September Weather in Coronado, United States

Last updated: February 24, 2025

Experience the charming September weather in Coronado, United States, where the average temperature hovers around 21°C (70°F). Enjoy warm days peaking at a delightful 31°C (88°F), while nights remain comfortably cool, with minimum temperatures falling to 17°C (62°F). With 0 days of precipitation and only 3 mm (0.1 in) of rain for the month, this coastal paradise offers perfect conditions for outdoor activities. The 52% humidity adds to the pleasant atmosphere, making September an ideal time to soak up the sun and explore all that Coronado has to offer!

September Temperature in Coronado

In September, Coronado experiences a delightful transition into autumn, featuring a warm minimum temperature of 17°C (62°F) and a comfortable average of 21°C (70°F). As the month progresses, temperatures can peak at a balmy 31°C (88°F), offering plenty of sunshine and pleasant beach days. This mix of warmth and comfort signifies a subtle shift from the summer heat, with September standing out as a month where outdoor activities thrive. The temperatures in this month not only make it ideal for beachgoers but also showcase a gradual cooling trend as the year draws to a close, paving the way for the cooler October ahead.

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

The chart illustrates September temperature patterns in Coronado, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec575758616265697170686358
Data source: Temperature data for Coronado 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 Coronado

In September, the weather in Coronado typically ushers in a brief interlude of dryness, with precipitation amounting to just 3 mm (0.1 in) over the month. Notably, this scant rainfall comes with no recorded precipitation days, highlighting its position as a transitional period towards the wetter months ahead. The trend shows a marked decline in rainfall starting in late spring and throughout the summer, with September continuing this dry spell. However, it is followed by a gradual increase in precipitation as autumn sets in, with October showing a slight uptick to 13 mm (0.5 in), suggesting that the region is poised for a return to more varied weather in the coming months.

September Precipitation Trends in Coronado

The chart displays monthly precipitation patterns in Coronado, 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.
JanFebMarAprMayJunJulAugSepOctNovDec45553820162114132460
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Coronado

In September, Coronado experiences a noticeable shift in humidity, with levels sitting at 52%. This marks a small increase from the summer months, where humidity levels dipped to as low as 42% in August, reflecting the drier heat typical of the season. As autumn approaches, the humidity begins to rise, setting the stage for the gradual transition into the wetter months of the year. Compared to the earlier part of the year, where humidity peaked at 77% in February, September's levels represent a balanced midpoint, allowing residents and visitors to enjoy the pleasant climate without the intense mugginess of late spring and early summer. Overall, the September humidity serves as a gentle reminder of the shifting seasons, blending the lingering warmth of summer with the freshness of fall.

September Average Humidity in Coronado

This chart illustrates the average monthly humidity levels in Coronado, 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.
JanFebMarAprMayJunJulAugSepOctNovDec72%77%67%56%46%48%46%42%52%58%66%74%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Coronado

In September, Coronado experiences a very high UV Index of 10, indicating that sun exposure carries considerable risk, particularly for those who are sensitive to UV rays. With a burn time of just 15 minutes, it’s essential for residents and visitors alike to take protective measures when enjoying the outdoors. This level of UV intensity follows the trend of the preceding summer months, where the index peaked at 11 in May through July, and it remains elevated into early autumn. As the months progress into October, the UV Index drops to 7, transitioning into a high exposure category, which will allow for longer outdoor activities with reduced risk. To stay informed about the UV levels and protect your skin, check out the detailed guide at Coronado UV Index.

Maximum UV Index Levels in Coronado for September

The chart shows the monthly maximum UV Index (UVI) for Coronado 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.
JanFebMarAprMayJunJulAugSepOctNovDec468101111111010754
Data source: Coronado 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 Coronado

As summer transitions to autumn, September in Coronado shines brightly with an impressive 318 hours of sunshine. This month signals a subtle decline from the peak summer months, where July basked in a gorgeous 376 hours. However, September still holds its ground, outshining the early months of the year, such as January with a mere 195 hours. As daylight begins to wane, the lingering warmth of summer offers a delightful retreat, making Coronado a perfect escape for those wanting to soak up the sun before the cooler months set in. The trend showcases a gradual glide from the lush summer brightness towards the crisper autumn ambiance, reminding us of nature's rhythmic dance.

Monthly Sunshine Duration in Coronado: September Highlighted

The September sunshine duration represents the total number of hours Coronado 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.
JanFebMarAprMayJunJulAugSepOctNovDec195h243h299h325h361h366h376h361h318h297h257h231h
Data source: Coronado September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Coronado During September

September in Coronado boasts a promising 63% chance of sunny weather, tying it with the more wintery months of January, March, and November. This statistic highlights a consistent appeal for those looking to bask in the California sun as summer gracefully transitions into fall. Interestingly, September's sun probability mirrors that of the peak winter months, suggesting that the warm, inviting weather remains a staple of Coronado's charm. While the chance of sun dips in the spring, it steadily increases toward the end of summer, setting the stage for delightful outdoor activities and beach outings. With sunshine likely to grace the skies, September offers an excellent opportunity for visitors and locals alike to enjoy the beauty of Coronado.

Percentage of Sunny Days in September in Coronado

The chart illustrates the percentage of sunny days in Coronado 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 Coronado experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec63%62%63%50%42%47%56%60%63%64%63%47%
Data source: Coronado September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Coronado in September

As September unfolds in Coronado, the length of daylight begins to wane, offering a gentle transition from the vibrant summer months. With approximately 12 hours of daylight, the sun starts to set earlier, hinting at the arrival of autumn. Following a peak in June and July, where daylight reached a blissful 14 hours, September marks a subtle retreat towards the shorter days of fall. The pattern established from January to September illustrates a steady increase in daylight, peaking in summer, and now gracefully tapering off towards the cool, cozy days of October and November, which will each bring around 11 hours of sunlight. This rhythm of changing light captivates the spirit, encouraging outdoor activities while providing a picturesque backdrop for the interplay of summer's warmth and autumn's charm.

Average Daylight Hours in Coronado for September

The chart illustrates the variation in daylight duration in Coronado throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec10h 15m11h 1m12h13h13h 50m14h 15m14h 1m13h 16m12h 19m11h 19m10h 27m10h 1m
Data source: Coronado daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Coronado

As September rolls in, Coronado welcomes a gentle average wind speed of 3.1 m/s (7 mph), consistent with the breezy summer months that have preceded it. This steadiness underscores a trend of relatively mild winds during the latter part of the year, with September mirroring the prior months of June, July, and August. However, a subtle decline in wind speed begins to emerge as the season transitions into fall, with October and November witnessing drops to 2.8 m/s (6 mph) and 2.4 m/s (5 mph), respectively. This predictable pattern offers a soothing atmosphere, perfect for outdoor activities, as the winds remain reliable yet gentle, providing a refreshing backdrop to Coronado's stunning coastal scenery.

Average September Wind Speed in Coronado

The chart displays monthly wind speed patterns in Coronado, 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.
JanFebMarAprMayJunJulAugSepOctNovDec3.02.73.43.23.13.33.13.13.1 m/s2.82.43.2
Data source: Coronado September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Coronado Compares to Other Months

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

September typically boasts warmer temperatures with an average of 21°C (70°F) and highs reaching up to 31°C (88°F), while January experiences cooler averages around 14°C (58°F) and maximums of 25°C (77°F). Precipitation is minimal in September, with only 3 mm and no rainy days, contrasting sharply with January, which sees about 45 mm of rain across five days. Additionally, humidity levels are notably higher in January at 72%, compared to a more comfortable 52% in September. For more details, you can check Coronado weather in January.

September and February offer contrasting weather experiences. In September, temperatures range from a pleasant minimum of 17°C (62°F) to a maximum of 31°C (88°F), while enjoying minimal precipitation and humidity at 52%. This makes it a warm and dry time of year, ideal for outdoor activities. In stark contrast, February features cooler conditions with a minimum of 7°C (45°F) and an average of 14°C (57°F), peaking at 26°C (79°F). The month sees significantly more rain, with 55 mm (2.2 in) falling over approximately 6 days, contributing to a higher humidity level of 77%. For more details on February weather specifically, you can check Coronado weather in February.

September and March present contrasting weather patterns. September boasts warmer temperatures with a minimum of 17°C (62°F) and an average of 21°C (70°F), peaking at a maximum of 31°C (88°F). The month is notably dry, with only 3 mm (0.1 in) of precipitation and no rainy days, accompanied by a moderate humidity level of 52%. In contrast, March experiences cooler conditions, starting at a minimum of 8°C (47°F) and averaging 15°C (59°F), with a maximum of 26°C (80°F). This month is significantly wetter, recording 38 mm (1.5 in) of rain over 8 rainy days and higher humidity at 67%. For more detailed information, check out Coronado weather in March.

In September, the weather is generally warmer with average temperatures around 21°C (70°F) and maximums reaching up to 31°C (88°F). The month is characterized by very little precipitation, with only 3 mm recorded and no rainy days, resulting in relatively low humidity levels at 52%. In contrast, April boasts cooler temperatures, averaging 16°C (61°F) and peaking at 29°C (84°F). This month sees a higher level of precipitation at 20 mm over 2 rainy days, accompanied by slightly higher humidity of 56%. For more detailed insights, you can check Coronado weather in April.

In comparing the weather conditions of September and May, September features warmer temperatures with an average of 21°C (70°F) and highs reaching up to 31°C (88°F), making it a prime month for outdoor activities. In contrast, May is cooler, with an average temperature of 17°C (62°F) and a maximum of 25°C (78°F). September enjoys significantly less precipitation, with only 3 mm (0.1 in) and no rainy days, while May sees a total of 16 mm (0.6 in) over four days, contributing to slightly higher humidity levels at 46%. For more details about the weather in May, you can visit Coronado weather in May.

September and June exhibit interesting differences in weather patterns. September generally enjoys warmer temperatures, with a minimum of 17°C (62°F), an average of 21°C (70°F), and a maximum of 31°C (88°F), compared to June's lower minimum of 14°C (58°F), average of 18°C (65°F), and maximum of 29°C (84°F). Both months experience minimal rainfall, with September receiving 3 mm (0.1 in) and June slightly less at 2 mm (0.1 in), and neither month sees any precipitation days. Humidity levels in September are slightly higher at 52%, while June maintains a comfortable 48%. For more specific information about June temperatures, check out Coronado weather in June.

In comparing the weather between September and July, both months exhibit mild temperatures with averages hovering around 21°C (70°F). However, September tends to be slightly warmer, boasting a maximum temperature of 31°C (88°F) compared to July's 29°C (85°F). Notably, September has minimal precipitation, similar to July, with only 3 mm (0.1 in) in September and just 1 mm (0.1 in) in July, both recorded on zero days. Additionally, September's humidity is higher at 52%, while July enjoys a slightly drier feel with 46% humidity. For more detailed information on July weather patterns, you can check Coronado weather in July.

In comparing the weather conditions of September and August, we see that both months maintain a similar temperature range, with September experiencing a slightly higher maximum temperature of 31°C (88°F) compared to August's 29°C (84°F). Both months have a minimum temperature of 17°C (62°F), leading to an average temperature that remains quite stable, at 21°C (70°F) for September and 21°C (71°F) for August. Notably, September recorded minimal precipitation with only 3 mm (0.1 in) over the month and no rainy days, while August had even less at 1 mm (0.0 in) and also saw no rain. Humidity levels are somewhat higher in September at 52%, compared to August's 42%, indicating that while both months are dry, September feels slightly more humid. For more details on August weather, you can refer to Coronado weather in August.

September typically boasts warmer temperatures, with an average of 21°C (70°F) and a maximum of 31°C (88°F), making it feel quite pleasant. In contrast, October sees a slight drop in the average temperature to 20°C (68°F), although the maximum can still reach an impressive 32°C (90°F). While September enjoys dry conditions with no recorded precipitation, October experiences a little more rainfall, totaling 13 mm (0.5 in) over two days. Additionally, humidity increases slightly in October to 58%, compared to September's 52%. For more details, check out Coronado weather in October.

September typically enjoys warmer and drier weather, with temperatures ranging from a minimum of 17°C (62°F) to a maximum of 31°C (88°F), and virtually no precipitation. The humidity is relatively comfortable at 52%. In contrast, November cools down significantly, featuring average temperatures between a minimum of 10°C (51°F) and a maximum of 27°C (81°F). This month also sees increased precipitation at 24 mm (0.9 in) over about two rainy days, along with higher humidity levels at 66%. For a detailed look at what to expect during this time, check out Coronado weather in November.

September typically features warmer temperatures, with a minimum of 17°C (62°F) and an average of 21°C (70°F), peaking at a maximum of 31°C (88°F). The month is relatively dry, experiencing only 3 mm (0.1 in) of precipitation and boasting a low humidity level of 52%. In contrast, December brings cooler temperatures, with a minimum of 8°C (47°F) and an average of 15°C (59°F), reaching a maximum of 24°C (76°F). The weather is notably wetter, averaging 60 mm (2.4 in) of rain over 5 days, and the humidity increases to 74%. For more detailed information, visit Coronado weather in December.

Compare Coronado's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Coronado

As summer transitions into autumn, September in Coronado offers a delightful reprieve from the sweltering heat, characterized by pleasantly warm days and cooler nights. Visitors can expect averages around 21°C (70°F), with the rare chance of rain, making it an ideal time for outdoor activities. Unlike the hotter months preceding it, September's weather boasts a comfortable 52% humidity, creating a refreshing atmosphere perfect for enjoying the beach and local festivities. To learn more about the distinct climate patterns throughout the year, explore the full details on Coronado Climate.