May Weather in Eureka, United States

Last updated: February 24, 2025

May in Eureka, United States, ushers in a refreshing transition from spring to summer, characterized by a maximum temperature of 17°C (63°F) and an average of 11°C (52°F). Nights can be cool, with minimum temperatures dipping to 6°C (43°F). This month is also marked by 60 mm (2.4 in) of precipitation over an average of 6 days, resulting in a delightful, lush landscape. The humidity level hovers around a notable 81%, contributing to the vibrant flora and a rich, inviting atmosphere perfect for outdoor exploration.

May Temperature in Eureka

As May unfolds in Eureka, temperatures begin to show a delightful shift towards warmth, with the minimum dipping slightly to 6°C (43°F), while the average hovers around 11°C (52°F) and peaks at a pleasant 17°C (63°F). This month marks the transition from the cooler spring months, where averages lingered closer to 10°C (50°F), to a more inviting climate as summer approaches. Compared to April, Eureka enjoys slightly warmer mornings and a consistent daytime breeze, hinting at the vibrant summer days ahead. The gradual increase in temperatures not only enhances the landscape's allure but also invites locals and visitors alike to revel in the burgeoning outdoor festivities that define the season.

May Weather in Eureka: Daily Temperature Highs, Lows, and Averages

The chart illustrates May temperature patterns in Eureka, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec504848505255565859555250
Data source: Temperature data for Eureka 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.

May Precipitation in Eureka

May in Eureka marks a significant shift in precipitation patterns, as the region experiences one of its driest months with just 60 mm (2.4 in) of rain over only 6 days. This decline in moisture follows a wetter April, which recorded 101 mm (4.0 in), highlighting a trend of decreasing rainfall as late spring progresses toward summer. The contrast is stark when compared to the heavier precipitation seen earlier in the year, particularly in January and February, with their 211 mm (8.3 in) and 200 mm (7.9 in), respectively. As the landscape shifts from lush greens to drier tones, the drop in rainfall signals a transition, laying the groundwork for the parched summer months ahead.

May Precipitation Trends in Eureka

The chart displays monthly precipitation patterns in Eureka, with values for each month alongside May's data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how May's conditions compare to those of other months.
JanFebMarAprMayJunJulAugSepOctNovDec2112001641016024772753117161
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Eureka

In May, Eureka experiences a modest decline in humidity, averaging 81%, marking a shift from the wetter months of early spring. This dip is part of a broader trend as the humidity gradually decreases from an average of 86% in January to 79% by June. As the seasons progress towards summer, residents can enjoy a slight reprieve from the moisture-laden air that characterizes the earlier months. However, the lingering humidity in May still echoes the heavier atmospheres of spring, reminding us that while summer approaches, the cool, damp essence of Eureka is not quite ready to let go.

May Average Humidity in Eureka

This chart illustrates the average monthly humidity levels in Eureka, with May's data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, allowing you to see how May's humidity levels compare to other months.
JanFebMarAprMayJunJulAugSepOctNovDec86%85%85%82%81%79%70%60%62%72%87%86%
Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in Eureka

As May arrives in Eureka, the UV Index soars to an impressive 10, marking it as a month of very high sun exposure. With a burn time of just 15 minutes, residents and visitors alike should take extra precautions to protect their skin from the intense rays. This significant increase from the earlier months indicates a clear trend: as spring shifts into summer, UV levels intensify, with April at an already high 8. Moreover, the UV Index remains elevated throughout June and July, peaking at 11 before stabilizing back to 10 in August. It's a powerful reminder of the changing seasons and the importance of sun safety. For more insights on UV levels and safety measures, visit Eureka UV Index.

Maximum UV Index Levels in Eureka for May

The chart shows the monthly maximum UV Index (UVI) for Eureka in May, 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.
JanFebMarAprMayJunJulAugSepOctNovDec3478101110108642
Data source: Eureka May 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.

May Sunshine in Eureka

May in Eureka, United States, shines brightly with an impressive 334 hours of sunshine, marking a significant leap from earlier in the year. This upward trend continues the momentum established in the previous months, showcasing a vibrant transition from spring to early summer. As the days grow longer and warmer, the steady increase from January’s mere 118 hours to May’s bounty reflects the captivating journey of sunlight that residents eagerly anticipate each year. June and July extend this sunny phenomenon even further, surpassing 370 hours, making this time of year not just a peak for daylight but a celebration of the natural beauty and energy that Eureka has to offer. The overall pattern highlights a distinct seasonal rhythm, inviting both locals and visitors to bask in the glory of the Pacific sun.

Monthly Sunshine Duration in Eureka: May Highlighted

The May sunshine duration represents the total number of hours Eureka experiences direct sunlight during the month of May, excluding cloudy or obstructed periods. This chart compares the sunshine duration of May with the other months of the year.
JanFebMarAprMayJunJulAugSepOctNovDec118h184h243h274h334h370h394h355h300h268h201h159h
Data source: Eureka May Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Eureka During May

In May, the chance of sunny weather in Eureka, United States holds steady at 49%, mirroring the slightly cloudy conditions typical of April. This stable likelihood indicates that while May doesn't usher in all-out sunshine, it remains a favorable month for enjoying the outdoors, especially as the days grow longer. Interestingly, the weather outlook leads into June, where the chance of sun dips slightly to 46%. However, as summer approaches, July presents a promising shift with a higher likelihood of sun. The trend reveals an upward trajectory in sunny days as the year progresses, emphasizing that while May is moderately sunny, the golden days of summer aren't far behind.

Percentage of Sunny Days in May in Eureka

The chart illustrates the percentage of sunny days in Eureka throughout the year, with May 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 Eureka experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec28%38%51%49%49%46%52%60%63%42%31%28%
Data source: Eureka May chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Eureka in May

As spring transitions into summer, Eureka, United States, basks in steadily increasing daylight during May, boasting 14 hours of sunlight—an uplifting surge from the 13 hours seen in April. This trend highlights a delightful progression from the shorter days of winter, where January and February offered just 9 and 10 hours respectively. Following the peak in June, when daylight reaches its zenith at 15 hours, the sun’s presence gradually wanes through the summer months, with July reverting back to 14 hours. This rhythmic pattern of daylight serves as a reminder of nature's cyclical beauty, enchanting residents and visitors alike as they savor the longer, brighter days of late spring and early summer.

Average Daylight Hours in Eureka for May

The chart illustrates the variation in daylight duration in Eureka throughout the year, with May highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec9h 36m10h 39m11h 58m13h 20m14h 28m15h 2m14h 43m13h 42m12h 24m11h 3m9h 52m9h 16m
Data source: Eureka daylight hours, calculated by summing the hours between sunrise and sunset for each day.

May Winds in Eureka

In Eureka, the month of May presents a gentle embrace of breezy days, with an average wind speed of 4.8 m/s (11 mph), maintaining a consistent vibe from the months prior. This slight dip from the windier March (5.2 m/s) reflects a transition into late spring, where calmer conditions often prevail. Notably, the prevailing winds here tend to decrease as summer approaches, with lower speeds recorded in June and beyond. Overall, May serves as a beautiful interlude, where mild winds complement the vibrant blooms, making it a perfect time for outdoor activities amidst nature's splendor.

Average May Wind Speed in Eureka

The chart displays monthly wind speed patterns in Eureka, with values for each month shown alongside May's data, which is highlighted for easy comparison. It illustrates the average wind speed, offering insights into how May's wind conditions compare to the rest of the year.
JanFebMarAprMayJunJulAugSepOctNovDec5.05.15.23.94.8 m/s3.73.83.83.24.43.74.4
Data source: Eureka May wind data, generated using information from the Copernicus Climate Change Service.

How May Weather in Eureka Compares to Other Months

The weather in Eureka changes throughout the year, offering a unique experience in each season. Below is a month-by-month comparison of May'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.

Comparing the weather in May and January reveals some interesting differences. In May, temperatures range from a minimum of 6°C (43°F) to a maximum of 17°C (63°F), with an average temperature of 11°C (52°F). The month sees approximately 60 mm (2.4 in) of precipitation over about 6 days, coupled with a humidity level of 81%. In contrast, January experiences slightly cooler temperatures, with a minimum of 4°C (39°F) and an average of 10°C (50°F). However, it can be much wetter, accumulating 211 mm (8.3 in) of precipitation over 15 days and higher humidity at 86%. For a detailed look at January weather in Eureka, check out Eureka weather in January.

When comparing the weather in May and February, several notable differences emerge. May typically enjoys milder temperatures, with an average of 11°C (52°F) and maximums reaching 17°C (63°F), while February shows a slightly lower average of 9°C (48°F) and can peak at 19°C (66°F). However, February experiences significantly more precipitation, with 200 mm (7.9 in) falling over 14 days compared to May's 60 mm (2.4 in) spread over just 6 days. Additionally, humidity levels are quite similar, with February at 85% and May slightly lower at 81%. For a more detailed breakdown of February weather patterns, refer to Eureka weather in February.

In comparing the weather between March and May, it is evident that while both months can reach a maximum temperature of 17°C (63°F), May enjoys a slightly warmer average temperature of 11°C (52°F) compared to March's average of 9°C (49°F). Additionally, May experiences significantly less precipitation, totaling 60 mm (2.4 in) over 6 days, while March sees more than double that amount at 164 mm (6.5 in) across 15 rainy days. This leads to a marginally lower humidity level in May at 81%, compared to 85% in March. For more detailed insights on March weather, you can check this link: Eureka weather in March.

In comparing the weather between April and May, we can see some distinct differences. April experiences slightly cooler average temperatures, ranging from a minimum of 5°C (41°F) to a maximum of 18°C (65°F), while May's temperatures range from 6°C (43°F) to 17°C (63°F). Notably, April receives significantly more precipitation, totaling 101 mm (4.0 in) over 10 days compared to May's 60 mm (2.4 in) over just 6 days. The humidity remains quite similar, with April at 82% and May at 81%. For further details on April's weather, you can explore Eureka weather in April.

In comparing May and June weather, June typically offers a noticeable improvement in temperatures, with minimums rising from 6°C (43°F) in May to 9°C (48°F) in June, and average temperatures reaching 13°C (55°F) compared to May's 11°C (52°F). The maximum temperature can climb significantly in June, peaking at 23°C (74°F), whereas in May, it only reaches 17°C (63°F). Additionally, June experiences less precipitation, with only 23 mm (0.9 in) over four days, in contrast to May's 60 mm (2.4 in) across six rainy days. Humidity levels remain relatively stable, showing only a slight decrease from 81% in May to 79% in June. For more details, check out Eureka weather in June.

May and July present notable contrasts in weather patterns. In May, temperatures range from a chilly minimum of 6°C (43°F) to a moderate maximum of 17°C (63°F), with an average of 11°C (52°F). This month also sees more rainfall, with about 60 mm (2.4 in) falling over six days and higher humidity at 81%. In contrast, July offers milder temperatures, with a minimum of 9°C (49°F) and a maximum of 19°C (66°F), averaging 13°C (56°F). Precipitation drops significantly to just 7 mm (0.3 in) over one day, and humidity decreases to 70%. For a more detailed look at July weather, you can check Eureka weather in July.

May and August present notably different weather conditions. In May, temperatures range from a chilly minimum of 6°C (43°F) to a pleasant maximum of 17°C (63°F), with an average of 11°C (52°F). This month also experiences considerable precipitation, with around 60 mm (2.4 in) falling over approximately 6 days, contributing to a high humidity level of 81%. In contrast, August offers much warmer temperatures, with a minimum of 10°C (51°F), an average of 14°C (58°F), and a maximum reaching 23°C (74°F). Notably, August sees minimal rainfall, with only 7 mm (0.3 in) and no rainy days, resulting in a more comfortable humidity level of 60%. For more detailed information, you can check Eureka weather in August.

May and September showcase distinct contrasts in weather patterns. While May experiences cooler temperatures ranging from a minimum of 6°C (43°F) to a maximum of 17°C (63°F), September enjoys milder conditions with temperatures that stretch from a minimum of 10°C (50°F) to a warm maximum of 29°C (84°F). Furthermore, May tends to be wetter, with an average precipitation of 60 mm (2.4 in) over about 6 days, compared to September's drier climate, which sees only 27 mm (1.0 in) of rain in approximately 3 days. Additionally, the humidity level in May is notably higher at 81%, while September offers a more comfortable average of 62%. For more details on September weather, you can visit Eureka weather in September.

May and October present distinct weather patterns, with May being characterized by cooler temperatures and higher humidity. In May, average temperatures range from a minimum of 6°C (43°F) to a maximum of 17°C (63°F), accompanied by 60 mm (2.4 inches) of rainfall over approximately 6 days and a humidity level of 81%. In contrast, October sees slightly warmer temperatures, with an average ranging from a minimum of 8°C (46°F) to a comfortable maximum of 22°C (72°F). Precipitation is a bit lower at 53 mm (2.1 inches) over 5 days, and the humidity decreases to 72%. For more detailed insights about October weather, you can visit Eureka weather in October.

In comparison to May, November typically offers a mild climate with average temperatures similar at 11°C (52°F), but November features slightly cooler minimum temperatures of 4°C (40°F). While both months experience pleasant highs, November can reach up to 19°C (66°F), slightly higher than May’s maximum of 17°C (63°F). However, November is considerably wetter, receiving 117 mm (4.6 in) of precipitation over approximately ten days, compared to May's 60 mm (2.4 in) across just six days. The humidity also increases in November, reaching 87%, compared to May's 81%. For more detailed information, check out Eureka weather in November.

In comparing the weather of May and December, both months feature similar maximum temperatures reaching up to 17°C (63°F), but their overall climate conditions differ significantly. May typically experiences a milder average temperature of 11°C (52°F) with less precipitation, totaling 60 mm (2.4 in) over about 6 days. In contrast, December is cooler, with an average temperature of 10°C (50°F), but it sees a substantial increase in rainfall—161 mm (6.3 in) over 13 days. Additionally, the humidity rises from 81% in May to 86% in December, making December feel slightly more damp and chilly. For more details about the December weather, you can check out Eureka weather in December.

Compare Eureka's Climate with Cities Worldwide

Conclusion: What to Expect From May Weather in Eureka

As May unfolds in Eureka, the temperature gradually warms up, marking a shift from the cooler spring months. With an average temperature nearing 11°C (52°F), residents and visitors can rejoice in the gentle embrace of early summer. However, this month can also bring occasional rain, contributing to a precipitation total of 60 mm (2.4 in) distributed over about six days, fostering the lush greenery that defines the area. The humidity remains noticeably high at 81%, adding a refreshing quality to the coastal air. Compared to other months, May offers a delightful blend of warmth and splashes of rain, making it an ideal time to explore the scenic beauty of Eureka. For a deeper dive into what to expect throughout the year, check out the full details at Eureka Climate.