Monthly outlook for Mertztown, PA: average high 80.1°, average low 62.5°. That is 0.6° below the climate normal for August. Precipitation is expected on 5 days (about 1.4 inches), against a normal of 5 days and 2.0 inches. The warmest day looks like 11 August (89.4°), the coolest 22 August (52.9°).
80.1°/62.5°
Average high / low
−0.6°
Below normal
5 / 5
Wet days / normal
1.4 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
9 August – 18 August
80.9°
81.8°
-0.5°
19 August – 28 August
78.8°
80.5°
-0.9°
29 August – 7 September
at normal
79°
—
August records over 66 years
97.5°2 August 2006All-time high
45.3°29 August 1982All-time low
Climate normals and records are computed from the nearest reference point — Kutztown University (6 mi).
Mon, 1088° / 71°0.01
88 °
Mertztown, Monday, 10 August
Light rain. High 88°, low 71°.
Pressure30.00 inHg
Wind5.5 mph W
Humidity50%
Visibility6.2 mi
Dew point64°
Tue, 1189° / 69°0.02
89 °
Mertztown, Tuesday, 11 August
Light rain. High 89°, low 69°.
Pressure29.88 inHg
Wind5 mph NW
Humidity61%
Visibility6.2 mi
Dew point69°
Wed, 1284° / 68°0.07
84 °
Mertztown, Wednesday, 12 August
Rain. High 84°, low 68°.
Pressure29.74 inHg
Wind9.6 mph W
Humidity72%
Visibility6.2 mi
Dew point68°
Thu, 1381° / 62°0.01
81 °
Mertztown, Thursday, 13 August
Light rain. High 81°, low 62°.
Pressure29.80 inHg
Wind12 mph NW
Humidity38%
Visibility—
Dew point52°
Fri, 1477° / 56°0
77 °
Mertztown, Friday, 14 August
Clear. High 77°, low 56°.
Pressure30.03 inHg
Wind8.7 mph NW
Humidity37%
Visibility—
Dew point46°
Sat, 1579° / 56°0
79 °
Mertztown, Saturday, 15 August
Clear. High 79°, low 56°.
Pressure30.15 inHg
Wind12 mph NW
Humidity37%
Visibility—
Dew point48°
Sun, 1680° / 55°0
80 °
Mertztown, Sunday, 16 August
Overcast. High 80°, low 55°.
Pressure30.18 inHg
Wind4.9 mph S
Humidity36%
Visibility—
Dew point48°
Mon, 1776° / 59°0.03
76 °
Mertztown, Monday, 17 August
Light rain. High 76°, low 59°.
Pressure30.09 inHg
Wind9.8 mph S
Humidity69%
Visibility—
Dew point61°
Tue, 1867° / 64°0.14
67 °
Mertztown, Tuesday, 18 August
Light rain. High 67°, low 64°.
Pressure30.09 inHg
Wind8.6 mph SE
Humidity91%
Visibility—
Dew point64°
Wed, 1976° / 65°0.05
76 °
Mertztown, Wednesday, 19 August
Light rain. High 76°, low 65°.
Pressure29.94 inHg
Wind9.2 mph S
Humidity80%
Visibility—
Dew point62°
Thu, 2077° / 66°1.07
77 °
Mertztown, Thursday, 20 August
Heavy rain. High 77°, low 66°.
Pressure29.68 inHg
Wind16.3 mph W
Humidity48%
Visibility—
Dew point55°
Fri, 2177° / 58°0
77 °
Mertztown, Friday, 21 August
Clear. High 77°, low 58°.
Pressure29.85 inHg
Wind14.2 mph NW
Humidity36%
Visibility—
Dew point46°
Sat, 2277° / 53°0
77 °
Mertztown, Saturday, 22 August
Mostly clear. High 77°, low 53°.
Pressure30.06 inHg
Wind5.6 mph SW
Humidity36%
Visibility—
Dew point45°
Sun, 2381° / 60°0.04
81 °
Mertztown, Sunday, 23 August
Light rain. High 81°, low 60°.
Pressure29.97 inHg
Wind12.5 mph S
Humidity63%
Visibility—
Dew point64°
Mon, 2485° / 68°0.01
85 °
Mertztown, Monday, 24 August
Light rain. High 85°, low 68°.
Pressure29.88 inHg
Wind10.7 mph W
Humidity41%
Visibility—
Dew point57°
From day 17 onward the outlook is built from 60-year climate statistics
Tue, 2581° / 62°0.06
81 °
Mertztown, Tuesday, 25 August
Climate normal for this date — 60-year average.
Average high81°
Average low62°
Average precipitation0.06 in
Chance of precipitation20%
Record high94° (1968)
Record low50° (1987)
Wed, 2682° / 63°0.05
82 °
Mertztown, Wednesday, 26 August
Climate normal for this date — 60-year average.
Average high82°
Average low63°
Average precipitation0.05 in
Chance of precipitation20%
Record high92° (1993)
Record low51° (1977)
Thu, 2782° / 64°0.17
82 °
Mertztown, Thursday, 27 August
Climate normal for this date — 60-year average.
Average high82°
Average low64°
Average precipitation0.17 in
Chance of precipitation30%
Record high93° (1993)
Record low53° (1963)
Fri, 2881° / 64°0.17
81 °
Mertztown, Friday, 28 August
Climate normal for this date — 60-year average.
Average high81°
Average low64°
Average precipitation0.17 in
Chance of precipitation38%
Record high94° (1993)
Record low51° (2025)
Sat, 2980° / 64°0.12
80 °
Mertztown, Saturday, 29 August
Climate normal for this date — 60-year average.
Average high80°
Average low64°
Average precipitation0.12 in
Chance of precipitation30%
Record high92° (2010)
Record low45° (1982)
Sun, 3080° / 62°0.05
80 °
Mertztown, Sunday, 30 August
Climate normal for this date — 60-year average.
Average high80°
Average low62°
Average precipitation0.05 in
Chance of precipitation27%
Record high93° (1991)
Record low45° (1986)
Mon, 3180° / 62°0.06
80 °
Mertztown, Monday, 31 August
Climate normal for this date — 60-year average.
Average high80°
Average low62°
Average precipitation0.06 in
Chance of precipitation18%
Record high93° (1973)
Record low47° (1986)
Tue, 0178° / 61°0.15
78 °
Mertztown, Tuesday, 1 September
Climate normal for this date — 60-year average.
Average high78°
Average low61°
Average precipitation0.15 in
Chance of precipitation27%
Record high94° (2010)
Record low51° (1967)
Wed, 0279° / 61°0.12
79 °
Mertztown, Wednesday, 2 September
Climate normal for this date — 60-year average.
Average high79°
Average low61°
Average precipitation0.12 in
Chance of precipitation35%
Record high96° (2010)
Record low48° (1970)
Thu, 0379° / 61°0.12
79 °
Mertztown, Thursday, 3 September
Climate normal for this date — 60-year average.
Average high79°
Average low61°
Average precipitation0.12 in
Chance of precipitation27%
Record high92° (2015)
Record low46° (1967)
Fri, 0479° / 61°0.11
79 °
Mertztown, Friday, 4 September
Climate normal for this date — 60-year average.
Average high79°
Average low61°
Average precipitation0.11 in
Chance of precipitation22%
Record high92° (2023)
Record low49° (1987)
Sat, 0578° / 61°0.07
78 °
Mertztown, Saturday, 5 September
Climate normal for this date — 60-year average.
Average high78°
Average low61°
Average precipitation0.07 in
Chance of precipitation23%
Record high90° (2023)
Record low48° (1994)
Sun, 0678° / 60°0.23
78 °
Mertztown, Sunday, 6 September
Climate normal for this date — 60-year average.
Average high78°
Average low60°
Average precipitation0.23 in
Chance of precipitation30%
Record high92° (2023)
Record low47° (1984)
Mon, 0778° / 60°0.1
78 °
Mertztown, Monday, 7 September
Climate normal for this date — 60-year average.
Average high78°
Average low60°
Average precipitation0.1 in
Chance of precipitation23%
Record high91° (2015)
Record low43° (1984)
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 Mertztown, PA 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 Mertztown, PA 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.