September Weather in Alexandria, United States

Last updated: February 24, 2025

In September, Alexandria experiences a dynamic climate characterized by a maximum temperature reaching up to 37°C (99°F), an average of 22°C (73°F), and a refreshing minimum of 6°C (44°F) at night. This month is marked by a notable precipitation amount of 93 mm (3.7 in), spread across 11 days, contributing to the city's lush surroundings. With a humidity level averaging around 75%, warm days are often accompanied by a sticky, tropical feel, making for a vibrant yet challenging weather experience. Prepare for both sun-soaked afternoons and the possibility of refreshing rain as you navigate this transitional period of late summer.

September Temperature in Alexandria

In September, Alexandria experiences a delightful transition into fall, with temperatures showcasing a pleasant balance. The month begins with a minimum temperature of 6°C (44°F), rising to an average of 22°C (73°F) and peaking at a robust 37°C (99°F). This range reflects a lingering warmth from summer while hinting at cooler days ahead. The shift is notable as the average temperature drops from the soaring heights of August (25°C/78°F), signaling the gradual retreat of the heat. As September unfolds, residents and visitors can enjoy the lingering warmth, making it an ideal time for outdoor activities before the cooler months roll in.

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

The chart illustrates September temperature patterns in Alexandria, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec374247576776817872634841
Data source: Temperature data for Alexandria 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 Alexandria

In September, Alexandria experiences a notable transition in its precipitation patterns, with 93 mm (3.7 in) of rain spread over 11 days. This marks a slight decline from the wetter summer months, particularly August, which recorded 146 mm (5.7 in) over 15 days. The increase in rainfall days in the summer months illustrates a shift towards the wetter season, yet as autumn approaches, September showcases a more moderate rainfall profile, preparing the ground for the transition into October's slightly wetter conditions. Overall, September serves as a pivotal month, balancing lingering summer showers with the onset of fall, leading to a refreshing change in the region's climate.

September Precipitation Trends in Alexandria

The chart displays monthly precipitation patterns in Alexandria, 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.
JanFebMarAprMayJunJulAugSepOctNovDec619682102121108132146931057789
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Alexandria

September in Alexandria marks a subtle shift in humidity levels, settling at 75%, which is a slight increase from the drier peak of 72% experienced in August. This upward trend hints at the approaching fall season, where humidity begins to rise again as temperatures gradually cool. Notably, after the summer months of lower humidity—where July and August saw their driest levels—September’s figures suggest a transitional phase. The pattern of humidity throughout the year reveals an interesting cyclical nature, with the peak levels occurring in the cooler months of November and December at a hefty 85% and 84% respectively. This fluctuation reflects how Alexandria's climate is heavily influenced by seasonal changes, offering residents and visitors a refreshing glimpse into the local weather dynamics as the year progresses.

September Average Humidity in Alexandria

This chart illustrates the average monthly humidity levels in Alexandria, 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.
JanFebMarAprMayJunJulAugSepOctNovDec84%83%83%81%78%79%74%72%75%81%85%84%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Alexandria

As September unfolds in Alexandria, the UV Index remains a robust 8, classifying it within the very high exposure category and necessitating a cautious 15-minute burn time. This month continues the trend of heightened UV levels seen throughout the summer, with values peaking at 10 in June, July, and August. As the seasons transition, September marks a slight decline from the summer peak but still requires vigilance, especially as outdoor activities persist. With this in mind, it's essential for residents and visitors alike to stay informed and protect their skin during sunny excursions. For a detailed understanding of UV levels throughout the year, visit Alexandria UV Index.

Maximum UV Index Levels in Alexandria for September

The chart shows the monthly maximum UV Index (UVI) for Alexandria 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.
JanFebMarAprMayJunJulAugSepOctNovDec357910101098753
Data source: Alexandria 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 Alexandria

As summer yields to fall, September in Alexandria shines with an impressive 276 hours of sunlight, marking a gentle decline from the peak of July's 357 hours. This month continues the trend of abundant light enjoyed throughout the warmer months, particularly in June and July, while still outshining the earlier parts of the year. The vibrant days of September wrap up the summer season with moderate warmth, encouraging outdoor activities and scenic explorations. As the days gradually shorten into October, it's a perfect time to soak in the last rays of summer's embrace before the year transitions into cooler, shorter days.

Monthly Sunshine Duration in Alexandria: September Highlighted

The September sunshine duration represents the total number of hours Alexandria 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.
JanFebMarAprMayJunJulAugSepOctNovDec153h180h259h259h286h331h357h321h276h249h226h190h
Data source: Alexandria September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Alexandria During September

September in Alexandria, United States, stands out with a notable 55% chance of sunny weather, marking it as one of the more promising months for sunshine. This increase in sunny days compared to the preceding months, such as August with only 35%, indicates a shift towards more favorable weather. As summer transitions to fall, September maintains a vibrant atmosphere, offering residents and visitors alike a delightful blend of warm days and clearer skies. This trend suggests that as the year progresses, particularly into autumn, the likelihood of enjoying sunny weather becomes increasingly favorable, making September a prime time for outdoor activities and exploration.

Percentage of Sunny Days in September in Alexandria

The chart illustrates the percentage of sunny days in Alexandria 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 Alexandria experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec46%29%52%49%40%39%49%35%55%41%58%39%
Data source: Alexandria September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Alexandria in September

As September unfolds in Alexandria, daylight begins its gradual descent, offering about 12 hours of sunlight. This month marks a gentle transition from the long, sunlit days of summer—peaking at 14 hours in June, July, and early August—towards the shorter days of autumn. After basking in the extended daylight of summer, residents can now enjoy slightly less light, as nature slowly shifts toward the cozy, golden hues of fall. This rhythm of changing daylight not only signifies a shift in seasons but also invites opportunities for picturesque evenings and the vibrant colors of autumn foliage, creating a delightful atmosphere for all.

Average Daylight Hours in Alexandria for September

The chart illustrates the variation in daylight duration in Alexandria throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec9h 47m10h 45m11h 58m13h 14m14h 18m14h 49m14h 32m13h 35m12h 23m11h 8m10h 2m9h 29m
Data source: Alexandria daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Alexandria

As the summer heat begins to wane, September in Alexandria ushers in a gentle breeze with an average wind speed of 2.5 m/s (6 mph). This shift marks a subtle but notable improvement from the languid gusts of August, where winds dropped to a mere 1.9 m/s (4 mph). The transition reflects a seasonal trend where wind speeds gradually recover from their summer lows, aligning more closely with the figures seen earlier in the year. Overall, September's winds provide a refreshing backdrop, hinting at the cooler days of fall to come while encouraging residents to enjoy the outdoors in this picturesque setting.

Average September Wind Speed in Alexandria

The chart displays monthly wind speed patterns in Alexandria, 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.
JanFebMarAprMayJunJulAugSepOctNovDec2.93.23.23.22.82.52.31.92.5 m/s2.72.92.8
Data source: Alexandria September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Alexandria Compares to Other Months

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

In September, the weather in Alexandria is generally warm, with temperatures ranging from a mild 6°C (44°F) at night to a scorching 37°C (99°F) during the day, averaging around 22°C (73°F). The month experiences a moderate amount of rainfall, totaling 93 mm (3.7 in) over about 11 days, coupled with a relative humidity of 75%. Conversely, January brings a stark contrast, featuring much colder temperatures that can plummet to a minimum of -14°C (7°F) and an average of only 3°C (38°F). Though January's maximum temperature reaches 22°C (71°F), it occurs only rarely and is accompanied by significantly lower precipitation of 61 mm (2.4 in) across just 7 days and a higher humidity level of 84%. For more detailed information, you can view Alexandria weather in January.

September and February present stark contrasts in weather. September typically boasts milder temperatures, with an average of 22°C (73°F) and a maximum reaching up to 37°C (99°F). This month also experiences significant humidity at 75%, alongside 93 mm (3.7 in) of precipitation over 11 days. In contrast, February is much colder, with an average temperature of just 5°C (42°F) and minimums plummeting to -14°C (7°F). While February has slightly more precipitation at 96 mm (3.8 in), the humidity is also higher at 83%. For more detailed insights about weather conditions during this month, you can check out Alexandria weather in February.

Comparing the weather in September and March reveals significant differences in temperature and overall climate conditions. September boasts a warmer temperature range with minimums of 6°C (44°F) and maximums reaching up to 37°C (99°F), averaging around 22°C (73°F). In contrast, March experiences much cooler temperatures, starting as low as -6°C (22°F) and peaking at 29°C (84°F), with an average of only 8°C (47°F). Additionally, while both months see a fair amount of precipitation, September receives slightly more at 93 mm (3.7 in) over 11 days compared to March's 82 mm (3.2 in) across 9 days. Humidity levels are also higher in March at 83% compared to 75% in September. For more detailed information, you can check Alexandria weather in March.

When comparing the weather in September and April, there are notable differences in temperature and humidity levels. September generally has warmer temperatures with a minimum of 6°C (44°F), averaging 22°C (73°F), and reaching a maximum of 37°C (99°F). In contrast, April experiences cooler conditions, with a minimum of -1°C (31°F), an average of 14°C (58°F), and a maximum of 33°C (92°F). Both months see a similar number of precipitation days—11—but April has slightly higher rainfall at 102 mm (4.0 in) compared to September's 93 mm (3.7 in). Additionally, April has a higher humidity level of 81% compared to September's 75%. For more detailed April weather insights, visit Alexandria weather in April.

When comparing the weather in September and May, we see distinct differences despite their similarities. September boasts a higher average temperature of 22°C (73°F) with maximums reaching up to 37°C (99°F), while May has a slightly cooler average of 19°C (67°F) and max temperatures of 35°C (95°F). Precipitation levels are relatively close, with September receiving about 93 mm (3.7 in) over 11 days compared to May's 121 mm (4.8 in) across 12 days. Both months experience high humidity, with September at 75% and May slightly higher at 78%. For a more detailed look at May weather, check out Alexandria weather in May.

In comparing the weather between September and June, September typically experiences a slightly broader temperature range, with minimums dropping to 6°C (44°F), while June has a higher minimum of 9°C (49°F). Both months can peak at a high of 37°C (99°F) in September and 38°C (98°F) in June, but June features an average temperature of 24°C (76°F), compared to September's average of 22°C (73°F). Precipitation is relatively high in both months, with June recording 107 mm (4.2 inches) over 13 days, slightly more than September's 93 mm (3.7 inches) over 11 days. Furthermore, humidity levels in September average around 75%, while June's humidity is higher at 79%. For a closer look at June weather specifics, check out Alexandria weather in June.

September and July weather show distinct differences in both temperature and precipitation patterns. In September, temperatures range from a minimum of 6°C (44°F) to a maximum of 37°C (99°F), with an average of 22°C (73°F). This month experiences about 93 mm (3.7 in) of precipitation over approximately 11 days, coupled with a humidity level of 75%. In contrast, July presents a warmer climate, with temperatures ranging from a minimum of 16°C (61°F) to a high of 38°C (102°F), averaging 27°C (81°F). It also records higher precipitation, with 132 mm (5.2 in) falling over about 12 days and a slightly lower humidity of 74%. For a detailed look at July weather specifics, you can check Alexandria weather in July. Overall, July feels considerably warmer and wetter compared to the milder and less rainy September.

In comparing the weather between September and August, September tends to be cooler with a minimum temperature of 6°C (44°F) and an average of 22°C (73°F), while August is noticeably warmer with a minimum of 15°C (59°F) and an average temperature of 25°C (78°F). Both months share a maximum temperature of 37°C (99°F), but August sees significantly more rainfall with 146 mm (5.7 in) over 15 days compared to September's 93 mm (3.7 in) across 11 days. Humidity levels remain relatively close, with September recording 75% and August at 72%. For more detailed insights, you can check out the Alexandria weather in August.

In September, the weather is typically warmer with an average temperature of 22°C (73°F) and maximum highs reaching up to 37°C (99°F). The month experiences considerable humidity at 75% and sees about 93 mm (3.7 in) of precipitation over 11 days. In contrast, October brings cooler temperatures, with averages dropping to 17°C (63°F) and minimums around 2°C (36°F). The month has slightly higher precipitation at 105 mm (4.2 in), spread over 9 days, and humidity rises to 81%. To explore more details about October weather, check Alexandria weather in October.

September and November present contrasting weather patterns. In September, temperatures range from a minimum of 6°C (44°F) to a blazing maximum of 37°C (99°F), with an average of 22°C (73°F). This month experiences significant humidity at 75% and notable rainfall of 93 mm (3.7 in) over 11 days. In sharp contrast, November features a much cooler climate, with temperatures dipping to a minimum of -5°C (23°F) and averaging at 9°C (48°F). The maximum temperature of 26°C (78°F) indicates a milder day compared to September's heat, while precipitation decreases slightly to 77 mm (3.0 in) over just 7 days, accompanied by higher humidity at 85%. If you'd like to learn more about November weather specifics, check out Alexandria weather in November.

In September, the weather is generally warm, with average temperatures around 22°C (73°F) and highs reaching up to 37°C (99°F). The month experiences a fair amount of rainfall, totaling 93 mm (3.7 in) over about 11 days, coupled with a humidity level of 75%. In contrast, December brings much colder temperatures, with a much lower average of 5°C (42°F) and minimums dropping to -10°C (14°F). Precipitation remains relatively consistent at 89 mm (3.5 in) over just 9 days, but the humidity increases to 84%. This dramatic shift from the warmth of September to the chill of December highlights the seasonal transition, affecting everything from outdoor activities to local flora. For more details on December weather, check out Alexandria weather in December.

Compare Alexandria's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Alexandria

As September ushers in the start of autumn, Alexandria's weather begins to shift significantly compared to the sweltering summer months. With temperatures cooling down from the summer highs, residents can expect a much more comfortable atmosphere. However, September also brings a touch of unpredictability, with intermittent rainfall contributing to a higher humidity level. This blend of warmth and moisture creates a unique climate experience, allowing for both sunny days and occasional drizzles. For a deeper understanding of how September fits into Alexandria's overall climate pattern, check out Alexandria Climate.