Monthly outlook for Derry, NH: average high 78.7°, average low 60.2°. That is 0.7° below the climate normal for August. Precipitation is expected on 8 days (about 2.2 inches), against a normal of 5 days and 1.9 inches. The warmest day looks like 9 August (91.7°), the coolest 16 August (51°).
78.7°/60.2°
Average high / low
−0.7°
Below normal
8 / 5
Wet days / normal
2.2 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
8 August – 17 August
81.3°
80.7°
+0.3°
18 August – 27 August
74.3°
78.8°
-2.5°
28 August – 6 September
at normal
77°
—
August records over 66 years
101.7°2 August 1975All-time high
46°31 August 1965All-time low
Climate normals and records are computed from the nearest reference point — Lawrence (14 mi).
Sun, 0992° / 70°0
92 °
Derry, Sunday, 9 August
Clear. High 92°, low 70°.
Pressure29.88 inHg
Wind9.5 mph W
Humidity39%
Visibility6.2 mi
Dew point61°
Mon, 1088° / 67°0.03
88 °
Derry, Monday, 10 August
Light rain. High 88°, low 67°.
Pressure29.94 inHg
Wind7.1 mph SW
Humidity40%
Visibility6.2 mi
Dew point58°
Tue, 1186° / 67°0
86 °
Derry, Tuesday, 11 August
Partly cloudy. High 86°, low 67°.
Pressure29.80 inHg
Wind12.2 mph NW
Humidity39%
Visibility6.2 mi
Dew point56°
Wed, 1267° / 60°0.08
67 °
Derry, Wednesday, 12 August
Light rain. High 67°, low 60°.
Pressure29.80 inHg
Wind3.3 mph E
Humidity95%
Visibility6.2 mi
Dew point62°
Thu, 1383° / 59°0.04
83 °
Derry, Thursday, 13 August
Light rain. High 83°, low 59°.
Pressure29.71 inHg
Wind13.1 mph NW
Humidity85%
Visibility—
Dew point65°
Fri, 1476° / 53°0
76 °
Derry, Friday, 14 August
Clear. High 76°, low 53°.
Pressure29.88 inHg
Wind10.6 mph NW
Humidity44%
Visibility—
Dew point44°
Sat, 1575° / 52°0
75 °
Derry, Saturday, 15 August
Clear. High 75°, low 52°.
Pressure30.09 inHg
Wind8.8 mph NW
Humidity39%
Visibility—
Dew point42°
Sun, 1678° / 51°0
78 °
Derry, Sunday, 16 August
Partly cloudy. High 78°, low 51°.
Pressure30.27 inHg
Wind5.8 mph SE
Humidity36%
Visibility—
Dew point42°
Mon, 1781° / 56°0
81 °
Derry, Monday, 17 August
Overcast. High 81°, low 56°.
Pressure30.18 inHg
Wind8.7 mph SW
Humidity37%
Visibility—
Dew point46°
Tue, 1872° / 62°0.41
72 °
Derry, Tuesday, 18 August
Rain. High 72°, low 62°.
Pressure30.00 inHg
Wind7.7 mph SW
Humidity99%
Visibility—
Dew point63°
Wed, 1974° / 61°0.18
74 °
Derry, Wednesday, 19 August
Light rain. High 74°, low 61°.
Pressure29.85 inHg
Wind4.7 mph NE
Humidity68%
Visibility—
Dew point61°
Thu, 2077° / 58°0.04
77 °
Derry, Thursday, 20 August
Light rain. High 77°, low 58°.
Pressure30.00 inHg
Wind5.5 mph E
Humidity61%
Visibility—
Dew point55°
Fri, 2176° / 58°0.54
76 °
Derry, Friday, 21 August
Rain. High 76°, low 58°.
Pressure29.97 inHg
Wind10 mph SW
Humidity58%
Visibility—
Dew point58°
Sat, 2278° / 62°0.84
78 °
Derry, Saturday, 22 August
Rain. High 78°, low 62°.
Pressure29.77 inHg
Wind6.4 mph S
Humidity84%
Visibility—
Dew point66°
Sun, 2370° / 56°0
70 °
Derry, Sunday, 23 August
Partly cloudy. High 70°, low 56°.
Pressure29.77 inHg
Wind14.8 mph NW
Humidity44%
Visibility—
Dew point42°
From day 17 onward the outlook is built from 60-year climate statistics
Mon, 2478° / 62°0.08
78 °
Derry, Monday, 24 August
Climate normal for this date — 60-year average.
Average high78°
Average low62°
Average precipitation0.08 in
Chance of precipitation28%
Record high91° (2007)
Record low52° (1971)
Tue, 2578° / 62°0.12
78 °
Derry, Tuesday, 25 August
Climate normal for this date — 60-year average.
Average high78°
Average low62°
Average precipitation0.12 in
Chance of precipitation27%
Record high96° (2007)
Record low53° (1971)
Wed, 2680° / 62°0.04
80 °
Derry, Wednesday, 26 August
Climate normal for this date — 60-year average.
Average high80°
Average low62°
Average precipitation0.04 in
Chance of precipitation20%
Record high95° (1993)
Record low52° (1981)
Thu, 2780° / 63°0.08
80 °
Derry, Thursday, 27 August
Climate normal for this date — 60-year average.
Average high80°
Average low63°
Average precipitation0.08 in
Chance of precipitation33%
Record high97° (1993)
Record low51° (1989)
Fri, 2879° / 63°0.12
79 °
Derry, Friday, 28 August
Climate normal for this date — 60-year average.
Average high79°
Average low63°
Average precipitation0.12 in
Chance of precipitation27%
Record high95° (1993)
Record low53° (1986)
Sat, 2978° / 63°0.15
78 °
Derry, Saturday, 29 August
Climate normal for this date — 60-year average.
Average high78°
Average low63°
Average precipitation0.15 in
Chance of precipitation28%
Record high93° (2018)
Record low48° (1982)
Sun, 3079° / 62°0.11
79 °
Derry, Sunday, 30 August
Climate normal for this date — 60-year average.
Average high79°
Average low62°
Average precipitation0.11 in
Chance of precipitation25%
Record high94° (1973)
Record low47° (1965)
Mon, 3178° / 61°0.09
78 °
Derry, Monday, 31 August
Climate normal for this date — 60-year average.
Average high78°
Average low61°
Average precipitation0.09 in
Chance of precipitation28%
Record high93° (2010)
Record low46° (1965)
Tue, 0177° / 61°0.05
77 °
Derry, Tuesday, 1 September
Climate normal for this date — 60-year average.
Average high77°
Average low61°
Average precipitation0.05 in
Chance of precipitation23%
Record high94° (2010)
Record low49° (1975)
Wed, 0276° / 60°0.14
76 °
Derry, Wednesday, 2 September
Climate normal for this date — 60-year average.
Average high76°
Average low60°
Average precipitation0.14 in
Chance of precipitation27%
Record high94° (2010)
Record low49° (2017)
Thu, 0376° / 60°0.11
76 °
Derry, Thursday, 3 September
Climate normal for this date — 60-year average.
Average high76°
Average low60°
Average precipitation0.11 in
Chance of precipitation35%
Record high93° (1973)
Record low51° (1967)
Fri, 0477° / 60°0.11
77 °
Derry, Friday, 4 September
Climate normal for this date — 60-year average.
Average high77°
Average low60°
Average precipitation0.11 in
Chance of precipitation23%
Record high90° (1973)
Record low50° (1987)
Sat, 0576° / 60°0.08
76 °
Derry, Saturday, 5 September
Climate normal for this date — 60-year average.
Average high76°
Average low60°
Average precipitation0.08 in
Chance of precipitation22%
Record high92° (2018)
Record low49° (1994)
Sun, 0675° / 60°0.13
75 °
Derry, Sunday, 6 September
Climate normal for this date — 60-year average.
Average high75°
Average low60°
Average precipitation0.13 in
Chance of precipitation27%
Record high94° (2018)
Record low49° (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 Derry, NH 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 Derry, NH 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.