September Weather in Morro Bay, United States

Last updated: February 24, 2025

In Morro Bay, United States, September showcases a pleasant climate, characterized by a maximum temperature soaring to 35°C (95°F) and an average of 18°C (65°F), which creates an inviting atmosphere for outdoor activities. With minimum temperatures dropping to a cool 11°C (53°F) at night, visitors can enjoy a crisp evening breeze. Remarkably, the month experiences virtually no precipitation, registering only 1 mm (0.0 in) over 0 rainy days, allowing for uninterrupted exploration of this coastal gem. Coupled with a humidity level of 70%, September in Morro Bay offers a refreshing yet comfortable environment, perfect for those seeking both relaxation and adventure.

September Temperature in Morro Bay

September in Morro Bay showcases a delightful transition into fall, where temperatures begin to cool while still retaining the warmth of summer. With a minimum of 11°C (53°F) and an average of 18°C (65°F), the month offers a pleasant escape from the heat. As days progress, the maximum temperature can soar up to 35°C (95°F), marking it as one of the hottest months of the year. This pattern not only highlights the lingering warmth but also signals an inviting climate for outdoor activities, making September a perfect time to enjoy the coastal beauty before the cooler autumn breezes settle in. Overall, Morro Bay in September presents a balanced blend of warmth and comfortable temperatures, ideal for exploring its stunning natural landscapes.

September Weather in Morro Bay: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Morro Bay, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec545455575862646565635954
Data source: Temperature data for Morro Bay 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 Morro Bay

In September, Morro Bay experiences a notable decline in precipitation, echoing the dry summer months that precede it. With a mere 1 mm (0.0 in) of rainfall recorded, this month aligns with the trend of minimal precipitation seen from June through August, when the area recorded no rain at all. This dry spell sets the stage for an overall precipitation pattern that peaks in the winter months, particularly in January with 110 mm (4.3 in) of rain spread over six days. The sharp contrast in rainfall amounts not only highlights Morro Bay's seasonal climate variation but also underscores the arid conditions typical of the late summer and early fall, making September one of the driest months in the region.

September Precipitation Trends in Morro Bay

The chart displays monthly precipitation patterns in Morro Bay, 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.
JanFebMarAprMayJunJulAugSepOctNovDec110808423121111113276
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Morro Bay

In Morro Bay, United States, the month of September marks a gradual decline in humidity, with levels reaching a comfortable 70%. Following the summer months, when humidity lingered around 72% in August and 75% in July, September transitions the region into a drier phase as it heads into autumn. This downward trend is part of a broader seasonal pattern; humidity peaks in the winter months like January and February, averaging around 80-83%, and steadily decreases as the year progresses. The consistent drop from the humidity highs of early winter to the more moderate levels in September highlights the area's temperate coastal climate, making it an inviting destination for those seeking a mild fall experience.

September Average Humidity in Morro Bay

This chart illustrates the average monthly humidity levels in Morro Bay, 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 Morro Bay

In September, Morro Bay experiences a UV Index of 9, classifying it as a very high exposure category with a recommended burn time of just 15 minutes. This marks a slight decline from the intense levels seen in the peak summer months of June and July, where the UV Index reached 12. However, the UV levels remain significantly elevated, reminding outdoor enthusiasts to take necessary precautions. As the year transitions into autumn, the UV Index steadily decreases, yet September still showcases a strong reminder of the sun's potential intensity. For more detailed information on UV levels throughout the year, visit Morro Bay UV Index.

Maximum UV Index Levels in Morro Bay for September

The chart shows the monthly maximum UV Index (UVI) for Morro Bay 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.
JanFebMarAprMayJunJulAugSepOctNovDec4589101212119753
Data source: Morro Bay 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 Morro Bay

As the summer sun begins to wane, September in Morro Bay offers a delightful transition with 316 hours of sunshine, ushering in a golden glow that rivals the previous months. This month experiences a gentle decline from the peak sunshine hours of July, which boasts an impressive 383 hours, yet still maintains a vibrant atmosphere. The warmth of summer lingers, casting a serene light as the landscape shifts towards autumn. Following this month, October continues the trend with slightly reduced hours at 295, hinting at the gradual retreat of daylight as winter approaches. Nonetheless, September remains a splendid time to enjoy the beaches and breathtaking coastal views, with its rich tapestry of sunlight creating perfect conditions for outdoor adventures and cozy evenings by the bay.

Monthly Sunshine Duration in Morro Bay: September Highlighted

The September sunshine duration represents the total number of hours Morro Bay 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.
JanFebMarAprMayJunJulAugSepOctNovDec179h229h284h316h368h372h383h358h316h295h246h223h
Data source: Morro Bay September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Morro Bay During September

In Morro Bay, the likelihood of sunny weather in September stands at 68%, reflecting a continuation of the summer's pleasant climate. As the year progresses, the chance of sunshine tends to fluctuate, but it generally peaks during the warmer months from May to August, where it ranges between 71% and 73%. September, while a slight dip from the height of summer, still maintains a robust opportunity for sun-soaked days, aligning closely with the 68% likelihood seen in both October and November. Overall, this trend underscores September's position as a favorable time to enjoy the coastal beauty before the cooler months take hold, offering a perfect blend of lingering summer warmth and the onset of fall.

Percentage of Sunny Days in September in Morro Bay

The chart illustrates the percentage of sunny days in Morro Bay 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 Morro Bay experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec53%69%61%57%72%73%64%71%68%68%68%50%
Data source: Morro Bay September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Morro Bay in September

As summer transitions to fall, September in Morro Bay offers a gentle reduction in daylight, with around 12 hours of sunlight. This gradual shift follows the peak summer months of June through August, where residents enjoyed 14 hours of radiant daylight. Interestingly, March heralds the arrival of longer days with 11 hours, which continues to rise as spring progresses. In September, daylight starts to wane, paving the way for the cozy embrace of autumn as daylight dips closer to 11 hours in October. The overall pattern from January's meager 10 hours to summer's peak illustrates a rhythmic cycle, beckoning the change of seasons and inviting outdoor activities as nature's palette changes.

Average Daylight Hours in Morro Bay for September

The chart illustrates the variation in daylight duration in Morro Bay throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec10h 4m10h 55m11h 59m13h 6m14h 1m14h 28m14h 13m13h 24m12h 20m11h 14m10h 17m9h 48m
Data source: Morro Bay daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Morro Bay

In Morro Bay, September marks the continuation of a trend toward calmer winds, with an average speed of just 2.1 m/s (5 mph), mirroring the gentle breezes of August. As summer transitions into fall, the coastal air remains soothingly tranquil, reflecting a gradual decline from the 3.5 m/s peak winds of January. This shift not only enhances the bay's serene atmosphere but also invites visitors to relish the stunning views and outdoor activities at a leisurely pace. As we prepare for the upcoming months, the winds are expected to pick up slightly, returning to 3.3 m/s by October, yet September stands out as a time of peaceful stillness in Morro Bay.

Average September Wind Speed in Morro Bay

The chart displays monthly wind speed patterns in Morro Bay, 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.
JanFebMarAprMayJunJulAugSepOctNovDec3.53.33.03.33.32.82.22.12.1 m/s2.92.93.1
Data source: Morro Bay September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Morro Bay Compares to Other Months

The weather in Morro Bay 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 Morro Bay and find detailed weather information for every month.

September and January exhibit stark contrasts in weather conditions. In September, temperatures range from a minimum of 11°C (53°F) to a maximum of 35°C (95°F), with an average of 18°C (65°F) and virtually no precipitation, making it a warm and dry month with a humidity level of 70%. In contrast, January experiences cooler temperatures, with a minimum of 4°C (40°F), an average of 12°C (54°F), and a maximum of 23°C (74°F). This month is notably wetter, receiving 110 mm (4.3 in) of precipitation over six days and higher humidity at 80%. These fluctuations highlight the transition from the warmth of late summer to the chill of mid-winter. For more detailed insights, refer to Morro Bay weather in January.

September and February showcase contrasting weather patterns. In September, temperatures range from a mild 11°C (53°F) at night to a scorching 35°C (95°F) during the day, with minimal precipitation and humidity at 70%. In stark contrast, February sees cooler temperatures, with lows of 4°C (39°F) and highs reaching only 25°C (77°F), alongside significant rainfall totaling 80 mm (3.2 in) over about six days and higher humidity levels at 83%. For more details on the February climate, you can check out Morro Bay weather in February.

In comparing the weather of September and March, noticeable differences emerge. September boasts warmer temperatures, with averages around 18°C (65°F) and maximums reaching 35°C (95°F), while March experiences cooler averages of 13°C (55°F) and maximums of 24°C (76°F). Additionally, September is characterized by its dry conditions, recording only 1 mm of precipitation over 0 days, while March is significantly wetter, with 84 mm of rain spread over 9 days. Humidity levels are also higher in March at 80%, compared to September’s 70%. For more detailed insights into weather patterns, check out Morro Bay weather in March.

When comparing the weather in September and April, notable differences emerge. September typically experiences warmer temperatures, with a minimum of 11°C (53°F) and an average of 18°C (65°F), peaking at a scorching 35°C (95°F). In stark contrast, April presents cooler conditions, with temperatures ranging from a minimum of 7°C (44°F) to a maximum of 26°C (80°F) and an average of 14°C (57°F). Additionally, April sees more precipitation, averaging 23 mm (0.9 in) over three days, while September remains dry with virtually no rain. Humidity levels are slightly higher in April at 76%, compared to September's 70%. For more detailed insights, you can check Morro Bay weather in April.

In September, the weather tends to be warmer, with average temperatures ranging from a minimum of 11°C (53°F) to a maximum of 35°C (95°F), while May offers cooler conditions with temperatures peaking at 25°C (77°F). September boasts very little rain, receiving only 1 mm of precipitation and none of the days feeling damp, whereas May is slightly wetter, experiencing about 12 mm of rain over two days. The humidity is somewhat similar, with September at 70% and May at 75%, but May's cooler average temperature makes for a more comfortable feel overall. For a closer look at conditions, check out Morro Bay weather in May.

In comparing the weather between September and June, September tends to be warmer, with an average temperature of 18°C (65°F) and a maximum reaching up to 35°C (95°F). In contrast, June exhibits a slightly lower average temperature of 16°C (62°F) and a maximum of 31°C (88°F). Both months experience minimal precipitation, with only 1 mm reported and no rainy days in either month. However, September's humidity level is slightly lower at 70% compared to June's 74%. This overall difference highlights September as a warmer and less humid month. For more detailed information, you can check Morro Bay weather in June.

In comparing the weather of September and July, both months exhibit mild temperatures with average highs around 18°C (65°F). September experiences slightly warmer extremes with a maximum temperature reaching 35°C (95°F), while July’s highest temperature is capped at 31°C (89°F). Precipitation levels are minimal in both months, with only 1 mm recorded and no rainy days. However, September has a lower humidity level at 70% compared to July's 75%, making September feel a bit more comfortable. For more detailed weather insights, you can explore Morro Bay weather in July.

In September, the weather in Morro Bay shows a slight increase in maximum temperatures, reaching up to 35°C (95°F), compared to August's peak of 31°C (88°F). Both months have similar average temperatures and minimal precipitation, with September slightly cooler with a minimum of 11°C (53°F) versus August's 13°C (55°F). Humidity levels are quite comparable, with September at 70% and August at 72%. For more details, you can check Morro Bay weather in August.

September and October exhibit similar humidity levels at 70%, but there are notable differences in temperature and precipitation. In September, temperatures range from a minimum of 11°C (53°F) to a maximum of 35°C (95°F), with an average of 18°C (65°F). In contrast, October sees slightly cooler temperatures, with a minimum of 9°C (49°F), an average of 17°C (64°F), and a maximum of 33°C (92°F). Additionally, October experiences a small increase in precipitation, totaling 10 mm (0.4 in), although there are still no days of measurable rain. For more detailed insights into the weather conditions, check Morro Bay weather in October.

September and November exhibit a distinct shift in weather patterns. In September, temperatures are warmer, ranging from a minimum of 11°C (53°F) to a maximum of 35°C (95°F), and the month experiences almost no precipitation, with an average humidity of 70%. In contrast, November has cooler temperatures, with a minimum of 6°C (42°F) and a maximum of 26°C (79°F), along with an increase in precipitation, totaling 32 mm (1.2 in) over three days, and slightly higher humidity at 74%. For more details on November weather, you can check Morro Bay weather in November.

September typically boasts warmer temperatures, with average highs reaching up to 35°C (95°F) and minimal precipitation, yielding a dry and humid atmosphere. In contrast, December ushers in cooler weather, with average highs of just 23°C (74°F) and significant rainfall totaling 76 mm (3.0 in) over approximately six days. The humidity in December is slightly higher at 76%, contributing to a more damp and chilly feel compared to the warmth and dry air of September. For more detailed information, you can check out Morro Bay weather in December.

Compare Morro Bay's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Morro Bay

As September rolls into Morro Bay, the weather marks a delightful transition into a milder climate, setting it apart from the sweltering summer months. With a warm average temperature and a striking absence of rain, this period is characterized by comfortable conditions that invite outdoor activities without the humidity that often accompanies the peak summer heat. Moreover, the consistent temperatures create a pleasant atmosphere, making it a perfect time for visitors and locals alike to enjoy the stunning coastal scenery. For those looking to explore more about Morro Bay's unique climate patterns, check out Morro Bay Climate.