Monthly outlook for Duarte, CA: average high 90.6°, average low 69.1°. That is 0.6° above the climate normal for August. Precipitation is expected on 0 days (about 0.0 inches), against a normal of 0 days and 0.1 inches. The warmest day looks like 9 August (95.9°), the coolest 22 August (65.9°).
90.6°/69.1°
Average high / low
+0.6°
Above normal
0 / 0
Wet days / normal
0.0 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
8 August – 17 August
90.8°
90.1°
+0.4°
18 August – 27 August
90.3°
89.7°
+0.3°
28 August – 6 September
at normal
91.6°
—
August records over 66 years
108.1°25 August 1985All-time high
53.4°22 August 1968All-time low
Climate normals and records are computed from the nearest reference point — South Monrovia Island (4 mi).
Sun, 0996° / 67°0
96 °
Duarte, Sunday, 9 August
Partly cloudy. High 96°, low 67°.
Pressure29.88 inHg
Wind9.8 mph S
Humidity23%
Visibility6.2 mi
Dew point51°
Mon, 1094° / 68°0
94 °
Duarte, Monday, 10 August
Mostly clear. High 94°, low 68°.
Pressure29.94 inHg
Wind9.4 mph S
Humidity27%
Visibility6.2 mi
Dew point52°
Tue, 1192° / 73°0
92 °
Duarte, Tuesday, 11 August
Overcast. High 92°, low 73°.
Pressure29.97 inHg
Wind9.4 mph S
Humidity27%
Visibility6.2 mi
Dew point50°
Wed, 1290° / 68°0
90 °
Duarte, Wednesday, 12 August
Clear. High 90°, low 68°.
Pressure29.91 inHg
Wind8.8 mph S
Humidity32%
Visibility6.2 mi
Dew point52°
Thu, 1384° / 68°0
84 °
Duarte, Thursday, 13 August
Overcast. High 84°, low 68°.
Pressure29.94 inHg
Wind9.1 mph S
Humidity40%
Visibility—
Dew point52°
Fri, 1483° / 66°0
83 °
Duarte, Friday, 14 August
Overcast. High 83°, low 66°.
Pressure30.00 inHg
Wind9.1 mph S
Humidity44%
Visibility—
Dew point53°
Sat, 1589° / 68°0
89 °
Duarte, Saturday, 15 August
Clear. High 89°, low 68°.
Pressure30.03 inHg
Wind9.5 mph S
Humidity33%
Visibility—
Dew point50°
Sun, 1691° / 69°0
91 °
Duarte, Sunday, 16 August
Overcast. High 91°, low 69°.
Pressure30.06 inHg
Wind9.8 mph S
Humidity26%
Visibility—
Dew point46°
Mon, 1795° / 72°0
95 °
Duarte, Monday, 17 August
Clear. High 95°, low 72°.
Pressure30.00 inHg
Wind9.1 mph S
Humidity22%
Visibility—
Dew point44°
Tue, 1895° / 75°0
95 °
Duarte, Tuesday, 18 August
Overcast. High 95°, low 75°.
Pressure29.97 inHg
Wind8.8 mph S
Humidity24%
Visibility—
Dew point48°
Wed, 1994° / 73°0
94 °
Duarte, Wednesday, 19 August
Overcast. High 94°, low 73°.
Pressure29.94 inHg
Wind9.9 mph S
Humidity31%
Visibility—
Dew point53°
Thu, 2090° / 71°0
90 °
Duarte, Thursday, 20 August
Clear. High 90°, low 71°.
Pressure29.94 inHg
Wind10.1 mph S
Humidity36%
Visibility—
Dew point55°
Fri, 2187° / 67°0
87 °
Duarte, Friday, 21 August
Clear. High 87°, low 67°.
Pressure29.94 inHg
Wind10.9 mph S
Humidity37%
Visibility—
Dew point53°
Sat, 2287° / 66°0
87 °
Duarte, Saturday, 22 August
Clear. High 87°, low 66°.
Pressure29.97 inHg
Wind10.5 mph S
Humidity37%
Visibility—
Dew point51°
Sun, 2389° / 67°0
89 °
Duarte, Sunday, 23 August
Clear. High 89°, low 67°.
Pressure29.94 inHg
Wind10.3 mph S
Humidity37%
Visibility—
Dew point53°
From day 17 onward the outlook is built from 60-year climate statistics
Mon, 2490° / 65°0
90 °
Duarte, Monday, 24 August
Climate normal for this date — 60-year average.
Average high90°
Average low65°
Average precipitation0 in
Chance of precipitation0%
Record high105° (1985)
Record low56° (1978)
Tue, 2591° / 65°0
91 °
Duarte, Tuesday, 25 August
Climate normal for this date — 60-year average.
Average high91°
Average low65°
Average precipitation0 in
Chance of precipitation2%
Record high108° (1985)
Record low57° (1978)
Wed, 2691° / 66°0
91 °
Duarte, Wednesday, 26 August
Climate normal for this date — 60-year average.
Average high91°
Average low66°
Average precipitation0 in
Chance of precipitation2%
Record high107° (1981)
Record low55° (1990)
Thu, 2792° / 65°0
92 °
Duarte, Thursday, 27 August
Climate normal for this date — 60-year average.
Average high92°
Average low65°
Average precipitation0 in
Chance of precipitation0%
Record high108° (1981)
Record low55° (1973)
Fri, 2893° / 66°0
93 °
Duarte, Friday, 28 August
Climate normal for this date — 60-year average.
Average high93°
Average low66°
Average precipitation0 in
Chance of precipitation0%
Record high107° (1981)
Record low56° (1973)
Sat, 2993° / 67°0
93 °
Duarte, Saturday, 29 August
Climate normal for this date — 60-year average.
Average high93°
Average low67°
Average precipitation0 in
Chance of precipitation2%
Record high107° (1967)
Record low56° (1964)
Sun, 3092° / 67°0
92 °
Duarte, Sunday, 30 August
Climate normal for this date — 60-year average.
Average high92°
Average low67°
Average precipitation0 in
Chance of precipitation0%
Record high107° (1967)
Record low57° (2010)
Mon, 3191° / 65°0
91 °
Duarte, Monday, 31 August
Climate normal for this date — 60-year average.
Average high91°
Average low65°
Average precipitation0 in
Chance of precipitation3%
Record high106° (2017)
Record low56° (2010)
Tue, 0191° / 65°0.02
91 °
Duarte, Tuesday, 1 September
Climate normal for this date — 60-year average.
Average high91°
Average low65°
Average precipitation0.02 in
Chance of precipitation3%
Record high107° (2002)
Record low56° (1973)
Wed, 0291° / 66°0.02
91 °
Duarte, Wednesday, 2 September
Climate normal for this date — 60-year average.
Average high91°
Average low66°
Average precipitation0.02 in
Chance of precipitation5%
Record high109° (1982)
Record low54° (1964)
Thu, 0391° / 66°0
91 °
Duarte, Thursday, 3 September
Climate normal for this date — 60-year average.
Average high91°
Average low66°
Average precipitation0 in
Chance of precipitation5%
Record high111° (1988)
Record low56° (2000)
Fri, 0492° / 66°0
92 °
Duarte, Friday, 4 September
Climate normal for this date — 60-year average.
Average high92°
Average low66°
Average precipitation0 in
Chance of precipitation2%
Record high110° (1988)
Record low56° (1999)
Sat, 0592° / 67°0.01
92 °
Duarte, Saturday, 5 September
Climate normal for this date — 60-year average.
Average high92°
Average low67°
Average precipitation0.01 in
Chance of precipitation3%
Record high113° (2020)
Record low57° (2015)
Sun, 0692° / 66°0.01
92 °
Duarte, Sunday, 6 September
Climate normal for this date — 60-year average.
Average high92°
Average low66°
Average precipitation0.01 in
Chance of precipitation3%
Record high116° (2024)
Record low57° (1987)
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 Duarte, CA 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 Duarte, CA 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.