April Weather in San Francisco, United States

Last updated: February 24, 2025

April in San Francisco delights residents and visitors alike with its balmy temperatures, ranging from a pleasant 7°C (44°F) at night to a sunny high of 28°C (82°F) during the day. The average temperature settles around a comfortable 13°C (55°F), making it an ideal time for outdoor activities. While the city does experience some rainfall, totaling 35 mm (1.4 in) over 5 days, the humidity level hovers at a moderate 79%, adding a refreshing touch to the coastal atmosphere. Embrace the essence of spring as San Francisco comes alive with color and warmth!

April Temperature in San Francisco

April in San Francisco marks a distinct shift towards warmer weather, with temperatures taking a noticeable leap compared to the earlier months. The minimum temperature rises to a comfortable 7°C (44°F), while the average climbs to 13°C (55°F), setting the stage for delightful spring days. The most striking change comes in the maximum temperature, which can reach an impressive 28°C (82°F), inviting residents and visitors alike to embrace outdoor activities. This trend not only signals longer, sunnier days but also showcases a vibrant transition as the city casts off the chill of winter and ushers in a season of warmth and renewal.

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

The chart illustrates April temperature patterns in San Francisco, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec515253555659596162605552
Data source: Temperature data for San Francisco 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 Francisco

April marks a notable shift in San Francisco's precipitation patterns, with the city receiving just 35 mm (1.4 in) of rain over 5 days, a significant drop from the previous months. After experiencing a wetter start to the year, where January and February both exceeded 100 mm, March's rainfall also decreased to 78 mm. This declining trend continues into May, where precipitation further reduces to 20 mm (0.8 in), hinting at the onset of the dry season. As the spring unfolds, San Francisco embraces milder, drier days, transitioning from the rain-soaked months of winter to the clearer, sunnier skies of summer.

April Precipitation Trends in San Francisco

The chart displays monthly precipitation patterns in San Francisco, 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.
JanFebMarAprMayJunJulAugSepOctNovDec1061097835203322305095
Data source: Precipitation data for April generated using information from the Copernicus Climate Change Service.
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April Humidity in San Francisco

As spring unfolds in San Francisco, April brings a refreshing dip in humidity, averaging around 79%, which is slightly lower than the preceding months. This decrease marks the start of a trend where humidity levels will fluctuate more noticeably, dipping in late spring before rising again into the summer. Following the relatively high levels experienced in January through March, April’s milder humidity offers a brief respite, paving the way for the warmer and slightly more humid days of May. With an overall pattern showing a gentle decline through April before a gradual increase in the summer months, San Francisco's climate creates a delightful balance for both residents and visitors alike.

April Average Humidity in San Francisco

This chart illustrates the average monthly humidity levels in San Francisco, 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.
JanFebMarAprMayJunJulAugSepOctNovDec85%82%82%79%83%84%87%87%86%80%79%79%
Data source: Humidity data for April generated using information from the Copernicus Climate Change Service.

April UV Index in San Francisco

As April rolls into San Francisco, the UV Index surges to 9, signaling a very high level of sun exposure. This heightened UV radiation means that residents and visitors should take special care, as the burn time is reduced to just 15 minutes. Comparing this to the preceding months, it's clear that spring brings not only blooming flowers but also an increasing intensity of sunlight. March introduces a dramatic leap from 8 to April's 9, continuing the trend of rising UV levels that will peak in May. As we transition toward summer, understanding the patterns of the UV Index can help everyone stay protected under the California sun. For more insights on sun safety, check out San Francisco UV Index.

Maximum UV Index Levels in San Francisco for April

The chart shows the monthly maximum UV Index (UVI) for San Francisco 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.
JanFebMarAprMayJunJulAugSepOctNovDec3589101111109743
Data source: San Francisco 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 Francisco

April shines brightly in San Francisco, boasting 296 hours of glorious sunshine—a significant increase from 263 hours in March. As the city emerges from the cooler winter months, this upward trend continues, leading into the sun-drenched days of May, which enjoys 341 hours of light. Each month, from January's modest 151 hours to June's peak of 355 hours, reflects a gradual yet unmistakable rise in sunshine hours. This progression not only heralds the arrival of spring but also sets the stage for the vibrant summer that follows, embodying the city's unique charm and inviting residents and visitors alike to revel in the warmth of the California sun.

Monthly Sunshine Duration in San Francisco: April Highlighted

The April sunshine duration represents the total number of hours San Francisco 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.
JanFebMarAprMayJunJulAugSepOctNovDec151h216h263h296h341h355h349h320h299h276h225h194h
Data source: San Francisco April Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in San Francisco During April

April in San Francisco presents a mixed bag when it comes to sunny weather, with a 56% chance of clear skies. This figure mirrors February's sunny disposition but dips from the peak of 62% experienced in March. As spring settles in, the likelihood of basking in sunshine remains relatively stable, suggesting that while the city may not boast the sunniest April, it still holds promise for those seeking warmth. Notably, the trend seems to climb into May, where the chance of sunshine rises to 66%, hinting at a brightening outlook as the season progresses. Overall, while April may not be the sunniest month, it certainly sets the stage for more cheerful weather as summer approaches.

Percentage of Sunny Days in April in San Francisco

The chart illustrates the percentage of sunny days in San Francisco 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 Francisco experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec39%56%62%56%66%51%37%47%51%51%42%33%
Data source: San Francisco April chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in San Francisco in April

As spring unfolds in San Francisco, April marks a delightful transition with an average of 13 hours of daylight, reflecting a significant increase from the 11 hours seen in March. This upward trend continues from previous months, showcasing how longer days invigorate the city, inviting residents and visitors alike to bask in the rejuvenating sunlight. Following April, May offers even more daylight, peaking at 14 hours, before gradually tapering into the summer months of June and July. The patterns of daylight reveal a yearly rhythm, where the increasing hours from winter to spring create a vibrant atmosphere, making April a truly special time in the City by the Bay.

Average Daylight Hours in San Francisco for April

The chart illustrates the variation in daylight duration in San Francisco throughout the year, with April highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec9h 53m10h 48m11h 59m13h 11m14h 12m14h 42m14h 26m13h 31m12h 22m11h 9m10h 7m9h 35m
Data source: San Francisco daylight hours, calculated by summing the hours between sunrise and sunset for each day.

April Winds in San Francisco

In April, San Francisco experiences a noticeable uptick in average wind speed, reaching 4.6 m/s (10 mph), the highest for the spring months. This gentle breeze signals the city's transition towards the warmer season, as it paves the way for May's peak wind speed of 5.4 m/s (12 mph). Compared to the preceding months, April's winds feel invigorating, enhancing the city's vibrant atmosphere. Following this spring peak, the wind speeds reveal a slight decline as summer approaches, showcasing San Francisco's unique climatological rhythm. This blend of refreshing breezes and notable shifts not only defines the city's weather pattern but also enriches its coastal charm.

Average April Wind Speed in San Francisco

The chart displays monthly wind speed patterns in San Francisco, 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.
JanFebMarAprMayJunJulAugSepOctNovDec3.24.04.14.6 m/s5.44.74.03.73.33.72.73.9
Data source: San Francisco April wind data, generated using information from the Copernicus Climate Change Service.

How April Weather in San Francisco Compares to Other Months

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

April brings milder temperatures to San Francisco, with an average of 13°C (55°F) and maximums reaching 28°C (82°F), while January tends to be cooler, averaging 11°C (52°F) and peaking at 21°C (70°F). In terms of precipitation, April is drier with 35 mm (1.4 in) over 5 days, compared to January's wetter conditions, which see 106 mm (4.2 in) over 9 days. Additionally, while both months exhibit relatively high humidity, January's 85% slightly surpasses April's 79%. For more detailed insights, check out San Francisco weather in January.

April weather generally presents warmer temperatures compared to February, with average highs reaching up to 28°C (82°F) versus February's maximum of 20°C (69°F). While April enjoys a milder average rainfall of 35 mm (1.4 in) over 5 days, February experiences considerably higher precipitation at 109 mm (4.3 in) over 9 days. Both months have similar humidity levels, with April at 79% and February slightly higher at 82%. For a detailed look at February's climate, check out San Francisco weather in February.

In comparing the weather of April and March, April generally offers a warmer experience, with average temperatures rising from 12°C (53°F) in March to 13°C (55°F) in April. The maximum temperature in April reaches up to 28°C (82°F), significantly higher than March's peak of 20°C (69°F). However, March presents more rainfall, with a total precipitation of 78 mm (3.1 in) over 10 days, compared to April's 35 mm (1.4 in) across just 5 days. Humidity remains relatively similar, with March at 82% and April slightly lower at 79%. For a detailed look at the conditions during March, you can visit San Francisco weather in March.

April and May exhibit notable differences in weather patterns. April experiences a wider range of temperatures, with a minimum of 7°C (44°F) and a maximum soaring up to 28°C (82°F), culminating in an average temperature of 13°C (55°F). In contrast, May has a more moderate temperature range, with minimum temperatures of 8°C (47°F) and a maximum of 24°C (75°F), leading to an average temperature of 14°C (57°F). Precipitation also decreases significantly from April to May, with April receiving 35 mm (1.4 in) over 5 days, compared to May’s 20 mm (0.8 in) over just 2 days. Additionally, humidity rises slightly in May, reaching 83% compared to April's 79%. For a detailed look at San Francisco's weather in May, check out San Francisco weather in May.

In comparing the weather conditions of April and June, it's evident that June experiences warmer temperatures, with average daily highs reaching 31°C (88°F) compared to April's 28°C (82°F). The minimum temperatures also rise slightly in June, starting at 10°C (51°F) rather than April's 7°C (44°F). While April sees more precipitation with 35 mm (1.4 in) over five days, June remains notably drier, only receiving 3 mm (0.1 in) with no rainy days reported. Additionally, humidity levels are fairly similar, with June recording a humidity of 84% compared to April’s 79%. For more detailed insights, check out San Francisco weather in June.

In April, the weather varies more significantly with temperatures ranging from a cool 7°C (44°F) to a warm 28°C (82°F), averaging around 13°C (55°F). The month sees about 35 mm (1.4 in) of precipitation over five days, making it a relatively wet time with humidity levels around 79%. In contrast, July delivers milder temperatures, with a minimum of 11°C (52°F) and a maximum of 24°C (76°F), maintaining an average of 15°C (60°F). Notably, July experiences minimal precipitation at just 3 mm (0.1 in) over no rainy days, coupled with slightly higher humidity at 87%. For a detailed look at the summer weather, you can refer to San Francisco weather in July.

April and August in San Francisco showcase a notable shift in weather patterns. April typically experiences a wider temperature range, with minimums around 7°C (44°F) and maximums reaching 28°C (82°F), resulting in an average of 13°C (55°F). This month also sees approximately 35 mm (1.4 in) of precipitation over about 5 days, with humidity levels lingering at 79%. In contrast, August presents milder temperatures, with a minimum of 11°C (53°F) and a slightly lower maximum of 27°C (81°F), averaging 16°C (61°F). Notably, August is much drier, receiving only 2 mm (0.1 in) of precipitation across 0 days, and features higher humidity at 87%. For a more detailed overview of August weather, visit San Francisco weather in August.

April and September present contrasting weather patterns. In April, temperatures range from a cool minimum of 7°C (44°F) to a warm average of 13°C (55°F), peaking at 28°C (82°F). This month experiences about 35 mm (1.4 in) of precipitation over approximately 5 days, accompanied by a humidity level of 79%. In contrast, September enjoys warmer conditions with a minimum of 11°C (51°F) and an average temperature of 17°C (63°F), soaring to a maximum of 35°C (96°F). Remarkably, September sees minimal rainfall, averaging only 2 mm (0.1 in) with no rainy days and a slightly higher humidity level of 86%. For those interested in exploring more about September's weather, check out San Francisco weather in September.

When comparing the weather in April and October, both months exhibit relatively mild temperatures. April starts with minimum temperatures around 7°C (44°F) and averages 13°C (55°F), with maximum highs reaching 28°C (82°F). It also sees about 35 mm (1.4 in) of precipitation over roughly 5 days and maintains a humidity level of 79%. In contrast, October features slightly warmer minimums at 9°C (48°F), an average of 16°C (60°F), and similar maximums at 28°C (84°F). Notably, it experiences less rainfall, totaling about 30 mm (1.2 in) across just 2 days, while humidity remains comparable at 80%. For further details on October's weather, you can check San Francisco weather in October.

April and November present similar average temperatures, with April showing a slightly wider range, featuring maximums of up to 28°C (82°F), compared to November's peak of 23°C (74°F). Both months experience an average temperature around 13°C (55°F), but November tends to be slightly cooler overall, especially at night with a minimum temperature of 6°C (43°F) compared to April's 7°C (44°F). Precipitation is more pronounced in November, averaging 50 mm (2.0 in) compared to April's 35 mm (1.4 in), though both months share the same number of rainy days at five. Humidity levels remain constant at 79% throughout both months, creating a similar feel in the air. For more detailed insights on November weather, visit San Francisco weather in November.

April and December present notable contrasts in weather conditions. In April, temperatures range from a mild 7°C (44°F) to a warm 28°C (82°F), with an average of 13°C (55°F). The month experiences relatively light precipitation of 35 mm (1.4 in) over about 5 days and maintains a humidity level of 79%. Conversely, December sees cooler temperatures, with a minimum of 4°C (40°F) and a maximum of 20°C (69°F), averaging around 11°C (52°F). It is also wetter, with 95 mm (3.7 in) of precipitation spread over approximately 9 days, while humidity remains constant at 79%. For more detailed information, you can visit San Francisco weather in December.

Compare San Francisco's Climate with Cities Worldwide

Conclusion: What to Expect From April Weather in San Francisco

April in San Francisco brings a refreshing shift in weather, as the city emerges from the cooler months. With milder temperatures compared to the winter chill, residents and visitors can enjoy more pleasant days while still experiencing the typical coastal humidity. Rainfall, while present, is less frequent than during the winter, making it an ideal time for outdoor exploration. As you soak in the vibrant spring atmosphere, it's the perfect moment to appreciate San Francisco's unique climate. For a deeper understanding of what to expect, check out the full details on San Francisco Climate.