May Weather in San Luis Obispo, United States

Last updated: February 24, 2025

In May, San Luis Obispo experiences mild and pleasant weather, making it an ideal time to explore the area's natural beauty. Maximum temperatures reach a comfortable 25°C (77°F), while the average temperature settles around 15°C (59°F), ensuring enjoyable days and cool evenings. Nighttime lows can drop to 8°C (47°F), allowing for refreshing nighttime outings. The month sees an average precipitation of only 12 mm (0.5 in), typically spread over just two days, contributing to the region's lush greenery without interrupting outdoor activities. With humidity levels hovering around 75%, visitors can expect a crisp coastal atmosphere, perfect for hiking or enjoying local festivals.

May Temperature in San Luis Obispo

In San Luis Obispo, the month of May marks a delightful transition into warmer weather, with temperatures taking a noticeable upward swing. Minimums rise to 8°C (47°F), providing a comfortable start to the day, while the average temperature reaches a pleasant 15°C (59°F). As the sun climbs higher, daytime maximums hover around 25°C (77°F), making it an ideal time for outdoor adventures. This pattern of gradual warming builds on the previous months, with May offering a refreshing midpoint before the heat of summer settles in. The temperate climate combined with vibrant spring scenery makes San Luis Obispo particularly inviting during this time of year.

May Weather in San Luis Obispo: Daily Temperature Highs, Lows, and Averages

The chart illustrates May temperature patterns in San Luis Obispo, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec545455575862646565635954
Data source: Temperature data for San Luis Obispo 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 San Luis Obispo

In May, San Luis Obispo experiences a notable decline in precipitation, totaling just 12 mm (0.5 in) over two days of rainfall. This trend marks a significant drop from the previous months, as January recorded a substantial 110 mm and April saw 23 mm. As the region transitions into summer, the scant amount of rain in May anticipates the dry months ahead, with June and beyond typically yielding minimal precipitation. This shift not only highlights the area's seasonal variations but also sets the stage for the arid conditions that dominate during the summer and early fall.

May Precipitation Trends in San Luis Obispo

The chart displays monthly precipitation patterns in San Luis Obispo, 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.
JanFebMarAprMayJunJulAugSepOctNovDec110808423121111113276
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in San Luis Obispo

In May, San Luis Obispo experiences a slight dip in humidity, averaging around 75%. This marks a continuation of a gradual decline from the high 83% recorded in February. As spring progresses into summer, the humidity tends to decrease further, with June trailing closely at 74%. This trend indicates a transition towards drier conditions, setting the stage for the warm summer months ahead, where humidity levels typically hover between 72% and 75%. Overall, May serves as a turning point, gently easing residents and visitors into the drier climate that characterizes the upcoming summer season.

May Average Humidity in San Luis Obispo

This chart illustrates the average monthly humidity levels in San Luis Obispo, 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.
JanFebMarAprMayJunJulAugSepOctNovDec80%83%80%76%75%74%75%72%70%70%74%77%
Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in San Luis Obispo

As May arrives in San Luis Obispo, the UV Index reaches an intense 10, indicating a very high risk of harm from unprotected sun exposure. This notable increase from the previous months reflects a clear trend of rising UV intensity as spring progresses toward summer. With a burn time of just 15 minutes, it's crucial for residents and visitors alike to take protective measures, such as wearing sunscreen, hats, and sunglasses. As temperatures rise into the summer months, the UV Index is set to peak further, emphasizing the need for sun safety. For more detailed UV information, visit San Luis Obispo UV Index.

Maximum UV Index Levels in San Luis Obispo for May

The chart shows the monthly maximum UV Index (UVI) for San Luis Obispo 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.
JanFebMarAprMayJunJulAugSepOctNovDec4589101212119753
Data source: San Luis Obispo 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 San Luis Obispo

As May rolls in, San Luis Obispo basks in the warm embrace of 368 hours of sunshine, marking a delightful peak in its radiant yearly progression. After steadily increasing from 179 hours in January, the sunlit days become more abundant, culminating in May's brilliant display, just shy of June's 372 hours. This upward trend continues through the summer, with July boasting the most sun. Interestingly, while the autumn months see a gradual decline, the consistent sunshine from early spring through to mid-summer paints a lively picture of San Luis Obispo's climate, inviting both locals and visitors to savor the outdoors and indulge in the beauty of its sun-drenched landscape.

Monthly Sunshine Duration in San Luis Obispo: May Highlighted

The May sunshine duration represents the total number of hours San Luis Obispo 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.
JanFebMarAprMayJunJulAugSepOctNovDec179h229h284h316h368h372h383h358h316h295h246h223h
Data source: San Luis Obispo May Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in San Luis Obispo During May

As May approaches in San Luis Obispo, the promise of sunny weather shines brighter, boasting a 72% chance of sun that marks an increase over the preceding months. This upward trend continues into June, where the likelihood rises slightly to 73%, suggesting that the region is transitioning into its sun-drenched summer season. Compared to earlier months like February (69%) and March (61%), May stands out as a delightful time for outdoor enthusiasts and sun-seekers alike. With spring in full swing, May captures the essence of California's natural beauty, making it an ideal month for enjoying the sunshine and vibrant landscapes.

Percentage of Sunny Days in May in San Luis Obispo

The chart illustrates the percentage of sunny days in San Luis Obispo 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 San Luis Obispo experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec53%69%61%57%72%73%64%71%68%68%68%50%
Data source: San Luis Obispo May chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in San Luis Obispo in May

As spring unfolds in San Luis Obispo, the gradual increase in daylight becomes particularly noticeable in May, when residents enjoy 14 hours of sunshine. This surge is a delightful continuation of the upward trend that begins in March, where daylight extends to 11 hours, and peaks in the summer months. The gradual lengthening of days from 10 hours in January and February to the vibrant 14 hours from May to July fosters an inviting atmosphere for outdoor activities and exploration. Following this peak, daylight begins to taper off as summer transitions into fall, with 13 hours in August and 12 hours in September, reminding residents to make the most of the longer days. As the year progresses, the rhythm of daylight shifts, creating a dynamic seasonal experience that characterizes San Luis Obispo's climate.

Average Daylight Hours in San Luis Obispo for May

The chart illustrates the variation in daylight duration in San Luis Obispo throughout the year, with May highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec10h 4m10h 55m11h 59m13h 6m14h 1m14h 28m14h 13m13h 24m12h 20m11h 14m10h 17m9h 48m
Data source: San Luis Obispo daylight hours, calculated by summing the hours between sunrise and sunset for each day.

May Winds in San Luis Obispo

In May, San Luis Obispo experiences a gentle breeze with an average wind speed of 3.3 m/s (7 mph), maintaining the same calm conditions seen in April. As the spring transitions into summer, the winds show a slight consistency, resembling the relatively mild patterns of the preceding months. This trend of gentle winds continues until mid-summer, where a gradual decline begins, reaching its lowest point by August. Notably, while May's winds are perfect for outdoor activities and enjoying the scenic beauty of the area, they also hint at a forthcoming lull as temperatures rise and the landscape shifts into sun-soaked summer days. Overall, May stands as a pleasant interlude before the seasonal winds soften further, making it an ideal time for residents and visitors alike to embrace the fresh air.

Average May Wind Speed in San Luis Obispo

The chart displays monthly wind speed patterns in San Luis Obispo, 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.
JanFebMarAprMayJunJulAugSepOctNovDec3.53.33.03.33.3 m/s2.82.22.12.12.92.93.1
Data source: San Luis Obispo May wind data, generated using information from the Copernicus Climate Change Service.

How May Weather in San Luis Obispo Compares to Other Months

The weather in San Luis Obispo 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 San Luis Obispo and find detailed weather information for every month.

In comparing May and January weather, May presents a generally milder climate with average temperatures ranging from 8°C (47°F) to 25°C (77°F), accompanied by low precipitation of only 12 mm (0.5 in) over 2 days. In contrast, January features cooler temperatures, with a minimum of 4°C (40°F) and an average of 12°C (54°F), as well as significantly higher precipitation at 110 mm (4.3 in) across 6 days. The humidity is only slightly higher in January at 80%, compared to May's 75%, making both months feel relatively comfortable but inviting different outdoor experiences. For more detailed weather insights, check out San Luis Obispo weather in January.

In comparing the weather of May and February, we observe distinct differences. May features milder conditions, with average temperatures ranging from a minimum of 8°C (47°F) to a maximum of 25°C (77°F) and only 12 mm (0.5 in) of precipitation over just two days. In contrast, February is generally cooler, with average temperatures between 4°C (39°F) and 25°C (77°F), but it experiences significantly higher precipitation, totaling 80 mm (3.2 in) over six days. Additionally, February has a slightly higher humidity level at 83% compared to May's 75%. For more detailed insights, check out San Luis Obispo weather in February.

When comparing the weather in March and May, it is clear that both months offer distinct climatic conditions. March typically features a slightly lower temperature range, with a minimum of 5°C (41°F) and an average of 13°C (55°F), compared to May, which boasts a minimum of 8°C (47°F) and an average of 15°C (59°F). While both months experience relatively mild maximum temperatures—24°C (76°F) in March and 25°C (77°F) in May—March sees significantly higher precipitation levels at 84 mm (3.3 in) over 9 days, in contrast to May's much lighter rainfall of only 12 mm (0.5 in) over just 2 days. Furthermore, humidity remains high in both months, with March averaging 80% and May at 75%. For more detailed insights, you can visit San Luis Obispo weather in March.

In comparing the weather between April and May, we see a slight increase in average temperatures, with May averaging 15°C (59°F) compared to April's 14°C (57°F). While May experiences a broader temperature range with a maximum of 25°C (77°F), April's highs reach up to 26°C (80°F). Precipitation decreases notably in May, falling to just 12 mm (0.5 in) over 2 days, while April sees 23 mm (0.9 in) over 3 days, indicating a drier trend as spring progresses. Humidity remains fairly consistent, with May at 75% and April at 76%. For a more detailed look at the weather during this time, check out San Luis Obispo weather in April.

May and June showcase a notable shift in weather patterns. In May, temperatures range from a minimum of 8°C (47°F) to a maximum of 25°C (77°F), with an average of 15°C (59°F). The month sees some precipitation, totaling 12 mm (0.5 in) over two days, accompanied by a humidity level of 75%. In contrast, June brings warmer conditions, with temperatures ranging from a minimum of 11°C (51°F) to a high of 31°C (88°F) and an average of 16°C (62°F). Notably, June experiences significantly less precipitation, with just 1 mm (0.0 in) and no rainy days, while the humidity remains relatively stable at 74%. For more detailed insights, you can check out San Luis Obispo weather in June.

May and July present distinct weather characteristics. In May, temperatures range from a minimum of 8°C (47°F) to a maximum of 25°C (77°F), with an average of 15°C (59°F). Rainfall is modest, with 12 mm (0.5 in) over two days, and humidity remains comfortable at 75%. In contrast, July sees higher temperatures, with a minimum of 12°C (55°F) and a maximum of 31°C (89°F), maintaining an average of 18°C (64°F). Notably, July is drier, with only 1 mm (0.0 in) of precipitation and no rainy days, while the humidity remains steady at 75%. This makes July a sunnier and warmer month compared to May. For more detailed information, visit San Luis Obispo weather in July.

May and August exhibit contrasting weather patterns, with May experiencing cooler temperatures and higher humidity. In May, temperatures range from a minimum of 8°C (47°F) to a maximum of 25°C (77°F), accompanied by an average temperature of 15°C (59°F) and 12 mm (0.5 in) of precipitation over 2 days. In contrast, August offers warmer conditions, with temperatures ranging from a minimum of 13°C (55°F) to a maximum of 31°C (88°F), and an average temperature of 18°C (65°F). Notably, August sees very little rainfall, with only 1 mm (0.0 in) and no precipitation days. The humidity levels are slightly lower in August at 72%, compared to May's 75%. For a more detailed look at the weather in August, visit San Luis Obispo weather in August.

May and September offer distinct weather experiences, marked by their temperature ranges and precipitation levels. In May, temperatures typically span from a cool 8°C (47°F) at night to a comfortable 25°C (77°F) during the day, while experiencing about 12 mm (0.5 in) of rainfall over two days and a humidity level of 75%. In contrast, September features warmer conditions with temperatures ranging from a mild 11°C (53°F) to a sweltering 35°C (95°F), and it enjoys a much drier climate, boasting only 1 mm (0.0 in) of precipitation over the entire month and just 70% humidity. For more details on September's climate specifics, check out San Luis Obispo weather in September.

May and October present distinct weather patterns, characterized by their respective temperature ranges and humidity levels. In May, temperatures typically fluctuate from a minimum of 8°C (47°F) to a maximum of 25°C (77°F), with an average of 15°C (59°F) and humidity at 75%. This month sees around 12 mm (0.5 in) of precipitation over about 2 days. In contrast, October offers slightly warmer conditions, with minimum temperatures of 9°C (49°F) and maximums soaring up to 33°C (92°F), averaging 17°C (64°F) and accompanied by lower humidity at 70%. Remarkably, October experiences minimal rainfall—only 10 mm (0.4 in)—with no significant precipitation days. For more details on the weather during this vibrant month, visit San Luis Obispo weather in October.

When comparing the weather in May and November, both months showcase similar average temperatures, hovering around 15°C (59°F). May typically enjoys slightly warmer maximum temperatures, peaking at 25°C (77°F), while November sees a slight increase to 26°C (79°F). Rainfall is more prominent in November, with 32 mm (1.2 in) of precipitation over approximately 3 days compared to May's lighter 12 mm (0.5 in) over just 2 days. Humidity levels remain relatively constant, with May at 75% and November at 74%. For a detailed look at the weather during this month, visit San Luis Obispo weather in November.

May and December present distinctly different weather patterns. In May, temperatures range from a minimum of 8°C (47°F) to a maximum of 25°C (77°F), with an average of 15°C (59°F). Precipitation is minimal, totaling just 12 mm (0.5 in) over about 2 days, and humidity stands at 75%. In contrast, December experiences cooler temperatures, with a minimum of 5°C (42°F) and a maximum of 23°C (74°F), leading to an average of 12°C (54°F). This month sees significantly more precipitation, amounting to 76 mm (3.0 in) over 6 days, while humidity remains slightly higher at 76%. For more details, check out San Luis Obispo weather in December.

Compare San Luis Obispo's Climate with Cities Worldwide

Conclusion: What to Expect From May Weather in San Luis Obispo

As May unfolds in San Luis Obispo, it marks a delightful transition into warmer weather compared to earlier months. With pleasant average temperatures around 15°C (59°F), residents and visitors can enjoy more outdoor activities, as the days grow longer and sunnier. Humidity levels hover at a comfortable 75%, making the warmth feel more moderate. Rainfall is minimal, with only a couple of days producing light precipitation, which is a welcome change from the wetter spring months. For those curious about what to expect in this charming coastal city, exploring the San Luis Obispo Climate page offers valuable insights into seasonal trends and conditions.