Monthly outlook for Somerville, NJ: average high 82.9°, average low 65.3°. That is 0.3° above the climate normal for August. Precipitation is expected on 6 days (about 2.7 inches), against a normal of 6 days and 2.4 inches. The warmest day looks like 11 August (91.1°), the coolest 15 August (56.5°).
82.9°/65.3°
Average high / low
+0.3°
Above normal
6 / 6
Wet days / normal
2.7 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
8 August – 17 August
84.9°
83.2°
+0.9°
18 August – 27 August
79.6°
81.3°
-1°
28 August – 6 September
at normal
80.2°
—
August records over 66 years
101.1°9 August 2001All-time high
50.2°30 August 1986All-time low
Climate normals and records are computed from the nearest reference point — Iselin (15 mi).
Sun, 0990° / 73°0.01
90 °
Somerville, Sunday, 9 August
Light rain. High 90°, low 73°.
Pressure29.97 inHg
Wind7.9 mph W
Humidity47%
Visibility6.2 mi
Dew point66°
Mon, 1089° / 73°0.07
89 °
Somerville, Monday, 10 August
Light rain. High 89°, low 73°.
Pressure30.00 inHg
Wind6 mph W
Humidity53%
Visibility6.2 mi
Dew point65°
Tue, 1191° / 71°0.06
91 °
Somerville, Tuesday, 11 August
Light rain. High 91°, low 71°.
Pressure29.88 inHg
Wind5.7 mph NW
Humidity44%
Visibility6.2 mi
Dew point62°
Wed, 1285° / 71°0.19
85 °
Somerville, Wednesday, 12 August
Rain. High 85°, low 71°.
Pressure29.77 inHg
Wind9 mph W
Humidity56%
Visibility6.2 mi
Dew point66°
Thu, 1387° / 66°0
87 °
Somerville, Thursday, 13 August
Overcast. High 87°, low 66°.
Pressure29.74 inHg
Wind13 mph NW
Humidity43%
Visibility—
Dew point60°
Fri, 1478° / 63°0
78 °
Somerville, Friday, 14 August
Partly cloudy. High 78°, low 63°.
Pressure29.94 inHg
Wind10.2 mph N
Humidity33%
Visibility—
Dew point45°
Sat, 1577° / 56°0
77 °
Somerville, Saturday, 15 August
Clear. High 77°, low 56°.
Pressure30.15 inHg
Wind11.5 mph NW
Humidity33%
Visibility—
Dew point44°
Sun, 1680° / 57°0
80 °
Somerville, Sunday, 16 August
Clear. High 80°, low 57°.
Pressure30.27 inHg
Wind6.4 mph NW
Humidity30%
Visibility—
Dew point44°
Mon, 1784° / 59°0
84 °
Somerville, Monday, 17 August
Partly cloudy. High 84°, low 59°.
Pressure30.15 inHg
Wind9.8 mph SW
Humidity34%
Visibility—
Dew point50°
Tue, 1879° / 67°0.07
79 °
Somerville, Tuesday, 18 August
Light rain. High 79°, low 67°.
Pressure29.94 inHg
Wind11.5 mph SW
Humidity71%
Visibility—
Dew point66°
Wed, 1986° / 67°0.01
86 °
Somerville, Wednesday, 19 August
Light rain. High 86°, low 67°.
Pressure29.85 inHg
Wind9 mph NW
Humidity38%
Visibility—
Dew point55°
Thu, 2082° / 63°0
82 °
Somerville, Thursday, 20 August
Overcast. High 82°, low 63°.
Pressure29.97 inHg
Wind5.6 mph W
Humidity45%
Visibility—
Dew point56°
Fri, 2175° / 64°2.16
75 °
Somerville, Friday, 21 August
Heavy rain. High 75°, low 64°.
Pressure29.91 inHg
Wind7.5 mph S
Humidity88%
Visibility—
Dew point66°
Sat, 2282° / 67°0.17
82 °
Somerville, Saturday, 22 August
Light rain. High 82°, low 67°.
Pressure29.74 inHg
Wind6.4 mph N
Humidity58%
Visibility—
Dew point64°
Sun, 2372° / 57°0
72 °
Somerville, Sunday, 23 August
Clear. High 72°, low 57°.
Pressure30.00 inHg
Wind14.1 mph NW
Humidity39%
Visibility—
Dew point43°
From day 17 onward the outlook is built from 60-year climate statistics
Mon, 2481° / 65°0.06
81 °
Somerville, Monday, 24 August
Climate normal for this date — 60-year average.
Average high81°
Average low65°
Average precipitation0.06 in
Chance of precipitation23%
Record high93° (1998)
Record low54° (1971)
Tue, 2582° / 65°0.07
82 °
Somerville, Tuesday, 25 August
Climate normal for this date — 60-year average.
Average high82°
Average low65°
Average precipitation0.07 in
Chance of precipitation17%
Record high96° (1968)
Record low55° (1971)
Wed, 2682° / 65°0.09
82 °
Somerville, Wednesday, 26 August
Climate normal for this date — 60-year average.
Average high82°
Average low65°
Average precipitation0.09 in
Chance of precipitation23%
Record high92° (1993)
Record low56° (1963)
Thu, 2782° / 67°0.15
82 °
Somerville, Thursday, 27 August
Climate normal for this date — 60-year average.
Average high82°
Average low67°
Average precipitation0.15 in
Chance of precipitation35%
Record high93° (1980)
Record low58° (1969)
Fri, 2882° / 67°0.2
82 °
Somerville, 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 low57° (2025)
Sat, 2981° / 67°0.14
81 °
Somerville, Saturday, 29 August
Climate normal for this date — 60-year average.
Average high81°
Average low67°
Average precipitation0.14 in
Chance of precipitation32%
Record high93° (2010)
Record low50° (1982)
Sun, 3082° / 66°0.06
82 °
Somerville, Sunday, 30 August
Climate normal for this date — 60-year average.
Average high82°
Average low66°
Average precipitation0.06 in
Chance of precipitation25%
Record high95° (1973)
Record low50° (1986)
Mon, 3181° / 65°0.07
81 °
Somerville, Monday, 31 August
Climate normal for this date — 60-year average.
Average high81°
Average low65°
Average precipitation0.07 in
Chance of precipitation17%
Record high95° (2010)
Record low52° (1976)
Tue, 0179° / 65°0.13
79 °
Somerville, Tuesday, 1 September
Climate normal for this date — 60-year average.
Average high79°
Average low65°
Average precipitation0.13 in
Chance of precipitation30%
Record high95° (2010)
Record low54° (2017)
Wed, 0279° / 64°0.17
79 °
Somerville, Wednesday, 2 September
Climate normal for this date — 60-year average.
Average high79°
Average low64°
Average precipitation0.17 in
Chance of precipitation32%
Record high96° (1980)
Record low52° (2017)
Thu, 0380° / 64°0.13
80 °
Somerville, Thursday, 3 September
Climate normal for this date — 60-year average.
Average high80°
Average low64°
Average precipitation0.13 in
Chance of precipitation32%
Record high92° (1993)
Record low51° (1967)
Fri, 0480° / 65°0.09
80 °
Somerville, Friday, 4 September
Climate normal for this date — 60-year average.
Average high80°
Average low65°
Average precipitation0.09 in
Chance of precipitation30%
Record high93° (2023)
Record low53° (2024)
Sat, 0579° / 64°0.06
79 °
Somerville, Saturday, 5 September
Climate normal for this date — 60-year average.
Average high79°
Average low64°
Average precipitation0.06 in
Chance of precipitation20%
Record high96° (2023)
Record low54° (1997)
Sun, 0679° / 64°0.18
79 °
Somerville, Sunday, 6 September
Climate normal for this date — 60-year average.
Average high79°
Average low64°
Average precipitation0.18 in
Chance of precipitation32%
Record high95° (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 Somerville, 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 Somerville, 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.