September Weather in Mobile, United States

Last updated: February 24, 2025

In Mobile, Alabama, September showcases a climate that balances warmth and occasional rain, reflecting the charm of late summer. With maximum temperatures soaring to 36°C (98°F) and an average of 26°C (79°F), outdoor activities are best enjoyed in the cooler parts of the day, while evenings descend into a comfortable 14°C (58°F). The month brings about 148 mm (5.8 in) of precipitation over 13 days, contributing to the region's lush greenery and high humidity levels, averaging around 80%. This combination creates a vibrant, yet humid atmosphere, typical of the Gulf Coast, making September a dynamic month for residents and visitors alike.

September Temperature in Mobile

In Mobile, Alabama, September marks a transition into the cooler months, bringing temperatures that average around 26°C (79°F), while reaching highs of 36°C (98°F). As summer gradually fades, the minimum temperature settles at a comfortable 14°C (58°F), offering a pleasant reprieve from the heat of August. This month serves as a precursor to the fall, showing a notable shift from July and August’s sweltering peaks and setting the stage for even cooler October days. The overall trend highlights Mobile's warm climate, with September providing a gentle introduction to the milder temperatures that lie ahead.

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

The chart illustrates September temperature patterns in Mobile, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec535863677580828279736056
Data source: Temperature data for Mobile 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 Mobile

In September, Mobile experiences a notable transition in its precipitation patterns, receiving an average of 148 mm (5.8 in) of rain over about 13 days. This marks a shift from the heavy rain seen in the summer months, especially August, which recorded the highest precipitation level of the year at 191 mm (7.5 in). As the city moves from the sweltering summer heat into the milder fall temperatures, September's rainfall begins to taper off compared to the 19 days of rainfall in June and 21 days in July. This moderate precipitation level signals a gradual end to the wet season, allowing residents to enjoy clearer skies and cooler weather while still anticipating those refreshing showers. Overall, September serves as a bridge between the lush summer rains and the drier fall period ahead.

September Precipitation Trends in Mobile

The chart displays monthly precipitation patterns in Mobile, 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.
JanFebMarAprMayJunJulAugSepOctNovDec95989612213922515219114811859131
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Mobile

In September, Mobile, Alabama experiences a humidity level of 80%, which aligns closely with the consistency observed throughout the summer months. The late summer's lingering warmth can be felt as the humidity begins to stabilize after a slight dip in June and July. This trend highlights a gradual increase from May’s 73%, suggesting a return to the more humid conditions typical in the region as fall approaches. As Mobile transitions into October, humidity levels are expected to drop further, but September remains a reminder of the sticky summer heat that characterizes the Gulf Coast climate. The overall trend showcases a cycle of humidity that peaks in the fall months before escalating again in winter, making this time of year both a transition and a reflection of the regional climate dynamics.

September Average Humidity in Mobile

This chart illustrates the average monthly humidity levels in Mobile, 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.
JanFebMarAprMayJunJulAugSepOctNovDec82%80%80%78%73%71%79%78%80%76%83%87%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Mobile

As September rolls into Mobile, United States, the UV Index hovers at a notable 10, classified as very high, with a burn time of just 15 minutes. This marks a slight decline from the peak extremes witnessed in the summer months, particularly July and August, which both held a consistent index of 12. The trend throughout the year showcases a general rise to extreme levels during the hotter summer months, ensuring that residents and visitors should remain vigilant about sun exposure. Following September, the UV Index will decrease further, dropping to 8 in October, maintaining a very high exposure category. As the season shifts, it’s essential to stay informed and protected; for more details on UV forecasts and precautions, check out Mobile UV Index.

Maximum UV Index Levels in Mobile for September

The chart shows the monthly maximum UV Index (UVI) for Mobile 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.
JanFebMarAprMayJunJulAugSepOctNovDec589111111121210864
Data source: Mobile 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 Mobile

September in Mobile, United States, basks in 275 hours of sunshine, marking a delightful transition into the autumn season. As the year progresses, it's clear that Sunshine is abundant during the warmer months, with May leading the way at 319 hours. Following closely are July and August, boasting 314 and 301 hours, respectively. September, while slightly diminishing from the summer peak, still enjoys generous daylight compared to earlier months like January, which only sees 174 hours. This trend underscores a consistent pattern of increasing sunshine from winter through summer, creating a vibrant and bright environment that invites outdoor activities before the chill of autumn truly sets in. As Mobile's sunlight begins to wane in the subsequent months, September stands out as a perfect blend of warmth and radiance.

Monthly Sunshine Duration in Mobile: September Highlighted

The September sunshine duration represents the total number of hours Mobile 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.
JanFebMarAprMayJunJulAugSepOctNovDec174h197h262h285h319h286h314h301h275h274h257h212h
Data source: Mobile September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Mobile During September

In Mobile, Alabama, the likelihood of enjoying sunny weather in September stands at 45%, making it a favorable time for outdoor activities as summer wanes. This percentage reflects a slight uptick from the peak summer months, where July and August see their chances drop to 26% and 35%, respectively. As we transition into fall, the likelihood of sunshine remains steady through September and October, both at 45%, before climbing to 68% in November. This trend indicates a return to brighter days as the temperatures begin to cool, creating an ideal environment for those looking to bask in the sun before winter sets in. Overall, September offers a pleasantly moderate opportunity for sunshine amid the changing seasons.

Percentage of Sunny Days in September in Mobile

The chart illustrates the percentage of sunny days in Mobile 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 Mobile experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec46%43%38%51%41%30%26%35%45%45%68%44%
Data source: Mobile September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Mobile in September

As summer transitions into fall in Mobile, Alabama, September presents a gentle tapering of daylight hours, offering about 12 hours of sunlight each day. This gradual decline follows a peak in June, when the days stretch to a vibrant 14 hours. From April through August, daylight remains robust, with 12 to 13 hours illuminating the longer days of summer. However, as September approaches, there's a noticeable shift, hinting at the impending cozy vibes of autumn. The trend of shortening days continues into October, leaving residents to embrace the softer light and the gradual approach of cooler temperatures. This rhythm of daylight is a reminder of nature's cyclical beauty, urging Mobile's inhabitants to relish the warm hues of early fall before the daylight dips further in the months ahead.

Average Daylight Hours in Mobile for September

The chart illustrates the variation in daylight duration in Mobile throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec10h 24m11h 6m12h12h 56m13h 42m14h 5m13h 52m13h 11m12h 18m11h 22m10h 35m10h 11m
Data source: Mobile daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Mobile

As September arrives in Mobile, the breezy embrace of summer begins to fade, with average wind speeds dipping to 2.3 m/s (5 mph). This gentle zephyr is part of a noticeable trend; throughout the summer months, winds have been at their calmest, peaking in July at just 2.0 m/s (4 mph), before only slightly increasing in August. Comparatively, early autumn sees winds remain mild, making September a perfect time to enjoy the subtler outdoor moments as the city transitions into the cooler months. Looking ahead, October offers a slight uptick to 2.7 m/s (6 mph) and November continues this trend of subtle breezes, indicating a gradual return to more vigorous wind patterns as winter approaches.

Average September Wind Speed in Mobile

The chart displays monthly wind speed patterns in Mobile, 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.
JanFebMarAprMayJunJulAugSepOctNovDec3.43.73.73.23.43.02.02.52.3 m/s2.72.93.2
Data source: Mobile September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Mobile Compares to Other Months

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

September and January present strikingly different weather conditions. In September, temperatures range from a mild 14°C (58°F) at night to a scorching 36°C (98°F) during the day, accompanied by significant rainfall totaling 148 mm (5.8 in) over approximately 13 days, reflecting the lingering warmth of summer and high humidity at 80%. Conversely, January brings a cool, crisp climate, with daytime highs averaging 12°C (53°F) and nighttime lows plunging to -6°C (21°F). Precipitation drops to 95 mm (3.7 in) across about 8 days, while humidity slightly increases to 82%. For more details, you can check out the Mobile weather in January.

September and February present quite distinct weather profiles, despite both being marked by high humidity levels at 80%. September typically sees warmer temperatures, with a minimum of 14°C (58°F) and an average of 26°C (79°F), peaking at a maximum of 36°C (98°F). In contrast, February experiences much cooler temperatures, with lows dropping to -5°C (24°F) and an average of 15°C (59°F), maxing out at 26°C (79°F). Additionally, September is wetter, with 148 mm (5.8 in) of precipitation over 13 days, while February has less, totaling 98 mm (3.9 in) across 12 days. For more detailed insights on February weather, check out Mobile weather in February.

September and March exhibit contrasting weather patterns, reflecting the transition from summer to fall and winter to spring, respectively. In September, temperatures range from a minimum of 14°C to a maximum of 36°C, with an average of 26°C, creating a warm atmosphere characterized by high humidity at 80%. The month also sees significant rainfall, totaling 148 mm over 13 days. In contrast, March presents a cooler climate, with temperatures ranging from a chilly 1°C to a maximum of 30°C and an average of 17°C. This month experiences less precipitation, totaling 96 mm over 10 days, while maintaining the same humidity level of 80%. For further details, you can explore Mobile weather in March.

In September, temperatures range from a minimum of 14°C (58°F) to a scorching maximum of 36°C (98°F), with an average of 26°C (79°F). The month also sees considerable precipitation, totaling 148 mm (5.8 in) over approximately 13 days, alongside high humidity levels around 80%. In contrast, April offers milder temperatures, with a minimum of 6°C (42°F) and a maximum of 30°C (87°F), averaging 20°C (68°F). While it experiences slightly less precipitation at 122 mm (4.8 in) over about 10 days, humidity remains similarly high at 78%. For more detailed insights, you can check the Mobile weather in April.

September and May present distinct weather patterns that reflect the transition of seasons. In September, temperatures range from a minimum of 14°C (58°F) to a sweltering maximum of 36°C (98°F), with an average temperature of 26°C (79°F). The month also sees considerable precipitation at 148 mm (5.8 in) over about 13 days, coupled with high humidity levels around 80%. In contrast, May features slightly cooler temperatures, with a minimum of 10°C (50°F), an average of 24°C (76°F), and a maximum of 34°C (93°F). Precipitation in May is slightly less, totaling 139 mm (5.5 in) over about 10 days, and the humidity is a bit lower at 73%. These differences highlight September’s humidity and rainfall compared to the milder and drier conditions of May. For more detailed weather information for May, check out Mobile weather in May.

When comparing the weather of September and June, September showcases slightly warmer average temperatures, with a minimum of 14°C (58°F) and an average of 26°C (79°F), peaking at 36°C (98°F). In contrast, June experiences a minimum temperature of 17°C (64°F) and an average of 27°C (80°F), with a maximum of 35°C (95°F). Precipitation is notably higher in June, amounting to 225 mm (8.9 in) over 19 days, compared to September's 148 mm (5.8 in) across 13 days. Additionally, September tends to be more humid at 80%, whereas June sits at a lower 71%. For more detailed insights, check out Mobile weather in June.

When comparing the weather in September and July, it’s clear that both months experience high temperatures, with maximums reaching up to 36°C (98°F). However, September tends to have a lower minimum temperature of 14°C (58°F) compared to July’s warmer minimum of 22°C (72°F), making September feel more mild overall. Additionally, September is characterized by slightly higher precipitation levels at 148 mm (5.8 in), occurring over 13 days, while July sees 152 mm (6.0 in) across 21 days of rain. Interestingly, humidity levels remain comparable, with September at 80% and July at 79%. For those interested in the specifics of July weather, more information can be found here: Mobile weather in July.

In comparing the weather of September and August, September generally offers slightly cooler temperatures, with an average of 26°C (79°F) compared to August's 28°C (82°F). The maximum temperatures are similar, with August reaching up to 37°C (98°F) and September peaking at 36°C (98°F). However, September experiences more frequent rainfall, with 148 mm (5.8 in) over 13 days, while August sees 191 mm (7.5 in) spread across 22 days. Humidity levels are also comparable, with September at 80% and August at 78%. For more detailed information, you can check Mobile weather in August.

September and October exhibit significant changes in weather conditions. In September, temperatures range from a minimum of 14°C (58°F) to a high of 36°C (98°F), with an average of 26°C (79°F). The month experiences considerable rainfall totaling 148 mm (5.8 in) over 13 days, accompanied by high humidity at 80%.

In contrast, October sees cooler temperatures, with a minimum of 5°C (41°F) and a maximum of 35°C (96°F), averaging 23°C (73°F). Rainfall decreases to 118 mm (4.7 in) spread over 9 days, and humidity also slightly lowers to 76%. Overall, October presents a transition towards cooler and drier conditions. For more details on the weather, check out Mobile weather in October.

September and November weather present a stark contrast. In September, temperatures range from a minimum of 14°C (58°F) to a scorching maximum of 36°C (98°F), with an average of 26°C (79°F). The month is quite wet, experiencing 148 mm (5.8 in) of precipitation over 13 days, accompanied by high humidity levels of 80%. In contrast, November sees much cooler temperatures, with a minimum of -2°C (29°F), an average of 15°C (60°F), and a maximum of 27°C (82°F). Precipitation drops significantly to 59 mm (2.3 in) over just six days, and humidity slightly increases to 83%. For more detailed weather insights, check out Mobile weather in November.

In September, the weather is notably warmer, with average temperatures reaching around 26°C (79°F) and highs soaring up to 36°C (98°F). The month also experiences a significant amount of rainfall, totaling 148 mm (5.8 in) over 13 days, combined with high humidity levels of 80%. In contrast, December brings much cooler temperatures, with an average of 13°C (56°F) and a maximum of 26°C (80°F), while the minimum dips down to -1°C (30°F). Precipitation in December averages 130 mm (5.1 in) over 11 days, and humidity is slightly higher at 87%. For a more detailed look at weather conditions, visit Mobile weather in December.

Compare Mobile's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Mobile

As September unfolds in Mobile, it presents a unique blend of warmth and moisture, differentiating it from the sweltering heat of summer months. While temperatures still reach a maximum of 36°C (98°F), the average drops to a more comfortable 26°C (79°F), signaling the gradual shift towards autumn. However, the month is characterized by frequent rain, with 13 days of precipitation contributing to a substantial 148 mm (5.8 in), and humidity levels remaining high at around 80%. This combination brings a tropical feel to the air, setting September apart as a transitional period that delights locals and visitors alike. For more insights on the changing patterns of weather in Mobile, explore the full details at Mobile Climate.