September Weather in Paso Robles, United States

Last updated: February 24, 2025

In September, Paso Robles experiences a delightful range of temperatures, with maximums reaching up to 40°C (104°F), making it a great time for outdoor activities. The average temperature hovers around 21°C (70°F), while nights can be pleasantly cool with a minimum of 8°C (46°F). Remarkably, this month sees virtually no rain, with only 1 mm of precipitation recorded over 0 days, allowing for uninterrupted enjoyment of the stunning landscape. However, humidity levels are relatively high at 70%, adding a touch of warmth to the already sunny and vibrant atmosphere, perfect for wine tasting and exploring the wine country.

September Temperature in Paso Robles

In Paso Robles during September, temperatures begin to pivot towards the warmth of autumn, showcasing a delightful range. The month greets with a minimum of 8°C (46°F) during the cooler mornings, gradually climbing to an average of 21°C (70°F) by midday. As the sun blazes down, September can peak at an impressive 40°C (104°F), hinting at the lingering heat of summer. This transition marks a unique blend of cooler evenings and toasty afternoons, making it a perfect time for outdoor activities and gatherings, while inviting residents and visitors alike to bask in the vibrant Californian climate.

September Weather in Paso Robles: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Paso Robles, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec505153596369727270635549
Data source: Temperature data for Paso Robles 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 Paso Robles

In Paso Robles, United States, the month of September marks a notable shift in the precipitation trend, with only 1 mm (0.0 in) recorded and zero precipitation days. This stark contrast to the wetter months earlier in the year, such as January with 89 mm and February with 63 mm, highlights a significant dry spell during the summer. Following a prolonged period without rainfall from June through August, the scant September precipitation underscores the region's characteristic climate, poised between lush early months and the drier fall. As the year progresses, precipitation begins to tick upward again in October, reminding residents of the approaching rainy season.

September Precipitation Trends in Paso Robles

The chart displays monthly precipitation patterns in Paso Robles, 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.
JanFebMarAprMayJunJulAugSepOctNovDec8963721910000172560
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Paso Robles

As summer fades into autumn, September in Paso Robles ushers in a notable shift in humidity levels. After experiencing higher humidity from January through August, where averages hovered between 72% and 83%, September stands out with a decrease to 70%. This gradual decline highlights a trend towards drier conditions as the region transitions into fall. Following the culmination of hot summer months, residents and visitors alike can enjoy a more comfortable atmosphere, setting the stage for the rich experiences of harvest season and cooler, invigorating days ahead. While the humidity remains consistent at 70% through October, this slight dip reflects the region's characteristic climate change, making September a pleasant time to explore the picturesque landscapes of Paso Robles.

September Average Humidity in Paso Robles

This chart illustrates the average monthly humidity levels in Paso Robles, 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%83%80%76%75%74%75%72%70%70%74%77%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Paso Robles

As September rolls around in Paso Robles, the UV Index reflects a significant transition in sunlight intensity, dipping slightly to 9, categorizing it as very high and resulting in a burn time of just 15 minutes. This decrease from the extreme levels of summer months like July and August, which both peaked at 12, marks a gradual retreat from the most intense UV exposure. However, the lingering warmth of late summer means that caution is still essential for sun safety, as the UV Index remains elevated compared to the cooler months ahead. By understanding these trends, residents and visitors can better prepare for outdoor activities and enjoy the beautiful Paso Robles scenery while taking necessary precautions. For detailed UV forecasts, check out Paso Robles UV Index.

Maximum UV Index Levels in Paso Robles for September

The chart shows the monthly maximum UV Index (UVI) for Paso Robles 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.
JanFebMarAprMayJunJulAugSepOctNovDec4589111212119753
Data source: Paso Robles 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 Paso Robles

As summer transitions into fall, September in Paso Robles boasts a delightful 317 hours of sunshine, gracefully tapering from the peak of 387 hours in July. This month reflects a soothing balance, maintaining ample sunlight that crafts the perfect backdrop for outdoor activities and vineyard visits. The trend of gradually diminishing daylight from the height of summer begins, yet the sunshine remains more than generous compared to the colder months ahead. As the days shorten, they signal the arrival of autumn’s charm while still allowing plenty of time to soak in the golden rays, setting the stage for the harvest season in this picturesque locale.

Monthly Sunshine Duration in Paso Robles: September Highlighted

The September sunshine duration represents the total number of hours Paso Robles 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.
JanFebMarAprMayJunJulAugSepOctNovDec175h227h282h315h370h376h387h359h317h295h244h221h
Data source: Paso Robles September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Paso Robles During September

As summer transitions to fall, Paso Robles maintains a commendable 83% chance of sunny weather in September. This month showcases a slight dip from the peak sunny days of August, which boasts an impressive 88%, yet it remains well above average compared to the earlier months of the year. With an upward trend in sunny days from May (86%) through August, September clearly benefits from this seasonal warmth and is positioned favorably as the region enjoys the tail end of summer. As October rolls in, the likelihood of sunshine decreases to 69%, making September a prime time to soak up those golden rays before autumn arrives.

Percentage of Sunny Days in September in Paso Robles

The chart illustrates the percentage of sunny days in Paso Robles 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 Paso Robles experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec53%65%59%66%86%86%81%88%83%69%67%47%
Data source: Paso Robles September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Paso Robles in September

As September rolls into Paso Robles, the daylight hours begin to wane, offering a gentle transition from the vibrant summer months. Following a peak of 14 hours of sunlight during the height of June and July, the days shorten gradually to 12 hours in September. This decline marks a shift from the long, sun-drenched days of summer, as autumn prepares to unveil its golden hues. The gradual decrease in daylight not only signals the approach of cooler weather but also invites a cozy atmosphere, perfect for harvest festivities and outdoor gatherings. With October on the horizon, the pattern of diminishing daylight continues, hinting at the cozy evenings that lie ahead.

Average Daylight Hours in Paso Robles for September

The chart illustrates the variation in daylight duration in Paso Robles throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec10h 2m10h 54m11h 59m13h 7m14h 3m14h 30m14h 15m13h 25m12h 20m11h 13m10h 15m9h 46m
Data source: Paso Robles daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Paso Robles

As summer gives way to autumn in Paso Robles, September is marked by a gentle decline in wind speeds, averaging only 1.6 m/s (4 mph). This subtle shift reflects a trend observed throughout the warmer months, where the winds gradually slacken, reaching their lowest point in September before picking up again in October. While January through June maintain a consistent breeze around 2.1 to 2.3 m/s (5 mph), the late summer months show a noticeable decrease, culminating in the soft whisper of September winds. This tranquil atmosphere sets the stage for the harvest season, inviting a sense of calm and reflection as the landscape transitions into fall.

Average September Wind Speed in Paso Robles

The chart displays monthly wind speed patterns in Paso Robles, 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.
JanFebMarAprMayJunJulAugSepOctNovDec2.32.12.12.12.32.11.91.71.6 m/s2.21.92.2
Data source: Paso Robles September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Paso Robles Compares to Other Months

The weather in Paso Robles 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 Paso Robles and find detailed weather information for every month.

In September, Paso Robles experiences pleasantly warm temperatures, ranging from a minimum of 8°C (46°F) to a maximum of 40°C (104°F), with an average of 21°C (70°F). This month typically sees very little precipitation, averaging only 1 mm, with no rainy days and a humidity level around 70%. In contrast, January brings a significant drop in temperatures, with minimums plummeting to -2°C (29°F) and a maximum of 23°C (74°F), and an average of just 10°C (50°F). This winter month is much wetter, receiving about 89 mm (3.5 in) of precipitation over approximately 6 days, accompanied by higher humidity at 80%. For more detailed insights on January weather, visit Paso Robles weather in January.

September and February exhibit striking differences in weather patterns. September enjoys a warm climate, with average temperatures around 21°C (70°F) and a maximum reaching up to 40°C (104°F), while precipitation is scarce, totaling just 1 mm. In contrast, February presents a cooler atmosphere with average temperatures dropping to 10°C (51°F) and nighttime lows plunging to -3°C (27°F). Additionally, February experiences much more rainfall, averaging 63 mm over about seven days, and higher humidity levels at 83%. For a detailed look at the February climate, you can check Paso Robles weather in February.

September weather reveals a significant warmth, with average temperatures hovering around 21°C (70°F) and maximums reaching up to 40°C (104°F). The month is characterized by minimal precipitation, with just 1 mm recorded over no rainy days, and a moderate humidity level of 70%. In contrast, March brings a cooler climate, with average temperatures of 12°C (53°F) and maximums reaching only 27°C (82°F). This month experiences considerably higher rainfall, totaling 72 mm over 8 days, and humidity rises slightly to 80%. For a more detailed view of March conditions, you can check out Paso Robles weather in March.

In comparing the weather of September and April, a clear distinction in temperature and precipitation emerges. September boasts warmer temperatures, ranging from a minimum of 8°C (46°F) to a sweltering maximum of 40°C (104°F), with an average of 21°C (70°F). In contrast, April is significantly cooler, with temperatures ranging from a low of 3°C (37°F) to a maximum of 33°C (91°F) and an average of 15°C (59°F). Additionally, while September enjoys a dry spell with only 1 mm of precipitation over 0 days, April experiences a bit more moisture, accumulating 19 mm over 3 days. Humidity levels are also higher in April at 76%, compared to September's 70%. For more detailed insights into April weather conditions, you can visit Paso Robles weather in April.

September typically showcases warmer weather compared to May, with average temperatures reaching around 21°C (70°F) and occasional highs soaring to 40°C (104°F). In contrast, May experiences cooler conditions, with an average temperature of 17°C (63°F) and maximums capping at 33°C (92°F). While September is mostly dry with no recorded precipitation, May sees some rainfall, averaging 10 mm (0.4 in) over two days. Additionally, September is slightly more humid at 70% compared to May's 75%. For more details on the weather in May, you can check Paso Robles weather in May.

In comparing the weather of September and June, both months showcase similar average temperatures around 21°C (70°F), but September can experience higher maximum temperatures, reaching up to 40°C (104°F), while June peaks at 37°C (99°F). Interestingly, both months report negligible precipitation, with September having 1 mm and June remaining completely dry, as indicated by the 0 mm recorded. Humidity levels are slightly lower in September at 70% compared to 74% in June, suggesting that June may feel slightly more humid despite its similar temperature range. For more details on June weather, you can check out Paso Robles weather in June.

In September, temperatures range from a minimum of 8°C (46°F) to a maximum of 40°C (104°F), with an average temperature of 21°C (70°F). The month is characterized by very low precipitation, receiving only 1 mm (0.0 in) and experiencing no rainy days, while humidity hovers around 70%. In contrast, July features slightly higher minimum and average temperatures, with a minimum of 12°C (53°F), an average of 22°C (72°F), and a maximum of 39°C (102°F). Like September, July also sees no precipitation, but with a humidity level of 75%, it feels a bit more humid. For more detailed insights on July weather, you can check Paso Robles weather in July.

In September, the weather in Paso Robles exhibits a notable shift compared to August. The minimum temperature drops to 8°C (46°F), creating a cooler ambiance, while the average temperature remains slightly lower at 21°C (70°F) compared to August's average of 22°C (72°F). The maximum temperature in September reaches a high of 40°C (104°F), slightly surpassing August's peak of 39°C (103°F). Both months experience very little precipitation, with September receiving only 1 mm and no rainy days, similar to August's dry conditions. Humidity levels are relatively comparable, with September at 70% and August at 72%. For a more detailed look at August's conditions, check out Paso Robles weather in August.

September and October exhibit distinct weather characteristics. In September, the temperatures range from a minimum of 8°C (46°F) to a maximum of 40°C (104°F), with an average temperature of 21°C (70°F) and virtually no precipitation. In contrast, October sees a slight drop in temperatures, with a minimum of 5°C (41°F), an average of 17°C (64°F), and a maximum of 35°C (95°F). While October remains relatively dry with only 7 mm (0.3 in) of precipitation, the persistent humidity stays at 70% for both months. For more details on the weather in October, you can visit Paso Robles weather in October.

September and November showcase a significant contrast in weather patterns. In September, temperatures can soar with a minimum of 8°C (46°F) and highs reaching up to 40°C (104°F), while average temperatures hover around a pleasant 21°C (70°F). Additionally, this month is characterized by an absence of precipitation and 70% humidity. In contrast, November experiences cooler temperatures, with a minimum of 0°C (32°F) and an average of 13°C (56°F), peaking at 27°C (81°F). This month also sees increased humidity at 74% and 25 mm (1.0 in) of precipitation over just two days. For more detailed insights, you can visit Paso Robles weather in November.

In September, the weather is typically warm, with average temperatures around 21°C (70°F) and maximum highs reaching up to 40°C (104°F). The month experiences little to no precipitation, maintaining a dry and humid atmosphere with 70% humidity. In contrast, December brings a significant drop in temperatures, averaging around 10°C (49°F) and peaking at 25°C (78°F), with minimums dipping to -2°C (29°F). This month is also much wetter, with about 59 mm (2.3 in) of rain over six days, and humidity levels slightly higher at 76%. For more detailed information about December's weather, you can visit Paso Robles weather in December.

Compare Paso Robles's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Paso Robles

September in Paso Robles brings a delightful transition, marked by warmer temperatures and a dry atmosphere. With its peak warmth often reaching well into the 40s (°C), this month stands out for its lack of precipitation, creating a contrast to the milder and wetter months of spring and early summer. The average temperature hovers around a comfortable 21°C (70°F), making it an ideal time for outdoor activities. The humidity level stays relatively high at 70%, adding a touch of warmth to the evenings. For a deeper insight into the weather trends throughout the year, explore Paso Robles Climate.