April Weather in San Luis Obispo, United States

Last updated: February 24, 2025

April in San Luis Obispo brings a pleasant mix of weather, making it a delightful time to experience this charming city. With maximum temperatures reaching 26°C (80°F) and an average of 14°C (57°F), the days are comfortably warm, inviting outdoor activities and exploration. Cooler minimums of 7°C (44°F) remind residents and visitors to grab a light jacket for the evenings. Although April sees a modest precipitation amount of 23 mm (0.9 in) over approximately 3 days, the overall humidity level at 76% adds a refreshing quality to the air. Whether you're wandering through local parks or enjoying the vibrant downtown scene, April’s weather offers an enjoyable backdrop for all activities.

April Temperature in San Luis Obispo

In April, San Luis Obispo begins to shake off the cooler months, with temperatures steadily climbing towards the warmth of spring. The month's minimum temperature of 7°C (44°F) and an average of 14°C (57°F) herald a delightful shift, while highs reach a pleasant 26°C (80°F). This gradual increase in warmth follows March's more temperate range, where the maximum barely grazed the mid-70s. As the region transitions deeper into spring, enjoy the mild days that beckon outdoor activities, making April an inviting time to explore the natural beauty of this charming California city.

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

The chart illustrates April 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.

April Precipitation in San Luis Obispo

In April, San Luis Obispo experiences a notable decline in precipitation, receiving only 23 mm (0.9 in) of rain over just 3 days, marking a stark contrast to the wetter winter months. This drop follows the cumulative rainfall pattern observed from January through March, where the region recorded 110 mm (4.3 in) in January and steadily decreased to 84 mm (3.3 in) in March. As spring unfolds, the rains wane significantly, paving the way for drier weather in May and an almost rainless summer. This trend highlights San Luis Obispo's transition from the wetter, cooler months to the dry, sunny season, making April a crucial turning point in the region's climatic rhythm.

April Precipitation Trends in San Luis Obispo

The chart displays monthly precipitation patterns in San Luis Obispo, with values for each month alongside April's data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how April's conditions compare to those of other months.
JanFebMarAprMayJunJulAugSepOctNovDec110808423121111113276
Data source: Precipitation data for April generated using information from the Copernicus Climate Change Service.
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April Humidity in San Luis Obispo

In April, humidity levels in San Luis Obispo begin to reflect a gradual shift towards drier conditions, with an average of 76%. This marks a notable decline from the 83% observed in February, suggesting a transition into the milder climate of spring. As the year progresses into May and June, the trend continues downward, reaching 75% and 74%, respectively. This steady decrease is consistent with the region's climatological pattern, where humidity levels typically start high in the winter months before tapering off as the warmer, drier summer approaches. The trend indicates a comfortable coastal climate in April, making it an inviting time to enjoy the outdoors as the atmosphere becomes more pleasant.

April Average Humidity in San Luis Obispo

This chart illustrates the average monthly humidity levels in San Luis Obispo, with April's data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, allowing you to see how April's humidity levels compare to other months.
JanFebMarAprMayJunJulAugSepOctNovDec80%83%80%76%75%74%75%72%70%70%74%77%
Data source: Humidity data for April generated using information from the Copernicus Climate Change Service.

April UV Index in San Luis Obispo

April in San Luis Obispo ushers in a noticeable increase in sun intensity, boasting a UV Index of 9, categorized as very high. This rise reflects a broader trend observed as the months progress from winter to spring; the expansion of sunshine leads to a significant dip in burn time, now just 15 minutes for unprotected skin. As we transition into May, the UV Index peaks at 10, suggesting that outdoor enthusiasts should remain vigilant about sun safety. This pattern of increasing UV exposure highlights the importance of preparing for the sun’s intensity as the seasons change. For those planning outdoor activities, understanding these trends is crucial: stay informed and take precautions to enjoy the beautiful weather safely. For more information, visit San Luis Obispo UV Index.

Maximum UV Index Levels in San Luis Obispo for April

The chart shows the monthly maximum UV Index (UVI) for San Luis Obispo in April, 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 April 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.

April Sunshine in San Luis Obispo

April in San Luis Obispo marks a delightful transition into spring, boasting 316 hours of sunshine that invite both locals and visitors to bask in its warmth. This vibrant increase from 284 hours in March indicates a trend of rising daylight that continues into May, where the sun graces the city with an impressive 368 hours. The sunshine during April not only enhances the natural beauty of the region but establishes it as a perfect time for outdoor activities and exploration. As summer approaches, the hours continue to climb, reaching a peak in July with 383 hours, demonstrating how this coastal gem embraces the sun's brilliance through the seasons.

Monthly Sunshine Duration in San Luis Obispo: April Highlighted

The April sunshine duration represents the total number of hours San Luis Obispo experiences direct sunlight during the month of April, excluding cloudy or obstructed periods. This chart compares the sunshine duration of April with the other months of the year.
JanFebMarAprMayJunJulAugSepOctNovDec179h229h284h316h368h372h383h358h316h295h246h223h
Data source: San Luis Obispo April Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in San Luis Obispo During April

In San Luis Obispo, the likelihood of sunny weather in April stands at 57%, showcasing a slight dip compared to the preceding months of February (69%) and March (61%). This trend indicates that while spring is well underway, April experiences somewhat more cloud cover than earlier in the season. The upward trajectory in sunny days resumes in May (72%) and continues to climb through summer. Despite April's modest peak in sunshine, it's still a great time to enjoy the fresh bloom of spring, hinting at the vibrant weather just around the corner as the days gradually grow longer and sunnier.

Percentage of Sunny Days in April in San Luis Obispo

The chart illustrates the percentage of sunny days in San Luis Obispo throughout the year, with April 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 April chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in San Luis Obispo in April

In April, San Luis Obispo enjoys a significant increase in daylight, reaching an average of 13 hours. This marks a noticeable rise from 11 hours in March, as spring settles in and the days grow longer. The trend continues into May, when the daylight peaks at 14 hours, creating the perfect backdrop for outdoor activities and exploration. As the year progresses towards the summer months, daylight remains consistent at 14 hours until August, before gradually tapering off again. This pattern highlights a clear seasonal shift, with longer, sunnier days encouraging residents and visitors alike to bask in the beauty of the region's landscapes during the pleasant spring and summer months.

Average Daylight Hours in San Luis Obispo for April

The chart illustrates the variation in daylight duration in San Luis Obispo throughout the year, with April 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.

April Winds in San Luis Obispo

In April, San Luis Obispo experiences a gentle breeze with an average wind speed of 3.3 m/s (7 mph), maintaining the same refreshing pace seen in February and May. This period marks a slight decrease from the windier months of January and March, where speeds were slightly higher. As the spring unfolds, the consistent winds create a pleasant atmosphere, perfect for outdoor activities. Notably, the month transitions smoothly into the summer, where the winds typically mellow, setting the stage for the calm and serene days that characterize the warmer months ahead. Overall, April’s winds reflect a harmonious balance, transitioning seamlessly from the briskness of early spring towards the softer breezes of late spring.

Average April Wind Speed in San Luis Obispo

The chart displays monthly wind speed patterns in San Luis Obispo, with values for each month shown alongside April's data, which is highlighted for easy comparison. It illustrates the average wind speed, offering insights into how April's wind conditions compare to the rest of the year.
JanFebMarAprMayJunJulAugSepOctNovDec3.53.33.03.3 m/s3.32.82.22.12.12.92.93.1
Data source: San Luis Obispo April wind data, generated using information from the Copernicus Climate Change Service.

How April 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 April'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.

April generally brings milder temperatures compared to January, with average highs reaching up to 26°C (80°F) and lows around 7°C (44°F), while January's temperatures peak at 23°C (74°F) with a slightly lower minimum of 4°C (40°F). Additionally, April experiences significantly less rainfall, with only 23 mm (0.9 in) over three days, contrasted to January's much wetter climate, which sees 110 mm (4.3 in) over six days. Humidity levels are comparable, hovering around 76% in April and 80% in January, indicating a similarly damp feel during both months. For more detailed insights, you can check out San Luis Obispo weather in January.

When comparing the weather in April and February, April tends to be slightly warmer, with average temperatures reaching 14°C (57°F) compared to February's 12°C (54°F). The minimum temperatures in April are also higher, starting at 7°C (44°F) versus February's 4°C (39°F). However, February experiences significantly more rainfall, with a total of 80 mm (3.2 in) over six days, compared to April's 23 mm (0.9 in) over just three days. Additionally, February has a higher humidity level at 83%, relative to April's 76% humidity. For a more detailed look at February weather patterns, you can check San Luis Obispo weather in February.

Comparing the weather of April and March reveals some interesting contrasts. In April, temperatures range from a minimum of 7°C (44°F) to a maximum of 26°C (80°F), with an average temperature of 14°C (57°F), while March exhibits slightly cooler conditions with a minimum of 5°C (41°F) and a maximum of 24°C (76°F), averaging 13°C (55°F). Precipitation also differs significantly, with April receiving only 23 mm (0.9 in) of rain over 3 days, whereas March is much wetter, with 84 mm (3.3 in) over 9 days. Humidity remains fairly high in both months, with April at 76% and March slightly higher at 80%. For a more detailed look at March weather patterns, you can refer to San Luis Obispo weather in March.

April typically enjoys a slightly wider temperature range compared to May, with minimums dipping to 7°C (44°F) and maximums reaching 26°C (80°F). The month experiences an average temperature of 14°C (57°F) and sees more rainfall, totaling 23 mm (0.9 in) over 3 days. In contrast, May brings a milder climate with temperatures ranging from a minimum of 8°C (47°F) to a maximum of 25°C (77°F), averaging 15°C (59°F). Precipitation decreases significantly, with only 12 mm (0.5 in) falling over just 2 days, resulting in slightly lower humidity at 75%. For more details on May's climate, you can check San Luis Obispo weather in May.

In comparing the weather between April and June, April is generally cooler, with average temperatures ranging from a minimum of 7°C (44°F) to a maximum of 26°C (80°F), while June offers warmer conditions with temperatures ranging from a minimum of 11°C (51°F) to a maximum of 31°C (88°F). April sees more precipitation, averaging 23 mm (0.9 in) over three days, while June is notably drier, with only 1 mm of precipitation and no rainy days. Humidity levels are similar, with April at 76% and June slightly lower at 74%. For more detailed insights, you can check San Luis Obispo weather in June.

In comparing the weather of April and July, it's evident that July tends to be warmer and drier. In April, temperatures range from a minimum of 7°C (44°F) to a maximum of 26°C (80°F), with an average of 14°C (57°F) and about 23 mm of precipitation over three rainy days, resulting in a humidity level of 76%. In contrast, July features a milder temperature range, with minimums of 12°C (55°F) and maximums reaching up to 31°C (89°F), averaging around 18°C (64°F) while enjoying significantly less precipitation, approximately 1 mm, and no rainy days—all while maintaining a similar humidity of 75%. For more specifics about July weather, you can visit San Luis Obispo weather in July.

April and August present contrasting weather conditions in terms of temperature and precipitation. In April, temperatures range from a minimum of 7°C (44°F) to a maximum of 26°C (80°F), with an average of 14°C (57°F). The month also sees a relatively high humidity level of 76% and some precipitation, measuring 23 mm (0.9 in) over three days. In contrast, August offers warmer temperatures, with a minimum of 13°C (55°F), an average of 18°C (65°F), and a maximum of 31°C (88°F). This month is characterized by significantly lower precipitation, with only 1 mm recorded over zero rainy days, and a slightly lower humidity level of 72%. For more detailed information, you can check San Luis Obispo weather in August.

April and September showcase distinct differences in weather patterns. In April, temperatures range from a cool minimum of 7°C (44°F) to a comfortable average of 14°C (57°F), peaking at a warm maximum of 26°C (80°F). The month sees an average precipitation of 23 mm (0.9 in) over three days, with a humidity level hovering at 76%. In contrast, September features milder temperatures, with a minimum of 11°C (53°F) and an average of 18°C (65°F), reaching a high of 35°C (95°F). Notably, September experiences significantly less precipitation, registering only 1 mm (0.0 in) with no rainy days, and a slightly lower humidity of 70%. For more details, you can check out the San Luis Obispo weather in September.

April weather showcases a moderate climate with temperatures ranging from a minimum of 7°C (44°F) to a maximum of 26°C (80°F), averaging around 14°C (57°F). The month tends to be relatively humid at 76%, with some precipitation occurring on about 3 days, totaling 23 mm (0.9 in). In contrast, October experiences slightly warmer conditions, with a minimum temperature of 9°C (49°F) and a maximum reaching up to 33°C (92°F), averaging 17°C (64°F). October is drier, featuring only 10 mm (0.4 in) of rainfall over no days, and a lower humidity level of 70%. For more details, you can check out San Luis Obispo weather in October.

April and November share similar temperature ranges, with both months experiencing maximum temperatures around 26°C (79°F). However, April typically starts off warmer, with an average temperature of 14°C (57°F) compared to November's average of 15°C (59°F). Interestingly, November sees slightly more precipitation at 32 mm (1.2 in) compared to April's 23 mm (0.9 in), although both months have about three days of rain. Humidity levels are also comparable, hovering around 76% in April and 74% in November. For more detailed information, you can check out San Luis Obispo weather in November.

April and December exhibit distinct weather characteristics. In April, temperatures range from a minimum of 7°C (44°F) to a maximum of 26°C (80°F), with an average of 14°C (57°F). The month sees relatively low precipitation at 23 mm (0.9 in) over just 3 days, maintaining a steady humidity level of 76%. In contrast, December experiences slightly cooler temperatures, with a minimum of 5°C (42°F) and a maximum of 23°C (74°F), averaging 12°C (54°F). However, it is considerably wetter, receiving 76 mm (3.0 in) of rainfall over 6 days, while humidity remains consistent at 76%. For more details on December weather, you can check this link: San Luis Obispo weather in December.

Compare San Luis Obispo's Climate with Cities Worldwide

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

April in San Luis Obispo welcomes the arrival of spring with mild temperatures that invite residents and visitors alike to enjoy outdoor activities. Unlike the chilly months of winter, this month offers a welcoming warmth, characterized by an average temperature of 14°C (57°F), pleasant enough to encourage exploration of the area's stunning landscapes. With only a few days of rainfall and moderate humidity, the weather is generally favorable, creating a perfect backdrop for enjoying the beauty of nature. As spring unfolds, April stands out as a delightful transition into the warmer months ahead. For a deeper dive into what to expect throughout the year, visit San Luis Obispo Climate.