Monthly outlook for Tukwila, WA: average high 84.8°, average low 58.5°. That is 5.1° above the climate normal for August. Precipitation is expected on 0 days (about 0.0 inches), against a normal of 3 days and 0.8 inches. The warmest day looks like 14 August (89.7°), the coolest 10 August (52.5°).
84.8°/58.5°
Average high / low
+5.1°
Above normal
0 / 3
Wet days / normal
0.0 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
9 August – 18 August
83.6°
76.5°
+4°
19 August – 28 August
86.7°
74°
+7°
29 August – 7 September
at normal
71.9°
—
August records over 66 years
97.5°9 August 1981All-time high
44.2°30 August 1965All-time low
Climate normals and records are computed from the nearest reference point — Skyway (1 mi).
Mon, 1077° / 52°0
77 °
Tukwila, Monday, 10 August
Overcast. High 77°, low 52°.
Pressure30.09 inHg
Wind4.1 mph SW
Humidity45%
Visibility6.2 mi
Dew point50°
Tue, 1184° / 56°0
84 °
Tukwila, Tuesday, 11 August
Clear. High 84°, low 56°.
Pressure30.09 inHg
Wind1.2 mph W
Humidity37%
Visibility6.2 mi
Dew point50°
Wed, 1282° / 57°0
82 °
Tukwila, Wednesday, 12 August
Clear. High 82°, low 57°.
Pressure30.00 inHg
Wind2.2 mph W
Humidity40%
Visibility6.2 mi
Dew point52°
Thu, 1382° / 58°0
82 °
Tukwila, Thursday, 13 August
Clear. High 82°, low 58°.
Pressure29.85 inHg
Wind9.5 mph N
Humidity33%
Visibility—
Dew point48°
Fri, 1490° / 60°0
90 °
Tukwila, Friday, 14 August
Partly cloudy. High 90°, low 60°.
Pressure29.85 inHg
Wind7.1 mph NW
Humidity25%
Visibility—
Dew point46°
Sat, 1587° / 59°0
87 °
Tukwila, Saturday, 15 August
Overcast. High 87°, low 59°.
Pressure29.97 inHg
Wind6.9 mph N
Humidity29%
Visibility—
Dew point47°
Sun, 1690° / 60°0
90 °
Tukwila, Sunday, 16 August
Partly cloudy. High 90°, low 60°.
Pressure30.03 inHg
Wind6.6 mph NW
Humidity26%
Visibility—
Dew point46°
Mon, 1782° / 57°0
82 °
Tukwila, Monday, 17 August
Partly cloudy. High 82°, low 57°.
Pressure30.12 inHg
Wind9.4 mph N
Humidity32%
Visibility—
Dew point46°
Tue, 1884° / 58°0
84 °
Tukwila, Tuesday, 18 August
Clear. High 84°, low 58°.
Pressure30.09 inHg
Wind8.1 mph N
Humidity29%
Visibility—
Dew point46°
Wed, 1988° / 60°0
88 °
Tukwila, Wednesday, 19 August
Clear. High 88°, low 60°.
Pressure30.06 inHg
Wind9.3 mph N
Humidity32%
Visibility—
Dew point51°
Thu, 2086° / 61°0
86 °
Tukwila, Thursday, 20 August
Clear. High 86°, low 61°.
Pressure30.06 inHg
Wind9.1 mph N
Humidity33%
Visibility—
Dew point51°
Fri, 2185° / 59°0
85 °
Tukwila, Friday, 21 August
Clear. High 85°, low 59°.
Pressure30.00 inHg
Wind8.1 mph N
Humidity30%
Visibility—
Dew point47°
Sat, 2288° / 61°0
88 °
Tukwila, Saturday, 22 August
Clear. High 88°, low 61°.
Pressure30.00 inHg
Wind8.7 mph N
Humidity29%
Visibility—
Dew point49°
Sun, 2386° / 62°0
86 °
Tukwila, Sunday, 23 August
Clear. High 86°, low 62°.
Pressure30.09 inHg
Wind9.1 mph N
Humidity34%
Visibility—
Dew point52°
Mon, 2488° / 61°0
88 °
Tukwila, Monday, 24 August
Clear. High 88°, low 61°.
Pressure29.91 inHg
Wind9.7 mph N
Humidity28%
Visibility—
Dew point48°
From day 17 onward the outlook is built from 60-year climate statistics
Tue, 2574° / 55°0.07
74 °
Tukwila, Tuesday, 25 August
Climate normal for this date — 60-year average.
Average high74°
Average low55°
Average precipitation0.07 in
Chance of precipitation18%
Record high87° (2022)
Record low46° (1995)
Wed, 2675° / 55°0.05
75 °
Tukwila, Wednesday, 26 August
Climate normal for this date — 60-year average.
Average high75°
Average low55°
Average precipitation0.05 in
Chance of precipitation22%
Record high89° (1986)
Record low50° (1976)
Thu, 2774° / 56°0.09
74 °
Tukwila, Thursday, 27 August
Climate normal for this date — 60-year average.
Average high74°
Average low56°
Average precipitation0.09 in
Chance of precipitation27%
Record high91° (1986)
Record low48° (1962)
Fri, 2874° / 56°0.04
74 °
Tukwila, 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°0.11
73 °
Tukwila, Saturday, 29 August
Climate normal for this date — 60-year average.
Average high73°
Average low56°
Average precipitation0.11 in
Chance of precipitation25%
Record high86° (1996)
Record low47° (1965)
Sun, 3072° / 56°0.07
72 °
Tukwila, Sunday, 30 August
Climate normal for this date — 60-year average.
Average high72°
Average low56°
Average precipitation0.07 in
Chance of precipitation33%
Record high87° (1967)
Record low44° (1965)
Mon, 3171° / 55°0.07
71 °
Tukwila, Monday, 31 August
Climate normal for this date — 60-year average.
Average high71°
Average low55°
Average precipitation0.07 in
Chance of precipitation32%
Record high91° (1987)
Record low47° (1964)
Tue, 0172° / 55°0.08
72 °
Tukwila, Tuesday, 1 September
Climate normal for this date — 60-year average.
Average high72°
Average low55°
Average precipitation0.08 in
Chance of precipitation27%
Record high89° (1987)
Record low44° (1973)
Wed, 0272° / 54°0.08
72 °
Tukwila, 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 °
Tukwila, Thursday, 3 September
Climate normal for this date — 60-year average.
Average high72°
Average low55°
Average precipitation0.08 in
Chance of precipitation25%
Record high92° (1988)
Record low44° (1975)
Fri, 0472° / 54°0.06
72 °
Tukwila, Friday, 4 September
Climate normal for this date — 60-year average.
Average high72°
Average low54°
Average precipitation0.06 in
Chance of precipitation22%
Record high85° (2017)
Record low46° (1965)
Sat, 0571° / 55°0.08
71 °
Tukwila, Saturday, 5 September
Climate normal for this date — 60-year average.
Average high71°
Average low55°
Average precipitation0.08 in
Chance of precipitation32%
Record high92° (2017)
Record low47° (2000)
Sun, 0671° / 54°0.11
71 °
Tukwila, Sunday, 6 September
Climate normal for this date — 60-year average.
Average high71°
Average low54°
Average precipitation0.11 in
Chance of precipitation28%
Record high88° (2017)
Record low45° (1960)
Mon, 0771° / 54°0.06
71 °
Tukwila, Monday, 7 September
Climate normal for this date — 60-year average.
Average high71°
Average low54°
Average precipitation0.06 in
Chance of precipitation30%
Record high88° (1981)
Record low42° (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 Tukwila, 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 Tukwila, 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.