As of 20:15 PDT

Weather in SeaTac, WA

45°

SeaTac, Thursday, 29 October, 20:15

Overcast. Feels like 44°. High 52°, low 42°.

Pressure29.94 inHg

Wind3.4 mph NW

Humidity90%

Visibility6.2 mi

Dew point43°

See detailed hourly forecast

Monthly outlook for SeaTac, WA: average high 50.9°, average low 41.7°. That is 0.4° below the climate normal for October. Precipitation is expected on 8 days (about 2.1 inches), against a normal of 9 days and 3.8 inches. The warmest day looks like 4 November (55.2°), the coolest 2 November (35.5°).

50.9°/41.7°

Average high / low

−0.4°

Below normal

8 / 9

Wet days / normal

2.1 in

Precipitation this month

Ten-day blocks vs climate normal

Period	Forecast high	Normal	Difference
29 October – 7 November	51.1°	52.4°	-0.7°
8 November – 17 November	50.6°	49.9°	+0.4°
18 November – 27 November	at normal	46.4°	—

October records over 66 years

84.9°1 October 1987All-time high

24.1°28 October 1971All-time low

Climate normals and records are computed from the nearest reference point — Riverton (4 mi).

Fri, 3049° / 42°

0.43

49 °

SeaTac, Friday, 30 October

Rain. High 49°, low 42°.

Pressure29.94 inHg

Wind1.4 mph S

Humidity92%

Visibility2.0 mi

Dew point42°

Sat, 3150° / 41°

50 °

SeaTac, Saturday, 31 October

Overcast. High 50°, low 41°.

Pressure30.03 inHg

Wind4.2 mph N

Humidity85%

Visibility5.6 mi

Dew point42°

Sun, 0150° / 41°

50 °

SeaTac, Sunday, 1 November

Overcast. High 50°, low 41°.

Pressure30.06 inHg

Wind3.6 mph N

Humidity86%

Visibility1.1 mi

Dew point44°

Mon, 0249° / 36°

49 °

SeaTac, Monday, 2 November

Overcast. High 49°, low 36°.

Pressure30.27 inHg

Wind1.7 mph N

Humidity88%

Visibility3.4 mi

Dew point42°

Tue, 0354° / 44°

54 °

SeaTac, Tuesday, 3 November

Overcast. High 54°, low 44°.

Pressure30.21 inHg

Wind5.5 mph NE

Humidity83%

Visibility—

Dew point44°

Wed, 0455° / 40°

55 °

SeaTac, Wednesday, 4 November

Overcast. High 55°, low 40°.

Pressure29.88 inHg

Wind6.1 mph NE

Humidity76%

Visibility—

Dew point40°

Thu, 0555° / 46°

0.12

55 °

SeaTac, Thursday, 5 November

Light rain. High 55°, low 46°.

Pressure29.85 inHg

Wind7.5 mph SW

Humidity85%

Visibility—

Dew point43°

Fri, 0648° / 42°

48 °

SeaTac, Friday, 6 November

Partly cloudy. High 48°, low 42°.

Pressure30.15 inHg

Wind4.3 mph S

Humidity76%

Visibility—

Dew point40°

Sat, 0750° / 41°

0.3

50 °

SeaTac, Saturday, 7 November

Rain. High 50°, low 41°.

Pressure29.88 inHg

Wind3.5 mph SW

Humidity67%

Visibility—

Dew point35°

Sun, 0853° / 44°

0.26

53 °

SeaTac, Sunday, 8 November

Rain. High 53°, low 44°.

Pressure30.12 inHg

Wind15.3 mph SW

Humidity75%

Visibility—

Dew point41°

Mon, 0950° / 41°

0.05

50 °

SeaTac, Monday, 9 November

Light rain. High 50°, low 41°.

Pressure29.80 inHg

Wind3.4 mph NE

Humidity59%

Visibility—

Dew point32°

Tue, 1053° / 44°

0.52

53 °

SeaTac, Tuesday, 10 November

Rain. High 53°, low 44°.

Pressure29.35 inHg

Wind14 mph S

Humidity72%

Visibility—

Dew point40°

Wed, 1152° / 44°

0.07

52 °

SeaTac, Wednesday, 11 November

Light rain. High 52°, low 44°.

Pressure29.88 inHg

Wind11.1 mph S

Humidity78%

Visibility—

Dew point41°

Thu, 1246° / 40°

0.03

46 °

SeaTac, Thursday, 12 November

Light rain. High 46°, low 40°.

Pressure29.53 inHg

Wind8.3 mph N

Humidity72%

Visibility—

Dew point35°

Fri, 1351° / 39°

51 °

SeaTac, Friday, 13 November

Overcast. High 51°, low 39°.

Pressure29.77 inHg

Wind3.8 mph E

Humidity69%

Visibility—

Dew point35°

From day 17 onward the outlook is built from 60-year climate statistics

Sat, 1450° / 40°

0.29

50 °

SeaTac, Saturday, 14 November

Climate normal for this date — 60-year average.

Average high50°

Average low40°

Average precipitation0.29 in

Chance of precipitation53%

Record high62° (1969)

Record low26° (2014)

Sun, 1550° / 40°

0.24

50 °

SeaTac, Sunday, 15 November

Climate normal for this date — 60-year average.

Average high50°

Average low40°

Average precipitation0.24 in

Chance of precipitation67%

Record high59° (2021)

Record low26° (2014)

Mon, 1648° / 40°

0.23

48 °

SeaTac, Monday, 16 November

Climate normal for this date — 60-year average.

Average high48°

Average low40°

Average precipitation0.23 in

Chance of precipitation72%

Record high60° (1965)

Record low26° (2014)

Tue, 1748° / 39°

0.26

48 °

SeaTac, Tuesday, 17 November

Climate normal for this date — 60-year average.

Average high48°

Average low39°

Average precipitation0.26 in

Chance of precipitation60%

Record high60° (1995)

Record low27° (1961)

Wed, 1847° / 38°

0.18

47 °

SeaTac, Wednesday, 18 November

Climate normal for this date — 60-year average.

Average high47°

Average low38°

Average precipitation0.18 in

Chance of precipitation57%

Record high57° (1965)

Record low27° (1975)

Thu, 1947° / 39°

0.31

47 °

SeaTac, Thursday, 19 November

Climate normal for this date — 60-year average.

Average high47°

Average low39°

Average precipitation0.31 in

Chance of precipitation68%

Record high58° (1987)

Record low27° (1977)

Fri, 2048° / 38°

0.23

48 °

SeaTac, Friday, 20 November

Climate normal for this date — 60-year average.

Average high48°

Average low38°

Average precipitation0.23 in

Chance of precipitation58%

Record high60° (2002)

Record low22° (1985)

Sat, 2146° / 37°

0.24

46 °

SeaTac, Saturday, 21 November

Climate normal for this date — 60-year average.

Average high46°

Average low37°

Average precipitation0.24 in

Chance of precipitation50%

Record high58° (2002)

Record low19° (1977)

Sun, 2246° / 36°

0.24

46 °

SeaTac, Sunday, 22 November

Climate normal for this date — 60-year average.

Average high46°

Average low36°

Average precipitation0.24 in

Chance of precipitation65%

Record high64° (2017)

Record low10° (1985)

Mon, 2346° / 37°

0.33

46 °

SeaTac, Monday, 23 November

Climate normal for this date — 60-year average.

Average high46°

Average low37°

Average precipitation0.33 in

Chance of precipitation70%

Record high61° (2017)

Record low1° (1985)

Tue, 2446° / 37°

0.32

46 °

SeaTac, Tuesday, 24 November

Climate normal for this date — 60-year average.

Average high46°

Average low37°

Average precipitation0.32 in

Chance of precipitation63%

Record high57° (1995)

Record low5° (1985)

Wed, 2546° / 37°

0.35

46 °

SeaTac, Wednesday, 25 November

Climate normal for this date — 60-year average.

Average high46°

Average low37°

Average precipitation0.35 in

Chance of precipitation63%

Record high55° (1977)

Record low11° (1985)

Thu, 2646° / 37°

0.22

46 °

SeaTac, Thursday, 26 November

Climate normal for this date — 60-year average.

Average high46°

Average low37°

Average precipitation0.22 in

Chance of precipitation57%

Record high57° (2014)

Record low20° (1985)

Fri, 2746° / 37°

0.28

46 °

SeaTac, Friday, 27 November

Climate normal for this date — 60-year average.

Average high46°

Average low37°

Average precipitation0.28 in

Chance of precipitation67%

Record high55° (2014)

Record low21° (1985)

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 SeaTac, 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 SeaTac, 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.