Monthly outlook for Smithtown, NY: average high 80.5°, average low 70°. That is 1.6° above the climate normal for August. Precipitation is expected on 6 days (about 2.7 inches), against a normal of 5 days and 2.3 inches. The warmest day looks like 9 August (91.6°), the coolest 23 August (62.9°).
80.5°/70°
Average high / low
+1.6°
Above normal
6 / 5
Wet days / normal
2.7 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
8 August – 17 August
82.9°
78.3°
+2.6°
18 August – 27 August
76.6°
76.9°
-0.1°
28 August – 6 September
at normal
75.8°
—
August records over 66 years
92.3°27 August 2020All-time high
52.7°29 August 1982All-time low
Climate normals and records are computed from the nearest reference point — Farmingdale (15 mi).
Sun, 0992° / 74°0.01
92 °
Smithtown, Sunday, 9 August
Light rain. High 92°, low 74°.
Pressure29.94 inHg
Wind6.6 mph W
Humidity50%
Visibility6.2 mi
Dew point66°
Mon, 1088° / 72°0
88 °
Smithtown, Monday, 10 August
Light rain. High 88°, low 72°.
Pressure29.97 inHg
Wind4.3 mph SW
Humidity47%
Visibility6.2 mi
Dew point61°
Tue, 1189° / 77°0.02
89 °
Smithtown, Tuesday, 11 August
Light rain. High 89°, low 77°.
Pressure29.85 inHg
Wind7.5 mph NW
Humidity47%
Visibility6.2 mi
Dew point62°
Wed, 1278° / 72°0.41
78 °
Smithtown, Wednesday, 12 August
Rain. High 78°, low 72°.
Pressure29.74 inHg
Wind7.7 mph NW
Humidity72%
Visibility6.2 mi
Dew point66°
Thu, 1386° / 70°0.1
86 °
Smithtown, Thursday, 13 August
Light rain. High 86°, low 70°.
Pressure29.74 inHg
Wind14.8 mph NW
Humidity67%
Visibility—
Dew point68°
Fri, 1478° / 68°0
78 °
Smithtown, Friday, 14 August
Overcast. High 78°, low 68°.
Pressure29.94 inHg
Wind11.5 mph NW
Humidity46%
Visibility—
Dew point49°
Sat, 1576° / 64°0
76 °
Smithtown, Saturday, 15 August
Clear. High 76°, low 64°.
Pressure30.15 inHg
Wind12.1 mph N
Humidity40%
Visibility—
Dew point45°
Sun, 1676° / 66°0
76 °
Smithtown, Sunday, 16 August
Partly cloudy. High 76°, low 66°.
Pressure30.30 inHg
Wind9.1 mph S
Humidity38%
Visibility—
Dew point45°
Mon, 1778° / 70°0
78 °
Smithtown, Monday, 17 August
Partly cloudy. High 78°, low 70°.
Pressure30.21 inHg
Wind12.5 mph S
Humidity48%
Visibility—
Dew point55°
Tue, 1879° / 73°0.26
79 °
Smithtown, Tuesday, 18 August
Light rain. High 79°, low 73°.
Pressure30.00 inHg
Wind16.1 mph SW
Humidity75%
Visibility—
Dew point68°
Wed, 1981° / 71°0.09
81 °
Smithtown, Wednesday, 19 August
Light rain. High 81°, low 71°.
Pressure29.85 inHg
Wind8.1 mph N
Humidity64%
Visibility—
Dew point63°
Thu, 2077° / 70°0.02
77 °
Smithtown, Thursday, 20 August
Light rain. High 77°, low 70°.
Pressure29.97 inHg
Wind9.2 mph N
Humidity72%
Visibility—
Dew point63°
Fri, 2175° / 68°1.12
75 °
Smithtown, Friday, 21 August
Heavy rain. High 75°, low 68°.
Pressure30.00 inHg
Wind11.9 mph S
Humidity69%
Visibility—
Dew point62°
Sat, 2276° / 70°0.65
76 °
Smithtown, Saturday, 22 August
Rain. High 76°, low 70°.
Pressure29.77 inHg
Wind13.3 mph SW
Humidity87%
Visibility—
Dew point68°
Sun, 2371° / 63°0
71 °
Smithtown, Sunday, 23 August
Mostly clear. High 71°, low 63°.
Pressure29.94 inHg
Wind19.6 mph NW
Humidity49%
Visibility—
Dew point45°
From day 17 onward the outlook is built from 60-year climate statistics
Mon, 2476° / 67°0.08
76 °
Smithtown, Monday, 24 August
Climate normal for this date — 60-year average.
Average high76°
Average low67°
Average precipitation0.08 in
Chance of precipitation23%
Record high89° (2021)
Record low56° (1971)
Tue, 2577° / 67°0.09
77 °
Smithtown, Tuesday, 25 August
Climate normal for this date — 60-year average.
Average high77°
Average low67°
Average precipitation0.09 in
Chance of precipitation23%
Record high91° (2020)
Record low58° (1963)
Wed, 2677° / 68°0.07
77 °
Smithtown, Wednesday, 26 August
Climate normal for this date — 60-year average.
Average high77°
Average low68°
Average precipitation0.07 in
Chance of precipitation23%
Record high89° (2021)
Record low61° (1960)
Thu, 2778° / 68°0.13
78 °
Smithtown, Thursday, 27 August
Climate normal for this date — 60-year average.
Average high78°
Average low68°
Average precipitation0.13 in
Chance of precipitation33%
Record high92° (2020)
Record low59° (2019)
Fri, 2877° / 68°0.19
77 °
Smithtown, Friday, 28 August
Climate normal for this date — 60-year average.
Average high77°
Average low68°
Average precipitation0.19 in
Chance of precipitation42%
Record high91° (2024)
Record low57° (2025)
Sat, 2976° / 68°0.14
76 °
Smithtown, Saturday, 29 August
Climate normal for this date — 60-year average.
Average high76°
Average low68°
Average precipitation0.14 in
Chance of precipitation32%
Record high89° (2018)
Record low53° (1982)
Sun, 3077° / 67°0.08
77 °
Smithtown, Sunday, 30 August
Climate normal for this date — 60-year average.
Average high77°
Average low67°
Average precipitation0.08 in
Chance of precipitation28%
Record high88° (2018)
Record low55° (1965)
Mon, 3176° / 67°0.05
76 °
Smithtown, Monday, 31 August
Climate normal for this date — 60-year average.
Average high76°
Average low67°
Average precipitation0.05 in
Chance of precipitation20%
Record high88° (2010)
Record low56° (1976)
Tue, 0175° / 67°0.07
75 °
Smithtown, Tuesday, 1 September
Climate normal for this date — 60-year average.
Average high75°
Average low67°
Average precipitation0.07 in
Chance of precipitation28%
Record high86° (1973)
Record low54° (2017)
Wed, 0275° / 66°0.15
75 °
Smithtown, Wednesday, 2 September
Climate normal for this date — 60-year average.
Average high75°
Average low66°
Average precipitation0.15 in
Chance of precipitation30%
Record high86° (1966)
Record low54° (2017)
Thu, 0376° / 66°0.11
76 °
Smithtown, Thursday, 3 September
Climate normal for this date — 60-year average.
Average high76°
Average low66°
Average precipitation0.11 in
Chance of precipitation30%
Record high87° (2023)
Record low56° (2024)
Fri, 0476° / 67°0.12
76 °
Smithtown, Friday, 4 September
Climate normal for this date — 60-year average.
Average high76°
Average low67°
Average precipitation0.12 in
Chance of precipitation25%
Record high90° (2018)
Record low55° (2024)
Sat, 0575° / 66°0.05
75 °
Smithtown, Saturday, 5 September
Climate normal for this date — 60-year average.
Average high75°
Average low66°
Average precipitation0.05 in
Chance of precipitation17%
Record high93° (2023)
Record low56° (2024)
Sun, 0675° / 66°0.17
75 °
Smithtown, Sunday, 6 September
Climate normal for this date — 60-year average.
Average high75°
Average low66°
Average precipitation0.17 in
Chance of precipitation38%
Record high92° (2023)
Record low56° (1962)
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 Smithtown, 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 Smithtown, 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.