Last updated: February 24, 2025
Experience the arid charm of Pasadena in August, where the weather boasts maximum temperatures soaring up to 40°C (105°F) and an inviting average of 25°C (78°F). Expect pleasantly warm days with the minimum temperatures rarely dropping below 15°C (59°F), creating an ideal atmosphere for outdoor activities and exploration. With a strikingly low precipitation amount of just 2 mm (0.1 in) and no rainy days, the humidity remains at a comfortable 39%, ensuring that sunny skies dominate the month. It's the perfect time to enjoy the vibrant surroundings of this picturesque city!
In August, Pasadena experiences a dynamic blend of warmth, with temperatures ranging from a minimum of 15°C (59°F) to a maximum of 40°C (105°F). The average temperature settles at 25°C (78°F), reflecting the peak of summer's heat. As the month unfolds, you can feel the lingering warmth from July, characterized by sweltering days and cooler evenings. This trend demonstrates a gradual transition into late summer, where the intense heat begins to ease, yet daytime highs still command attention. It’s an ideal time to enjoy outdoor activities, but staying hydrated is essential as temperatures can still soar, especially in the afternoons.
In Pasadena, the month of August is a prime example of the region's arid climate, recording a mere 2 mm (0.1 in) of precipitation with no rain days, mirroring the dry patterns established in both July and June. As summer peaks, the stark contrast becomes evident when compared to the wetter months earlier in the year, such as January and March, which receive substantial rainfall, peaking at 85 mm (3.4 in) in March. This trend underscores a significant seasonal shift, where the region transitions from moist winter months to dry summer periods, reflective of a characteristic Mediterranean climate. As the year progresses, only a slight uptick in precipitation can be seen towards September and October, but it remains relatively low, ensuring that August stands out as one of the driest months in Pasadena.
As summer transitions to fall in Pasadena, August stands out with its notably low humidity level, hitting a dry 39%. This dip marks a significant decrease from the humid months earlier in the year, particularly from the 82% in February and 78% in January. The trend reveals a steady decline as the temperatures rise, peaking at a comfortable low in August before the humidity begins to climb again in September to 48%. With the warmer months offering refreshing dryness, outdoor activities flourish, making this time ideal for enjoying the Southern California sunshine. The gradual shift from humidity-rich winter months to the crisp and dry summer encapsulates Pasadena's unique climate journey.
In August, Pasadena experiences a notably high UV Index of 11, placing it firmly in the extreme exposure category, with a burn time of just 10 minutes. This extreme level is consistent with the previous months of June and July, which also recorded a UV Index of 11 and showcased the region's relentless summer sun. The presence of such high UV levels from May through August underscores the importance of sun protection during these summer months, where even brief sun exposure can lead to skin damage. As the month progresses into September, a slight dip to a UV Index of 10 suggests a transition towards very high exposure, marking the end of the most intense sun protection season. For more details on Pasadena's UV trends and safety recommendations, visit Pasadena UV Index.
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In Pasadena, August shines brightly, offering residents and visitors 361 hours of sunshine. This delightful month follows the peak of summer, where July takes the crown with a remarkable 381 hours of sunlight. However, August still boasts an impressive sun-filled experience, making it a perfect time for outdoor activities and social gatherings. As the year transitions into the fall months, the sunlight begins to wane—September invites 315 hours, while October further diminishes to 292 hours. The trend showcases a gradual decline in daylight hours as the year progresses, but August stands out as a golden opportunity to soak up the sun before the cooler days arrive.
In Pasadena, August shines bright as one of the sunniest months of the year, boasting an impressive 82% chance of sunny weather. This trend of abundant sunshine begins in the warmer months, with June reaching 80% and July closely following at 76%. As summer peaks, residents and visitors can expect pleasant, sun-filled days, making it an ideal time for outdoor activities. Looking ahead, the likelihood of sun continues to rise into September, where it peaks at 85%, before gradually tapering off in the fall. Overall, August perfectly encapsulates Pasadena's glorious summer climate, inviting everyone to enjoy the warm, sunny days before the season shifts.
In Pasadena, United States, August marks a gentle decline in daylight hours, with the sun gracing the sky for about 13 hours each day. This seasonal shift follows the sunny highs of June and July, which bask in 14 hours of daylight, a peak that encourages outdoor adventures and late-night gatherings. As summer inches toward its end, the lengthening shadows remind us that change is on the horizon. The pattern over the year reveals a gradual transition from the shorter days of winter, starting at 10 hours in January and February, to the bright summer months, before settling back to a more temperate 12 hours in September. This progression illustrates Pasadena’s embrace of each season, creating a rhythmic dance of light that beckons both visitors and locals to savor every moment under the California sun.
In Pasadena, August brings a continuation of the gentle breeze that has characterized the summer months, with average wind speeds settling at 1.8 m/s (4 mph). This marks a subtle decline from earlier months, reflecting a trend of decreasing wind speed as the year progresses. The wind, which starts off the year brisk at around 2.4 m/s (5 mph), gradually softens through the warmer months of June and July, culminating in August's whispering gusts. As the summer heat lingers, the transition into early fall offers only a slight uptick in wind throughout September, hinting at a tranquil end to the season. This ongoing pattern of mild winds provides a perfect backdrop for outdoor activities in the sun-drenched streets of Pasadena.
The weather in Pasadena changes throughout the year, offering a unique experience in each season. Below is a month-by-month comparison of August's weather with other months, highlighting differences in temperature, precipitation, and other key factors. Click on each section to discover seasonal trends in Pasadena and find detailed weather information for every month.
August and January present stark contrasts in weather. August experiences higher temperatures, ranging from a minimum of 15°C (59°F) to a scorching maximum of 40°C (105°F), with an average of 25°C (78°F). It boasts minimal precipitation, with only 2 mm recorded and no rainy days, alongside low humidity at 39%. In contrast, January features much cooler temperatures, with a minimum of 0°C (32°F) and a maximum of 29°C (84°F), averaging at 12°C (53°F). This month sees significantly higher precipitation levels at 75 mm over 5 days and a humidity level of 78%. For a detailed look at January's conditions, check out Pasadena weather in January.
August and February present stark contrasts in weather. August boasts high average temperatures, ranging from a minimum of 15°C (59°F) to a scorching maximum of 40°C (105°F), with a minimal precipitation of just 2 mm (0.1 in) across the month, resulting in pleasantly dry conditions and a humidity level of 39%. In contrast, February experiences cooler temperatures, averaging 12°C (54°F), with a minimum of 0°C (31°F) and a maximum of 28°C (83°F). February is also significantly wetter, receiving 65 mm (2.6 in) of rainfall over approximately six days, and is characterized by higher humidity at 82%. For more detailed information, you can check out Pasadena weather in February.
August and March exhibit stark contrasts in weather patterns. In August, temperatures soar with an average of 25°C (78°F) and can reach up to 40°C (105°F), while experiencing virtually no precipitation and low humidity at 39%. Conversely, March presents a cooler climate with average temperatures around 13°C (56°F), peaking at 30°C (86°F) and featuring significant rainfall of 85 mm (3.4 in) over approximately 10 days, accompanied by higher humidity levels at 75%. For a detailed overview, check out Pasadena weather in March.
August and April weather present a notable contrast. In August, temperatures soar with a minimum of 15°C (59°F), an average of 25°C (78°F), and a scorching maximum of 40°C (105°F). The month is characterized by very little precipitation, with only 2 mm recorded and no rainy days, along with relatively low humidity at 39%. In contrast, April is cooler, with a minimum temperature of 6°C (43°F) and a maximum of 34°C (94°F), averaging 17°C (62°F). April sees significantly more precipitation at 22 mm over two days, and the humidity is higher at 68%, creating a more varied and refreshing climate. For a detailed look at April's weather conditions, you can visit Pasadena weather in April.
August weather features significantly higher temperatures compared to May, with average highs reaching up to 40°C (105°F) contrasted with May's maximum of 34°C (94°F). While August boasted a dry climate with only 2 mm of precipitation over 0 days, May experiences more rainfall at 16 mm over 3 days, contributing to its higher humidity of 57% compared to August's 39%. These contrasts highlight the transition from the cooler, wetter spring of May to the hot, dry summer days of August. For more detailed information on May's weather patterns, you can visit Pasadena weather in May.
Comparing the weather in August and June, August typically experiences warmer temperatures with an average of 25°C (78°F) compared to June’s average of 22°C (71°F). Both months share the same maximum temperature of 40°C (105°F), but August has a higher minimum temperature of 15°C (59°F) versus June's 11°C (51°F). Precipitation remains minimal in both months, with 2 mm (0.1 in) in August and 1 mm (0.1 in) in June, both with no rainy days. However, June tends to be more humid, with humidity levels at 52%, compared to August’s lower humidity of 39%. For more details about June's weather, refer to Pasadena weather in June.
In comparing the weather between July and August, both months feature similar average temperatures, with August slightly warmer, averaging 25°C (78°F) compared to July's 25°C (77°F). However, July can experience higher maximum temperatures, reaching up to 43°C (109°F), while August's peak is 40°C (105°F). Both months have negligible precipitation, with only 2 mm recorded in July and none in August, indicating a dry spell. Additionally, humidity levels are higher in July at 46%, compared to August's 39%, contributing to a slightly more uncomfortable feel during the earlier month. For more details on July's weather, you can check Pasadena weather in July.
In August, temperatures typically range from a minimum of 15°C (59°F) to a maximum of 40°C (105°F), with an average temperature of around 25°C (78°F). The month sees little rainfall, with only 2 mm (0.1 in) of precipitation over zero rainy days, and humidity levels are relatively low at 39%. In contrast, September experiences slightly cooler temperatures with a minimum of 10°C (51°F) and an average of 23°C (74°F), while still reaching highs of 44°C (112°F). Precipitation increases modestly to 4 mm (0.1 in), yet there are still no rainy days, and humidity rises to 48%. For more detailed insights, check out Pasadena weather in September.
In comparing the weather of August and October, it's evident that October experiences a notable drop in temperatures. While August boasts a minimum of 15°C (59°F) and an average high of 40°C (105°F), October's temperatures range from a cooler minimum of 6°C (44°F) to a maximum of 38°C (101°F) with an average of 20°C (68°F). Additionally, October sees an increase in both precipitation, totaling 9 mm (0.4 in) over one day, and humidity levels, which rise to 59% compared to August's dry 39%. For more detailed information, you can check Pasadena weather in October.
August and November present markedly different weather patterns. In August, temperatures typically range from a mild 15°C (59°F) to a scorching 40°C (105°F), with an average of 25°C (78°F), alongside very low precipitation and humidity levels at 39%. In contrast, November sees much cooler temperatures, with a minimum of 2°C (37°F) and a maximum of 31°C (89°F), averaging 16°C (61°F). Rainfall increases significantly during this month, with 24 mm (0.9 in) over two days, and humidity rises to 72%. For more detailed information, check out Pasadena weather in November.
In August, the weather is characterized by warm temperatures, with a minimum of 15°C (59°F) and a maximum reaching up to 40°C (105°F). This month experiences very little precipitation, averaging just 2 mm over the entire month and boasting no rainy days, while the humidity remains relatively low at 39%. In sharp contrast, December offers much cooler conditions, with temperatures dipping to a minimum of 1°C (33°F) and averaging around 12°C (53°F), peaking at 27°C (81°F). December is also notably wetter, with a total precipitation of 77 mm spread across five rainy days, resulting in a much higher humidity level of 76%. For more detailed insights into December's weather, you can explore Pasadena weather in December.
As August rolls in, Pasadena transforms into a sun-drenched oasis, boasting consistently warm temperatures that stand out from the milder months of the year. With minimal precipitation and an average humidity of just 39%, the dry heat creates a perfect backdrop for outdoor activities and gatherings. This month is characterized by a striking contrast to the cooler, rainier days of winter and early spring, making it ideal for enjoying the city’s vibrant atmosphere. For those interested in a deeper dive into what you can expect throughout the year, check out the insights in Pasadena Climate.