Monthly outlook for Riverton, WA: average high 83.2°, average low 56.6°. That is 4.1° above the climate normal for August. Precipitation is expected on 0 days (about 0.0 inches), against a normal of 3 days and 0.7 inches. The warmest day looks like 15 August (91°), the coolest 10 August (52.1°).
83.2°/56.6°
Average high / low
+4.1°
Above normal
0 / 3
Wet days / normal
0.0 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
8 August – 17 August
84.2°
76.6°
+4.2°
18 August – 27 August
81.5°
74.2°
+4.1°
28 August – 6 September
at normal
72.2°
—
August records over 66 years
97.3°9 August 1981All-time high
44.1°30 August 1965All-time low
Sun, 0976° / 52°0
76 °
Riverton, Sunday, 9 August
Overcast. High 76°, low 52°.
Pressure30.03 inHg
Wind3.3 mph SW
Humidity37%
Visibility6.2 mi
Dew point48°
Mon, 1082° / 52°0
82 °
Riverton, Monday, 10 August
Partly cloudy. High 82°, low 52°.
Pressure30.09 inHg
Wind3.8 mph SW
Humidity43%
Visibility6.2 mi
Dew point50°
Tue, 1184° / 55°0
84 °
Riverton, Tuesday, 11 August
Clear. High 84°, low 55°.
Pressure30.09 inHg
Wind1 mph N
Humidity36%
Visibility6.2 mi
Dew point50°
Wed, 1281° / 57°0
81 °
Riverton, Wednesday, 12 August
Clear. High 81°, low 57°.
Pressure30.00 inHg
Wind5.5 mph SW
Humidity44%
Visibility6.2 mi
Dew point52°
Thu, 1381° / 55°0
81 °
Riverton, Thursday, 13 August
Clear. High 81°, low 55°.
Pressure29.94 inHg
Wind9.4 mph N
Humidity31%
Visibility—
Dew point45°
Fri, 1484° / 58°0
84 °
Riverton, Friday, 14 August
Clear. High 84°, low 58°.
Pressure29.94 inHg
Wind7.6 mph N
Humidity31%
Visibility—
Dew point47°
Sat, 1591° / 60°0
91 °
Riverton, Saturday, 15 August
Mostly clear. High 91°, low 60°.
Pressure29.97 inHg
Wind9.6 mph N
Humidity20%
Visibility—
Dew point41°
Sun, 1691° / 60°0
91 °
Riverton, Sunday, 16 August
Mostly clear. High 91°, low 60°.
Pressure29.97 inHg
Wind7 mph NW
Humidity21%
Visibility—
Dew point42°
Mon, 1789° / 60°0
89 °
Riverton, Monday, 17 August
Clear. High 89°, low 60°.
Pressure29.97 inHg
Wind10 mph N
Humidity23%
Visibility—
Dew point44°
Tue, 1885° / 58°0
85 °
Riverton, Tuesday, 18 August
Overcast. High 85°, low 58°.
Pressure30.00 inHg
Wind5.3 mph N
Humidity26%
Visibility—
Dew point44°
Wed, 1980° / 57°0
80 °
Riverton, Wednesday, 19 August
Overcast. High 80°, low 57°.
Pressure30.06 inHg
Wind7.4 mph N
Humidity34%
Visibility—
Dew point47°
Thu, 2081° / 57°0
81 °
Riverton, Thursday, 20 August
Clear. High 81°, low 57°.
Pressure30.03 inHg
Wind10.6 mph N
Humidity36%
Visibility—
Dew point49°
Fri, 2180° / 56°0
80 °
Riverton, Friday, 21 August
Clear. High 80°, low 56°.
Pressure30.00 inHg
Wind8.2 mph N
Humidity35%
Visibility—
Dew point47°
Sat, 2286° / 56°0
86 °
Riverton, Saturday, 22 August
Overcast. High 86°, low 56°.
Pressure29.94 inHg
Wind7.8 mph N
Humidity32%
Visibility—
Dew point47°
Sun, 2376° / 55°0
76 °
Riverton, Sunday, 23 August
Overcast. High 76°, low 55°.
Pressure30.03 inHg
Wind7.5 mph N
Humidity49%
Visibility—
Dew point49°
From day 17 onward the outlook is built from 60-year climate statistics
Mon, 2473° / 56°0.07
73 °
Riverton, Monday, 24 August
Climate normal for this date — 60-year average.
Average high73°
Average low56°
Average precipitation0.07 in
Chance of precipitation18%
Record high87° (2025)
Record low49° (1993)
Tue, 2574° / 55°0.07
74 °
Riverton, Tuesday, 25 August
Climate normal for this date — 60-year average.
Average high74°
Average low55°
Average precipitation0.07 in
Chance of precipitation17%
Record high88° (2022)
Record low46° (1995)
Wed, 2675° / 55°0.04
75 °
Riverton, Wednesday, 26 August
Climate normal for this date — 60-year average.
Average high75°
Average low55°
Average precipitation0.04 in
Chance of precipitation18%
Record high89° (1986)
Record low50° (1960)
Thu, 2774° / 56°0.08
74 °
Riverton, Thursday, 27 August
Climate normal for this date — 60-year average.
Average high74°
Average low56°
Average precipitation0.08 in
Chance of precipitation27%
Record high91° (1986)
Record low48° (1962)
Fri, 2874° / 56°0.04
74 °
Riverton, Friday, 28 August
Climate normal for this date — 60-year average.
Average high74°
Average low56°
Average precipitation0.04 in
Chance of precipitation18%
Record high91° (1967)
Record low47° (2000)
Sat, 2973° / 56°0.1
73 °
Riverton, Saturday, 29 August
Climate normal for this date — 60-year average.
Average high73°
Average low56°
Average precipitation0.1 in
Chance of precipitation25%
Record high86° (1996)
Record low47° (1980)
Sun, 3072° / 56°0.07
72 °
Riverton, Sunday, 30 August
Climate normal for this date — 60-year average.
Average high72°
Average low56°
Average precipitation0.07 in
Chance of precipitation30%
Record high87° (1967)
Record low44° (1965)
Mon, 3171° / 55°0.06
71 °
Riverton, Monday, 31 August
Climate normal for this date — 60-year average.
Average high71°
Average low55°
Average precipitation0.06 in
Chance of precipitation30%
Record high91° (1987)
Record low47° (1964)
Tue, 0172° / 55°0.08
72 °
Riverton, Tuesday, 1 September
Climate normal for this date — 60-year average.
Average high72°
Average low55°
Average precipitation0.08 in
Chance of precipitation27%
Record high88° (1987)
Record low44° (1973)
Wed, 0272° / 54°0.08
72 °
Riverton, Wednesday, 2 September
Climate normal for this date — 60-year average.
Average high72°
Average low54°
Average precipitation0.08 in
Chance of precipitation30%
Record high93° (1988)
Record low45° (1960)
Thu, 0372° / 55°0.08
72 °
Riverton, Thursday, 3 September
Climate normal for this date — 60-year average.
Average high72°
Average low55°
Average precipitation0.08 in
Chance of precipitation23%
Record high92° (1988)
Record low44° (1975)
Fri, 0472° / 54°0.06
72 °
Riverton, Friday, 4 September
Climate normal for this date — 60-year average.
Average high72°
Average low54°
Average precipitation0.06 in
Chance of precipitation20%
Record high85° (2003)
Record low46° (1965)
Sat, 0571° / 55°0.07
71 °
Riverton, Saturday, 5 September
Climate normal for this date — 60-year average.
Average high71°
Average low55°
Average precipitation0.07 in
Chance of precipitation30%
Record high93° (2017)
Record low46° (2000)
Sun, 0671° / 54°0.11
71 °
Riverton, Sunday, 6 September
Climate normal for this date — 60-year average.
Average high71°
Average low54°
Average precipitation0.11 in
Chance of precipitation27%
Record high90° (2017)
Record low45° (1960)
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 Riverton, WA 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 Riverton, WA 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.