Monthly outlook for Brattle, MA: average high 79.9°, average low 62.7°. That is 0.1° above the climate normal for August. Precipitation is expected on 7 days (about 4.0 inches), against a normal of 5 days and 1.8 inches. The warmest day looks like 9 August (94.5°), the coolest 16 August (55.8°).
79.9°/62.7°
Average high / low
+0.1°
Above normal
7 / 5
Wet days / normal
4.0 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
8 August – 17 August
83.4°
80.4°
+1.7°
18 August – 27 August
74°
78.5°
-2.5°
28 August – 6 September
at normal
76.8°
—
August records over 66 years
100°2 August 1975All-time high
46.9°31 August 1965All-time low
Climate normals and records are computed from the nearest reference point — Medford (3 mi).
Sun, 0995° / 72°0
95 °
Brattle, Sunday, 9 August
Clear. High 95°, low 72°.
Pressure29.88 inHg
Wind10.3 mph W
Humidity37%
Visibility6.2 mi
Dew point61°
Mon, 1091° / 70°0.06
91 °
Brattle, Monday, 10 August
Light rain. High 91°, low 70°.
Pressure29.94 inHg
Wind5.8 mph SW
Humidity32%
Visibility6.2 mi
Dew point56°
Tue, 1189° / 69°0
89 °
Brattle, Tuesday, 11 August
Mostly clear. High 89°, low 69°.
Pressure29.77 inHg
Wind12.1 mph NW
Humidity33%
Visibility6.2 mi
Dew point55°
Wed, 1271° / 62°0.33
71 °
Brattle, Wednesday, 12 August
Rain. High 71°, low 62°.
Pressure29.77 inHg
Wind5.5 mph NE
Humidity92%
Visibility6.2 mi
Dew point63°
Thu, 1379° / 60°0.26
79 °
Brattle, Thursday, 13 August
Light rain. High 79°, low 60°.
Pressure29.71 inHg
Wind12.1 mph NW
Humidity73%
Visibility—
Dew point65°
Fri, 1479° / 56°0
79 °
Brattle, Friday, 14 August
Overcast. High 79°, low 56°.
Pressure29.88 inHg
Wind8.6 mph W
Humidity40%
Visibility—
Dew point44°
Sat, 1577° / 57°0
77 °
Brattle, Saturday, 15 August
Clear. High 77°, low 57°.
Pressure30.09 inHg
Wind8.1 mph NW
Humidity38%
Visibility—
Dew point44°
Sun, 1680° / 56°0
80 °
Brattle, Sunday, 16 August
Clear. High 80°, low 56°.
Pressure30.27 inHg
Wind9.8 mph S
Humidity31%
Visibility—
Dew point41°
Mon, 1783° / 59°0
83 °
Brattle, Monday, 17 August
Overcast. High 83°, low 59°.
Pressure30.18 inHg
Wind9.1 mph SW
Humidity32%
Visibility—
Dew point44°
Tue, 1873° / 65°1.2
73 °
Brattle, Tuesday, 18 August
Heavy rain. High 73°, low 65°.
Pressure30.03 inHg
Wind9.8 mph S
Humidity99%
Visibility—
Dew point65°
Wed, 1976° / 63°0.02
76 °
Brattle, Wednesday, 19 August
Light rain. High 76°, low 63°.
Pressure29.85 inHg
Wind6 mph E
Humidity63%
Visibility—
Dew point61°
Thu, 2075° / 62°0
75 °
Brattle, Thursday, 20 August
Overcast. High 75°, low 62°.
Pressure30.00 inHg
Wind7.7 mph E
Humidity60%
Visibility—
Dew point57°
Fri, 2175° / 61°0.94
75 °
Brattle, Friday, 21 August
Heavy rain. High 75°, low 61°.
Pressure30.00 inHg
Wind11.3 mph S
Humidity59%
Visibility—
Dew point58°
Sat, 2274° / 63°1.07
74 °
Brattle, Saturday, 22 August
Heavy rain. High 74°, low 63°.
Pressure29.77 inHg
Wind8.9 mph S
Humidity96%
Visibility—
Dew point68°
Sun, 2371° / 57°0
71 °
Brattle, Sunday, 23 August
Clear. High 71°, low 57°.
Pressure29.77 inHg
Wind13.6 mph W
Humidity47%
Visibility—
Dew point44°
From day 17 onward the outlook is built from 60-year climate statistics
Mon, 2478° / 62°0.07
78 °
Brattle, Monday, 24 August
Climate normal for this date — 60-year average.
Average high78°
Average low62°
Average precipitation0.07 in
Chance of precipitation27%
Record high91° (1998)
Record low52° (1971)
Tue, 2578° / 62°0.11
78 °
Brattle, Tuesday, 25 August
Climate normal for this date — 60-year average.
Average high78°
Average low62°
Average precipitation0.11 in
Chance of precipitation28%
Record high95° (1969)
Record low53° (1971)
Wed, 2680° / 62°0.06
80 °
Brattle, Wednesday, 26 August
Climate normal for this date — 60-year average.
Average high80°
Average low62°
Average precipitation0.06 in
Chance of precipitation18%
Record high93° (1993)
Record low50° (1981)
Thu, 2779° / 64°0.09
79 °
Brattle, Thursday, 27 August
Climate normal for this date — 60-year average.
Average high79°
Average low64°
Average precipitation0.09 in
Chance of precipitation32%
Record high96° (1993)
Record low52° (1989)
Fri, 2878° / 64°0.11
78 °
Brattle, Friday, 28 August
Climate normal for this date — 60-year average.
Average high78°
Average low64°
Average precipitation0.11 in
Chance of precipitation28%
Record high96° (1993)
Record low53° (1986)
Sat, 2977° / 63°0.17
77 °
Brattle, Saturday, 29 August
Climate normal for this date — 60-year average.
Average high77°
Average low63°
Average precipitation0.17 in
Chance of precipitation30%
Record high95° (2018)
Record low48° (1986)
Sun, 3078° / 62°0.15
78 °
Brattle, Sunday, 30 August
Climate normal for this date — 60-year average.
Average high78°
Average low62°
Average precipitation0.15 in
Chance of precipitation23%
Record high93° (1973)
Record low48° (1986)
Mon, 3178° / 62°0.07
78 °
Brattle, Monday, 31 August
Climate normal for this date — 60-year average.
Average high78°
Average low62°
Average precipitation0.07 in
Chance of precipitation25%
Record high92° (2010)
Record low47° (1965)
Tue, 0176° / 61°0.05
76 °
Brattle, Tuesday, 1 September
Climate normal for this date — 60-year average.
Average high76°
Average low61°
Average precipitation0.05 in
Chance of precipitation23%
Record high93° (2010)
Record low50° (1975)
Wed, 0276° / 60°0.16
76 °
Brattle, Wednesday, 2 September
Climate normal for this date — 60-year average.
Average high76°
Average low60°
Average precipitation0.16 in
Chance of precipitation25%
Record high94° (2010)
Record low50° (2017)
Thu, 0376° / 61°0.13
76 °
Brattle, Thursday, 3 September
Climate normal for this date — 60-year average.
Average high76°
Average low61°
Average precipitation0.13 in
Chance of precipitation33%
Record high94° (2018)
Record low50° (1967)
Fri, 0476° / 61°0.12
76 °
Brattle, Friday, 4 September
Climate normal for this date — 60-year average.
Average high76°
Average low61°
Average precipitation0.12 in
Chance of precipitation22%
Record high90° (1973)
Record low51° (1987)
Sat, 0576° / 61°0.08
76 °
Brattle, Saturday, 5 September
Climate normal for this date — 60-year average.
Average high76°
Average low61°
Average precipitation0.08 in
Chance of precipitation17%
Record high90° (1971)
Record low51° (1994)
Sun, 0675° / 60°0.16
75 °
Brattle, Sunday, 6 September
Climate normal for this date — 60-year average.
Average high75°
Average low60°
Average precipitation0.16 in
Chance of precipitation33%
Record high95° (2018)
Record low50° (1965)
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 Brattle, 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 Brattle, 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.