Monthly outlook for Glenallen, MA: average high 79.9°, average low 59.2°. That is 1.6° above the climate normal for August. Precipitation is expected on 2 days (about 0.3 inches), against a normal of 5 days and 2.0 inches. The warmest day looks like 21 August (87.5°), the coolest 15 August (50.4°).
79.9°/59.2°
Average high / low
+1.6°
Above normal
2 / 5
Wet days / normal
0.3 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
9 August – 18 August
77.9°
77.8°
+0.1°
19 August – 28 August
83.2°
75.9°
+4°
29 August – 7 September
at normal
74°
—
August records over 66 years
98.1°2 August 1975All-time high
41°31 August 1965All-time low
Climate normals and records are computed from the nearest reference point — Gardner (7 mi).
Mon, 1085° / 64°0.07
85 °
Glenallen, Monday, 10 August
Rain. High 85°, low 64°.
Pressure29.97 inHg
Wind7.4 mph SW
Humidity35%
Visibility6.2 mi
Dew point53°
Tue, 1183° / 63°0.02
83 °
Glenallen, Tuesday, 11 August
Light rain. High 83°, low 63°.
Pressure29.77 inHg
Wind9.9 mph NW
Humidity45%
Visibility6.2 mi
Dew point57°
Wed, 1275° / 60°0
75 °
Glenallen, Wednesday, 12 August
Overcast. High 75°, low 60°.
Pressure29.77 inHg
Wind2.3 mph E
Humidity47%
Visibility6.2 mi
Dew point55°
Thu, 1376° / 58°0.02
76 °
Glenallen, Thursday, 13 August
Light rain. High 76°, low 58°.
Pressure29.68 inHg
Wind14.1 mph W
Humidity63%
Visibility—
Dew point56°
Fri, 1469° / 52°0
69 °
Glenallen, Friday, 14 August
Clear. High 69°, low 52°.
Pressure29.88 inHg
Wind17 mph NW
Humidity43%
Visibility—
Dew point41°
Sat, 1573° / 50°0
73 °
Glenallen, Saturday, 15 August
Clear. High 73°, low 50°.
Pressure29.94 inHg
Wind15.1 mph NW
Humidity43%
Visibility—
Dew point42°
Sun, 1676° / 52°0
76 °
Glenallen, Sunday, 16 August
Overcast. High 76°, low 52°.
Pressure30.09 inHg
Wind8.7 mph NW
Humidity37%
Visibility—
Dew point42°
Mon, 1778° / 57°0.03
78 °
Glenallen, Monday, 17 August
Light rain. High 78°, low 57°.
Pressure30.03 inHg
Wind7.3 mph NW
Humidity41%
Visibility—
Dew point47°
Tue, 1878° / 54°0
78 °
Glenallen, Tuesday, 18 August
Clear. High 78°, low 54°.
Pressure30.03 inHg
Wind6.6 mph NW
Humidity52%
Visibility—
Dew point51°
Wed, 1978° / 57°0
78 °
Glenallen, Wednesday, 19 August
Overcast. High 78°, low 57°.
Pressure30.15 inHg
Wind4.1 mph N
Humidity50%
Visibility—
Dew point52°
Thu, 2085° / 60°0
85 °
Glenallen, Thursday, 20 August
Overcast. High 85°, low 60°.
Pressure30.06 inHg
Wind8.8 mph SW
Humidity46%
Visibility—
Dew point55°
Fri, 2188° / 67°0.11
88 °
Glenallen, Friday, 21 August
Light rain. High 88°, low 67°.
Pressure29.88 inHg
Wind12.2 mph SW
Humidity60%
Visibility—
Dew point63°
Sat, 2287° / 67°0
87 °
Glenallen, Saturday, 22 August
Overcast. High 87°, low 67°.
Pressure29.88 inHg
Wind7.2 mph SW
Humidity66%
Visibility—
Dew point66°
Sun, 2387° / 62°0
87 °
Glenallen, Sunday, 23 August
Clear. High 87°, low 62°.
Pressure29.94 inHg
Wind4.9 mph NW
Humidity39%
Visibility—
Dew point51°
Mon, 2474° / 60°0.02
74 °
Glenallen, Monday, 24 August
Light rain. High 74°, low 60°.
Pressure30.06 inHg
Wind9.7 mph NE
Humidity76%
Visibility—
Dew point62°
From day 17 onward the outlook is built from 60-year climate statistics
Tue, 2576° / 59°0.1
76 °
Glenallen, Tuesday, 25 August
Climate normal for this date — 60-year average.
Average high76°
Average low59°
Average precipitation0.1 in
Chance of precipitation32%
Record high93° (2007)
Record low48° (1971)
Wed, 2677° / 59°0.05
77 °
Glenallen, Wednesday, 26 August
Climate normal for this date — 60-year average.
Average high77°
Average low59°
Average precipitation0.05 in
Chance of precipitation13%
Record high91° (1993)
Record low49° (1963)
Thu, 2777° / 60°0.11
77 °
Glenallen, Thursday, 27 August
Climate normal for this date — 60-year average.
Average high77°
Average low60°
Average precipitation0.11 in
Chance of precipitation37%
Record high91° (1993)
Record low49° (1989)
Fri, 2876° / 60°0.16
76 °
Glenallen, Friday, 28 August
Climate normal for this date — 60-year average.
Average high76°
Average low60°
Average precipitation0.16 in
Chance of precipitation30%
Record high88° (1993)
Record low50° (1968)
Sat, 2974° / 60°0.13
74 °
Glenallen, Saturday, 29 August
Climate normal for this date — 60-year average.
Average high74°
Average low60°
Average precipitation0.13 in
Chance of precipitation37%
Record high89° (2018)
Record low43° (1982)
Sun, 3076° / 59°0.11
76 °
Glenallen, Sunday, 30 August
Climate normal for this date — 60-year average.
Average high76°
Average low59°
Average precipitation0.11 in
Chance of precipitation27%
Record high90° (2007)
Record low42° (1965)
Mon, 3175° / 58°0.07
75 °
Glenallen, Monday, 31 August
Climate normal for this date — 60-year average.
Average high75°
Average low58°
Average precipitation0.07 in
Chance of precipitation27%
Record high91° (1973)
Record low41° (1965)
Tue, 0174° / 58°0.06
74 °
Glenallen, Tuesday, 1 September
Climate normal for this date — 60-year average.
Average high74°
Average low58°
Average precipitation0.06 in
Chance of precipitation28%
Record high90° (2010)
Record low47° (2017)
Wed, 0274° / 57°0.14
74 °
Glenallen, Wednesday, 2 September
Climate normal for this date — 60-year average.
Average high74°
Average low57°
Average precipitation0.14 in
Chance of precipitation27%
Record high91° (2010)
Record low44° (2017)
Thu, 0373° / 57°0.1
73 °
Glenallen, Thursday, 3 September
Climate normal for this date — 60-year average.
Average high73°
Average low57°
Average precipitation0.1 in
Chance of precipitation32%
Record high89° (1973)
Record low46° (1976)
Fri, 0474° / 58°0.12
74 °
Glenallen, Friday, 4 September
Climate normal for this date — 60-year average.
Average high74°
Average low58°
Average precipitation0.12 in
Chance of precipitation27%
Record high89° (1973)
Record low46° (1987)
Sat, 0574° / 57°0.07
74 °
Glenallen, Saturday, 5 September
Climate normal for this date — 60-year average.
Average high74°
Average low57°
Average precipitation0.07 in
Chance of precipitation23%
Record high87° (2008)
Record low45° (2000)
Sun, 0673° / 57°0.19
73 °
Glenallen, Sunday, 6 September
Climate normal for this date — 60-year average.
Average high73°
Average low57°
Average precipitation0.19 in
Chance of precipitation25%
Record high89° (2018)
Record low44° (2000)
Mon, 0773° / 56°0.11
73 °
Glenallen, Monday, 7 September
Climate normal for this date — 60-year average.
Average high73°
Average low56°
Average precipitation0.11 in
Chance of precipitation35%
Record high89° (2007)
Record low44° (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 Glenallen, 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 Glenallen, 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.