Monthly outlook for South Lincoln, MA: average high 82°, average low 61.4°. That is 1.5° above the climate normal for August. Precipitation is expected on 4 days (about 0.6 inches), against a normal of 5 days and 1.7 inches. The warmest day looks like 24 August (90.2°), the coolest 15 August (54.2°).
82°/61.4°
Average high / low
+1.5°
Above normal
4 / 5
Wet days / normal
0.6 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
9 August – 18 August
80.9°
80.2°
+0.4°
19 August – 28 August
83.9°
78.3°
+3.1°
29 August – 7 September
at normal
76.4°
—
August records over 66 years
100°2 August 1975All-time high
46.2°31 August 1965All-time low
Climate normals and records are computed from the nearest reference point — Belmont (8 mi).
Mon, 1089° / 67°0.07
89 °
South Lincoln, Monday, 10 August
Light rain. High 89°, low 67°.
Pressure29.94 inHg
Wind6.6 mph SW
Humidity35%
Visibility6.2 mi
Dew point56°
Tue, 1187° / 67°0
87 °
South Lincoln, Tuesday, 11 August
Partly cloudy. High 87°, low 67°.
Pressure29.77 inHg
Wind10 mph NW
Humidity36%
Visibility6.2 mi
Dew point55°
Wed, 1274° / 63°0.06
74 °
South Lincoln, Wednesday, 12 August
Light rain. High 74°, low 63°.
Pressure29.80 inHg
Wind3.9 mph N
Humidity59%
Visibility6.2 mi
Dew point57°
Thu, 1384° / 59°0
84 °
South Lincoln, Thursday, 13 August
Partly cloudy. High 84°, low 59°.
Pressure29.74 inHg
Wind10.2 mph NW
Humidity40%
Visibility6.2 mi
Dew point55°
Fri, 1476° / 56°0
76 °
South Lincoln, Friday, 14 August
Overcast. High 76°, low 56°.
Pressure30.03 inHg
Wind11.9 mph NW
Humidity36%
Visibility—
Dew point41°
Sat, 1578° / 54°0
78 °
South Lincoln, Saturday, 15 August
Partly cloudy. High 78°, low 54°.
Pressure30.18 inHg
Wind6.3 mph NW
Humidity38%
Visibility—
Dew point43°
Sun, 1673° / 57°0.3
73 °
South Lincoln, Sunday, 16 August
Rain. High 73°, low 57°.
Pressure30.00 inHg
Wind15.5 mph S
Humidity73%
Visibility—
Dew point60°
Mon, 1776° / 61°0.08
76 °
South Lincoln, Monday, 17 August
Light rain. High 76°, low 61°.
Pressure29.83 inHg
Wind13.3 mph NW
Humidity64%
Visibility—
Dew point55°
Tue, 1884° / 59°0
84 °
South Lincoln, Tuesday, 18 August
Partly cloudy. High 84°, low 59°.
Pressure30.09 inHg
Wind7.6 mph S
Humidity42%
Visibility—
Dew point51°
Wed, 1983° / 68°0.04
83 °
South Lincoln, Wednesday, 19 August
Light rain. High 83°, low 68°.
Pressure29.85 inHg
Wind11.7 mph W
Humidity93%
Visibility—
Dew point68°
Thu, 2083° / 58°0
83 °
South Lincoln, Thursday, 20 August
Mostly clear. High 83°, low 58°.
Pressure29.94 inHg
Wind6.8 mph NW
Humidity43%
Visibility—
Dew point49°
Fri, 2183° / 65°0.04
83 °
South Lincoln, Friday, 21 August
Light rain. High 83°, low 65°.
Pressure29.77 inHg
Wind12.8 mph SW
Humidity75%
Visibility—
Dew point63°
Sat, 2278° / 60°0
78 °
South Lincoln, Saturday, 22 August
Overcast. High 78°, low 60°.
Pressure29.94 inHg
Wind7.4 mph E
Humidity61%
Visibility—
Dew point57°
Sun, 2385° / 58°0
85 °
South Lincoln, Sunday, 23 August
Clear. High 85°, low 58°.
Pressure30.06 inHg
Wind9 mph S
Humidity47%
Visibility—
Dew point54°
Mon, 2490° / 61°0.01
90 °
South Lincoln, Monday, 24 August
Light rain. High 90°, low 61°.
Pressure29.94 inHg
Wind10.3 mph W
Humidity49%
Visibility—
Dew point59°
From day 17 onward the outlook is built from 60-year climate statistics
Tue, 2578° / 62°0.11
78 °
South Lincoln, Tuesday, 25 August
Climate normal for this date — 60-year average.
Average high78°
Average low62°
Average precipitation0.11 in
Chance of precipitation25%
Record high94° (2007)
Record low52° (1971)
Wed, 2680° / 62°0.06
80 °
South Lincoln, Wednesday, 26 August
Climate normal for this date — 60-year average.
Average high80°
Average low62°
Average precipitation0.06 in
Chance of precipitation17%
Record high94° (2021)
Record low51° (1981)
Thu, 2779° / 63°0.09
79 °
South Lincoln, Thursday, 27 August
Climate normal for this date — 60-year average.
Average high79°
Average low63°
Average precipitation0.09 in
Chance of precipitation35%
Record high96° (1993)
Record low52° (1989)
Fri, 2878° / 63°0.12
78 °
South Lincoln, Friday, 28 August
Climate normal for this date — 60-year average.
Average high78°
Average low63°
Average precipitation0.12 in
Chance of precipitation30%
Record high94° (1993)
Record low53° (1986)
Sat, 2977° / 63°0.17
77 °
South Lincoln, Saturday, 29 August
Climate normal for this date — 60-year average.
Average high77°
Average low63°
Average precipitation0.17 in
Chance of precipitation30%
Record high94° (2018)
Record low48° (1986)
Sun, 3078° / 62°0.13
78 °
South Lincoln, Sunday, 30 August
Climate normal for this date — 60-year average.
Average high78°
Average low62°
Average precipitation0.13 in
Chance of precipitation25%
Record high92° (1973)
Record low48° (1965)
Mon, 3178° / 61°0.08
78 °
South Lincoln, Monday, 31 August
Climate normal for this date — 60-year average.
Average high78°
Average low61°
Average precipitation0.08 in
Chance of precipitation25%
Record high92° (1973)
Record low46° (1965)
Tue, 0176° / 61°0.06
76 °
South Lincoln, Tuesday, 1 September
Climate normal for this date — 60-year average.
Average high76°
Average low61°
Average precipitation0.06 in
Chance of precipitation23%
Record high93° (2010)
Record low50° (1975)
Wed, 0276° / 60°0.15
76 °
South Lincoln, Wednesday, 2 September
Climate normal for this date — 60-year average.
Average high76°
Average low60°
Average precipitation0.15 in
Chance of precipitation25%
Record high94° (2010)
Record low48° (2017)
Thu, 0376° / 60°0.12
76 °
South Lincoln, Thursday, 3 September
Climate normal for this date — 60-year average.
Average high76°
Average low60°
Average precipitation0.12 in
Chance of precipitation32%
Record high93° (2018)
Record low50° (1967)
Fri, 0476° / 60°0.11
76 °
South Lincoln, Friday, 4 September
Climate normal for this date — 60-year average.
Average high76°
Average low60°
Average precipitation0.11 in
Chance of precipitation23%
Record high90° (1973)
Record low50° (1987)
Sat, 0576° / 60°0.07
76 °
South Lincoln, Saturday, 5 September
Climate normal for this date — 60-year average.
Average high76°
Average low60°
Average precipitation0.07 in
Chance of precipitation17%
Record high93° (2018)
Record low50° (1994)
Sun, 0675° / 60°0.15
75 °
South Lincoln, Sunday, 6 September
Climate normal for this date — 60-year average.
Average high75°
Average low60°
Average precipitation0.15 in
Chance of precipitation32%
Record high94° (2018)
Record low50° (2000)
Mon, 0776° / 59°0.11
76 °
South Lincoln, Monday, 7 September
Climate normal for this date — 60-year average.
Average high76°
Average low59°
Average precipitation0.11 in
Chance of precipitation25%
Record high93° (2023)
Record low47° (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 South Lincoln, MA 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 South Lincoln, MA 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.