August Weather in Phoenix, United States

Last updated: February 24, 2025

August in Phoenix, United States is characterized by sweltering temperatures, with a maximum reaching an impressive 47°C (116°F) and an average of 35°C (95°F). The evenings offer a brief respite, thanks to a minimum temperature of 22°C (73°F). Despite the heat, the city experiences some relief in the form of precipitation, totaling 39 mm (1.5 in) over 5 days, accompanied by a moderate humidity level of 48%. This blend of intense warmth and occasional showers makes August a unique month in this vibrant desert landscape.

August Temperature in Phoenix

In August, Phoenix reaches its peak warmth, showcasing a min temperature of 22°C (73°F) and an average of 35°C (95°F), while highs soar to 47°C (116°F). This month typically mirrors July's sultry conditions, characterized by robust heat and minimal variation. As the summer progresses, temperatures consistently escalate, peaking at these sweltering levels, making it the hottest month of the year. However, the following months begin to show a dip, as September brings a slight relief, hinting at the transition toward a more temperate fall. Embracing the scorching August sun requires preparation, but it captures the quintessential essence of Phoenix's fierce desert climate.

August Weather in Phoenix: Daily Temperature Highs, Lows, and Averages

The chart illustrates August temperature patterns in Phoenix, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec545764758292959489756555
Data source: Temperature data for Phoenix 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.

August Precipitation in Phoenix

In August, Phoenix experiences a notable uptick in precipitation, with an average of 39 mm (1.5 in) of rain over 5 days. This increase follows the patterns of July, which also saw considerable rainfall, but August often sets the stage for the last waves of summer monsoons. The city's dry spell from April to June, where virtually no rain falls, starkly contrasts with the wetter months preceding the onset of fall. As summer fades, the rise in humidity and precipitation signals a shift, providing a refreshing respite from the persistent heat of earlier months, underscoring the resilience of Phoenix's climate as it prepares for the cooler days ahead.

August Precipitation Trends in Phoenix

The chart displays monthly precipitation patterns in Phoenix, with values for each month alongside August's data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how August's conditions compare to those of other months.
JanFebMarAprMayJunJulAugSepOctNovDec253729122373927262123
Data source: Precipitation data for August generated using information from the Copernicus Climate Change Service.
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August Humidity in Phoenix

In August, Phoenix experiences a notable shift in humidity, peaking at 48%, which is a significant increase from the dry summer months of June and July, where humidity levels hovered around 33% and 34% respectively. This rise marks a transition from the relentless aridity of mid-summer to a more humid atmosphere as the city edges closer to the fall season. Comparatively, this August humidity is a stark contrast to the winter months, such as January and February, when levels soar to 76% and 79%. As temperatures begin to cool in September, we again see humidity levels rise to 64%, indicating a seasonal pattern where late summer and early fall bring increased moisture to the arid desert landscape, creating a refreshing reprieve from the intense dryness of earlier months.

August Average Humidity in Phoenix

This chart illustrates the average monthly humidity levels in Phoenix, with August's data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, allowing you to see how August's humidity levels compare to other months.
JanFebMarAprMayJunJulAugSepOctNovDec76%79%67%55%40%33%34%48%64%67%77%82%
Data source: Humidity data for August generated using information from the Copernicus Climate Change Service.

August UV Index in Phoenix

August in Phoenix brings the sun's rays to their apex, with a UV Index of 11, categorized as extreme. This maintains the trend seen throughout the summer months, where the index peaked at 12 in June. With a short burn time of just 10 minutes, it’s crucial for residents and visitors alike to take precautions against overexposure. As the year unfolds, the UV Index steadily rises from a moderate 4 in January to its summer peak, emphasizing the need for sun safety as the season progresses. Interestingly, the index begins to taper off in September, signaling the approach of milder sun conditions. For more details on navigating the UV landscape in Phoenix, visit Phoenix UV Index.

Maximum UV Index Levels in Phoenix for August

The chart shows the monthly maximum UV Index (UVI) for Phoenix in August, 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.
JanFebMarAprMayJunJulAugSepOctNovDec469101112111110754
Data source: Phoenix August 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.

August Sunshine in Phoenix

August in Phoenix, United States, proudly showcases 346 hours of glorious sunshine, continuing the trend of long, bright days typical of the summer months. Following the peak of 375 hours in June, the city's radiant skies begin to slightly wane, yet still outshine the earlier months of the year, allowing residents and visitors alike to bask in the warmth. This gradual decline from July's 361 hours reflects the transition towards the milder fall months, as September rolls in with 315 hours of sunshine. Overall, August stands as a vibrant testament to Phoenix's sunny disposition, trailing only slightly behind the summer's peak, making it a perfect time for outdoor adventures amidst the lingering warmth.

Monthly Sunshine Duration in Phoenix: August Highlighted

The August sunshine duration represents the total number of hours Phoenix experiences direct sunlight during the month of August, excluding cloudy or obstructed periods. This chart compares the sunshine duration of August with the other months of the year.
JanFebMarAprMayJunJulAugSepOctNovDec195h241h309h331h373h375h361h346h315h297h258h240h
Data source: Phoenix August Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Phoenix During August

In Phoenix, August sees the sun peeking through approximately 59% of the time, marking a notable dip from the peak of 90% in May. This trend reflects a seasonal shift, as the sunniest months transition from late spring to earlier summer. While July plummets to a mere 36% chance of sunny days, August begins to recover slightly, but it's still one of the less sunny months of the year. Following August, September improves to a 70% chance, indicating that the city begins to enjoy more consistent sunshine as it transitions into the fall. Overall, August's weather is a reminder of the unique climate patterns that define life in the desert, blending the stark contrasts of heat with the occasional reprieve of clouds.

Percentage of Sunny Days in August in Phoenix

The chart illustrates the percentage of sunny days in Phoenix throughout the year, with August 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 Phoenix experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec60%73%73%76%90%72%36%59%70%76%71%55%
Data source: Phoenix August chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Phoenix in August

In Phoenix, the August daylight duration marks a subtle shift as summer begins to wane, offering 13 hours of daylight. This month sits comfortably between the peak sunlight of 14 hours experienced in both June and July, while hinting at the imminent decline as autumn approaches. The trend illustrates a gradual progression from the longer days of mid-summer to the shorter hours of fall, creating a rhythmic cycle of light that characterizes the desert landscape. As August unfolds, residents and visitors alike can savor the last of the extended summer days, setting the stage for the cozy evenings that September will soon bring.

Average Daylight Hours in Phoenix for August

The chart illustrates the variation in daylight duration in Phoenix throughout the year, with August highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec10h 12m10h 59m11h 59m13h 1m13h 53m14h 19m14h 5m13h 19m12h 19m11h 18m10h 24m9h 57m
Data source: Phoenix daylight hours, calculated by summing the hours between sunrise and sunset for each day.

August Winds in Phoenix

In August, the winds in Phoenix undergo a noticeable dip, averaging just 1.9 m/s (4 mph), marking it as one of the calmest months of the year. This decline follows a summer peak in June and April, where winds were more invigorating at 2.8 m/s (6 mph). As the summer heat intensifies, the gentle breezes provide a slight reprieve, yet they lack the strength seen earlier in the season. Following August, September continues this subtle trend, with an even lower average wind speed of 1.8 m/s (4 mph). Overall, the pattern reveals a shift from the moderately breezy conditions of spring and early summer to the tranquil, warm days of late summer, effectively encapsulating the calm before the arrival of autumn winds.

Average August Wind Speed in Phoenix

The chart displays monthly wind speed patterns in Phoenix, with values for each month shown alongside August's data, which is highlighted for easy comparison. It illustrates the average wind speed, offering insights into how August's wind conditions compare to the rest of the year.
JanFebMarAprMayJunJulAugSepOctNovDec2.22.42.72.82.62.82.11.9 m/s1.82.42.11.9
Data source: Phoenix August wind data, generated using information from the Copernicus Climate Change Service.

How August Weather in Phoenix Compares to Other Months

The weather in Phoenix 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 Phoenix and find detailed weather information for every month.

August in Phoenix is characterized by scorching temperatures, with highs averaging around 35°C (95°F) and peaking at a blistering 47°C (116°F). The month sees minimal rainfall, averaging 39 mm (1.5 in) over about 5 days, along with a moderate humidity level of 48%. In contrast, January offers a dramatic shift in climate, with temperatures ranging from a chilly -1°C (30°F) to a milder average of 12°C (54°F) and a maximum of 29°C (84°F). Precipitation is lighter, totaling 25 mm (1.0 in) over approximately 4 days, but the humidity is significantly higher at 76%. For more detailed information about January's weather, visit Phoenix weather in January.

August and February present two starkly contrasting weather experiences. In August, temperatures soar with an average high of 35°C (95°F), peaking at an intense 47°C (116°F), while the humidity remains relatively moderate at 48%. Despite some heat, the month sees about 39 mm (1.5 in) of precipitation over approximately 5 days. In contrast, February offers a much cooler climate, with temperatures ranging from a minimum of 1°C (33°F) to a pleasant average of 14°C (57°F), and highs reaching up to 29°C (84°F). The month experiences slightly less precipitation at 37 mm (1.4 in) over just 3 days, but the humidity is notably higher at 79%. For more detailed insights, you can check this link: Phoenix weather in February.

August and March present strikingly contrasting weather patterns. In August, temperatures soar with a minimum of 22°C (73°F) and averages reaching a sweltering 35°C (95°F), peaking at 47°C (116°F). The humidity stands at 48%, and there’s a slight chance of rain, with 39 mm (1.5 in) of precipitation over about 5 days. In contrast, March offers a cooler climate with minimum temperatures dropping to 4°C (39°F), an average of 18°C (65°F), and a maximum temperature of 35°C (95°F). The humidity is notably higher at 67%, and the month sees less rain, with 29 mm (1.2 in) occurring over just 3 days. For more details, check out Phoenix weather in March.

When comparing the weather in April and August, the differences are striking. August is marked by significantly higher temperatures, with average highs reaching 35°C (95°F) and a blistering maximum of 47°C (116°F), while April offers much milder conditions, averaging 24°C (75°F) with a maximum of 39°C (103°F). Precipitation is also notably different; August sees about 39 mm (1.5 in) of rain over five days, whereas April experiences virtually no rainfall, with only 1 mm recorded over zero days. Additionally, humidity levels in August are lower at 48%, compared to April’s steady 55%. For more details on April weather, you can visit Phoenix weather in April.

In comparison, August weather in Phoenix is significantly hotter and more humid than in May. While May features a comfortable average temperature of 28°C (82°F), August experiences sweltering highs averaging around 35°C (95°F), with maximum temperatures soaring up to 47°C (116°F). Additionally, August sees more precipitation, with about 39 mm (1.5 in) over an average of 5 days, whereas May remains mostly dry with only 2 mm (0.1 in) and no rainy days. Humidity levels are also slightly higher in August at 48%, compared to May's 40%. For more details, you can check Phoenix weather in May.

August and June both showcase the intense heat typical of summer, but they differ significantly in precipitation and humidity. In August, temperatures range from a minimum of 22°C (73°F) to a maximum of 47°C (116°F), with an average of 35°C (95°F). The month experiences some rainfall, totaling 39 mm (1.5 in) over about 5 days, and the humidity is relatively higher at 48%. In contrast, June has slightly cooler temperatures, with a minimum of 19°C (66°F) and a maximum of 48°C (119°F), averaging 34°C (93°F). Remarkably, June sees virtually no rain, with only 2 mm (0.1 in) over 0 days and lower humidity at 33%. For a detailed look at June weather, visit Phoenix weather in June.

In comparing the weather between July and August, both months exhibit similar average temperatures, hovering around 35°C (95°F). However, July features slightly cooler minimum and maximum temperatures, with lows of 23°C (74°F) and highs reaching 47°C (118°F), compared to August's minimum of 22°C (73°F) and a maximum of 47°C (116°F). Precipitation levels remain comparable, with July receiving 37 mm (1.4 in) over 6 days, while August follows closely with 39 mm (1.5 in) across 5 days. Notably, humidity is higher in August at 48%, compared to July's 34%. For more detailed information, you can view Phoenix weather in July.

August typically features much hotter temperatures, with an average high of 35°C (95°F) and maximums reaching a scorching 47°C (116°F), making it one of the hottest months of the year. The humidity is relatively lower at 48%, but with 39 mm of precipitation over 5 days, it does bring some relief from the heat. In contrast, September sees a noticeable drop in temperature, with averages around 32°C (89°F) and maximums of 45°C (113°F), while the minimum falls to a cooler 13°C (56°F). Additionally, September has increased humidity at 64% and less rainfall, recording only 27 mm over 3 days. For more details on the weather in September, you can visit Phoenix weather in September.

August and October present a stark contrast in weather conditions. In August, temperatures soar with a minimum of 22°C (73°F) and an average high of 35°C (95°F), reaching extreme highs of 47°C (116°F), while the humidity hovers around 48%. This month also sees approximately 39 mm (1.5 in) of precipitation over about 5 days. In contrast, October offers a much cooler climate, with temperatures ranging from a minimum of 7°C (45°F) to an average of 24°C (76°F), and a maximum of 41°C (105°F). The humidity increases to 67%, but the month experiences only 26 mm (1.0 in) of precipitation over just 2 days. For more details on October weather, check out this link: Phoenix weather in October.

In August, temperatures soar with an impressive average of 35°C (95°F) and can peak at a scorching 47°C (116°F), while humidity levels are a moderate 48%. With a total precipitation of 39 mm (1.5 in) over five days, the month is characterized by notably hot and relatively dry conditions. In contrast, November brings a significant drop in temperatures, with an average of 18°C (66°F) and maximums reaching 36°C (97°F), but featuring much cooler nights with a minimum of just 5°C (41°F). This month experiences less rain, with only 21 mm (0.8 in) falling over just one day, alongside higher humidity at 77%. For a closer look at what to expect, check out Phoenix weather in November.

August and December present strikingly contrasting weather conditions. In August, temperatures soar with a minimum of 22°C (73°F), an average of 35°C (95°F), and can reach a scorching maximum of 47°C (116°F). Despite the heat, rainfall is minimal, with only 39 mm (1.5 in) over approximately five days, leading to a lower humidity level of 48%. In stark contrast, December features much cooler temperatures, with a minimum of 0°C (32°F), an average of 13°C (55°F), and a maximum of 28°C (83°F). Precipitation decreases to 23 mm (0.9 in) over four days, but humidity rises significantly to 82%, giving the month a damp chill. For more details, check out Phoenix weather in December.

Compare Phoenix's Climate with Cities Worldwide

Conclusion: What to Expect From August Weather in Phoenix

August in Phoenix is characterized by its scorching heat, often reaching maximum temperatures that rival the peak summer months. While the average temperature hovers around a sweltering 35°C (95°F), humidity levels remain moderate at 48%, creating a notable contrast to the dry heat experienced in June and July. This month also sees a slight increase in precipitation, with rainfall occurring over five days, providing a rare respite from the relentless sun and hinting at the impending transition to the milder fall temperatures. For a deeper understanding of how Phoenix weather evolves throughout the year, explore more at Phoenix Climate.