Monthly outlook for River Valley, PA: average high 79.6°, average low 60.1°. That is 0.4° below the climate normal for August. Precipitation is expected on 6 days (about 2.5 inches), against a normal of 7 days and 2.2 inches. The warmest day looks like 23 August (84.8°), the coolest 22 August (51.1°).
79.6°/60.1°
Average high / low
−0.4°
Below normal
6 / 7
Wet days / normal
2.5 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
8 August – 17 August
79.8°
80.6°
-0.4°
18 August – 27 August
79.1°
79.8°
-0.4°
28 August – 6 September
at normal
78.7°
—
August records over 66 years
96.6°17 August 1988All-time high
45°29 August 1982All-time low
Climate normals and records are computed from the nearest reference point — Pittsburgh (11 mi).
Sun, 0984° / 69°0.02
84 °
River Valley, Sunday, 9 August
Light rain. High 84°, low 69°.
Pressure30.06 inHg
Wind4.2 mph W
Humidity50%
Visibility6.2 mi
Dew point61°
Mon, 1084° / 64°1.56
84 °
River Valley, Monday, 10 August
Heavy rain. High 84°, low 64°.
Pressure30.03 inHg
Wind8.3 mph SW
Humidity82%
Visibility5.3 mi
Dew point68°
Tue, 1181° / 64°0.15
81 °
River Valley, Tuesday, 11 August
Rain. High 81°, low 64°.
Pressure29.97 inHg
Wind6.5 mph SW
Humidity73%
Visibility6.2 mi
Dew point67°
Wed, 1280° / 67°0.06
80 °
River Valley, Wednesday, 12 August
Light rain. High 80°, low 67°.
Pressure29.80 inHg
Wind6.8 mph W
Humidity92%
Visibility6.2 mi
Dew point69°
Thu, 1375° / 60°0
75 °
River Valley, Thursday, 13 August
Partly cloudy. High 75°, low 60°.
Pressure29.94 inHg
Wind11.2 mph NW
Humidity39%
Visibility—
Dew point47°
Fri, 1477° / 54°0
77 °
River Valley, Friday, 14 August
Clear. High 77°, low 54°.
Pressure30.06 inHg
Wind7 mph N
Humidity40%
Visibility—
Dew point48°
Sat, 1577° / 54°0
77 °
River Valley, Saturday, 15 August
Mostly clear. High 77°, low 54°.
Pressure30.24 inHg
Wind7.2 mph NW
Humidity39%
Visibility—
Dew point48°
Sun, 1681° / 54°0
81 °
River Valley, Sunday, 16 August
Partly cloudy. High 81°, low 54°.
Pressure30.15 inHg
Wind3.1 mph NE
Humidity37%
Visibility—
Dew point49°
Mon, 1776° / 60°0.01
76 °
River Valley, Monday, 17 August
Light rain. High 76°, low 60°.
Pressure30.03 inHg
Wind4.6 mph NW
Humidity53%
Visibility—
Dew point56°
Tue, 1884° / 58°0
84 °
River Valley, Tuesday, 18 August
Clear. High 84°, low 58°.
Pressure30.00 inHg
Wind3.8 mph SE
Humidity48%
Visibility—
Dew point59°
Wed, 1984° / 64°0.37
84 °
River Valley, Wednesday, 19 August
Rain. High 84°, low 64°.
Pressure29.85 inHg
Wind8.8 mph SW
Humidity50%
Visibility—
Dew point61°
Thu, 2071° / 59°0.05
71 °
River Valley, Thursday, 20 August
Light rain. High 71°, low 59°.
Pressure29.83 inHg
Wind11.7 mph NW
Humidity60%
Visibility—
Dew point55°
Fri, 2174° / 52°0
74 °
River Valley, Friday, 21 August
Clear. High 74°, low 52°.
Pressure30.00 inHg
Wind9.4 mph NW
Humidity40%
Visibility—
Dew point46°
Sat, 2277° / 51°0.02
77 °
River Valley, Saturday, 22 August
Light rain. High 77°, low 51°.
Pressure30.03 inHg
Wind4.9 mph S
Humidity34%
Visibility—
Dew point44°
Sun, 2385° / 63°0.02
85 °
River Valley, Sunday, 23 August
Light rain. High 85°, low 63°.
Pressure29.91 inHg
Wind10.7 mph SW
Humidity75%
Visibility—
Dew point69°
From day 17 onward the outlook is built from 60-year climate statistics
Mon, 2479° / 62°0.05
79 °
River Valley, Monday, 24 August
Climate normal for this date — 60-year average.
Average high79°
Average low62°
Average precipitation0.05 in
Chance of precipitation27%
Record high92° (2007)
Record low49° (1971)
Tue, 2580° / 62°0.09
80 °
River Valley, Tuesday, 25 August
Climate normal for this date — 60-year average.
Average high80°
Average low62°
Average precipitation0.09 in
Chance of precipitation28%
Record high90° (1993)
Record low51° (1977)
Wed, 2680° / 62°0.09
80 °
River Valley, Wednesday, 26 August
Climate normal for this date — 60-year average.
Average high80°
Average low62°
Average precipitation0.09 in
Chance of precipitation32%
Record high93° (1993)
Record low53° (1963)
Thu, 2781° / 64°0.13
81 °
River Valley, Thursday, 27 August
Climate normal for this date — 60-year average.
Average high81°
Average low64°
Average precipitation0.13 in
Chance of precipitation43%
Record high93° (2024)
Record low52° (1969)
Fri, 2880° / 64°0.19
80 °
River Valley, Friday, 28 August
Climate normal for this date — 60-year average.
Average high80°
Average low64°
Average precipitation0.19 in
Chance of precipitation40%
Record high92° (1973)
Record low50° (1968)
Sat, 2980° / 63°0.12
80 °
River Valley, Saturday, 29 August
Climate normal for this date — 60-year average.
Average high80°
Average low63°
Average precipitation0.12 in
Chance of precipitation40%
Record high91° (1991)
Record low45° (1982)
Sun, 3079° / 62°0.14
79 °
River Valley, Sunday, 30 August
Climate normal for this date — 60-year average.
Average high79°
Average low62°
Average precipitation0.14 in
Chance of precipitation28%
Record high92° (1993)
Record low47° (1986)
Mon, 3178° / 62°0.16
78 °
River Valley, Monday, 31 August
Climate normal for this date — 60-year average.
Average high78°
Average low62°
Average precipitation0.16 in
Chance of precipitation37%
Record high93° (2012)
Record low51° (1976)
Tue, 0178° / 61°0.11
78 °
River Valley, Tuesday, 1 September
Climate normal for this date — 60-year average.
Average high78°
Average low61°
Average precipitation0.11 in
Chance of precipitation23%
Record high91° (2010)
Record low47° (1967)
Wed, 0279° / 61°0.13
79 °
River Valley, Wednesday, 2 September
Climate normal for this date — 60-year average.
Average high79°
Average low61°
Average precipitation0.13 in
Chance of precipitation42%
Record high93° (2010)
Record low49° (1967)
Thu, 0379° / 61°0.1
79 °
River Valley, Thursday, 3 September
Climate normal for this date — 60-year average.
Average high79°
Average low61°
Average precipitation0.1 in
Chance of precipitation35%
Record high94° (2011)
Record low48° (1967)
Fri, 0478° / 62°0.09
78 °
River Valley, Friday, 4 September
Climate normal for this date — 60-year average.
Average high78°
Average low62°
Average precipitation0.09 in
Chance of precipitation35%
Record high91° (2023)
Record low48° (1997)
Sat, 0578° / 60°0.12
78 °
River Valley, Saturday, 5 September
Climate normal for this date — 60-year average.
Average high78°
Average low60°
Average precipitation0.12 in
Chance of precipitation33%
Record high91° (2023)
Record low48° (1997)
Sun, 0678° / 60°0.14
78 °
River Valley, Sunday, 6 September
Climate normal for this date — 60-year average.
Average high78°
Average low60°
Average precipitation0.14 in
Chance of precipitation32%
Record high92° (2023)
Record low46° (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 River Valley, 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 River Valley, 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.