Monthly outlook for Chappaqua, NY: average high 80.7°, average low 63.7°. That is 0° below the climate normal for August. Precipitation is expected on 7 days (about 3.1 inches), against a normal of 6 days and 2.2 inches. The warmest day looks like 10 August (91.3°), the coolest 15 August (54°).
80.7°/63.7°
Average high / low
−0°
Below normal
7 / 6
Wet days / normal
3.1 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
8 August – 17 August
83°
81.6°
+0.8°
18 August – 27 August
77°
79.8°
-1.5°
28 August – 6 September
at normal
78.5°
—
August records over 66 years
99.7°9 August 2001All-time high
50.7°29 August 1982All-time low
Climate normals and records are computed from the nearest reference point — Byram (12 mi).
Sun, 0989° / 72°0
89 °
Chappaqua, Sunday, 9 August
Clear. High 89°, low 72°.
Pressure29.94 inHg
Wind7.6 mph NW
Humidity45%
Visibility6.2 mi
Dew point64°
Mon, 1091° / 70°0
91 °
Chappaqua, Monday, 10 August
Overcast. High 91°, low 70°.
Pressure29.97 inHg
Wind6 mph SW
Humidity47%
Visibility6.2 mi
Dew point63°
Tue, 1190° / 71°0.04
90 °
Chappaqua, Tuesday, 11 August
Light rain. High 90°, low 71°.
Pressure29.85 inHg
Wind8.5 mph NW
Humidity37%
Visibility6.2 mi
Dew point57°
Wed, 1279° / 68°0.35
79 °
Chappaqua, Wednesday, 12 August
Rain. High 79°, low 68°.
Pressure29.77 inHg
Wind4.3 mph N
Humidity76%
Visibility6.2 mi
Dew point66°
Thu, 1386° / 63°0.07
86 °
Chappaqua, Thursday, 13 August
Light rain. High 86°, low 63°.
Pressure29.71 inHg
Wind13 mph NW
Humidity41%
Visibility—
Dew point57°
Fri, 1476° / 59°0
76 °
Chappaqua, Friday, 14 August
Partly cloudy. High 76°, low 59°.
Pressure29.94 inHg
Wind9.8 mph NW
Humidity42%
Visibility—
Dew point45°
Sat, 1574° / 54°0
74 °
Chappaqua, Saturday, 15 August
Clear. High 74°, low 54°.
Pressure30.15 inHg
Wind9.1 mph N
Humidity39%
Visibility—
Dew point42°
Sun, 1677° / 56°0
77 °
Chappaqua, Sunday, 16 August
Overcast. High 77°, low 56°.
Pressure30.30 inHg
Wind6.2 mph NW
Humidity42%
Visibility—
Dew point46°
Mon, 1782° / 60°0
82 °
Chappaqua, Monday, 17 August
Overcast. High 82°, low 60°.
Pressure30.21 inHg
Wind9.9 mph S
Humidity42%
Visibility—
Dew point49°
Tue, 1878° / 67°0.22
78 °
Chappaqua, Tuesday, 18 August
Light rain. High 78°, low 67°.
Pressure30.00 inHg
Wind7.4 mph W
Humidity89%
Visibility—
Dew point67°
Wed, 1982° / 66°0
82 °
Chappaqua, Wednesday, 19 August
Mostly clear. High 82°, low 66°.
Pressure29.88 inHg
Wind7.8 mph N
Humidity64%
Visibility—
Dew point62°
Thu, 2081° / 61°0.01
81 °
Chappaqua, Thursday, 20 August
Light rain. High 81°, low 61°.
Pressure30.00 inHg
Wind7.8 mph N
Humidity54%
Visibility—
Dew point53°
Fri, 2173° / 65°1.56
73 °
Chappaqua, Friday, 21 August
Heavy rain. High 73°, low 65°.
Pressure29.97 inHg
Wind8.1 mph SE
Humidity92%
Visibility—
Dew point64°
Sat, 2279° / 64°0.79
79 °
Chappaqua, Saturday, 22 August
Heavy rain. High 79°, low 64°.
Pressure29.80 inHg
Wind6.9 mph NW
Humidity96%
Visibility—
Dew point67°
Sun, 2370° / 55°0
70 °
Chappaqua, Sunday, 23 August
Clear. High 70°, low 55°.
Pressure29.94 inHg
Wind16.4 mph NW
Humidity46%
Visibility—
Dew point40°
From day 17 onward the outlook is built from 60-year climate statistics
Mon, 2479° / 65°0.07
79 °
Chappaqua, Monday, 24 August
Climate normal for this date — 60-year average.
Average high79°
Average low65°
Average precipitation0.07 in
Chance of precipitation22%
Record high92° (1998)
Record low54° (1971)
Tue, 2580° / 65°0.08
80 °
Chappaqua, Tuesday, 25 August
Climate normal for this date — 60-year average.
Average high80°
Average low65°
Average precipitation0.08 in
Chance of precipitation23%
Record high93° (1968)
Record low56° (1971)
Wed, 2680° / 66°0.06
80 °
Chappaqua, Wednesday, 26 August
Climate normal for this date — 60-year average.
Average high80°
Average low66°
Average precipitation0.06 in
Chance of precipitation25%
Record high90° (1993)
Record low56° (2019)
Thu, 2781° / 67°0.16
81 °
Chappaqua, Thursday, 27 August
Climate normal for this date — 60-year average.
Average high81°
Average low67°
Average precipitation0.16 in
Chance of precipitation35%
Record high93° (1980)
Record low56° (1969)
Fri, 2880° / 67°0.21
80 °
Chappaqua, Friday, 28 August
Climate normal for this date — 60-year average.
Average high80°
Average low67°
Average precipitation0.21 in
Chance of precipitation38%
Record high93° (2024)
Record low57° (1986)
Sat, 2979° / 66°0.14
79 °
Chappaqua, Saturday, 29 August
Climate normal for this date — 60-year average.
Average high79°
Average low66°
Average precipitation0.14 in
Chance of precipitation30%
Record high92° (2018)
Record low51° (1982)
Sun, 3080° / 66°0.08
80 °
Chappaqua, Sunday, 30 August
Climate normal for this date — 60-year average.
Average high80°
Average low66°
Average precipitation0.08 in
Chance of precipitation30%
Record high92° (1973)
Record low53° (1965)
Mon, 3179° / 65°0.05
79 °
Chappaqua, Monday, 31 August
Climate normal for this date — 60-year average.
Average high79°
Average low65°
Average precipitation0.05 in
Chance of precipitation18%
Record high94° (2010)
Record low54° (1976)
Tue, 0178° / 65°0.09
78 °
Chappaqua, Tuesday, 1 September
Climate normal for this date — 60-year average.
Average high78°
Average low65°
Average precipitation0.09 in
Chance of precipitation27%
Record high94° (2010)
Record low53° (2017)
Wed, 0278° / 64°0.18
78 °
Chappaqua, Wednesday, 2 September
Climate normal for this date — 60-year average.
Average high78°
Average low64°
Average precipitation0.18 in
Chance of precipitation32%
Record high92° (2010)
Record low51° (2017)
Thu, 0378° / 64°0.11
78 °
Chappaqua, Thursday, 3 September
Climate normal for this date — 60-year average.
Average high78°
Average low64°
Average precipitation0.11 in
Chance of precipitation32%
Record high91° (2015)
Record low53° (1967)
Fri, 0478° / 65°0.12
78 °
Chappaqua, Friday, 4 September
Climate normal for this date — 60-year average.
Average high78°
Average low65°
Average precipitation0.12 in
Chance of precipitation27%
Record high90° (2023)
Record low54° (1997)
Sat, 0578° / 64°0.06
78 °
Chappaqua, Saturday, 5 September
Climate normal for this date — 60-year average.
Average high78°
Average low64°
Average precipitation0.06 in
Chance of precipitation25%
Record high92° (2023)
Record low55° (2000)
Sun, 0677° / 64°0.2
77 °
Chappaqua, Sunday, 6 September
Climate normal for this date — 60-year average.
Average high77°
Average low64°
Average precipitation0.2 in
Chance of precipitation35%
Record high93° (2023)
Record low53° (1984)
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 Chappaqua, NY 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 Chappaqua, NY 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.