Phoenix weather in August: Phoenix, Arizona: normal highs, lows, rain and records for August
Phoenix in August has a normal high of 105°F and a normal low of 84°F, a daily mean of 94°F, falling from 106°F on the 1st to 104°F by the 31st. Measurable precipitation falls on 5 days in a normal August, 0.93 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 41°C and low of 29°C, 24 mm of precipitation in August.
- NOAA stationPhoenix Sky Harbor International Airport
- Station IDUSW00023183
- Location33.43°N 112.00°W
- Elevation1,107 ft (337 m)
- From the center11 miles
- Population1,673,164
- Jan 68° 46°
- Feb 71° 49°
- Mar 78° 55°
- Apr 86° 61°
- May 95° 70°
- Jun 104° 79°
- Jul 107° 85°
- Aug 105° 84°
- Sep 100° 78°
- Oct 89° 66°
- Nov 77° 54°
- Dec 66° 45°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Phoenix in August?
The normal high is 105°F and the normal low 84°F, for a daily mean of 94.4°F. August is 1.1°F cooler than July and 5.2°F warmer than September. August is the 2nd warmest month of the year in Phoenix and the wettest. Across the month the normal high falls 2°F, from 106°F on August 1 to 104°F on August 31. From one year to the next August's mean temperature typically moves about 1.9°F either way (NOAA's standard deviation), so roughly two Augusts in three average between 93°F and 96°F.
Bars above: each day's normal high to low. Columns below: the chance of 0.01 inch or more of precipitation that day, on a scale of 0 to 100% (highest 15%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| August 1 | 106°F | 85°F | 15% | 8% |
| August 8 | 105°F | 84°F | 15% | 8% |
| August 15 | 105°F | 84°F | 15% | 8% |
| August 22 | 105°F | 83°F | 14% | 7% |
| August 31 | 104°F | 82°F | 13% | 6% |
Every day of August: normal high, low and chance of precipitation (warmest afternoon August 1, coldest night August 31)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| August 1 | 106°F | 85°F | 15% | 8% | 13 h 50 min |
| August 2 | 106°F | 85°F | 15% | 8% | 13 h 50 min |
| August 3 | 106°F | 85°F | 15% | 8% | 13 h 50 min |
| August 4 | 106°F | 84°F | 15% | 8% | 13 h 40 min |
| August 5 | 106°F | 84°F | 15% | 8% | 13 h 40 min |
| August 6 | 106°F | 84°F | 15% | 8% | 13 h 40 min |
| August 7 | 105°F | 84°F | 15% | 8% | 13 h 40 min |
| August 8 | 105°F | 84°F | 15% | 8% | 13 h 40 min |
| August 9 | 105°F | 84°F | 15% | 8% | 13 h 40 min |
| August 10 | 105°F | 84°F | 15% | 8% | 13 h 30 min |
| August 11 | 105°F | 84°F | 15% | 8% | 13 h 30 min |
| August 12 | 105°F | 84°F | 15% | 8% | 13 h 30 min |
| August 13 | 105°F | 84°F | 15% | 8% | 13 h 30 min |
| August 14 | 105°F | 84°F | 15% | 8% | 13 h 30 min |
| August 15 | 105°F | 84°F | 15% | 8% | 13 h 30 min |
| August 16 | 105°F | 84°F | 15% | 8% | 13 h 20 min |
| August 17 | 105°F | 84°F | 15% | 8% | 13 h 20 min |
| August 18 | 105°F | 84°F | 15% | 8% | 13 h 20 min |
| August 19 | 105°F | 84°F | 15% | 8% | 13 h 20 min |
| August 20 | 105°F | 83°F | 15% | 8% | 13 h 20 min |
| August 21 | 105°F | 83°F | 14% | 7% | 13 h 10 min |
| August 22 | 105°F | 83°F | 14% | 7% | 13 h 10 min |
| August 23 | 105°F | 83°F | 14% | 7% | 13 h 10 min |
| August 24 | 105°F | 83°F | 14% | 7% | 13 h 10 min |
| August 25 | 105°F | 83°F | 14% | 7% | 13 h 10 min |
| August 26 | 105°F | 83°F | 14% | 7% | 13 h 10 min |
| August 27 | 105°F | 83°F | 14% | 7% | 13 h |
| August 28 | 105°F | 83°F | 13% | 7% | 13 h |
| August 29 | 104°F | 83°F | 13% | 7% | 13 h |
| August 30 | 104°F | 82°F | 13% | 7% | 13 h |
| August 31 | 104°F | 82°F | 13% | 6% | 13 h |
- Normal high
- 105°FAugust average
- Normal low
- 84°FAugust average
- Precipitation
- 0.93 inmonth total
- Days with precipitation
- 50.01 inch or more
- Days at 90°F or more
- 31
- Daylight
- 13 h 50 min to 13 hAugust 1 to August 31
- Days at 70°F or more
- 31
- Days at 80°F or more
- 31
- Sunshine
- 93%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00023183; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Phoenix in August?
On a given August day the chance of 0.01 inch or more is 14% on average, highest around August 8 (15%). In all, 0.93 in falls on 5 days of a normal August.
In a normal August in Phoenix, 31 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00023183.
How humid and windy is Phoenix in August?
At 3 p.m. the normal temperature is 102°F with 21% relative humidity and a dew point of 55°F; at 6 a.m. it is 84°F with 45% humidity. The wind averages 6.6 mph, most often from the west-southwest in the afternoon.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 84°F | 60°F | 45% | 5.3 mph | 42% |
| 9 a.m. | 89°F | 60°F | 37% | 6.8 mph | 53% |
| noon | 97°F | 58°F | 27% | 6.1 mph | 42% |
| 3 p.m. | 102°F | 55°F | 21% | 7.3 mph | 36% |
| 6 p.m. | 100°F | 54°F | 21% | 8.7 mph | 32% |
| 9 p.m. | 94°F | 56°F | 28% | 6.9 mph | 42% |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00023183. Hourly normals exist only for NOAA's first-order stations; a dash where NOAA publishes no value for that hour (the sky at some hours).
What are the records for August in Phoenix?
The warmest August temperature on Phoenix's official record (since 1895) is 118°F, on August 7, 2025; the coldest is 58°F, on August 20, 1917. The wettest August brought 5.33 in (1951).
The August mean against the 1991-2020 normal of 94.4°F: 2021 92.6°F (−1.8), 2022 93.3°F (−1.1), 2023 98.8°F (+4.4), 2024 98.7°F (+4.3), 2025 98.2°F (+3.8), 2026 98.5°F (+4.1). 4 of 6 ran warmer than normal.
| August | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 92.6°F | −1.8°F | 1.54 in |
| 2022 | 93.3°F | −1.1°F | 0.91 in |
| 2023 | 98.8°F | +4.4°F | 0.12 in |
| 2024 | 98.7°F | +4.3°F | 0.35 in |
| 2025 | 98.2°F | +3.8°F | 0.34 in |
| 2026 | 98.5°F | +4.1°F | 0.95 in |
Source: records: ACIS, NWS threaded record PHXthr; recent months: ACIS, station USW00023183. Records and recent months use complete months only.
How does August in Phoenix compare across Arizona?
Across the 97 places PlainClimate covers in Arizona, August normal highs run from 73°F in Greer to 109°F in Bullhead City; Phoenix's is 105°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.