Monthly outlook for Groveville, NJ: average high 89.1°, average low 67.3°. That is 3.8° above the climate normal for August. Precipitation is expected on 5 days (about 0.5 inches), against a normal of 6 days and 2.3 inches. The warmest day looks like 23 August (99.3°), the coolest 16 August (57.2°).
89.1°/67.3°
Average high / low
+3.8°
Above normal
5 / 6
Wet days / normal
0.5 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
9 August – 18 August
85.4°
83.1°
+1.3°
19 August – 28 August
95.2°
81.5°
+7.6°
29 August – 7 September
at normal
80.2°
—
August records over 66 years
100.6°9 August 2001All-time high
46.6°30 August 1986All-time low
Climate normals and records are computed from the nearest reference point — Twin Rivers (11 mi).
Mon, 1090° / 71°0
90 °
Groveville, Monday, 10 August
Light rain. High 90°, low 71°.
Pressure29.97 inHg
Wind7.3 mph W
Humidity35%
Visibility6.2 mi
Dew point60°
Tue, 1191° / 71°0.07
91 °
Groveville, Tuesday, 11 August
Rain. High 91°, low 71°.
Pressure29.85 inHg
Wind10.7 mph NW
Humidity46%
Visibility6.2 mi
Dew point63°
Wed, 1286° / 72°0
86 °
Groveville, Wednesday, 12 August
Overcast. High 86°, low 72°.
Pressure29.74 inHg
Wind10.9 mph W
Humidity50%
Visibility6.2 mi
Dew point65°
Thu, 1387° / 68°0.08
87 °
Groveville, Thursday, 13 August
Light rain. High 87°, low 68°.
Pressure29.74 inHg
Wind15.9 mph NW
Humidity37%
Visibility—
Dew point55°
Fri, 1479° / 60°0
79 °
Groveville, Friday, 14 August
Partly cloudy. High 79°, low 60°.
Pressure30.00 inHg
Wind14.1 mph NW
Humidity32%
Visibility—
Dew point44°
Sat, 1580° / 58°0
80 °
Groveville, Saturday, 15 August
Clear. High 80°, low 58°.
Pressure30.09 inHg
Wind14 mph NW
Humidity30%
Visibility—
Dew point42°
Sun, 1682° / 57°0
82 °
Groveville, Sunday, 16 August
Overcast. High 82°, low 57°.
Pressure30.12 inHg
Wind8.1 mph NW
Humidity25%
Visibility—
Dew point40°
Mon, 1783° / 61°0
83 °
Groveville, Monday, 17 August
Overcast. High 83°, low 61°.
Pressure29.97 inHg
Wind9.6 mph SW
Humidity30%
Visibility—
Dew point46°
Tue, 1889° / 64°0
89 °
Groveville, Tuesday, 18 August
Mostly clear. High 89°, low 64°.
Pressure30.00 inHg
Wind11 mph SE
Humidity33%
Visibility—
Dew point53°
Wed, 1989° / 67°0
89 °
Groveville, Wednesday, 19 August
Overcast. High 89°, low 67°.
Pressure30.06 inHg
Wind10.1 mph E
Humidity32%
Visibility—
Dew point53°
Thu, 2094° / 66°0
94 °
Groveville, Thursday, 20 August
Clear. High 94°, low 66°.
Pressure30.00 inHg
Wind9.2 mph SE
Humidity30%
Visibility—
Dew point55°
Fri, 2196° / 70°0.1
96 °
Groveville, Friday, 21 August
Light rain. High 96°, low 70°.
Pressure29.85 inHg
Wind13.6 mph SW
Humidity37%
Visibility—
Dew point63°
Sat, 2297° / 72°0.05
97 °
Groveville, Saturday, 22 August
Light rain. High 97°, low 72°.
Pressure29.85 inHg
Wind10.1 mph NW
Humidity40%
Visibility—
Dew point65°
Sun, 2399° / 71°0
99 °
Groveville, Sunday, 23 August
Clear. High 99°, low 71°.
Pressure29.91 inHg
Wind7.1 mph W
Humidity25%
Visibility—
Dew point54°
Mon, 2496° / 75°0.17
96 °
Groveville, Monday, 24 August
Light rain. High 96°, low 75°.
Pressure29.91 inHg
Wind6.3 mph E
Humidity45%
Visibility—
Dew point69°
From day 17 onward the outlook is built from 60-year climate statistics
Tue, 2582° / 64°0.07
82 °
Groveville, Tuesday, 25 August
Climate normal for this date — 60-year average.
Average high82°
Average low64°
Average precipitation0.07 in
Chance of precipitation22%
Record high96° (1968)
Record low52° (1971)
Wed, 2682° / 65°0.07
82 °
Groveville, Wednesday, 26 August
Climate normal for this date — 60-year average.
Average high82°
Average low65°
Average precipitation0.07 in
Chance of precipitation23%
Record high92° (1993)
Record low54° (1960)
Thu, 2783° / 66°0.15
83 °
Groveville, Thursday, 27 August
Climate normal for this date — 60-year average.
Average high83°
Average low66°
Average precipitation0.15 in
Chance of precipitation37%
Record high92° (2021)
Record low56° (1963)
Fri, 2882° / 67°0.2
82 °
Groveville, Friday, 28 August
Climate normal for this date — 60-year average.
Average high82°
Average low67°
Average precipitation0.2 in
Chance of precipitation43%
Record high96° (1973)
Record low53° (2025)
Sat, 2981° / 66°0.11
81 °
Groveville, Saturday, 29 August
Climate normal for this date — 60-year average.
Average high81°
Average low66°
Average precipitation0.11 in
Chance of precipitation28%
Record high93° (2010)
Record low48° (1986)
Sun, 3082° / 65°0.08
82 °
Groveville, Sunday, 30 August
Climate normal for this date — 60-year average.
Average high82°
Average low65°
Average precipitation0.08 in
Chance of precipitation28%
Record high95° (1973)
Record low47° (1986)
Mon, 3181° / 65°0.09
81 °
Groveville, Monday, 31 August
Climate normal for this date — 60-year average.
Average high81°
Average low65°
Average precipitation0.09 in
Chance of precipitation20%
Record high95° (1973)
Record low49° (1976)
Tue, 0180° / 64°0.12
80 °
Groveville, Tuesday, 1 September
Climate normal for this date — 60-year average.
Average high80°
Average low64°
Average precipitation0.12 in
Chance of precipitation33%
Record high94° (2010)
Record low55° (2017)
Wed, 0280° / 63°0.13
80 °
Groveville, Wednesday, 2 September
Climate normal for this date — 60-year average.
Average high80°
Average low63°
Average precipitation0.13 in
Chance of precipitation35%
Record high96° (1980)
Record low52° (1970)
Thu, 0380° / 64°0.1
80 °
Groveville, Thursday, 3 September
Climate normal for this date — 60-year average.
Average high80°
Average low64°
Average precipitation0.1 in
Chance of precipitation32%
Record high92° (1993)
Record low48° (1967)
Fri, 0480° / 64°0.08
80 °
Groveville, Friday, 4 September
Climate normal for this date — 60-year average.
Average high80°
Average low64°
Average precipitation0.08 in
Chance of precipitation32%
Record high92° (2008)
Record low51° (2024)
Sat, 0580° / 64°0.07
80 °
Groveville, Saturday, 5 September
Climate normal for this date — 60-year average.
Average high80°
Average low64°
Average precipitation0.07 in
Chance of precipitation23%
Record high94° (2023)
Record low52° (1997)
Sun, 0679° / 63°0.18
79 °
Groveville, Sunday, 6 September
Climate normal for this date — 60-year average.
Average high79°
Average low63°
Average precipitation0.18 in
Chance of precipitation37%
Record high94° (2023)
Record low51° (1984)
Mon, 0780° / 62°0.09
80 °
Groveville, Monday, 7 September
Climate normal for this date — 60-year average.
Average high80°
Average low62°
Average precipitation0.09 in
Chance of precipitation27%
Record high92° (2023)
Record low48° (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 Groveville, 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 Groveville, 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.