September Weather in Atlantic City, United States

Last updated: February 24, 2025

Experience Atlantic City in September, where the weather offers a pleasant blend of warmth and refreshing breezes. With daytime temperatures averaging 22°C (72°F) and reaching a maximum of 29°C (85°F), it's an ideal time for outdoor activities. The minimum temperature dips to a cool 13°C (56°F) at night. Expect some rain, with 122 mm (4.8 in) of precipitation spread over 9 days, adding a touch of moisture to the atmosphere, which boasts a humidity level of 74%. Whether you're soaking up the sun or enjoying post-rain strolls along the boardwalk, September in Atlantic City promises a delightful experience.

September Temperature in Atlantic City

As summer winds down in Atlantic City, September brings a delightful transition in temperatures, making it a prime time to soak in the coastal beauty. With minimums around 13°C (56°F) and maximums reaching up to 29°C (85°F), the average temperature hovers at a comfortable 22°C (72°F). This month showcases a gradual shift from the warm, sultry days of August, which peak at 30°C (86°F), to the cooler embraces of autumn that are just around the corner. The warm air still clings to the shoreline, inviting beachgoers to enjoy the lingering sun before the cooler October days set in, offering a perfect blend of warmth and mildness that makes September truly enjoyable.

September Weather in Atlantic City: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Atlantic City, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec384043515969767672645143
Data source: Temperature data for Atlantic City 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 Atlantic City

In September, Atlantic City experiences a notable uptick in precipitation, registering an average of 122 mm (4.8 inches) over the month. This surge marks a contrast to the preceding summer months, with July and August averaging 109 mm and 97 mm respectively. Interestingly, September has a relatively low number of precipitation days, totaling just 9, suggesting that the rain tends to fall in heavier bursts rather than being spread out. As the region transitions into autumn, this pattern of increased rainfall prepares the landscape for the wetter months ahead, notably October, which typically sees even more significant precipitation at 152 mm (6.0 inches). Overall, September stands out as a pivotal month that signals the shift from summer's lighter rains to the more substantial downpours characteristic of fall.

September Precipitation Trends in Atlantic City

The chart displays monthly precipitation patterns in Atlantic City, 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.
JanFebMarAprMayJunJulAugSepOctNovDec7911711198115691109712215294121
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Atlantic City

As summer gives way to fall in Atlantic City, September ushers in a notable shift in humidity levels, dropping to 74%. This decline marks a continuation of the trend observed throughout the season, with humidity gradually decreasing from the summer highs of 77% in both August and June. Notably, this month mirrors the 74% humidity seen in May, suggesting a transition into crisper autumn air. Furthermore, this decline is a part of a broader yearly pattern where the highest humidity peaks in the colder months of January and February at 83% and 82% respectively, showing a gradual reduction as the year advances. The refreshing drop in September not only enhances the coastal experience but also signals the approach of the more temperate autumn months ahead.

September Average Humidity in Atlantic City

This chart illustrates the average monthly humidity levels in Atlantic City, 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.
JanFebMarAprMayJunJulAugSepOctNovDec83%82%81%79%74%77%76%77%74%75%80%81%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Atlantic City

As summer fades into September, Atlantic City continues to experience a very high UV Index of 8, requiring just 15 minutes of exposure before risking sunburn. This slight decline from the peak summer months of July and August, where the UV Index consistently reaches 10, highlights a gradual transition in sun safety awareness. With the UV Index decreasing from the summer months but still remaining elevated, it's important for beachgoers and outdoor enthusiasts to stay vigilant about sun protection. As October approaches, the UV Index will further drop to 7, marking the beginning of a trend towards milder conditions. For more detailed information, check out the Atlantic City UV Index.

Maximum UV Index Levels in Atlantic City for September

The chart shows the monthly maximum UV Index (UVI) for Atlantic City 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.
JanFebMarAprMayJunJulAugSepOctNovDec3569101010108743
Data source: Atlantic City 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 Atlantic City

September in Atlantic City radiates a golden glow, offering 294 hours of sunshine, a beautiful transition from the peak summer months. As summer fades, the sunshine gradually decreases from the 364 hours in July, yet still lingers delightfully, inviting visitors to bask in the warmth of early autumn. This month marks a significant drop from August's 335 hours, but as the season shifts, the vibrant hues of fall begin to paint the landscape. Interestingly, September's sunlight hours are noticeably higher than the winter months, such as January's meager 158 hours, suggesting that the city's charm persists even as the heat of summer wanes. Embrace the lingering sunshine of September in Atlantic City—a perfect time to enjoy the beach, boardwalk, and all the late-summer festivities before the cooler days of October settle in.

Monthly Sunshine Duration in Atlantic City: September Highlighted

The September sunshine duration represents the total number of hours Atlantic City 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.
JanFebMarAprMayJunJulAugSepOctNovDec158h183h264h274h315h342h364h335h294h252h228h187h
Data source: Atlantic City September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Atlantic City During September

In Atlantic City, September stands out with a sunshine probability of 55%, matching the peak levels seen in July. As summer transitions to autumn, the likelihood of sunny weather remains robust, offering delightful days for visitors. Interestingly, this month shares a similar chance of sun with March, highlighting a trend where late summer and early fall months present promising weather patterns. Following the high probabilities of summer, September allows for a seamless blend of warmth and sunshine, making it an ideal time for beachgoers and outdoor enthusiasts to enjoy the shoreline before the cooler temperatures settle in.

Percentage of Sunny Days in September in Atlantic City

The chart illustrates the percentage of sunny days in Atlantic City 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 Atlantic City experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec52%28%54%48%47%42%55%36%55%46%56%36%
Data source: Atlantic City September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Atlantic City in September

As summer transitions into fall, September in Atlantic City experiences a gentle decline in daylight duration, offering about 12 hours of sunshine each day. This marks a gradual shift from the lengthy 14 hours seen in the peak summer months of June, July, and August. The daylight starts to shorten, signaling the approach of autumn, as daylight dwindles from hour to hour. Following this slight retreat, October will witness even less sunlight, dipping to 11 hours, which emphasizes the seasonal rhythm of daylight throughout the year. It's a time when beachgoers may savor the last warm evenings, while residents begin to embrace the cozy ambiance of the fall months ahead.

Average Daylight Hours in Atlantic City for September

The chart illustrates the variation in daylight duration in Atlantic City throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec9h 44m10h 43m11h 58m13h 15m14h 20m14h 52m14h 35m13h 37m12h 23m11h 6m9h 59m9h 25m
Data source: Atlantic City daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Atlantic City

As summer wanes and September arrives in Atlantic City, the winds begin to stir back to life. With an average wind speed of 5.0 m/s (11 mph), this month marks a shift from the gentle breezes of the warmer season, which dipped as low as 3.8 m/s (8 mph) in August. The prevailing winds show a gradual reawakening, hinting at the approach of autumn. This revitalization continues into October, where speeds increase to 5.5 m/s (12 mph), setting the stage for a breezier fall. Notably, the lightest winds of the year are experienced during the mid-summer months, indicating a clear seasonal pattern that draws back towards higher velocities as the sunny days start to fade.

Average September Wind Speed in Atlantic City

The chart displays monthly wind speed patterns in Atlantic City, 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.
JanFebMarAprMayJunJulAugSepOctNovDec5.46.25.65.24.94.74.33.85.0 m/s5.55.85.0
Data source: Atlantic City September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Atlantic City Compares to Other Months

The weather in Atlantic City 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 Atlantic City and find detailed weather information for every month.

September and January present stark contrasts in weather conditions. In September, temperatures range from a pleasant 13°C (56°F) at night to a warm average of 22°C (72°F), peaking at a high of 29°C (85°F). With 122 mm (4.8 in) of precipitation spread over 9 days and a humidity level of 74%, the month can feel quite tropical. In contrast, January experiences a drastic drop in temperatures, with minimums plunging to -14°C (8°F) and averaging just 3°C (38°F). Even the maximum temperature of 16°C (61°F) feels chilly compared to September. January has lower precipitation at 79 mm (3.1 in), also over 9 days, but the humidity is slightly higher at 83%, creating a crisp but damp atmosphere. For more specific details, check Atlantic City weather in January.

September and February present starkly contrasting weather conditions. In September, the temperatures are much milder, with a minimum of 13°C (56°F) and an average of 22°C (72°F), peaking at a warm 29°C (85°F). The month experiences a total precipitation of 122 mm (4.8 in) over about 9 days, accompanied by a humidity level of 74%. In contrast, February chills the atmosphere significantly, with temperatures ranging from a brisk minimum of -12°C (11°F) to a maximum of only 13°C (57°F), resulting in an average of just 4°C (40°F). While the precipitation is slightly lower at 117 mm (4.6 in) over 12 days, the humidity remains high at 82%. For a deeper look at what to expect during the winter months, check out Atlantic City weather in February.

In comparing the weather of September and March, significant differences are evident. September enjoys a mild range of temperatures, with a minimum of 13°C (56°F) and an average of 22°C (72°F), reaching a maximum of 29°C (85°F). This month typically experiences 122 mm (4.8 in) of rainfall over 9 days, accompanied by a humidity level of 74%. In contrast, March has a much cooler climate, with temperatures ranging from a minimum of -6°C (22°F) to an average of 6°C (43°F) and a maximum of 18°C (66°F). It sees slightly less precipitation at 111 mm (4.4 in) over 10 days, along with a higher humidity level of 81%. For more insights, you can visit Atlantic City weather in March.

In comparing the weather between September and April, we can see distinct differences in temperature and precipitation. September boasts milder temperatures, with average highs around 22°C (72°F) and maximums reaching up to 29°C (85°F), while April is noticeably cooler, with an average high of only 11°C (51°F) and maximums at 21°C (70°F). In terms of precipitation, September experiences slightly more rainfall at 122 mm (4.8 in) over 9 days compared to April's 98 mm (3.9 in) over 11 days. Interestingly, humidity levels are also higher in April at 79%, compared to September's 74%. For more detailed information on specific conditions, you can check out Atlantic City weather in April.

When comparing the weather in September to that of May, several notable differences emerge. September tends to be warmer, with average temperatures reaching 22°C (72°F) compared to May's cooler average of 15°C (60°F). The maximum temperature in September hits 29°C (85°F), while May's maximum is a milder 25°C (78°F). Precipitation levels are fairly similar, with September receiving 122 mm (4.8 in) over 9 days and May slightly less at 115 mm (4.5 in) over 11 days. Both months share a consistent humidity level of 74%, creating a similar feel in terms of moisture in the air. For more detailed information, check out Atlantic City weather in May.

When comparing the weather in September and June, it's evident that both months experience mild temperatures, but September tends to be slightly warmer. September boasts an average temperature of 22°C (72°F) with maximums reaching up to 29°C (85°F), while June averages around 21°C (70°F) and peaks at 28°C (83°F). Humidity levels are similar, with September at 74% and June slightly higher at 77%. However, September receives considerably more precipitation, totaling 122 mm (4.8 in) over 9 days compared to June's 69 mm (2.7 in) in the same number of days. For a closer look at June weather in Atlantic City, visit Atlantic City weather in June.

In comparing the weather conditions of September and July, September tends to be slightly cooler, with an average temperature of 22°C (72°F), while July enjoys warmer temperatures averaging around 25°C (77°F). The minimum temperature in September dips to 13°C (56°F), noticeably lower than July's minimum of 19°C (66°F). Precipitation levels are relatively similar, with September receiving 122 mm (4.8 in) over 9 days compared to July's 109 mm (4.3 in) spread over 10 days. Humidity remains fairly consistent between the two months, with September at 74% and July at 76%. For more details on July weather, check out Atlantic City weather in July.

In comparing the weather of September and August, September tends to be slightly cooler, with average temperatures ranging from a minimum of 13°C (56°F) to a maximum of 29°C (85°F), while August has warmer averages, featuring minimum temperatures of 18°C (64°F) and a maximum of 30°C (86°F). August also experiences slightly lower precipitation, totaling 97 mm (3.8 in) over 12 days, compared to September's 122 mm (4.8 in) over 9 days. Humidity levels remain similar, with September at 74% and August at 77%. For those interested in a more detailed overview, check out the Atlantic City weather in August.

In September, the weather is generally warmer with average temperatures around 22°C (72°F), peaking at 29°C (85°F), whereas October sees a drop in average temperatures to 18°C (64°F) with a minimum of 6°C (44°F). While both months experience considerable precipitation, October has slightly more, with 152 mm (6.0 in) over 10 days, compared to September's 122 mm (4.8 in) over 9 days. Humidity levels remain similar, with September at 74% and October at 75%, resulting in a slightly cooler, yet still quite damp October. For an in-depth look at the weather in October, you can visit Atlantic City weather in October.

September and November showcase a stark contrast in weather conditions. In September, temperatures range from a mild 13°C (56°F) to a warm 29°C (85°F), with an average of 22°C (72°F), and the month receives 122 mm of precipitation over about 9 days, accompanied by a humidity level of 74%. By November, the climate shifts significantly, featuring a minimum temperature of -3°C (26°F) and an average of 11°C (51°F), peaking at 21°C (70°F). Precipitation drops to 94 mm, also measured over 9 days, with humidity slightly increasing to 80%. For more detailed insights, you can check Atlantic City weather in November.

September and December present stark contrasts in weather characteristics. In September, temperatures range from a mild 13°C (56°F) at night to a warm 29°C (85°F) during the day, with an average of 22°C (72°F). The month sees about 122 mm (4.8 in) of precipitation spread over 9 days and a humidity level of 74%. In contrast, December experiences much colder conditions, with temperatures dipping as low as -8°C (18°F) and only reaching a maximum of 17°C (64°F), averaging around 6°C (44°F). Precipitation remains similarly high at 121 mm (4.8 in), but it occurs over 11 days, accompanied by increased humidity at 81%. For more detailed information on December's weather, you can visit Atlantic City weather in December.

Compare Atlantic City's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Atlantic City

As September rolls into Atlantic City, the weather begins to shift, offering a delightful transition from summer's heat. With average temperatures hovering around 22°C (72°F), the days are pleasantly warm, making it an ideal time for outdoor activities. However, those looking to bask under the sun should be prepared for sporadic rain, as precipitation can reach around 122 mm over 9 days, creating a refreshing contrast to the drier summer months. Humidity also remains elevated at 74%, making the air feel a bit thicker than in previous months. This combination of warmth and moisture not only enhances the lushness of the coastal landscape but also allows visitors to enjoy Atlantic City's vibrant atmosphere in a more temperate climate. For a more comprehensive look at weather patterns year-round, be sure to check the Atlantic City Climate.