Monthly outlook for Fort McDonald, AZ: average high 89.9°, average low 67.2°. That is 2.3° below the climate normal for August. Precipitation is expected on 8 days (about 2.6 inches), against a normal of 5 days and 0.9 inches. The warmest day looks like 9 August (103.5°), the coolest 14 August (61.5°).
89.9°/67.2°
Average high / low
−2.3°
Below normal
8 / 5
Wet days / normal
2.6 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
9 August – 18 August
87.9°
94.2°
-3.5°
19 August – 28 August
93.1°
93.6°
-0.3°
29 August – 7 September
at normal
93.1°
—
August records over 66 years
109.2°7 August 2025All-time high
56.1°22 August 1979All-time low
Climate normals and records are computed from the nearest reference point — Gisela (10 mi).
Mon, 10102° / 69°0.95
102 °
Fort McDonald, Monday, 10 August
Heavy rain. High 102°, low 69°.
Pressure29.91 inHg
Wind8.3 mph SW
Humidity27%
Visibility6.2 mi
Dew point53°
Tue, 1189° / 66°0.1
89 °
Fort McDonald, Tuesday, 11 August
Light rain. High 89°, low 66°.
Pressure29.94 inHg
Wind6.2 mph SW
Humidity37%
Visibility6.2 mi
Dew point57°
Wed, 1286° / 65°0.09
86 °
Fort McDonald, Wednesday, 12 August
Light rain. High 86°, low 65°.
Pressure29.88 inHg
Wind7 mph SW
Humidity37%
Visibility6.2 mi
Dew point56°
Thu, 1374° / 65°0.96
74 °
Fort McDonald, Thursday, 13 August
Rain. High 74°, low 65°.
Pressure29.91 inHg
Wind5.2 mph SW
Humidity71%
Visibility4.5 mi
Dew point62°
Fri, 1479° / 61°0.27
79 °
Fort McDonald, Friday, 14 August
Light rain. High 79°, low 61°.
Pressure29.97 inHg
Wind5.6 mph NE
Humidity59%
Visibility—
Dew point58°
Sat, 1582° / 65°0
82 °
Fort McDonald, Saturday, 15 August
Overcast. High 82°, low 65°.
Pressure30.06 inHg
Wind9.5 mph N
Humidity39%
Visibility—
Dew point50°
Sun, 1684° / 67°0
84 °
Fort McDonald, Sunday, 16 August
Overcast. High 84°, low 67°.
Pressure30.06 inHg
Wind9.2 mph SW
Humidity36%
Visibility—
Dew point47°
Mon, 1788° / 66°0
88 °
Fort McDonald, Monday, 17 August
Clear. High 88°, low 66°.
Pressure29.97 inHg
Wind8.9 mph SW
Humidity32%
Visibility—
Dew point49°
Tue, 1892° / 68°0
92 °
Fort McDonald, Tuesday, 18 August
Clear. High 92°, low 68°.
Pressure29.94 inHg
Wind10 mph W
Humidity24%
Visibility—
Dew point44°
Wed, 1993° / 68°0.02
93 °
Fort McDonald, Wednesday, 19 August
Light rain. High 93°, low 68°.
Pressure29.97 inHg
Wind8.2 mph S
Humidity30%
Visibility—
Dew point49°
Thu, 2093° / 68°0.07
93 °
Fort McDonald, Thursday, 20 August
Light rain. High 93°, low 68°.
Pressure29.97 inHg
Wind12 mph S
Humidity31%
Visibility—
Dew point51°
Fri, 2193° / 66°0.07
93 °
Fort McDonald, Friday, 21 August
Light rain. High 93°, low 66°.
Pressure30.00 inHg
Wind13.6 mph SW
Humidity40%
Visibility—
Dew point56°
Sat, 2292° / 67°0
92 °
Fort McDonald, Saturday, 22 August
Partly cloudy. High 92°, low 67°.
Pressure29.94 inHg
Wind10.6 mph SW
Humidity35%
Visibility—
Dew point53°
Sun, 2395° / 70°0.02
95 °
Fort McDonald, Sunday, 23 August
Light rain. High 95°, low 70°.
Pressure29.94 inHg
Wind11.7 mph SW
Humidity30%
Visibility—
Dew point51°
Mon, 2493° / 68°0.08
93 °
Fort McDonald, Monday, 24 August
Light rain. High 93°, low 68°.
Pressure29.97 inHg
Wind11.5 mph SW
Humidity31%
Visibility—
Dew point50°
From day 17 onward the outlook is built from 60-year climate statistics
Tue, 2593° / 68°0.05
93 °
Fort McDonald, Tuesday, 25 August
Climate normal for this date — 60-year average.
Average high93°
Average low68°
Average precipitation0.05 in
Chance of precipitation35%
Record high103° (2011)
Record low60° (1992)
Wed, 2694° / 68°0.04
94 °
Fort McDonald, Wednesday, 26 August
Climate normal for this date — 60-year average.
Average high94°
Average low68°
Average precipitation0.04 in
Chance of precipitation27%
Record high105° (2020)
Record low59° (1992)
Thu, 2794° / 68°0.05
94 °
Fort McDonald, Thursday, 27 August
Climate normal for this date — 60-year average.
Average high94°
Average low68°
Average precipitation0.05 in
Chance of precipitation28%
Record high105° (2011)
Record low61° (1992)
Fri, 2895° / 68°0.05
95 °
Fort McDonald, Friday, 28 August
Climate normal for this date — 60-year average.
Average high95°
Average low68°
Average precipitation0.05 in
Chance of precipitation35%
Record high105° (2011)
Record low61° (2016)
Sat, 2994° / 68°0.06
94 °
Fort McDonald, Saturday, 29 August
Climate normal for this date — 60-year average.
Average high94°
Average low68°
Average precipitation0.06 in
Chance of precipitation33%
Record high104° (2023)
Record low60° (1960)
Sun, 3094° / 68°0.04
94 °
Fort McDonald, Sunday, 30 August
Climate normal for this date — 60-year average.
Average high94°
Average low68°
Average precipitation0.04 in
Chance of precipitation33%
Record high103° (2011)
Record low60° (1992)
Mon, 3194° / 68°0.03
94 °
Fort McDonald, Monday, 31 August
Climate normal for this date — 60-year average.
Average high94°
Average low68°
Average precipitation0.03 in
Chance of precipitation23%
Record high103° (2011)
Record low61° (1961)
Tue, 0193° / 68°0.04
93 °
Fort McDonald, Tuesday, 1 September
Climate normal for this date — 60-year average.
Average high93°
Average low68°
Average precipitation0.04 in
Chance of precipitation32%
Record high102° (1995)
Record low58° (1992)
Wed, 0293° / 67°0.04
93 °
Fort McDonald, Wednesday, 2 September
Climate normal for this date — 60-year average.
Average high93°
Average low67°
Average precipitation0.04 in
Chance of precipitation25%
Record high101° (1995)
Record low56° (1992)
Thu, 0393° / 68°0.03
93 °
Fort McDonald, Thursday, 3 September
Climate normal for this date — 60-year average.
Average high93°
Average low68°
Average precipitation0.03 in
Chance of precipitation17%
Record high104° (2020)
Record low51° (1961)
Fri, 0493° / 67°0.06
93 °
Fort McDonald, Friday, 4 September
Climate normal for this date — 60-year average.
Average high93°
Average low67°
Average precipitation0.06 in
Chance of precipitation30%
Record high104° (2020)
Record low52° (1961)
Sat, 0592° / 67°0.09
92 °
Fort McDonald, Saturday, 5 September
Climate normal for this date — 60-year average.
Average high92°
Average low67°
Average precipitation0.09 in
Chance of precipitation28%
Record high105° (2024)
Record low56° (1961)
Sun, 0692° / 67°0.06
92 °
Fort McDonald, Sunday, 6 September
Climate normal for this date — 60-year average.
Average high92°
Average low67°
Average precipitation0.06 in
Chance of precipitation28%
Record high105° (2020)
Record low57° (1970)
Mon, 0792° / 67°0.04
92 °
Fort McDonald, Monday, 7 September
Climate normal for this date — 60-year average.
Average high92°
Average low67°
Average precipitation0.04 in
Chance of precipitation27%
Record high103° (2020)
Record low59° (1970)
About the monthly outlook
How accurate is a 30-day forecast?
The first 16 days come from weather models — reliable for the first 3–5 days and progressively less so after that. Days 17 through 30 for Fort McDonald, AZ are built from the climate normal, the 60-year average, so they show typical weather for those dates rather than a specific forecast.
What does "above normal" mean?
We compare the forecast against the climate normal for those exact calendar days, computed from 60 years of observations. The deviation shows how much the coming month differs from a typical one.
Where do the 66-year records come from?
They are real temperature extremes recorded in Fort McDonald, AZ since 1960: the highest and lowest reading for each calendar date, with the year it happened.
How often is it updated?
The forecast portion refreshes every hour; the climate portion is based on long-term data and stays stable.