Monthly outlook for Hillsborough, NJ: average high 83.1°, average low 63.1°. That is 0.3° above the climate normal for August. Precipitation is expected on 4 days (about 0.5 inches), against a normal of 5 days and 2.3 inches. The warmest day looks like 11 August (89.7°), the coolest 15 August (55°).
83.1°/63.1°
Average high / low
+0.3°
Above normal
4 / 5
Wet days / normal
0.5 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
9 August – 18 August
82.1°
83.3°
-0.7°
19 August – 28 August
84.7°
81.7°
+1.7°
29 August – 7 September
at normal
80.3°
—
August records over 66 years
101.1°9 August 2001All-time high
47.3°30 August 1986All-time low
Climate normals and records are computed from the nearest reference point — Franklin Park (8 mi).
Mon, 1088° / 71°0.01
88 °
Hillsborough, Monday, 10 August
Light rain. High 88°, low 71°.
Pressure29.97 inHg
Wind6.9 mph W
Humidity45%
Visibility6.2 mi
Dew point63°
Tue, 1190° / 71°0
90 °
Hillsborough, Tuesday, 11 August
Light rain. High 90°, low 71°.
Pressure29.85 inHg
Wind9.1 mph NW
Humidity55%
Visibility6.2 mi
Dew point67°
Wed, 1286° / 65°0.03
86 °
Hillsborough, Wednesday, 12 August
Light rain. High 86°, low 65°.
Pressure29.83 inHg
Wind4 mph SW
Humidity53%
Visibility6.2 mi
Dew point61°
Thu, 1384° / 65°0.07
84 °
Hillsborough, Thursday, 13 August
Light rain. High 84°, low 65°.
Pressure29.77 inHg
Wind15.7 mph W
Humidity50%
Visibility6.2 mi
Dew point63°
Fri, 1478° / 60°0
78 °
Hillsborough, Friday, 14 August
Overcast. High 78°, low 60°.
Pressure30.00 inHg
Wind9.2 mph NW
Humidity35%
Visibility—
Dew point46°
Sat, 1578° / 55°0
78 °
Hillsborough, Saturday, 15 August
Clear. High 78°, low 55°.
Pressure30.15 inHg
Wind13.2 mph N
Humidity34%
Visibility—
Dew point44°
Sun, 1677° / 56°0
77 °
Hillsborough, Sunday, 16 August
Overcast. High 77°, low 56°.
Pressure30.15 inHg
Wind5.5 mph W
Humidity37%
Visibility—
Dew point47°
Mon, 1768° / 62°0.09
68 °
Hillsborough, Monday, 17 August
Light rain. High 68°, low 62°.
Pressure29.91 inHg
Wind8.5 mph NW
Humidity96%
Visibility—
Dew point66°
Tue, 1883° / 58°0
83 °
Hillsborough, Tuesday, 18 August
Overcast. High 83°, low 58°.
Pressure29.94 inHg
Wind6.3 mph N
Humidity36%
Visibility—
Dew point50°
Wed, 1986° / 62°0.03
86 °
Hillsborough, Wednesday, 19 August
Light rain. High 86°, low 62°.
Pressure29.85 inHg
Wind12.1 mph SE
Humidity38%
Visibility—
Dew point55°
Thu, 2084° / 65°0.03
84 °
Hillsborough, Thursday, 20 August
Light rain. High 84°, low 65°.
Pressure29.71 inHg
Wind9.9 mph N
Humidity55%
Visibility—
Dew point64°
Fri, 2183° / 57°0
83 °
Hillsborough, Friday, 21 August
Mostly clear. High 83°, low 57°.
Pressure29.85 inHg
Wind6.7 mph W
Humidity35%
Visibility—
Dew point49°
Sat, 2289° / 61°0
89 °
Hillsborough, Saturday, 22 August
Clear. High 89°, low 61°.
Pressure29.91 inHg
Wind12.7 mph S
Humidity35%
Visibility—
Dew point55°
Sun, 2386° / 70°0.2
86 °
Hillsborough, Sunday, 23 August
Rain. High 86°, low 70°.
Pressure29.85 inHg
Wind17.9 mph W
Humidity39%
Visibility—
Dew point57°
Mon, 2480° / 59°0
80 °
Hillsborough, Monday, 24 August
Clear. High 80°, low 59°.
Pressure30.15 inHg
Wind7.4 mph NW
Humidity31%
Visibility—
Dew point44°
From day 17 onward the outlook is built from 60-year climate statistics
Tue, 2582° / 65°0.07
82 °
Hillsborough, Tuesday, 25 August
Climate normal for this date — 60-year average.
Average high82°
Average low65°
Average precipitation0.07 in
Chance of precipitation22%
Record high97° (1968)
Record low53° (1971)
Wed, 2683° / 65°0.08
83 °
Hillsborough, Wednesday, 26 August
Climate normal for this date — 60-year average.
Average high83°
Average low65°
Average precipitation0.08 in
Chance of precipitation25%
Record high93° (1993)
Record low56° (1960)
Thu, 2783° / 66°0.15
83 °
Hillsborough, Thursday, 27 August
Climate normal for this date — 60-year average.
Average high83°
Average low66°
Average precipitation0.15 in
Chance of precipitation33%
Record high94° (2020)
Record low57° (2017)
Fri, 2882° / 67°0.22
82 °
Hillsborough, Friday, 28 August
Climate normal for this date — 60-year average.
Average high82°
Average low67°
Average precipitation0.22 in
Chance of precipitation42%
Record high96° (1973)
Record low56° (2025)
Sat, 2981° / 66°0.12
81 °
Hillsborough, Saturday, 29 August
Climate normal for this date — 60-year average.
Average high81°
Average low66°
Average precipitation0.12 in
Chance of precipitation30%
Record high94° (2010)
Record low49° (1986)
Sun, 3082° / 65°0.07
82 °
Hillsborough, Sunday, 30 August
Climate normal for this date — 60-year average.
Average high82°
Average low65°
Average precipitation0.07 in
Chance of precipitation27%
Record high96° (1973)
Record low47° (1986)
Mon, 3182° / 65°0.07
82 °
Hillsborough, Monday, 31 August
Climate normal for this date — 60-year average.
Average high82°
Average low65°
Average precipitation0.07 in
Chance of precipitation18%
Record high95° (1973)
Record low51° (1976)
Tue, 0180° / 64°0.13
80 °
Hillsborough, Tuesday, 1 September
Climate normal for this date — 60-year average.
Average high80°
Average low64°
Average precipitation0.13 in
Chance of precipitation32%
Record high94° (2010)
Record low54° (2017)
Wed, 0280° / 64°0.15
80 °
Hillsborough, Wednesday, 2 September
Climate normal for this date — 60-year average.
Average high80°
Average low64°
Average precipitation0.15 in
Chance of precipitation33%
Record high96° (1980)
Record low52° (2017)
Thu, 0380° / 64°0.13
80 °
Hillsborough, Thursday, 3 September
Climate normal for this date — 60-year average.
Average high80°
Average low64°
Average precipitation0.13 in
Chance of precipitation35%
Record high92° (1993)
Record low49° (1967)
Fri, 0480° / 64°0.09
80 °
Hillsborough, Friday, 4 September
Climate normal for this date — 60-year average.
Average high80°
Average low64°
Average precipitation0.09 in
Chance of precipitation25%
Record high94° (2023)
Record low53° (1997)
Sat, 0580° / 64°0.06
80 °
Hillsborough, Saturday, 5 September
Climate normal for this date — 60-year average.
Average high80°
Average low64°
Average precipitation0.06 in
Chance of precipitation18%
Record high96° (2023)
Record low53° (1997)
Sun, 0679° / 63°0.2
79 °
Hillsborough, Sunday, 6 September
Climate normal for this date — 60-year average.
Average high79°
Average low63°
Average precipitation0.2 in
Chance of precipitation33%
Record high96° (2023)
Record low51° (1984)
Mon, 0780° / 63°0.11
80 °
Hillsborough, Monday, 7 September
Climate normal for this date — 60-year average.
Average high80°
Average low63°
Average precipitation0.11 in
Chance of precipitation32%
Record high94° (2023)
Record low49° (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 Hillsborough, NJ 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 Hillsborough, NJ 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.