September Weather in Waco, United States

Last updated: February 24, 2025

September in Waco, United States, presents a striking blend of warmth and occasional rain. With maximum temperatures soaring up to 39°C (103°F) and an average of 27°C (81°F), the month invites residents and visitors to bask in the sun. However, nights offer a refreshing contrast with minimum temperatures dropping to 11°C (51°F). The atmosphere is often hum humid, featuring a 69% humidity level, which can make the heat feel more intense. Rainfall is also a factor, as 80 mm (3.1 in) of precipitation graces the area over 7 days, providing brief respites from the summer's heat. Overall, September in Waco encapsulates a vibrant end to the warm season, where sunshine meets the soothing touch of rain.

September Temperature in Waco

In September, Waco, Texas, begins to transition from the sweltering summer heat to more moderate temperatures. The month starts with minimums around 11°C (51°F), rising to an average of 27°C (81°F), and peaking at a maximum of 39°C (103°F). This notable average temperature hints at a lingering warmth, typical of early autumn, but the drastic reduction from the extreme highs of August indicates the region's gradual cooling trend. As the days shorten and the air crispens, September serves as a prelude to the cooler, more temperate months ahead, allowing residents and visitors to enjoy outdoor activities in pleasant conditions.

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

The chart illustrates September temperature patterns in Waco, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec505263677682868681705954
Data source: Temperature data for Waco 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 Waco

In September, Waco experiences a noteworthy balance in its precipitation patterns, receiving 80 mm (3.1 in) of rain over 7 days. This amount is slightly above the summer months, indicating a transition towards the wetter fall season. Following the summer's drier spells, September's rainfall marks a return to more consistent moisture, which sets the stage for October's significant increase. The rhythm of precipitation is evident, with September maintaining a similar volume to August, showcasing the region's climatic variability throughout the year. As the weather cools, residents can expect this uptick in rainfall to continue, paving the way for the lush autumn landscapes that characterize Waco.

September Precipitation Trends in Waco

The chart displays monthly precipitation patterns in Waco, 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.
JanFebMarAprMayJunJulAugSepOctNovDec60788196184775178801295163
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Waco

In September, Waco experiences a noticeable drop in humidity, with levels averaging around 69%. This marks a shift from the sultry summer months, which peaked in June at 77% and fell to 67% in August. The transition into fall brings a sense of relief from the oppressive heat, as humidity levels begin to increase again, gradually rising to 73% in October. This trend reflects a yearly cycle in Waco, where humidity levels are generally highest in the winter months, reaching 87% in December, while late summer offers a breath of fresh air with lower figures. Ultimately, September serves as a pivotal point, balancing the lingering warmth of summer with the anticipation of the cooler, more refreshing days ahead.

September Average Humidity in Waco

This chart illustrates the average monthly humidity levels in Waco, 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.
JanFebMarAprMayJunJulAugSepOctNovDec80%80%78%79%81%77%71%67%69%73%82%87%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Waco

As summer transitions into fall, September in Waco, United States, sees a UV Index of 10, categorizing it as very high. This indicates that while the intensity of the sun begins to wane compared to the peak of summer, sun protection remains essential. With a burn time of just 15 minutes, it's crucial to stay vigilant about sun safety, especially for those spending extended periods outdoors. Following a trend of extreme UV levels during the preceding months of June and July, September continues to command respect from sun worshippers and outdoor enthusiasts alike. As we approach October, a drop to an Index of 8 signals that while UV exposure is still significant, the urgency of protection can begin to ease. For more detailed insights, visit the Waco UV Index.

Maximum UV Index Levels in Waco for September

The chart shows the monthly maximum UV Index (UVI) for Waco 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.
JanFebMarAprMayJunJulAugSepOctNovDec478101112121110864
Data source: Waco 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 Waco

September ushers in a delightful transition in Waco, USA, boasting 279 hours of sunshine, just a tad lower than the summer peak but still radiant enough to signal the onset of autumn. The sun-drenched days of July and June hold the record, with breathtaking 356 and 338 hours respectively, while August maintains a robust showing at 330 hours. As summer gracefully fades, September’s sun is reminiscent of the lively warm days, with abundant light for outdoor activities, yet it hints at cooler evenings ahead. This month marks a gentle decline leading into fall, as October follows closely with 273 hours of sunshine. With each passing month, Waco sees a gradual ebb of daylight, creating a perfect blend of warm sunny days and the fresh, crisp air of the changing season.

Monthly Sunshine Duration in Waco: September Highlighted

The September sunshine duration represents the total number of hours Waco 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.
JanFebMarAprMayJunJulAugSepOctNovDec174h169h242h257h280h338h356h330h279h273h238h224h
Data source: Waco September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Waco During September

As the summer heat begins to wane, September in Waco, Texas, presents a promising 61% chance of sunny weather, marking one of the year's most radiant months. This is a notable upswing from the previous months, with only 27% sunshine likelihood in May and an average of 43% during the peak of summer. As the transition to autumn approaches, the mix of lingering warmth and increasing sunshine offers a delightful backdrop for outdoor activities. Interestingly, the likelihood of sunny days remains consistent through October and November, highlighting September as a charming gateway into Waco’s beautiful fall. Whether you're planning a picnic or simply soaking in the sun, September's bright days are perfect for enjoying all that this vibrant city has to offer.

Percentage of Sunny Days in September in Waco

The chart illustrates the percentage of sunny days in Waco 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 Waco experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec53%44%56%41%27%45%43%50%61%61%61%48%
Data source: Waco September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Waco in September

As summer fades, September in Waco, Texas, marks a subtle transition in daylight duration, offering approximately 12 hours of daylight. Following the peak of 14 hours in June, the days begin to shorten, echoing the gradual decline established in August. This decrease reflects a broader trend throughout the year—longer, sun-drenched days in late spring and early summer give way to the cozy embrace of autumn. With daylight gradually ebbing from 13 hours in the preceding months, September maintains a delicate balance before cascading into the shorter days of fall. As nature shifts gears, Wacoans can savor the lingering warmth of summer while anticipating the crispness of autumn days ahead.

Average Daylight Hours in Waco for September

The chart illustrates the variation in daylight duration in Waco throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec10h 20m11h 4m12h12h 57m13h 45m14h 9m13h 56m13h 13m12h 18m11h 21m10h 31m10h 7m
Data source: Waco daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Waco

As September settles in Waco, the average wind speed slows to a gentle 2.9 m/s (7 mph), mirroring the calmer breezes of July and August. This consistent drop in wind speed throughout the summer months hints at a transition towards the more dynamic fall season. While early months like January and March boast brisker winds, September's whispering air offers a respite, allowing residents to savor the subtle shifts in nature as summer edges towards autumn. As temperatures begin to cool, the tranquil winds invite a sense of reflection and anticipation for the vibrant changes ahead.

Average September Wind Speed in Waco

The chart displays monthly wind speed patterns in Waco, 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.
JanFebMarAprMayJunJulAugSepOctNovDec3.84.54.84.43.93.32.93.32.9 m/s3.83.84.1
Data source: Waco September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Waco Compares to Other Months

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

September and January showcase stark contrasts in weather. In September, temperatures can soar, ranging from a cool 11°C (51°F) to a blistering high of 39°C (103°F), with an average of 27°C (81°F). However, this month sees significant humidity at 69% and around 80 mm (3.1 in) of precipitation over 7 days. In comparison, January brings a much colder climate, with temperatures dropping to a minimum of -10°C (14°F) and an average of just 10°C (50°F), peaking at 27°C (81°F). Precipitation is slightly lower in January, totaling 60 mm (2.4 in) over about 6 days, with humidity rising to 79%. For more details on January weather, check out Waco weather in January.

In September, the weather is notably warmer, with temperatures ranging from a mild 11°C (51°F) to a scorching 39°C (103°F), while the average temperature is a comfortable 27°C (81°F). The month experiences about 80 mm (3.1 in) of precipitation over approximately 7 days, accompanied by a humidity level of 69%. In contrast, February presents a starkly different climate, with temperatures dipping as low as -16°C (4°F) and peaking at a maximum of 30°C (87°F). The average temperature is considerably cooler at 11°C (52°F), and the precipitation is similar at 78 mm (3.1 in) but lasts over 9 days, with humidity slightly higher at 80%. For more detailed insights into February weather, you can check Waco weather in February.

In September, the weather tends to be quite warm, with average temperatures around 27°C (81°F) and maximums reaching up to 39°C (103°F). The month sees a fair amount of humidity at 69% and experiences about 80 mm (3.1 in) of rain over approximately 7 days. In contrast, March brings a much cooler climate, with temperatures ranging from a minimum of -5°C (23°F) to an average of 17°C (63°F) and highs that can reach up to 33°C (91°F). While March has a slightly higher precipitation level of 81 mm (3.2 in) spread across about 9 days, humidity also ramps up to 78%. For more detailed insights into the weather during March, check out Waco weather in March.

In September, the weather tends to be warmer with average temperatures reaching 27°C (81°F) and maximums soaring up to 39°C (103°F), whereas April is cooler, averaging around 20°C (67°F) with maximum temperatures of 35°C (95°F). Humidity levels are also notable, with September experiencing 69% and April slightly higher at 79%. Both months see a similar amount of precipitation; September has 80 mm (3.1 in) across 7 days, while April totals 96 mm (3.8 in) over 8 days. For more detailed information, you can check Waco weather in April.

September and May showcase distinctly different weather patterns. In September, temperatures range from a minimum of 11°C (51°F) to a maximum of 39°C (103°F), with an average of 27°C (81°F). The month sees relatively moderate precipitation levels at 80 mm (3.1 in) over about 7 days, accompanied by a humidity level of 69%. In contrast, May experiences slightly cooler temperatures, with a minimum of 10°C (49°F) and an average of 24°C (76°F), peaking at 37°C (99°F). However, it has significantly higher precipitation of 184 mm (7.2 in) spread over 13 days, resulting in a higher humidity level of 81%. For a closer look at the specific weather conditions in Waco during this month, you can visit Waco weather in May.

When comparing September and June weather, several notable differences emerge. In September, the temperatures range from a minimum of 11°C (51°F) to a maximum of 39°C (103°F), with an average temperature of around 27°C (81°F). This month experiences approximately 80 mm (3.1 in) of precipitation over 7 days, coupled with a humidity level of 69%. In contrast, June presents slightly warmer conditions, with temperatures ranging from a minimum of 15°C (60°F) to a maximum of 40°C (104°F) and an average of 28°C (83°F). Although June has a similar amount of precipitation (77 mm or 3.0 in), it spans 10 days and features higher humidity at 77%. For a deeper look into the weather specifics of June, you can check out Waco weather in June.

When comparing the weather in September and July, it's clear that July tends to be warmer overall, with average temperatures around 30°C (87°F) and maximums reaching up to 44°C (111°F). In contrast, September's average temperature is slightly lower at 27°C (81°F), though it can still peak at 39°C (103°F). Precipitation is more frequent in September, with 80 mm (3.1 in) of rain over 7 days, compared to July's 51 mm (2.0 in) over 8 days. Additionally, humidity levels are marginally higher in July at 71% versus September's 69%. For more details on July weather, check out Waco weather in July.

September weather shows a notable shift compared to August. While both months experience high temperatures, September's average temperature drops to 27°C (81°F) from August's warmer 30°C (87°F), although the maximum temperature of 39°C (103°F) is slightly lower than August's peak of 41°C (106°F). Interestingly, September sees a cooler minimum temperature of 11°C (51°F), compared to the milder 20°C (68°F) in August. Precipitation remains similar in both months at around 80 mm (3.1 in) over 7 days, with September having a slightly higher humidity level of 69% versus August's 67%. For more detailed information, you can check Waco weather in August.

September tends to be warmer and sunnier, with average temperatures peaking at around 27°C (81°F) and maximums reaching as high as 39°C (103°F). However, it also sees a fair amount of rain, with about 80 mm (3.1 in) of precipitation over approximately 7 days. In contrast, October brings a noticeable drop in temperatures, averaging 21°C (70°F) and a minimum of just 3°C (37°F), though the maximum can still reach 37°C (98°F). Rainfall increases to 129 mm (5.1 in) over 8 days, and humidity also climbs slightly to 73%. For a detailed look at what to expect, check out Waco weather in October.

September weather is characterized by warm temperatures, with averages around 27°C (81°F) and a maximum reaching up to 39°C (103°F). In contrast, November brings a cooler climate, featuring average temperatures of 15°C (59°F) and dropping as low as -4°C (25°F). While September experiences around 80 mm (3.1 in) of precipitation over 7 days, November sees less rainfall at 51 mm (2.0 in), but with higher humidity at 82%. For a more detailed look at November conditions, you can check Waco weather in November.

In September, the weather is characterized by significantly warmer temperatures, with an average high of 27°C (81°F) and maximums soaring up to 39°C (103°F). The month also sees a fair amount of precipitation, totaling 80 mm (3.1 in) over about 7 days, contributing to a humidity level of 69%. In contrast, December experiences much cooler conditions, with an average high of only 12°C (54°F) and a minimum dipping to -3°C (27°F). Although there is less precipitation at 63 mm (2.5 in) over 6 days, the humidity rises to 87%, adding to the crispness of the winter air. For more details on December weather, you can visit Waco weather in December.

Compare Waco's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Waco

As summer transitions into fall, September in Waco brings a noticeable shift in weather dynamics. While temperatures can still soar, with highs peaking around 39°C (103°F), the average daily warmth feels more manageable at 27°C (81°F), providing a comfortable reprieve from the sweltering summer heat. Nights in September offer a refreshing drop, making it a pleasant time for outdoor activities. Although precipitation is less frequent, with only seven days seeing rain and an average total of 80 mm (3.1 in), the humidity remains high at 69%, lending a slight stickiness to the air. Overall, September serves as a bridge between the extremes of summer and the cooler autumn months, marking a season of transition. For more insights on the year-round weather patterns, check out Waco Climate.