Last updated: February 24, 2025
In Eureka, United States, January delivers a unique blend of cool temperatures and abundant moisture. Average daily highs reach around 10°C (50°F), with maximums peaking at 17°C (63°F), while nighttime lows can dip to 4°C (39°F). Rainfall is frequent, totaling 211 mm (8.3 inches) over the month, spread across 15 rainy days, resulting in a high humidity level of 86%. This wet and cool climate creates a vibrant and refreshing atmosphere, characteristic of Eureka during the winter season.
In Eureka, United States, January ushers in a refreshing chill, with temperatures ranging from a brisk 4°C (39°F) at night to a mild 17°C (63°F) during the day, averaging around 10°C (50°F). This month marks a transition from the colder December, maintaining a similar temperature profile, yet hinting at upcoming warmth as February approaches, where the maximum temperature can climb to 19°C (66°F). Despite the subtle shifts, January's cooling days lead to a gradual warming trend throughout the winter months, setting the stage for the spring's arrival, where temperatures steadily increase until June's balmy heights of 23°C (74°F). Overall, this month exemplifies the gentle ebb and flow of Eureka's climate, blending cool air with the promise of warmer days ahead.
January in Eureka, United States, brings a significant precipitation total of 211 mm (8.3 in), making it the wettest month of the year. With rainfall occurring over 15 days, January sets the tone for a generally damp winter, which gradually transitions into a drier spring. The precipitation starts to decrease noticeably in April, dropping to 101 mm (4.0 in), and continues its downward trend into the summer months, where it plummets to a mere 7 mm (0.3 in) in both July and August. This pattern illustrates a clear seasonal shift, with winter and early spring characterized by heavier rainfall, while the summer months offer a stark contrast with significantly reduced precipitation. As the year progresses, the rhythms of rainfall shape both the landscape and the local climate, demonstrating Eureka’s unique weather dynamics.
In January, Eureka experiences its peak humidity at a notable 86%, setting the tone for a damp winter month. As the year progresses into February and March, humidity slightly declines to 85%, maintaining a consistently moist atmosphere. By April and May, conditions continue to improve with humidity dropping to 82% and 81%, respectively, hinting at a shift towards drier weather. The summer months bring a significant decrease, with July reaching the driest point at 70% and August further lowering it to 60%. However, as autumn approaches with September and October, humidity begins to creep back up, landing at 62% and 72%. The year closes with November and December, both returning to higher humidity levels of 87% and 86%, respectively, creating a cyclical pattern that reflects Eureka's distinct seasonal shifts. Throughout the year, the trend demonstrates a gradual transition from the humid winter months to a drier summer, before cycling back to moisture-laden conditions as the year ends.
In January, Eureka experiences a moderate UV Index of 3, indicating a burn time of approximately 30 minutes. This trend of moderate exposure continues into February, where the UV Index rises slightly to 4 with the same burn time. As spring approaches, March marks a notable jump to a high UV Index of 7, reducing burn time to just 25 minutes, emphasizing the need for increased sun protection. The UV Index escalates even further in April, reaching 8—considered very high—with a burn time of only 15 minutes. This peak in UV radiation continues into May and July, peaking at 10, highlighting a clear trend of increasing solar intensity as the year progresses. Even August and September maintain a significant UV Index, gradually decreasing to 8 by October and returning to moderate levels in November. By December, the UV Index dips to a low of 2, allowing for a generous 45-minute exposure time before burn sets in. For more insight on UV levels throughout the year, check out Eureka UV Index.
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In Eureka, January kicks off the year with 118 hours of sunshine, setting a foundation for a steady increase in daylight as the months progress. By February, the hours rise to 184, signaling the arrival of longer days. March and April bring even more brilliance, with sunlit hours swelling to 243 and 274 respectively, as spring fully awakens. This upward trend peaks in July with an impressive 394 hours of sunshine, making it the sunniest month of the year. As summer transitions to autumn, the sun begins to retreat, but still offers a commendable 355 hours in August before gradually declining to 159 hours by December. This predictable ebb and flow of sunshine showcases Eureka’s vibrant seasonal rhythm, inviting both locals and visitors to embrace the beauty of each month.
In January, Eureka experiences a modest 28% chance of sunny weather, making winter a relatively overcast season. This trend of limited sunshine continues through the end of the year, as December also shows a similar 28% likelihood. However, a noticeable shift occurs in the subsequent months, with February seeing a rise to 38%, and by March, the chances of sunny days leap to 51%. As spring approaches, the sun becomes more frequent, peaking in the late summer months, reaching a delightful 60% in August and 62% in September. This progression highlights a clear seasonal transition from the dreary winter skies to the vibrant sunny days typical of the summer months in Eureka.
In Eureka, United States, January marks the beginning of a gradual increase in daylight, offering around 9 hours of sunlight as the year unfolds. As February rolls in, the days stretch to 10 hours, setting the stage for a steady climb through the spring. By March, daylight reaches 11 hours, and April brings a delightful boost to 13 hours, as nature begins to awaken. The peak of summer shines brightly in June with a generous 15 hours of daylight, providing ample time for outdoor activities. Following July, the days gradually contract, with August offering 13 hours and September, 12 hours. As autumn approaches, daylight dwindles back to 11 hours in October, before settling into the shorter days of November and December, each with just 9 hours. This rhythmic ebb and flow of daylight not only marks the changing seasons but also highlights the vibrant cycle of life that characterizes Eureka throughout the year.
In Eureka, United States, January introduces brisk winds with an average speed of 5.0 m/s (11 mph), mirroring the gusty conditions of February. As the seasons shift into spring, there is a noticeable increase in wind intensity, peaking at 5.2 m/s (12 mph) in March. However, this energizing trend takes a downward turn as warmer months approach, with April witnessing a significant drop to 3.9 m/s (9 mph), followed by even gentler breezes through the summer. Throughout the mid-year months, wind speeds hover around 3.7 to 3.8 m/s (8-9 mph). As autumn descends, winds regain a bit of their former vigor, but not before a gradual decline is observed by September, where average speeds dip to 3.2 m/s (7 mph). The trend reflects a dynamic interplay between seasonal changes, with January standing out for its robust winds that gently taper off as the year progresses.
The weather in Eureka changes throughout the year, offering a unique experience in each season. Below is a month-by-month comparison of January'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.
January and February exhibit similar weather patterns, but with slight variations in temperature and precipitation. In January, temperatures range from a minimum of 4°C (39°F) to a maximum of 17°C (63°F), with an average of 10°C (50°F). The month experiences 211 mm (8.3 in) of precipitation over 15 days and maintains a high humidity level of 86%. In contrast, February brings slightly cooler temperatures, with a minimum of 3°C (37°F) and a maximum of 19°C (66°F), averaging 9°C (48°F). Precipitation sees a minor decrease to 200 mm (7.9 in) over 14 days, accompanied by a humidity level of 85%. For more details, you can check the Eureka weather in February.
In January, the weather features slightly warmer temperatures, with average highs reaching 17°C (63°F) and lows around 4°C (39°F). The month experiences significant rainfall, totaling 211 mm (8.3 in) over 15 days, and maintains high humidity at 86%. In contrast, March sees a marginally cooler average temperature of 9°C (49°F), with the same maximum of 17°C (63°F) but a lower minimum of 3°C (38°F). Precipitation in March is reduced to 164 mm (6.5 in), also spread over 15 days, and humidity remains slightly lower at 85%. For more detailed information on the weather during this month, check out Eureka weather in March.
In January, the weather is characterized by cooler temperatures, with a minimum of 4°C (39°F) and a maximum reaching 17°C (63°F). The month sees significant rainfall, averaging 211 mm (8.3 in) spread over 15 days, accompanied by high humidity at 86%. In contrast, April experiences slightly warmer conditions, with temperatures ranging from a minimum of 5°C (41°F) to a maximum of 18°C (65°F). Precipitation drops to 101 mm (4.0 in) over 10 days, and humidity decreases to 82%. Overall, April offers a milder climate and less rain compared to January, revealing a transition into spring. For more detailed insights, you can check out Eureka weather in April.
In January, the weather is characterized by cooler temperatures, with a minimum of 4°C (39°F) and an average of 10°C (50°F), while May shows a slight increase with a minimum of 6°C (43°F) and an average of 11°C (52°F). Both months feature similar maximum temperatures of 17°C (63°F), but January experiences significantly more precipitation at 211 mm (8.3 in) over an average of 15 days compared to May’s 60 mm (2.4 in) and only 6 rainy days. Additionally, January’s humidity levels are higher at 86%, whereas May has a slightly lower humidity of 81%. For a more detailed look at the weather in May, visit Eureka weather in May.
In January, the weather is notably cooler, with average temperatures ranging from a minimum of 4°C (39°F) to a maximum of 17°C (63°F). This month experiences significant precipitation, totaling 211 mm (8.3 in) over 15 days, and the humidity remains high at 86%, creating a damp and chilly atmosphere. In contrast, June brings more pleasant conditions, with temperatures increasing to an average of 13°C (55°F), peaking at 23°C (74°F) and a minimum of 9°C (48°F). The rainfall is significantly reduced to just 23 mm (0.9 in) over 4 days, and humidity decreases to 79%, resulting in a much drier and warmer experience. For those looking to explore more about June weather, you can find additional details here: Eureka weather in June.
In January, the weather is considerably cooler, with temperatures ranging from a minimum of 4°C (39°F) to a maximum of 17°C (63°F) and an average of 10°C (50°F). It is also quite wet, with 211 mm (8.3 in) of precipitation falling over 15 days, leading to a high humidity level of 86%. In contrast, July brings milder temperatures, with a minimum of 9°C (49°F), an average of 13°C (56°F), and a maximum of 19°C (66°F). This month is far drier, experiencing only 7 mm (0.3 in) of rain across just 1 day, and the humidity drops to a more comfortable 70%. For more detailed information, check out Eureka weather in July.
In January, the weather is quite cool, with average temperatures ranging from a minimum of 4°C (39°F) to a maximum of 17°C (63°F). This month experiences significant precipitation of 211 mm (8.3 in) over approximately 15 days, along with high humidity levels at 86%. In contrast, August brings much milder conditions, with temperatures varying from a minimum of 10°C (51°F) to a maximum of 23°C (74°F). This month stands out for its dryness, as it only sees about 7 mm (0.3 in) of rainfall and typically has no rainy days, resulting in a more comfortable humidity level of 60%. For a detailed look at the weather during this time, you can check Eureka weather in August.
In January, the weather is much cooler, with average temperatures ranging from a minimum of 4°C (39°F) to a maximum of 17°C (63°F), accompanied by high humidity levels of 86%. This month also sees considerable rainfall, averaging 211 mm (8.3 in) over 15 days. In contrast, September brings milder temperatures, with a minimum of 10°C (50°F) and peaking at 29°C (84°F), resulting in a much more pleasant outdoor experience. Precipitation drops significantly to just 27 mm (1.0 in) over only 3 days, and the humidity decreases to 62%. For more information about September weather, you can refer to Eureka weather in September.
January and October present notably different weather patterns. In January, temperatures range from a minimum of 4°C (39°F) to a maximum of 17°C (63°F), with an average of 10°C (50°F). The month is characterized by high precipitation, accumulating 211 mm (8.3 in) over approximately 15 days, and high humidity levels at 86%. In contrast, October offers milder temperatures, with lows of 8°C (46°F) and highs reaching 22°C (72°F), averaging 13°C (55°F). Precipitation is significantly lower at 53 mm (2.1 in) and occurs over only 5 days, accompanied by a drop in humidity to 72%. For more details on October weather, you can check Eureka weather in October.
When comparing the weather in January and November, both months exhibit mild temperatures but with some notable differences. January experiences slightly cooler averages, with minimum temperatures around 4°C (39°F) and a maximum of 17°C (63°F), while November tends to be a bit warmer, averaging between 4°C (40°F) and 19°C (66°F). Precipitation is significantly higher in January, totaling 211 mm (8.3 in) over approximately 15 days, compared to November’s 117 mm (4.6 in) over 10 days. Humidity levels remain similar, with January at 86% and November slightly higher at 87%. For a more detailed look at November weather, visit Eureka weather in November.
In both January and December, the weather remains quite consistent, with average temperatures hovering around 10°C (50°F) and maximums reaching up to 17°C (63°F). However, January sees a slightly higher precipitation level of 211 mm (8.3 in) over 15 days, compared to December's 161 mm (6.3 in) across 13 days. While the humidity remains steady at 86% for both months, the increased rainfall in January reflects a slightly wetter start to the year. For more detailed information on December's weather, you can check this link: Eureka weather in December.
In January, Eureka experiences a distinct shift towards cooler and wetter conditions compared to other months. With higher humidity levels and significant precipitation spread across about half the month, this period captures the essence of a typical winter season on the California coast. The temperatures tend to hover around a moderate range, which provides a refreshing change yet keeps the charm of the region intact. If you're interested in understanding more about the unique characteristics of Eureka's climate, be sure to check out Eureka Climate.