A closer look at the hottest summers in Phoenix history
The summer of 2024 in Phoenix, Arizona stands as the hottest summer ever recorded, with an average seasonal temperature of 98.95°F (37.2°C). This astonishing figure surpassed even the blistering summer of 2023, rewriting the climate record books for the Southwest.
June 2024: The record-breaking opener
June 2024 was a historic scorcher, averaging 97°F (36.1°C). This figure didn’t just break records — it demolished them, beating the previous hottest June by nearly 2 degrees. Typically, June acts as a warm-up to the real summer inferno in Arizona, but last year, the heat arrived early and aggressively, setting the tone for what was to follow.
July and August: Relentless but not the peak
While July and August 2024 were exceptionally hot, they weren’t record-holders on their own. July trailed behind 2023’s historic 102.7°F (39.3°C) mark, and August came in just shy of the 2020 record of 99.1°F (37.3°C). Yet, when combined with that unprecedented June, the three-month average propelled 2024 to the top of the heat rankings.
Comparing the top summers in Phoenix
Coming in at second place, 2023 made headlines with a July average of 102.7°F (39.3°C) — the first time a summer month reached triple digits on average. August 2023, with an average of 98.8°F (37.1°C), ranked as the second-hottest August ever, just below 2020. Interestingly, June 2023 stayed below the 90°F (32.2°C) threshold, creating a deceptive calm before the blaze.
2020 held the record before that with a summer average of 96.72°F (35.96°C). Notably, that August was the hottest in history, while July 2020 stood as the third-hottest on record.
Other noteworthy years include:
- 2015, with a summer average of 95.11°F (35.06°C), marked by consistently warm months.
- 2013, starting strong with a June average of 94.8°F (34.9°C), the fourth-hottest June ever at the time.
- 2007, with a sizzling August at 96.2°F (35.7°C), and 2002, which, although not peaking in any single month, was relentlessly warm throughout.
Even 1981, from the era of big hair and neon colors, sneaks into the list with a summer average of 94.82°F (34.9°C), an outlier for that cooler decade.
The role of August in heat history
August continues to be the decisive month in Phoenix’s summer climatology. Historically, the highest August averages include:
- 2020 at 99.1°F (37.3°C)
- 2023 at 98.8°F (37.1°C)
- 2024 among the top, though not surpassing the above
- 2011, registering 98.3°F (36.8°C) — the fourth-highest August ever
This pattern underscores how late-summer heat waves often tip the seasonal scales in Arizona’s Sonoran Desert climate.
Phoenix continues to redefine the limits of summer endurance, and as climate trends intensify, the thresholds of what’s considered “extreme heat” will likely be pushed even further in the years ahead.
