler nights and warm afternoons offers a refreshing escape from the intense summer heat, mirroring the broader seasonal shift. As the days gradually shorten, the welcoming warmth lingers, creating a perfect climate for exploring the unique landscape and artistic charm that Marfa is renowned for. The steady drop in temperatures from the sweltering summer months signals a change in the local atmosphere, inviting visitors to enjoy outdoor activities against a backdrop of stunning autumnal skies.

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

The chart illustrates September temperature patterns in Marfa, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec455159667479797873655548
Data source: Temperature data for Marfa 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 Marfa

In September, Marfa experiences a notable uptick in precipitation, receiving 47 mm (1.9 in) of rain over about 8 days. This increase marks the peak of the wet season, following a steady rise in rainfall throughout the summer. After months of escalating moisture, particularly during August with 40 mm (1.6 in), the arrival of fall brings a refreshing shift in the landscape, as the desert transforms under the nourishing showers. This trend hints at a transitional climate, where the once parched terrain welcomes the rains, rejuvenating both flora and fauna as temperatures gradually cool. September’s rainfall sets the stage for the drier months ahead, providing a vital reprieve before the arid winter settles in.

September Precipitation Trends in Marfa

The chart displays monthly precipitation patterns in Marfa, 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.
JanFebMarAprMayJunJulAugSepOctNovDec13101212153130404721820
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Marfa

September in Marfa sees a return to relatively high humidity levels, averaging 74%, a slight rise from the summer months. After hitting a peak of 70% in July and 67% in August, the humidity in September suggests the onset of autumnal changes. This pattern reflects a gradual increase as the year progresses, with humidity consistently climbing from 61% in April to an expected 85% in December. The transition into fall is marked by this uptick, indicating a shift in the atmospheric conditions that characterize Marfa's unique desert climate. As the year winds down, residents and visitors alike can anticipate a cozy environment influenced by these rising moisture levels.

September Average Humidity in Marfa

This chart illustrates the average monthly humidity levels in Marfa, 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.
JanFebMarAprMayJunJulAugSepOctNovDec76%74%63%61%68%70%70%67%74%75%84%85%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Marfa

As September rolls into Marfa, the UV Index stands at a striking 11, categorizing sun exposure as extreme. This month, sun-seekers can expect a burn time of just 10 minutes, underscoring the need for vigilant sun protection. Following a summertime trend of sustained extreme UV levels, September slightly dips from the peak of 13 seen from April through August, yet it remains a reminder of the harsh sun conditions typical for the region. With the UV Index beginning to transition downwards toward the fall months, there’s still plenty of sunshine to enjoy, but caution is key. For more detailed information about UV levels and safety precautions, visit Marfa UV Index.

Maximum UV Index Levels in Marfa for September

The chart shows the monthly maximum UV Index (UVI) for Marfa 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.
JanFebMarAprMayJunJulAugSepOctNovDec6810131313131211975
Data source: Marfa 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 Marfa

As September unfolds in Marfa, the warmth of summer lingers, offering a generous 303 hours of sunshine—a delightful transition as the days begin to shorten. This month stands as a graceful descent from the peak of July, which boasts the highest sunlight at 365 hours. Following August’s robust 345 hours, September maintains a vibrant glow, creating perfect conditions for outdoor exploration amidst the vast desert landscape. While October signals a slight dip with 294 hours, September's ample sunshine assures that Marfa continues to bask in its radiant charm, making it an enticing time for visitors to experience the unique blend of art and nature that defines this Texas gem.

Monthly Sunshine Duration in Marfa: September Highlighted

The September sunshine duration represents the total number of hours Marfa 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.
JanFebMarAprMayJunJulAugSepOctNovDec215h248h295h320h359h355h365h345h303h294h266h262h
Data source: Marfa September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Marfa During September

September in Marfa, United States, offers a promising chance of sunshine, with an impressive 71% likelihood of clear skies. This month stands out as a transition period, following the hot summer months of July and August, where the chance of sun dips to 65% and 51% respectively. As autumn approaches, the weather becomes more inviting, resembling earlier spring months like March, which boasts a noteworthy 75% chance of sun. Overall, September's sunny disposition makes it an ideal time for outdoor activities, continuing the trend of favorable weather that peaks again in October with a 78% likelihood.

Percentage of Sunny Days in September in Marfa

The chart illustrates the percentage of sunny days in Marfa 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 Marfa experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec74%63%75%60%70%62%65%51%71%78%68%60%
Data source: Marfa September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Marfa in September

As summer fades into autumn, September in Marfa, United States marks a gentle transition in daylight hours. With approximately 12 hours of daylight, the month signals a soft decline from the sun-drenched days of summer, where June reached its peak with 14 hours. This gradual decrease subtly mirrors the rhythm of the seasons, allowing residents and visitors to enjoy the lingering warmth of daylight while preparing for the cooler months ahead. The progression from the 13-hour days of July and August to September's 12 hours underscores the enchanting cycle of nature, inviting both reflection and appreciation for the stunning landscapes that Marfa uniquely offers.

Average Daylight Hours in Marfa for September

The chart illustrates the variation in daylight duration in Marfa throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec10h 25m11h 7m12h12h 55m13h 41m14h 3m13h 51m13h 10m12h 18m11h 23m10h 36m10h 12m
Data source: Marfa daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Marfa

As summer gives way to autumn, September winds in Marfa experience a slight shift, with an average speed of 3.2 m/s (7 mph). This marks a gentle drop from the more vigorous breezes of the spring months, where speeds peaked at 5.0 m/s (11 mph) in March. The transition hints at the cooling temperatures ahead, as the winds continue their waltz down from the summer lows of 3.0 m/s (7 mph) in August. Despite the softer gusts, September retains a refreshing charm, inviting both locals and visitors to bask in the serene, whispering air that embodies the essence of Marfa’s unique desert landscape.

Average September Wind Speed in Marfa

The chart displays monthly wind speed patterns in Marfa, 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.
JanFebMarAprMayJunJulAugSepOctNovDec3.93.85.04.74.64.03.33.03.2 m/s3.63.33.8
Data source: Marfa September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Marfa Compares to Other Months

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

September and January present strikingly different weather patterns. In September, temperatures range dramatically from a cool minimum of 7°C (46°F) to a scorching maximum of 35°C (95°F), with an average of 23°C (73°F). In contrast, January's temperatures are much colder, ranging from a frigid -14°C (7°F) at night to a mild 25°C (77°F) during the day, resulting in an average of 7°C (46°F). Precipitation is notably higher in September, with 47 mm (1.9 in) over about 8 days, while January sees much less, with only 13 mm (0.5 in) and rain on around 2 days. Humidity levels remain fairly consistent, with September at 74% and January slightly higher at 76%. For more detailed information, you can visit Marfa weather in January.

September and February present contrasting weather patterns. September boasts warmer temperatures, with an average of 23°C (73°F) and highs reaching up to 35°C (95°F), while February's average is considerably cooler at 10°C (51°F), with a minimum temperature plummeting to -14°C (7°F). In terms of precipitation, September experiences more rain with 47 mm (1.9 in) over about 8 days, compared to February’s minimal 10 mm (0.4 in) over just 2 days. Interestingly, both months share the same humidity level of 74%, creating a unique atmospheric feel regardless of the season. For further details on February weather patterns, you can check Marfa weather in February.

September and March exhibit significantly different weather patterns. In September, temperatures can rise to a maximum of 35°C (95°F) with an average of 23°C (73°F), while March shows a cooler range with a maximum of 32°C (90°F) and an average of 15°C (59°F). September tends to be more humid with a humidity level of 74% compared to March, which has a lower humidity of 63%. Additionally, September experiences more precipitation, with 47 mm (1.9 in) across 8 days, while March is relatively dry, receiving only 12 mm (0.5 in) over just 1 day. For more detailed information, you can check Marfa weather in March.

September and April showcase distinct weather patterns, highlighting the transition between seasons. September typically features warmer temperatures, with a minimum of 7°C (46°F) and an average of 23°C (73°F) soaring to a maximum of 35°C (95°F). In contrast, April starts cooler, with a minimum of 1°C (35°F) and an average of 19°C (67°F), while peaking at a maximum of 33°C (91°F). Precipitation is more frequent in September, averaging 47 mm (1.9 in) over 8 days, compared to April's milder 12 mm (0.5 in) over just 2 days. Additionally, September exhibits higher humidity at 74%, whereas April's humidity is comparatively lower at 61%. For more detailed insights into the weather during April, you can visit Marfa weather in April.

When comparing the weather in September and May, notable differences emerge in both temperature and precipitation patterns. September experiences a wider temperature range, with minimums around 7°C (46°F) and maximums reaching up to 35°C (95°F), while May boasts slightly lower minimum temperatures at 3°C (37°F) but can peak at an impressive 37°C (99°F) on hotter days. Additionally, September sees more precipitation, averaging 47 mm (1.9 in) over about 8 days, compared to May's milder 15 mm (0.6 in) spread over just 3 days. Humidity levels also differ slightly, with September being more humid at 74% versus May's 68%. For a more detailed look at May weather specifically, check out Marfa weather in May.

When comparing the weather in September to June, several distinct differences emerge. September experiences a broader range of temperatures, with minimums dipping to 7°C (46°F) and maximums reaching up to 35°C (95°F), while June's temperatures are warmer overall, ranging from a minimum of 13°C (56°F) to a maximum of 39°C (103°F). Additionally, September has a higher average temperature of 23°C (73°F) compared to June's 26°C (80°F). Precipitation is slightly more prevalent in September with 47 mm (1.9 in) over 8 days, while June sees slightly less rain at 31 mm (1.2 in) over 7 days. Both months feature relatively high humidity levels, but September has a slightly higher average at 74% compared to June's 70%. For more details, check out Marfa weather in June.

When comparing the weather in September and July, it’s clear that July typically experiences higher temperatures, with minimums around 16°C (61°F) and maximums reaching up to 39°C (102°F), contrasted with September's cooler range of 7°C (46°F) to 35°C (95°F). The average temperature in July is also warmer at 26°C (79°F) compared to September's 23°C (73°F). Precipitation is slightly higher in September at 47 mm (1.9 in) over 8 days, while July sees less rain, totaling 30 mm (1.2 in) over 7 days. Humidity levels are comparable, with September at 74% and July at 70%. For more details on July weather, you can visit Marfa weather in July.

In September, temperatures range from a minimum of 7°C (46°F) to a maximum of 35°C (95°F), with an average of 23°C (73°F). This is a notable decrease compared to August, where the temperatures are generally higher, with a minimum of 13°C (57°F), an average of 26°C (78°F), and a maximum of 38°C (100°F). Additionally, September experiences slightly more precipitation, at 47 mm (1.9 in) over 8 days, compared to August's 40 mm (1.6 in) over 9 days. Humidity levels are also higher in September at 74%, compared to 67% in August. For more detailed information on August weather, you can visit Marfa weather in August.

September typically presents warmer temperatures, with daily averages reaching up to 23°C (73°F) and maximums soaring to 35°C (95°F), while experiencing a significant amount of precipitation over 8 days. In contrast, October sees a notable drop in minimum temperatures, plunging to -5°C (24°F), although the average remains mild at 18°C (65°F), with peaks reaching 32°C (90°F). The month is drier, featuring only 21 mm (0.8 in) of rain over just 4 days, along with a slight increase in humidity to 75%. For more detailed weather information, you can check Marfa weather in October.

In comparing September and November weather, September typically offers warm temperatures with an average of 23°C (73°F) and a maximum that can soar up to 35°C (95°F). The month also sees a significant amount of humidity at 74% and approximately 47 mm (1.9 in) of precipitation across 8 days. In contrast, November experiences much cooler conditions, with an average temperature dropping to 13°C (56°F) and a maximum of 28°C (82°F). This month also has significantly less precipitation, only 8 mm (0.3 in) over just 2 days, and a slightly higher humidity level at 84%. For a detailed look at November weather, you can visit Marfa weather in November.

The weather in September and December presents a striking contrast. In September, temperatures range from a mild 7°C (46°F) at night to a warm 35°C (95°F) during the day, accompanied by a moderate humidity of 74%. The month sees a total precipitation of 47 mm (1.9 in) over about 8 days, creating a warm and slightly wet atmosphere.

In contrast, December brings a much cooler climate, with nighttime lows dropping to -10°C (15°F) and daytime highs peaking at 25°C (77°F). The average temperature settles around 9°C (49°F). December experiences significantly less precipitation at 20 mm (0.8 in), spread over just 2 days, while the humidity rises to 85%. For more details on the weather conditions, you can visit Marfa weather in December.

Compare Marfa's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Marfa

As September rolls in, Marfa transforms into a transitional oasis between the sweltering summer and cooler autumn months. With temperatures averaging around 23°C (73°F), the days are pleasantly warm, yet the nights can dip refreshingly low, showcasing the desert's wide temperature range. This month also brings a touch of humidity, hovering around 74%, along with occasional rainfall that totals about 47 mm (1.9 in) over eight days. Unlike the blistering heat of July and August, September invites visitors to enjoy milder conditions, making it a perfect time to explore the unique landscapes and vibrant art scene of the region. Whether you're wandering under the vast Texas sky or soaking in the local culture, the September weather in Marfa provides a delightful experience that's distinct from other months. For more insights into the overall climate trends, visit Marfa Climate.