September Weather in Oceanside, United States

Last updated: February 24, 2025

September in Oceanside, United States, offers a delightful blend of warmth and mild conditions. With maximum temperatures peaking at 34°C (93°F) and an average of 22°C (72°F), residents and visitors can enjoy the sun without feeling overwhelmed. The minimum temperature dips to a comfortable 15°C (60°F), providing a pleasant evening atmosphere. Rainfall is quite sparse, with only 3 mm (0.1 in) of precipitation recorded over just 1 day of the month, ensuring mostly dry and enjoyable outings. Humidity levels hover around 68%, contributing to a refreshing coastal feel that characterizes this vibrant seaside locale. Embrace the warmth and light that September brings to Oceanside!

September Temperature in Oceanside

In September, Oceanside, United States, experiences a delightful transition in temperatures, highlighting the last whispers of summer before autumn sets in. With a minimum of 15°C (60°F) and an average of 22°C (72°F), the warm days encourage outdoor activities on the beach and strolls along the coast. The maximum temperature can reach an inviting 34°C (93°F), perfect for those wanting to soak up the sun's rays. This month stands out as a comfortable blend of warmth, making it ideal for both locals and visitors to enjoy the vibrant coastal scenery before the cooler months roll in. Overall, September encapsulates a season of warmth and transition, reminding everyone of the sun-kissed days that have just passed.

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

The chart illustrates September temperature patterns in Oceanside, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec585759616266717271696459
Data source: Temperature data for Oceanside 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 Oceanside

In Oceanside, September's weather remains characteristic of the late summer, featuring a mere 3 mm (0.1 in) of precipitation over just one day. This slight uptick follows an exceptionally dry August, where only 1 mm was recorded, resulting in a month marked by predominantly sunny skies. As we transition into fall, this minimal September rainfall aligns with the overall trend of decreasing precipitation from the spring months, where January through March exhibit more significant rainfall, peaking at 54 mm (2.1 in) in January. The pattern highlights Oceanside's predominantly dry summer months, with rainfall gradually returning as the season changes, but for now, September maintains a whisper of moisture amid the lingering warmth.

September Precipitation Trends in Oceanside

The chart displays monthly precipitation patterns in Oceanside, 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.
JanFebMarAprMayJunJulAugSepOctNovDec54564523143313102163
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Oceanside

In Oceanside, United States, September experiences a slight dip in humidity, averaging 68%, which marks the continuation of a downward trend following the summer months. After peaking at 79% in February, the humid conditions steadily decreased towards the end of summer with August recording 69%. This gradual decline hints at the arrival of autumn, where temperatures begin to cool and the moisture in the air starts to lessen. As the year progresses into October with a further drop to 67%, it's evident that the region shifts toward a more temperate climate, presenting a refreshing change after the warmer, more humid months.

September Average Humidity in Oceanside

This chart illustrates the average monthly humidity levels in Oceanside, 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.
JanFebMarAprMayJunJulAugSepOctNovDec74%79%75%71%70%72%73%69%68%67%68%71%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Oceanside

In September, Oceanside experiences a UV Index of 10, classifying the exposure as very high with a burn time of just 15 minutes. This trend mirrors the peak summer months, with June through August showcasing similar extreme levels of UV radiation. Following the sizzling summer, September maintains a robust index, signaling that sun protection remains crucial for beachgoers and outdoor enthusiasts. As the year progresses, a notable decline is observed in the UV index, dropping to 7 in October and further easing into more moderate levels by late fall and winter. It's essential to stay informed about these changes to enjoy the sunny Californian weather safely. For more details on the UV Index in Oceanside, check out Oceanside UV Index.

Maximum UV Index Levels in Oceanside for September

The chart shows the monthly maximum UV Index (UVI) for Oceanside 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.
JanFebMarAprMayJunJulAugSepOctNovDec468101112111010754
Data source: Oceanside 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 Oceanside

As the summer winds down, September in Oceanside continues to bask in the warmth of the sun, boasting 314 hours of sunshine. This month, while slightly less radiant than July's peak of 376 hours, still holds onto a vibrant glow that invites beachgoers and outdoor enthusiasts alike. Following a steady ascent from the year's start, sunshine hours hit their prime in the summer months before gradually tapering off into the fall. Compared to the previous month, September's sunshine presence remains impressive, showcasing a trend of abundant sunshine that characterizes the coastal charm of this beautiful locale. With days now growing shorter, the lingering warmth of September makes for a perfect transition into the softer hues of autumn.

Monthly Sunshine Duration in Oceanside: September Highlighted

The September sunshine duration represents the total number of hours Oceanside 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.
JanFebMarAprMayJunJulAugSepOctNovDec189h238h291h317h347h363h376h359h314h292h254h225h
Data source: Oceanside September Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Oceanside During September

In Oceanside, September offers a 58% chance of sunny weather, making it a favorable month for outdoor activities. This figure reflects a slight increase from the summer months of July (53%) and August (56%), suggesting that as summer transitions into fall, the prevalence of sunny days remains relatively robust. Interestingly, this trend continues into October, where the likelihood of sunshine rises to 63%. Overall, while September may not boast the highest sunshine probability, it comfortably fits within a promising range, contributing to a delightful early autumn experience for both locals and visitors.

Percentage of Sunny Days in September in Oceanside

The chart illustrates the percentage of sunny days in Oceanside 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 Oceanside experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec59%59%62%47%34%45%53%56%58%63%63%46%
Data source: Oceanside September chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Oceanside in September

As summer fades into fall in Oceanside, United States, September marks a gentle transition with 12 hours of daylight. This gradual decrease in sunlight follows the peak of summer, where June and July bask in 14 hours of bright skies. After the warmth of August, which also enjoys 13 hours, the daylight begins to wane, hinting at the approach of autumn. Traditionally, September serves as a bridge, blending the long, sun-drenched days of summer with the shorter, cozier hours that characterize the coming months. Following September, the daylight descends further to 11 hours in October, establishing a rhythmic ebb toward the winter months. This subtle decrease invites a refreshing change, as nature prepares for the seasonal shift ahead.

Average Daylight Hours in Oceanside for September

The chart illustrates the variation in daylight duration in Oceanside throughout the year, with September highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec10h 13m11h12h13h 1m13h 52m14h 18m14h 4m13h 18m12h 19m11h 18m10h 25m9h 58m
Data source: Oceanside daylight hours, calculated by summing the hours between sunrise and sunset for each day.

September Winds in Oceanside

As summer wanes and September unfolds in Oceanside, the average wind speed settles at a gentle 2.3 m/s (5 mph), mirroring the calm breezes of the previous two months. This tranquil wind pattern reflects a steady trend seen throughout the year, with only slight variations from month to month. Notably, winds are at their peak in the cooler months of January and March, where they reach up to 2.9 m/s (7 mph). By contrast, the warmer months from June to August experience a soft decline, culminating in the mild September air that invites residents and visitors alike to enjoy the serene coastal atmosphere. As we move into the autumn months, the winds show a subtle resilience, hinting at a calm transition toward the invigorating breezes of winter.

Average September Wind Speed in Oceanside

The chart displays monthly wind speed patterns in Oceanside, 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.
JanFebMarAprMayJunJulAugSepOctNovDec2.72.22.92.82.72.52.32.32.3 m/s2.42.02.9
Data source: Oceanside September wind data, generated using information from the Copernicus Climate Change Service.

How September Weather in Oceanside Compares to Other Months

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

September weather tends to be warm and pleasant, with temperatures ranging from a minimum of 15°C (60°F) to a maximum of 34°C (93°F), and an average of 22°C (72°F). The month experiences very little rainfall, with only 3 mm (0.1 in) over just one day, resulting in a humidity level of 68%. In contrast, January brings cooler temperatures, with a minimum of 8°C (47°F) and a maximum of 27°C (82°F), averaging around 14°C (58°F). This month sees much more precipitation, totaling 54 mm (2.1 in) across five days, and a slightly higher humidity of 74%. For more details on January weather, you can visit Oceanside weather in January.

September boasts warmer temperatures, with averages around 22°C (72°F) and a maximum soaring up to 34°C (93°F), while February cools down significantly, averaging just 14°C (58°F) and peaking at 25°C (78°F). The transition into February also brings a marked increase in precipitation, with February experiencing around 56 mm (2.2 in) over six days, compared to a considerably dry September with only 3 mm (0.1 in) over a single day. Additionally, February tends to be more humid, averaging 79% humidity compared to September's 68%. For a detailed overview of what to expect, check out Oceanside weather in February.

September and March present quite contrasting weather conditions. In September, temperatures range from a mild minimum of 15°C (60°F) to a warm maximum of 34°C (93°F), with an average of 22°C (72°F). This month experiences minimal precipitation, averaging just 3 mm (0.1 in) over only 1 day, while humidity sits at 68%. In contrast, March offers cooler temperatures, with a minimum of 9°C (48°F) and a maximum of 24°C (75°F), culminating in an average of 15°C (59°F). This month sees significantly more rainfall, with 45 mm (1.8 in) spread across about 9 days, and humidity is slightly higher at 75%. For more detailed insights, check out Oceanside weather in March.

When comparing the weather in September and April, notable differences emerge in both temperature and precipitation. September tends to be warmer, with average temperatures reaching 22°C (72°F) and highs of up to 34°C (93°F), whereas April has a cooler average of 16°C (61°F) and maximum temperatures of 29°C (85°F). Additionally, September experiences much less rainfall, with only 3 mm (0.1 in) over about 1 day compared to April's 23 mm (0.9 in) across 3 days. Humidity levels are relatively similar, with September at 68% and April slightly higher at 70%. For more detailed insights, check out Oceanside weather in April.

When comparing the weather in September and May, it's clear that September tends to be warmer and drier. In September, temperatures range from a minimum of 15°C (60°F) to a maximum of 34°C (93°F), with an average of 22°C (72°F) and only about 3 mm of precipitation over just one day. In contrast, May features cooler temperatures, with a range of 12°C (53°F) to 26°C (79°F) and an average of 17°C (63°F), along with substantially higher precipitation of 14 mm over four days. Humidity levels in both months are relatively similar, with September at 68% and May at 70%, indicating a comfortable but slightly more humid atmosphere in May. For more details on May weather specifically, you can check out this link: Oceanside weather in May.

In comparing the weather of September and June, we note some interesting differences. September experiences slightly higher temperatures, with average highs reaching up to 34°C (93°F) compared to June's maximum of 29°C (85°F). Both months have similar precipitation levels, with about 3 mm (0.1 in), but September sees rain on one day while June is dry with no recorded rainfall. Additionally, humidity remains relatively high in both months, slightly lower in June at 72% compared to September's 68%. For more detailed information, you can check Oceanside weather in June.

In comparing the weather of September and July, both months exhibit warm temperatures with some notable differences. September presents a minimum temperature of 15°C (60°F) and a maximum of 34°C (93°F), with an average of 22°C (72°F) and a slightly lower humidity of 68%. In contrast, July begins a bit warmer with a minimum of 17°C (62°F) and a maximum of 35°C (94°F), averaging around 21°C (71°F), but features a higher humidity level at 73%. Additionally, both months receive minimal precipitation, though July boasts a perfect dry spell with no rainy days, as detailed in Oceanside weather in July.

In comparing the weather between September and August, September showcases a wider temperature range with a minimum of 15°C (60°F) and a maximum of 34°C (93°F), while August has a slightly milder minimum of 17°C (64°F) and a maximum of 30°C (86°F). Both months feature the same average temperature of 22°C (72°F). Interestingly, September has very low precipitation at just 3 mm (0.1 in) over 1 day, whereas August experienced virtually no rainfall at 1 mm (0.0 in) over 0 days, leading to a similarly comfortable humidity level of around 68-69%. For a more in-depth look at August weather specifics, check out Oceanside weather in August.

September generally sees warmer temperatures with a minimum of 15°C (60°F) and an average of 22°C (72°F), peaking at 34°C (93°F), while October starts to cool down slightly, with a minimum of 11°C (52°F) and an average of 20°C (69°F). However, October can surprise with warmer highs reaching up to 36°C (97°F). Precipitation increases during October, totaling 10 mm (0.4 in) over just one day, compared to September's much drier conditions with only 3 mm (0.1 in). Humidity levels remain relatively steady, with September at 68% and October slightly lower at 67%. For more details, check out Oceanside weather in October.

In September, the weather is typically warmer with temperatures ranging from a minimum of 15°C (60°F) to a maximum of 34°C (93°F), while the average temperature hovers around 22°C (72°F). Precipitation is minimal, with only 3 mm (0.1 in) recorded over just one day. In contrast, November brings cooler temperatures, with a minimum of 10°C (49°F), an average of 18°C (64°F), and a maximum of 29°C (84°F). Rainfall increases in November to 21 mm (0.8 in) over two days, although humidity remains consistent at 68%. For more detailed information on November weather, check out Oceanside weather in November.

In September, the weather is typically warm and dry, with average temperatures around 22°C (72°F), peaking at a high of 34°C (93°F). With only 3 mm of precipitation over approximately one day, the humidity remains moderately high at 68%. In contrast, December brings cooler temperatures with an average of 15°C (59°F) and a maximum of 26°C (78°F). The month is notably wetter, with 63 mm of rainfall across five days, and humidity rises slightly to 71%. For more detailed insights, you can check the Oceanside weather in December.

Compare Oceanside's Climate with Cities Worldwide

Conclusion: What to Expect From September Weather in Oceanside

September in Oceanside offers a delightful transition into autumn, characterized by warm days accented by gentle breezes. With a maximum temperature soaring at 34°C, the days remain pleasantly warm, yet the average settles into a comfortable 22°C, making it ideal for outdoor activities. Unlike the summer months, September experiences significantly low precipitation, with rain falling only once throughout the month. The humidity, while still present, is moderate, adding a touch of comfort to the overall climate. This unique combination of warmth and limited rainfall sets September apart, making it a wonderful time to enjoy the beautiful coastal scenery. For more insights into the delightful weather patterns of Oceanside, visit Oceanside Climate.