Monthly outlook for Walnut Hill, ME: average high 78.3°, average low 60.1°. That is 2.1° above the climate normal for August. Precipitation is expected on 5 days (about 1.8 inches), against a normal of 5 days and 1.9 inches. The warmest day looks like 9 August (90.2°), the coolest 23 August (53.4°).
78.3°/60.1°
Average high / low
+2.1°
Above normal
5 / 5
Wet days / normal
1.8 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
8 August – 17 August
79.7°
75.1°
+2.6°
18 August – 27 August
75.9°
73.5°
+1.3°
28 August – 6 September
at normal
71.8°
—
August records over 66 years
93.6°12 August 2025All-time high
48°30 August 1965All-time low
Climate normals and records are computed from the nearest reference point — Portland (10 mi).
Sun, 0990° / 69°0.03
90 °
Walnut Hill, Sunday, 9 August
Light rain. High 90°, low 69°.
Pressure29.85 inHg
Wind3.6 mph SW
Humidity43%
Visibility6.2 mi
Dew point64°
Mon, 1085° / 66°0.02
85 °
Walnut Hill, Monday, 10 August
Light rain. High 85°, low 66°.
Pressure29.91 inHg
Wind8.5 mph S
Humidity36%
Visibility6.2 mi
Dew point56°
Tue, 1186° / 62°0.08
86 °
Walnut Hill, Tuesday, 11 August
Rain. High 86°, low 62°.
Pressure29.71 inHg
Wind3.4 mph NW
Humidity45%
Visibility6.2 mi
Dew point62°
Wed, 1273° / 60°0.24
73 °
Walnut Hill, Wednesday, 12 August
Rain. High 73°, low 60°.
Pressure29.77 inHg
Wind3.7 mph SW
Humidity91%
Visibility6.2 mi
Dew point60°
Thu, 1375° / 59°0.19
75 °
Walnut Hill, Thursday, 13 August
Light rain. High 75°, low 59°.
Pressure29.65 inHg
Wind6.1 mph SW
Humidity66%
Visibility—
Dew point61°
Fri, 1471° / 55°0
71 °
Walnut Hill, Friday, 14 August
Clear. High 71°, low 55°.
Pressure29.88 inHg
Wind10 mph W
Humidity41%
Visibility—
Dew point43°
Sat, 1576° / 55°0
76 °
Walnut Hill, Saturday, 15 August
Clear. High 76°, low 55°.
Pressure29.94 inHg
Wind12.9 mph NW
Humidity47%
Visibility—
Dew point48°
Sun, 1677° / 56°0
77 °
Walnut Hill, Sunday, 16 August
Clear. High 77°, low 56°.
Pressure30.12 inHg
Wind5.7 mph N
Humidity43%
Visibility—
Dew point47°
Mon, 1780° / 57°0
80 °
Walnut Hill, Monday, 17 August
Partly cloudy. High 80°, low 57°.
Pressure30.15 inHg
Wind11.6 mph S
Humidity45%
Visibility—
Dew point51°
Tue, 1877° / 63°0.02
77 °
Walnut Hill, Tuesday, 18 August
Light rain. High 77°, low 63°.
Pressure30.12 inHg
Wind10.9 mph S
Humidity73%
Visibility—
Dew point59°
Wed, 1979° / 61°0
79 °
Walnut Hill, Wednesday, 19 August
Overcast. High 79°, low 61°.
Pressure29.97 inHg
Wind12.2 mph S
Humidity47%
Visibility—
Dew point54°
Thu, 2069° / 63°1.04
69 °
Walnut Hill, Thursday, 20 August
Rain. High 69°, low 63°.
Pressure29.62 inHg
Wind12.8 mph S
Humidity98%
Visibility—
Dew point66°
Fri, 2174° / 58°0
74 °
Walnut Hill, Friday, 21 August
Partly cloudy. High 74°, low 58°.
Pressure29.53 inHg
Wind12 mph NW
Humidity54%
Visibility—
Dew point54°
Sat, 2275° / 55°0
75 °
Walnut Hill, Saturday, 22 August
Clear. High 75°, low 55°.
Pressure29.91 inHg
Wind10.4 mph NW
Humidity37%
Visibility—
Dew point40°
Sun, 2380° / 53°0.01
80 °
Walnut Hill, Sunday, 23 August
Light rain. High 80°, low 53°.
Pressure30.06 inHg
Wind10.5 mph S
Humidity32%
Visibility—
Dew point39°
From day 17 onward the outlook is built from 60-year climate statistics
Mon, 2473° / 62°0.07
73 °
Walnut Hill, Monday, 24 August
Climate normal for this date — 60-year average.
Average high73°
Average low62°
Average precipitation0.07 in
Chance of precipitation27%
Record high82° (1980)
Record low53° (1971)
Tue, 2573° / 62°0.11
73 °
Walnut Hill, Tuesday, 25 August
Climate normal for this date — 60-year average.
Average high73°
Average low62°
Average precipitation0.11 in
Chance of precipitation32%
Record high86° (2020)
Record low53° (1989)
Wed, 2674° / 62°0.04
74 °
Walnut Hill, Wednesday, 26 August
Climate normal for this date — 60-year average.
Average high74°
Average low62°
Average precipitation0.04 in
Chance of precipitation17%
Record high86° (2021)
Record low54° (2019)
Thu, 2774° / 62°0.05
74 °
Walnut Hill, Thursday, 27 August
Climate normal for this date — 60-year average.
Average high74°
Average low62°
Average precipitation0.05 in
Chance of precipitation27%
Record high84° (1983)
Record low52° (2019)
Fri, 2873° / 62°0.14
73 °
Walnut Hill, Friday, 28 August
Climate normal for this date — 60-year average.
Average high73°
Average low62°
Average precipitation0.14 in
Chance of precipitation28%
Record high90° (2018)
Record low54° (2025)
Sat, 2972° / 62°0.15
72 °
Walnut Hill, Saturday, 29 August
Climate normal for this date — 60-year average.
Average high72°
Average low62°
Average precipitation0.15 in
Chance of precipitation28%
Record high86° (2010)
Record low49° (1982)
Sun, 3073° / 61°0.14
73 °
Walnut Hill, Sunday, 30 August
Climate normal for this date — 60-year average.
Average high73°
Average low61°
Average precipitation0.14 in
Chance of precipitation27%
Record high86° (2010)
Record low48° (1965)
Mon, 3173° / 61°0.09
73 °
Walnut Hill, Monday, 31 August
Climate normal for this date — 60-year average.
Average high73°
Average low61°
Average precipitation0.09 in
Chance of precipitation22%
Record high89° (2010)
Record low48° (1965)
Tue, 0172° / 60°0.03
72 °
Walnut Hill, Tuesday, 1 September
Climate normal for this date — 60-year average.
Average high72°
Average low60°
Average precipitation0.03 in
Chance of precipitation18%
Record high85° (2010)
Record low50° (2017)
Wed, 0271° / 60°0.11
71 °
Walnut Hill, Wednesday, 2 September
Climate normal for this date — 60-year average.
Average high71°
Average low60°
Average precipitation0.11 in
Chance of precipitation28%
Record high87° (2010)
Record low49° (2017)
Thu, 0371° / 60°0.11
71 °
Walnut Hill, Thursday, 3 September
Climate normal for this date — 60-year average.
Average high71°
Average low60°
Average precipitation0.11 in
Chance of precipitation30%
Record high87° (2018)
Record low52° (2024)
Fri, 0471° / 60°0.14
71 °
Walnut Hill, Friday, 4 September
Climate normal for this date — 60-year average.
Average high71°
Average low60°
Average precipitation0.14 in
Chance of precipitation33%
Record high83° (2023)
Record low53° (1965)
Sat, 0571° / 60°0.08
71 °
Walnut Hill, Saturday, 5 September
Climate normal for this date — 60-year average.
Average high71°
Average low60°
Average precipitation0.08 in
Chance of precipitation22%
Record high89° (2023)
Record low50° (1963)
Sun, 0670° / 60°0.12
70 °
Walnut Hill, Sunday, 6 September
Climate normal for this date — 60-year average.
Average high70°
Average low60°
Average precipitation0.12 in
Chance of precipitation32%
Record high89° (2018)
Record low50° (2000)
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 Walnut Hill, ME 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 Walnut Hill, ME 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.