Last updated: February 24, 2025
September in Eureka, United States offers a delightful transition into autumn, with maximum temperatures peaking at a comfortable 29°C (84°F) and an average of 15°C (59°F). While the days are still basking in warmth, the nights cool down to a refreshing 10°C (50°F), perfect for cozy evenings. Though the month sees only 3 days of rain, accumulating 27 mm (1.0 in) of precipitation, humidity hovers around 62%, creating a pleasantly crisp atmosphere. This blend of warm days and cool nights makes September an ideal time to explore the natural beauty of Eureka.
In September, Eureka experiences a delightful transition as temperatures start to warm up. With a minimum of 10°C (50°F) and an average of 15°C (59°F), the month shows a noteworthy shift from the cooler months, culminating in a maximum of 29°C (84°F). This rise in temperature marks the peak warmth for the year, offering a perfect opportunity for outdoor activities and enjoying the beautiful surrounding scenery. As autumn approaches, September stands out as a month of warmth and vibrancy, making it an ideal time to appreciate this charming coastal town.
In Eureka, September marks a mild uptick in precipitation, featuring an average of 27 mm (1.0 in) spread across just three days. This increase comes after an unusually dry summer, with both July and August recording only 7 mm each. As autumn approaches, the trend of rising precipitation continues, signaling a shift from the arid months of summer. While September remains relatively dry compared to the wetter months like January and November, this early hint of rainfall prepares the region for the more substantial downpours that typically follow in the fall. The gradual transition highlights Eureka's distinct climatic patterns, adding a refreshing touch to the onset of the season.
In September, Eureka experiences a noticeable uptick in humidity, measuring 62%—slightly elevated from the 60% recorded in August. This marks the beginning of a seasonal shift, as the summer warmth gradually yields to cooler autumn air. Notably, the drop from July's low of 70% to August's 60% reflects the region's transition towards a drier summer, while September’s increase hints at the impending return of the wet fall season. As the year progresses, humidity levels will continue to rise, reaching 72% in October and climbing further towards the winter months, when levels peak again at 87% in November. This pattern underscores the coastal climate's tendency towards higher humidity during the colder months, enveloping Eureka in a moist embrace as the seasons change.
In September, Eureka experiences a UV Index of 8, categorized as very high, indicating that sun protection is crucial during this month, with a burn time of just 15 minutes. This trend mirrors the intense summer months of July and August, which also recorded UV levels of 10, but marks a slight decrease from June's extreme index of 11. As the year transitions into fall, September’s UV readings still demand caution, reminding residents and visitors alike that UV exposure remains significant. It's a vital time to stay informed about sun safety practices, especially as we approach the cooler months ahead. For more detailed insights, explore the complete data at Eureka UV Index.
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As summer transitions to autumn, September shines brightly in Eureka, delivering a robust 300 hours of sunshine. This month marks a notable drop from the peak summer months of July and August, which basked in 394 and 355 hours respectively. However, September still benefits from the lingering warmth, representing a significant accumulation compared to the winter months, which see less than half the sunshine. This gradual decline continues into October, hinting at the cool, cozy days ahead, yet September's ample sunlight allows residents to revel in outdoor activities before the chill sets in. It’s a perfect blend of summer's warmth and autumn's promise, making it a delightful time to enjoy the natural beauty of Eureka.
As summer fades and autumn approaches, **September in Eureka, United States, showcases an encouraging 62% chance of sunny weather—the highest rate since June. This marks a promising upward trend from the previous months, with sunlight peaking notably in August. With the likelihood of sunshine steadily increasing through the summer, September offers the perfect blend of warmth and clarity, making it an ideal time for outdoor activities before the clouds of fall set in. As the year begins to cool down, revel in the golden days of early autumn, where every sunny moment is a treasured gift.
As summer fades into autumn, September in Eureka, United States, witnesses a gentle transition in daylight duration, offering 12 hours of daylight. This marks a gradual decline from the peak of 15 hours in June, reflecting the region's shift towards shorter days. Following the vibrant month of May with 14 hours, September provides a balanced light that prepares residents for the upcoming months. The trend of gradually diminishing daylight will continue into October, where it drops to 11 hours, before settling at 9 hours in the chilly depths of winter. This rhythmic fluctuation in daylight not only underscores the changing seasons but also enriches the experience of life in Eureka as it moves from the warmth of summer into the crisp embrace of fall.
As summer transitions to autumn, September in Eureka reveals a gentle shift in the winds. With an average wind speed of 3.2 m/s (7 mph), September marks the lowest point in the yearly wind pattern, reflecting a calmness that contrasts sharply with the breezier months earlier in the year. This decline is notable, especially when compared to May's moderate 4.8 m/s (11 mph) and the steady 5.0 m/s (11 mph) observed in January. As the coastal town moves into the fall months, the winds are likely to pick up again in October, reminding residents and visitors alike that while autumn brings cooler temperatures, it can also bring a brisk revival in wind speed, nudging it back toward more familiar levels. The natural ebb and flow of the seasons ensures that each month in Eureka presents its own unique charm!
The weather in Eureka 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 Eureka and find detailed weather information for every month.
September and January present notably different weather patterns. In September, temperatures range from a pleasant minimum of 10°C (50°F) to a warm maximum of 29°C (84°F), with an average of 15°C (59°F) and relatively low precipitation of 27 mm (1.0 in) occurring over just 3 days. Humidity averages around 62%, creating a comfortable atmosphere. In contrast, January brings much cooler temperatures, with a minimum of 4°C (39°F) and a maximum of 17°C (63°F), averaging at 10°C (50°F). This month experiences significantly higher precipitation, totaling 211 mm (8.3 in) over 15 days, and a notable increase in humidity at 86%. For more details, see Eureka weather in January.
September and February present contrasting weather conditions. In September, temperatures are generally milder, with a minimum of 10°C (50°F), an average of 15°C (59°F), and a maximum of 29°C (84°F). The month enjoys relatively low precipitation of 27 mm (1.0 in) over just three days, coupled with a moderate humidity of 62%. In stark contrast, February experiences cooler temperatures, with a minimum of 3°C (37°F), an average of 9°C (48°F), and a maximum of 19°C (66°F). This month is also much wetter, receiving 200 mm (7.9 in) of precipitation over 14 days and higher humidity levels at 85%. For more detailed insights about February weather, visit Eureka weather in February.
September and March showcase markedly different weather patterns. In September, temperatures range from a pleasant minimum of 10°C (50°F) to a warm maximum of 29°C (84°F), with an average of 15°C (59°F). The month sees relatively low precipitation, totaling 27 mm (1.0 in) over just 3 days, and a moderate humidity level of 62%. In contrast, March experiences cooler temperatures, with a minimum of 3°C (38°F), an average of 9°C (49°F), and a maximum of 17°C (63°F). This month is characterized by significantly higher precipitation at 164 mm (6.5 in) spread over 15 days and increased humidity at 85%. The stark differences in temperature and precipitation highlight the transition from late summer to early spring. For more details, check out Eureka weather in March.
When comparing the weather in September and April, notable differences emerge. September boasts a more comfortable temperature range, with minimums around 10°C (50°F) and maximums reaching 29°C (84°F), making it a warmer month overall. In contrast, April experiences cooler temperatures, with minimums of 5°C (41°F) and maximums capping at 18°C (65°F). Additionally, September tends to be drier, with only 27 mm (1.0 in) of precipitation over just 3 days, while April is significantly wetter, receiving 101 mm (4.0 in) across 10 days. The humidity also differs, as April has a higher average humidity of 82% compared to September's 62%. For more details, check out Eureka weather in April.
When comparing the weather in September and May, we can observe notable differences in temperature and humidity levels. September boasts a milder climate with average temperatures ranging from a low of 10°C (50°F) to a high of 29°C (84°F), making it significantly warmer than May, which has an average temperature between 6°C (43°F) and 17°C (63°F). Precipitation also differs, with September receiving less rainfall (27 mm) over a shorter duration (3 days) compared to May's 60 mm of rain spread across 6 days. Additionally, humidity levels in May are higher at 81%, compared to September's 62%, contributing to a more humid feel during the earlier month. For more specifics on weather patterns, you can check out Eureka weather in May.
When comparing the weather in September and June, notable differences can be observed. September features a wider temperature range, with minimums of 10°C and maximums reaching up to 29°C, averaging around 15°C, while June sees slightly cooler conditions, with temperatures ranging from a minimum of 9°C to a maximum of 23°C and an average of 13°C. Both months experience a similar level of precipitation, with September averaging 27 mm over 3 days and June slightly lower at 23 mm over 4 days. Additionally, September's humidity is lower at 62%, compared to June’s higher humidity level of 79%. For more detailed insights, you can check Eureka weather in June.
In comparing the weather of September and July, September generally presents a wider temperature range, with minimum temperatures averaging around 10°C (50°F) and maximums reaching up to 29°C (84°F). This contrasts with July, which has a more modest temperature spectrum, ranging from a minimum of 9°C (49°F) to a maximum of 19°C (66°F). Additionally, September experiences slightly more precipitation, totaling 27 mm (1.0 in) over three days, whereas July sees lesser rainfall of just 7 mm (0.3 in) across only one day. Notably, humidity levels are slightly higher in July at 70%, compared to September’s 62%. For more details about July weather, check Eureka weather in July.
In comparing the weather between August and September, we see a notable shift in temperatures and precipitation patterns. September experiences a wider temperature range, with minimums around 10°C (50°F) and maximums reaching up to 29°C (84°F), resulting in an average temperature of 15°C (59°F). In contrast, August maintains cooler temperatures, with a minimum of 10°C (51°F) and a maximum of 23°C (74°F), yielding an average temperature of 14°C (58°F). Additionally, September sees increased precipitation, totaling 27 mm (1.0 in) over three days, whereas August is notably drier with just 7 mm (0.3 in) and no rainy days. Both months have similar humidity levels, hovering around 60-62%. For more detailed weather information, you can visit Eureka weather in August.
As summer gives way to fall, September experiences warmer temperatures, with a minimum of 10°C (50°F) and a maximum of 29°C (84°F), whereas October sees cooler conditions, with temperatures dipping to a minimum of 8°C (46°F) and a maximum of 22°C (72°F). In September, the average temperature is a comfortable 15°C (59°F), while October’s average drops to 13°C (55°F). Moreover, October brings increased precipitation, with 53 mm (2.1 in) over 5 days compared to September's 27 mm (1.0 in) over just 3 days, and the humidity also rises from 62% in September to 72% in October. For a detailed look at the weather in October, you can visit Eureka weather in October.
September presents a milder climate with temperatures ranging from a minimum of 10°C (50°F) to a maximum of 29°C (84°F), averaging around 15°C (59°F). The month experiences relatively low precipitation, totaling 27 mm (1.0 in) across just 3 days, and maintains a humidity level of 62%. In contrast, November brings cooler temperatures with a minimum of 4°C (40°F) and a maximum of 19°C (66°F), averaging at only 11°C (52°F). This month is significantly wetter, seeing 117 mm (4.6 in) of rainfall over 10 days, and the humidity rises to 87%. For more details on November weather, visit Eureka weather in November.
September offers a mild and variable climate, with temperatures ranging from a minimum of 10°C (50°F) to a comfortable maximum of 29°C (84°F). The month experiences relatively low precipitation at 27 mm (1.0 in) over just three days, making it a pleasant time for outdoor activities with a humidity level of 62%. In contrast, December brings much cooler temperatures, with averages dropping to a minimum of 4°C (39°F) and a maximum of 17°C (63°F). Additionally, this month sees a significant increase in precipitation, totaling 161 mm (6.3 in) spread over 13 days and higher humidity at 86%. For more detailed information on the December weather, you can visit Eureka weather in December.
As summer begins to wane, September in Eureka brings a refreshing shift in weather. With pleasantly mild temperatures and a noticeable decrease in precipitation compared to the heavier rainy months, this time of year is ideal for those seeking a balance between warmth and cooler breezes. The average temperature hovers comfortably around the mid-teens, allowing for enjoyable outdoor activities without the sweltering heat of summer. Humidity levels remain moderate, creating a refreshing atmosphere that contrasts with the dampness of winter months. For those planning activities in this charming coastal city, September offers a uniquely pleasant experience. For more detailed information, check out Eureka Climate.