September Weather in Georgetown, United States

Last updated: February 24, 2025

In Georgetown, United States, September ushers in a blend of warmth and moisture, with maximum temperatures peaking at 33°C (92°F) and a comfortable average of 25°C (77°F). Nights can be cooler, dipping to a minimum of 13°C (55°F). However, this month also brings considerable rainfall, amassing 185 mm (7.3 in) over 13 days, resulting in a humidity level that hovers around a steamy 81%. Whether you’re enjoying the warm days or bracing for the occasional downpour, September in Georgetown is a month of transition and vibrant weather patterns.

September Temperature in Georgetown

In September, Georgetown experiences a pleasant transition from the scorching summer months, with temperatures ranging from a minimum of 13°C (55°F) to a maximum of 33°C (92°F). The average temperature hovers around 25°C (77°F), signaling a comfortable warmth that invites outdoor activities. These temperatures reflect a gradual cooling trend, as they begin to dip from the intense heat of August, which saw maximums reach up to 34°C (93°F). This month serves as a perfect preamble to autumn, where the lingering warmth of summer meets the crispness of fall, creating ideal conditions for exploration and enjoyment of the stunning landscape that Georgetown has to offer.

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

The chart illustrates September temperature patterns in Georgetown, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec505558657378818077705853
Data source: Temperature data for Georgetown 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 Georgetown

In September, Georgetown experiences a notable shift in its weather patterns, with precipitation reaching 185 mm (7.3 in) over 13 days. This marks a slight decrease from the previous month's substantial 229 mm (9.0 in), indicating a transition as summer draws to a close. The consistent rainfall throughout the month signifies a lingering influence of late summer storms, yet fewer precipitation days suggest that the downpours are becoming less frequent. As the season changes, residents can expect this month's substantial yet diminishing rainfall to set the stage for October's typically drier conditions, where only 61 mm (2.4 in) is anticipated. The overall trend illustrates Georgetown's journey from the peak of summer saturation toward the calmer, cooler days of fall.

September Precipitation Trends in Georgetown

The chart displays monthly precipitation patterns in Georgetown, 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.
JanFebMarAprMayJunJulAugSepOctNovDec6992751011121551802291856188147
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

September Humidity in Georgetown

In September, Georgetown experiences a humidity level of 81%, which is consistent with the slightly elevated levels seen throughout the summer months. This trend of higher humidity peaks during the warmest part of the year is evident, as July and August also boast humidity levels of 82% and 81%, respectively. As the season shifts towards fall, humidity gradually declines, but September still retains a considerable amount of moisture in the air. The overall pattern showcases Georgetown's climate transitioning from the sultry summer to more moderate conditions, with an expected drop to 78% in October. This gradual decrease hints at the cooler air that autumn brings, while still holding onto a semblance of summer’s humidity.

September Average Humidity in Georgetown

This chart illustrates the average monthly humidity levels in Georgetown, 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%80%79%78%78%78%82%81%81%78%82%84%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Georgetown

In September, Georgetown experiences a very high UV Index of 9, marking a slight decline from the extreme levels seen during the peak summer months. With a burn time of just 15 minutes, it's evident that while the sweltering heat eases, the sun's intensity remains a concern for outdoor enthusiasts. This month’s UV Index reflects a trend where summer months consistently reach extreme levels (11), while transitioning into autumn brings a gradual reduction in exposure risk. However, participants in outdoor activities should still exercise caution and take protective measures. For detailed insights on UV exposure throughout the year, visit Georgetown UV Index.

Maximum UV Index Levels in Georgetown for September

The chart shows the monthly maximum UV Index (UVI) for Georgetown 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.
JanFebMarAprMayJunJulAugSepOctNovDec47810111111119864
Data source: Georgetown 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 Georgetown

As summer transitions into fall, September in Georgetown offers a delightful 301 hours of sunshine, slightly less than the sun-drenched peak of July but still a generous amount to enjoy outdoor activities. The sunlight begins to soften, creating a more temperate atmosphere compared to the sweltering months of July and August, which boast 343 and 320 hours respectively. This gradual decrease in sunshine sets the stage for the seasonal shifts ahead, with October following closely behind at 292 hours. While September marks the winding down of the brighter summer days, it still provides ample sunlight to savor the beauty of changing leaves and the crisp fall air.

Monthly Sunshine Duration in Georgetown: September Highlighted

The September sunshine duration represents the total number of hours Georgetown 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.
JanFebMarAprMayJunJulAugSepOctNovDec186h210h273h309h337h319h343h320h301h292h247h216h
Data source: Georgetown September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Georgetown During September

As September rolls around in Georgetown, the likelihood of sunny weather climbs to 51%, marking a pleasant shift after the summer months. While June and July grapple with lower sunshine probabilities of 32% and 38%, respectively, September stands out as a more favorable time for outdoor activities and enjoying the area's natural beauty. This trend of increasing sunshine continues into October, which sits at 48%, but the peak for clear skies is yet to come, with November boasting a significant 62% chance. Therefore, if you're looking to soak up some sun, September offers a charming balance between late summer warmth and the forthcoming autumn glow, making it an ideal time to embrace Georgetown’s scenic vistas.

Percentage of Sunny Days in September in Georgetown

The chart illustrates the percentage of sunny days in Georgetown 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 Georgetown experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec47%37%36%59%50%32%38%34%51%48%62%46%
Data source: Georgetown September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Georgetown in September

As September arrives in Georgetown, the daylight begins to wane, offering a gentle transition from the vibrant summer days. With an average of 12 hours of daylight, this month marks a gradual decline following the peak of 14 hours in June and July. The trend reveals a slow but steady shortening of days, with sunlight tapering off from the long, sun-soaked days of summer to the crisper, shorter rays of autumn. As the month progresses, residents can enjoy the beauty of early fall, while anticipating the cozy, shorter days of October ahead. This rhythm of daylight serves as a reminder of nature's changing seasons, inviting moments of reflection and appreciation for the fleeting warmth of summer.

Average Daylight Hours in Georgetown for September

The chart illustrates the variation in daylight duration in Georgetown throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec10h 12m10h 59m11h 59m13h 1m13h 53m14h 18m14h 4m13h 19m12h 19m11h 18m10h 24m9h 58m
Data source: Georgetown daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Georgetown

As September arrives in Georgetown, the winds begin to shift, mirroring the transition from summer to fall. With an average wind speed of 2.9 m/s (6 mph), September experiences a slight uptick from the summer lows seen in August, where the gentle breezes reached only 2.6 m/s (6 mph). This small increase marks a welcome change, hinting at the promise of cooler days ahead. The trend of gradually decreasing wind speeds from the spring's peak of 4.1 m/s (9 mph) in March is still evident, yet September holds onto a sense of stillness before the brisk winds of autumn take over. As the year progresses, Georgetown’s winds prepare for a revival, providing a serene backdrop for the vibrant fall foliage that soon follows.

Average September Wind Speed in Georgetown

The chart displays monthly wind speed patterns in Georgetown, 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.
JanFebMarAprMayJunJulAugSepOctNovDec3.83.94.13.83.83.63.12.62.9 m/s3.43.83.6
Data source: Georgetown September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Georgetown Compares to Other Months

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

In September, temperatures are warm, with a minimum of 13°C (55°F) and a maximum of 33°C (92°F), averaging around 25°C (77°F). The month experiences significant rainfall, totaling 185 mm (7.3 in) over 13 days, and humidity remains high at 81%. In contrast, January offers a starkly different climate, with much cooler temperatures ranging from a minimum of -10°C (14°F) to a maximum of 24°C (76°F), averaging 10°C (50°F). Rainfall decreases to 69 mm (2.7 in) over just 8 days, while humidity slightly rises to 83%. For more detailed insights, check out Georgetown weather in January.

September and February display stark differences in weather patterns. September experiences much warmer temperatures, with averages around 25°C (77°F) and highs reaching up to 33°C (92°F), compared to February's cooler average of 13°C (55°F) and a maximum of 26°C (78°F). Additionally, September is characterized by higher humidity at 81% and significantly more precipitation, with about 185 mm (7.3 in) over approximately 13 days. In contrast, February sees less rainfall, totaling 92 mm (3.6 in) across about 10 days, along with slightly lower humidity levels at 79%. For further details on February's climate in this region, you can explore Georgetown weather in February.

September weather is characterized by warmer temperatures, averaging 25°C (77°F) with maximums reaching up to 33°C (92°F), while March temperatures are noticeably cooler, averaging 14°C (58°F) and peaking at 27°C (82°F). Rainfall is much heavier in September, with 185 mm (7.3 in) falling over 13 days, compared to March, which sees only 75 mm (2.9 in) across 9 days. Additionally, September's humidity is slightly higher at 81%, compared to 79% in March. For more details on March weather, you can check Georgetown weather in March.

When comparing the weather in September and April, notable differences emerge in temperature and precipitation. September boasts a much warmer average temperature of 25°C (77°F) and can reach highs of 33°C (92°F), while April is cooler, with an average of 18°C (65°F) and a maximum of 29°C (84°F). Additionally, September experiences significantly more rainfall, with 185 mm (7.3 inches) over approximately 13 days compared to April's 101 mm (4.0 inches) across 8 days. Humidity levels are relatively similar, with September slightly higher at 81% and April at 78%. For those interested in more specific details, you can check Georgetown weather in April.

In a comparison of September and May weather, September tends to be warmer overall but more humid, with average temperatures ranging from a minimum of 13°C (55°F) to a maximum of 33°C (92°F). It experiences higher precipitation, with 185 mm (7.3 in) over about 13 days, contributing to a humidity level of 81%. In contrast, May showcases a slightly cooler average temperature, with minimums of 8°C (48°F) and maximums reaching up to 35°C (95°F). This month is also drier, receiving only 112 mm (4.4 in) of rain across 9 days, and slightly lower humidity at 78%. For more detailed information, you can check out Georgetown weather in May.

In comparing the weather of September and June, we see some interesting similarities and differences. Both months feature an average temperature of around 25°C (77°F), but September tends to offer slightly cooler minimum temperatures at 13°C (55°F) compared to June's 14°C (57°F). Additionally, June boasts a higher maximum temperature of 34°C (94°F) versus September's 33°C (92°F). In terms of precipitation, September is wetter, with 185 mm (7.3 in) falling over 13 days, while June sees relatively less rain at 155 mm (6.1 in) across 17 days. The humidity is also marginally higher in September at 81%, compared to June's 78%. For a more detailed look at the weather during June, you can refer to Georgetown weather in June.

In comparison to July, September experiences slightly cooler temperatures, with minimums dropping from 19°C (66°F) to 13°C (55°F) while maintaining similar maximums at 33°C (92°F). The average temperature in September is 25°C (77°F), which is a decrease from July's average of 27°C (81°F). Despite having similar levels of precipitation—185 mm (7.3 in) in September compared to 180 mm (7.1 in) in July—the rainfall is spread over fewer days in September (13 days versus 19 days in July). Humidity levels remain closely matched, with September showing 81% and July 82%, indicating a consistent level of moisture in the air. For a more detailed look at the weather during this month, check out Georgetown weather in July.

In comparing the weather of September and August, September experiences slightly cooler overall temperatures, with a minimum of 13°C (55°F) and a maximum of 33°C (92°F), while August remains warmer with a minimum of 20°C (67°F) and a maximum of 34°C (93°F). Precipitation is also lower in September, totaling 185 mm (7.3 in) over 13 days, compared to August's 229 mm (9.0 in) over 21 days. Interestingly, both months share a high humidity level of 81%, making them feel quite muggy regardless of the slight temperature differences. For more detailed information, you can visit Georgetown weather in August.

September and October showcase a notable transition in weather patterns. In September, temperatures range from a minimum of 13°C (55°F) to an average of 25°C (77°F) and can peak at 33°C (92°F). The month is characterized by higher precipitation, totaling 185 mm (7.3 in) over 13 days, along with relatively high humidity at 81%. In contrast, October brings cooler temperatures, with a minimum of 5°C (41°F) and an average of 21°C (71°F), while still allowing for warm highs of 33°C (91°F). Rainfall significantly decreases to 61 mm (2.4 in) across 8 days, and humidity reduces slightly to 78%. For more details on the weather during this month, check out Georgetown weather in October.

September experiences warmer temperatures, with daily averages reaching up to 25°C (77°F) and maximums soaring to 33°C (92°F), while November sees a significant drop, with averages around 14°C (58°F) and maximums capped at 28°C (83°F). Precipitation also varies noticeably; September records 185 mm (7.3 in) of rain over 13 days, compared to November's more manageable 88 mm (3.5 in) over just 10 days. Despite these changes, humidity remains relatively constant, at 81% in September and slightly lower at 82% in November. For more detailed information, check out Georgetown weather in November.

In September, temperatures are notably warmer, with an average of 25°C (77°F) and highs reaching up to 33°C (92°F), creating a humid environment with 81% humidity. The month experiences considerable rainfall, totaling 185 mm (7.3 in) over 13 days. In contrast, December brings a significant drop in temperatures, with averages around 12°C (53°F) and a maximum of 24°C (75°F). While it feels much cooler, humidity remains relatively high at 84%. Rainfall in December is lower, at 147 mm (5.8 in) across just 10 days. For more detailed information, check out Georgetown weather in December.

Compare Georgetown's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Georgetown

As September unfolds in Georgetown, the weather displays a distinct character that sets it apart from the summer months. With temperatures averaging a comfortable 25°C (77°F), this transitional period invites a balance between the lingering heat and the early whispers of autumn. While the region experiences an increase in precipitation—with around 185 mm falling over approximately 13 days—the heightened humidity at 81% can make the air feel heavy and thick. This unique combination of warmth and wetness heralds a shift, making September a notable bridge between the warm, sultry summer and the cooler fall. For more insights into the climate patterns, visit Georgetown Climate.