July Weather in San Diego, United States

Last updated: February 24, 2025

July in San Diego, United States, is characterized by pleasantly warm temperatures, with highs reaching 29°C (85°F) and an average of 21°C (69°F), while the mercury dips to a comfortable 16°C (62°F) at night. This month boasts minimal precipitation, with only 1 mm (0.1 in) recorded and no rainy days, allowing residents and tourists to fully embrace the sunny Californian climate. With a humidity level at 46%, the conditions are ideal for outdoor activities, making July one of the most enjoyable times of the year to experience the vibrant coastal charm of San Diego.

July Temperature in San Diego

In July, San Diego basks in pleasantly warm temperatures, making it one of the most inviting months of the year. With a minimum of 16°C (62°F) during the night, residents and visitors can enjoy mild evenings. The average temperature rises to a comfortable 21°C (69°F), perfectly suited for outdoor activities. Although the maximum temperature reaches 29°C (85°F), the coastal breeze often softens the heat, ensuring a refreshing atmosphere. Comparing to the earlier months, July exhibits a notable increase in warmth, reflecting a clear trend of rising temperatures as summer settles in, while still maintaining a moderate climate that San Diego is celebrated for.

July Weather in San Diego: Daily Temperature Highs, Lows, and Averages

The chart illustrates July temperature patterns in San Diego, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec575758616265697170686358
Data source: Temperature data for San Diego 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.

July Precipitation in San Diego

In July, San Diego experiences a strikingly dry climate, receiving a mere 1 mm (0.1 in) of precipitation and marking no rainy days throughout the month. This trend of decreasing rainfall is evident as the region transitions from the wetter months of January and February, where precipitation peaks at 45 mm (1.8 in) and 55 mm (2.2 in) respectively. Following the minimal rainfall in June, July continues the dry spell, pointing towards a characteristic summer climate in San Diego, where sunshine predominates and outdoor activities thrive. As the warm summer days unfold, the city's residents and visitors alike can relish the virtually rain-free weather, with July typically standing out as one of the driest months of the year.

July Precipitation Trends in San Diego

The chart displays monthly precipitation patterns in San Diego, with values for each month alongside July's data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how July's conditions compare to those of other months.
JanFebMarAprMayJunJulAugSepOctNovDec45553820162114132460
Data source: Precipitation data for July generated using information from the Copernicus Climate Change Service.
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July Humidity in San Diego

July in San Diego brings a refreshing dip in humidity, averaging 46%, which aligns with the trend of decreasing moisture levels as summer progresses. Following a gradual decline from 56% in April to 46% in both July and May, the air becomes crisper, offering a delightful reprieve from the heavier humidity of winter months like January and February, which peak at 72% and 77%, respectively. While the summer continues with August exhibiting even lower humidity at 42%, it’s clear that San Diego's July is characterized by its pleasantly dry conditions, making it an ideal time for outdoor activities and coastal adventures. As the season transitions into autumn, humidity levels begin to rise again, with September jumping to 52%.

July Average Humidity in San Diego

This chart illustrates the average monthly humidity levels in San Diego, with July's data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, allowing you to see how July's humidity levels compare to other months.
JanFebMarAprMayJunJulAugSepOctNovDec72%77%67%56%46%48%46%42%52%58%66%74%
Data source: Humidity data for July generated using information from the Copernicus Climate Change Service.

July UV Index in San Diego

In July, San Diego experiences a consistently extreme UV Index level of 11, mirroring the preceding months of May and June. This significant UV exposure means that residents and visitors alike should be particularly cautious, as the burn time is a swift 10 minutes. As summer peaks, it’s essential to take protective measures against harmful UV rays, especially since the UV Index is expected to decrease slightly in August to a very high level of 10. Notably, the trend from January through July reveals a steady escalation in UV intensity, culminating in this month’s notable extreme classification. For detailed insights on UV levels throughout the year, check out San Diego UV Index.

Maximum UV Index Levels in San Diego for July

The chart shows the monthly maximum UV Index (UVI) for San Diego in July, 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.
JanFebMarAprMayJunJulAugSepOctNovDec468101111111010754
Data source: San Diego July 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.

July Sunshine in San Diego

In San Diego, July shines as the pinnacle of summer sunshine, boasting an impressive 376 hours of bright, golden rays. This vibrant month follows a steady climb in daylight from January's 195 hours, where winter still holds sway, to a sunny crescendo in mid-summer. The gradual increase reveals a clear trend: as the year progresses, daylight hours soar, peaking in July before gently tapering off in the bustling warmth of August with 361 hours. The consistent rise showcases San Diego's reputation as a sun-soaked paradise, making it an ideal destination for those seeking to bask in the beauty of summer days.

Monthly Sunshine Duration in San Diego: July Highlighted

The July sunshine duration represents the total number of hours San Diego experiences direct sunlight during the month of July, excluding cloudy or obstructed periods. This chart compares the sunshine duration of July with the other months of the year.
JanFebMarAprMayJunJulAugSepOctNovDec195h243h299h325h361h366h376h361h318h297h257h231h
Data source: San Diego July Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in San Diego During July

In San Diego, the likelihood of sunny weather in July presents a delightful blend of warmth and brightness, with a 56% chance of sunshine gracing the skies. This month marks a notable shift from the spring months, where the chances of sun dip to as low as 42% in May and rise slightly to 47% in June. As summer peaks, July’s sun probability aligns closely with August’s 60% and mirrors the 63% likelihood prevalent in the surrounding months of January, March, September, October, and November. This trend highlights San Diego's overall sunny disposition, maintaining a relatively consistent likelihood of sunny days throughout much of the year, making it an ideal destination for sunshine seekers.

Percentage of Sunny Days in July in San Diego

The chart illustrates the percentage of sunny days in San Diego throughout the year, with July 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 Diego experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec63%62%63%50%42%47%56%60%63%64%63%47%
Data source: San Diego July chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in San Diego in July

In July, San Diego enjoys a delightful 14 hours of daylight, marking the peak of sunshine for the year. This month stands out in a rhythmic progression that begins in the depths of winter with just 10 hours of daylight in January and gradually ascends as spring unfolds. The increasing light in the spring months of March and April not only heralds warmer weather but also sets the stage for summer's long days. As the year progresses into August, daylight begins to wane slightly, dipping to 13 hours. This gentle decline continues into September and beyond, showcasing a clear trend of longer days at the height of summer, allowing for ample time to revel in San Diego’s beautiful beaches and outdoor activities. The pattern highlights a typical coastal climate, favoring sun-seekers before the shorter days return in the autumn months.

Average Daylight Hours in San Diego for July

The chart illustrates the variation in daylight duration in San Diego throughout the year, with July highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec10h 15m11h 1m12h13h13h 50m14h 15m14h 1m13h 16m12h 19m11h 19m10h 27m10h 1m
Data source: San Diego daylight hours, calculated by summing the hours between sunrise and sunset for each day.

July Winds in San Diego

In July, San Diego experiences a gentle yet consistent breeze, with an average wind speed of 3.1 m/s (7 mph), remaining stable compared to the previous month. This mild wind pattern is part of a broader trend throughout the summer months, where wind speeds hover around the same range, creating an inviting atmosphere for beachgoers and outdoor enthusiasts. Interestingly, after a slight uptick in March and June, wind speeds in July reflect a shift towards more calming conditions, echoing the patterns seen in both August and September. This harmonious blend of temperatures and breezes keeps the coastal city vibrant, while residents and visitors enjoy the pleasant, sun-kissed days that embody the spirit of summer in San Diego.

Average July Wind Speed in San Diego

The chart displays monthly wind speed patterns in San Diego, with values for each month shown alongside July's data, which is highlighted for easy comparison. It illustrates the average wind speed, offering insights into how July's wind conditions compare to the rest of the year.
JanFebMarAprMayJunJulAugSepOctNovDec3.02.73.43.23.13.33.1 m/s3.13.12.82.43.2
Data source: San Diego July wind data, generated using information from the Copernicus Climate Change Service.

How July Weather in San Diego Compares to Other Months

The weather in San Diego changes throughout the year, offering a unique experience in each season. Below is a month-by-month comparison of July's weather with other months, highlighting differences in temperature, precipitation, and other key factors. Click on each section to discover seasonal trends in San Diego and find detailed weather information for every month.

In July, San Diego enjoys warm and pleasant weather, with temperatures ranging from a mild 16°C (62°F) to a maximum of 29°C (85°F) and minimal precipitation, averaging just 1 mm over the month. The humidity is relatively low at 46%, contributing to the comfortable summer climate. In contrast, January features cooler temperatures, with a minimum of 8°C (47°F) and an average of 14°C (58°F). The cooler month also experiences higher precipitation, totaling 45 mm (1.8 in) over about 5 days, along with increased humidity at 72%. For more detailed insights, you can refer to San Diego weather in January.

The weather in July is markedly warmer and drier compared to February. With average temperatures ranging from a minimum of 16°C (62°F) to a maximum of 29°C (85°F) and only 1 mm of precipitation over no rainy days, July boasts a pleasant 46% humidity level. In contrast, February experiences cooler temperatures, with a minimum of 7°C (45°F) and a maximum of 26°C (79°F). This month sees significantly more rainfall, totaling 55 mm (2.2 in) across six days, and a higher humidity level at 77%. For a more detailed look into February weather patterns, you can check San Diego weather in February.

In comparing the weather between July and March, July is characterized by warmer temperatures, with a minimum of 16°C (62°F) and a maximum of 29°C (85°F), while March experiences cooler conditions, ranging from a minimum of 8°C (47°F) to a maximum of 26°C (80°F). July boasts significantly lower precipitation, averaging just 1 mm over no rainy days, whereas March sees 38 mm of rainfall spread across 8 days, contributing to higher humidity levels of 67% compared to July's 46%. For more detailed insights, you can check San Diego weather in March.

July's weather is characterized by warmer temperatures, with an average of 21°C (69°F) and maximums reaching up to 29°C (85°F), while April experiences cooler conditions, averaging 16°C (61°F) and also peaking at 29°C (84°F). Moreover, July stands out for its dryness, with minimal precipitation of only 1 mm (0.1 in) over no rainy days, contrasting sharply with April's 20 mm (0.8 in) of rain spread over two days. The humidity in July is also lower at 46%, compared to April's higher 56%. For a more detailed look at San Diego's weather during this spring month, you can check San Diego weather in April.

In comparing the weather of July and May, July boasts warmer temperatures, with a minimum of 16°C (62°F), an average of 21°C (69°F), and a maximum of 29°C (85°F), while May has a cooler range starting at 12°C (54°F) and peaking at 25°C (78°F). Notably, July experiences negligible precipitation, with only 1 mm recorded over 0 days, in stark contrast to May, which sees 16 mm over 4 days, indicating a wetter month. Despite this rainfall, humidity remains consistent at 46% for both months, creating a comfortable atmosphere, particularly in July's drier conditions. For more detailed insights on May's weather patterns, check out San Diego weather in May.

In comparing the weather between June and July, July offers slightly warmer temperatures with an average of 21°C (69°F) compared to June's average of 18°C (65°F). Both months share similar maximum highs of around 29°C (84°F to 85°F), but July's minimum temperature of 16°C (62°F) is a bit higher than June's 14°C (58°F). Precipitation levels are low in both months, with July recording only 1 mm (0.1 in) and June just slightly higher at 2 mm (0.1 in), both without any rainy days. Additionally, humidity in July is marginally lower at 46%, while June tends to be a bit more humid at 48%. For more detailed information, you can visit San Diego weather in June.

July and August in San Diego exhibit remarkably similar weather patterns, with both months featuring average temperatures around 21°C (69°F). July tends to have slightly lower minimum temperatures at 16°C (62°F) compared to August's 17°C (63°F), while the maximum temperatures remain nearly identical at 29°C (85°F) in July and 29°C (84°F) in August. Precipitation is virtually non-existent in both months, with only 1 mm reported in July and August, and humidity levels are slightly lower in August at 42% compared to July's 46%. For more details on the weather during this time, check out San Diego weather in August.

In comparing the weather between July and September, both months exhibit relatively mild temperatures, with average highs reaching 29°C (85°F) in July and rising slightly to 31°C (88°F) in September. July sees a minimum temperature of 16°C (62°F), which only increases marginally to 17°C (62°F) in September. Precipitation remains low in both months, with July having virtually none and September recording just 3 mm (0.1 in), but both months experience no rainy days. However, September has slightly higher humidity levels at 52%, compared to July's 46%. For a more detailed look at September weather in San Diego, visit San Diego weather in September.

In July, the weather tends to be warm and dry, with average temperatures around 21°C (69°F), reaching a pleasant maximum of 29°C (85°F) and experiencing minimal precipitation, making it an ideal month for outdoor activities. In contrast, October sees slightly cooler temperatures, averaging 20°C (68°F) and occasionally peaking at 32°C (90°F), but it also brings more humidity at 58% and some rainfall, totaling 13 mm over two days. For more details, you can check out San Diego weather in October.

In July, the weather is warm and dry, with temperatures ranging from a mild 16°C (62°F) at night to a peak of 29°C (85°F) during the day. Humidity remains relatively low at 46%, making it an ideal month for outdoor activities. In contrast, November experiences cooler temperatures, with a minimum of 10°C (51°F) and a maximum of 27°C (81°F), alongside increased humidity at 66%. Moreover, November brings some precipitation, averaging 24 mm (0.9 in) over two days, a notable shift from the dry conditions typical of July. For more detailed insights into the weather patterns, you can visit San Diego weather in November.

In July, the weather is pleasantly warm, with average temperatures around 21°C (69°F) and maxima reaching up to 29°C (85°F). The month experiences very little rainfall, with only 1 mm recorded over no rainy days, resulting in a relatively low humidity of 46%. In contrast, December brings cooler temperatures, with averages dropping to 15°C (59°F) and highs of 24°C (76°F). This month is also characterized by increased precipitation, totaling 60 mm over five days, and a higher humidity level of 74%. For more detailed insights, you can check San Diego weather in December.

Compare San Diego's Climate with Cities Worldwide

Conclusion: What to Expect From July Weather in San Diego

July in San Diego is characterized by warm, sunny days and mild nights, making it a stark contrast to the cooler months of the year. With an average temperature of 21°C (69°F) and virtually no rainfall, this month offers ideal weather for beach outings and outdoor activities. The low humidity also adds to the comfort, enabling visitors to enjoy the vibrant summer atmosphere without the oppressive stickiness often found in other parts of California. If you're planning a trip, you can expect clear skies and perfect conditions that set July apart from the cooler, more unpredictable months. For more details on the city's climate, visit San Diego Climate.