As of 13:13 PDT

Weather in SeaTac, WA

58°

SeaTac, Thursday, 22 October, 13:13

Partly cloudy. Feels like 56°. High 58°, low 41°.

Pressure29.94 inHg

Wind13.8 mph N

Humidity67%

Visibility6.2 mi

Dew point47°

See detailed hourly forecast

Monthly outlook for SeaTac, WA: average high 56.5°, average low 44°. That is 1.6° above the climate normal for October. Precipitation is expected on 4 days (about 2.2 inches), against a normal of 9 days and 3.6 inches. The warmest day looks like 3 November (63.5°), the coolest 24 October (34.8°).

56.5°/44°

Average high / low

+1.6°

Above normal

4 / 9

Wet days / normal

2.2 in

Precipitation this month

Ten-day blocks vs climate normal

Period	Forecast high	Normal	Difference
22 October – 31 October	55.3°	54.5°	+0.4°
1 November – 10 November	58.7°	51.8°	+3.8°
11 November – 20 November	at normal	49°	—

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, 2358° / 39°

58 °

SeaTac, Friday, 23 October

Partly cloudy. High 58°, low 39°.

Pressure30.33 inHg

Wind3.6 mph NW

Humidity68%

Visibility1.0 mi

Dew point42°

Sat, 2452° / 35°

52 °

SeaTac, Saturday, 24 October

Light rain. High 52°, low 35°.

Pressure30.18 inHg

Wind2.4 mph W

Humidity73%

Visibility6.2 mi

Dew point40°

Sun, 2551° / 45°

0.23

51 °

SeaTac, Sunday, 25 October

Light rain. High 51°, low 45°.

Pressure29.97 inHg

Wind0.9 mph N

Humidity91%

Visibility3.1 mi

Dew point47°

Mon, 2654° / 44°

54 °

SeaTac, Monday, 26 October

Overcast. High 54°, low 44°.

Pressure30.03 inHg

Wind2.5 mph N

Humidity80%

Visibility1.8 mi

Dew point47°

Tue, 2755° / 42°

55 °

SeaTac, Tuesday, 27 October

Overcast. High 55°, low 42°.

Pressure30.18 inHg

Wind2.6 mph SW

Humidity91%

Visibility—

Dew point44°

Wed, 2858° / 43°

58 °

SeaTac, Wednesday, 28 October

Clear. High 58°, low 43°.

Pressure30.24 inHg

Wind9.5 mph N

Humidity69%

Visibility—

Dew point40°

Thu, 2960° / 42°

60 °

SeaTac, Thursday, 29 October

Clear. High 60°, low 42°.

Pressure29.94 inHg

Wind5 mph N

Humidity54%

Visibility—

Dew point34°

Fri, 3054° / 44°

54 °

SeaTac, Friday, 30 October

Overcast. High 54°, low 44°.

Pressure30.00 inHg

Wind7.6 mph SW

Humidity57%

Visibility—

Dew point37°

Sat, 3153° / 44°

53 °

SeaTac, Saturday, 31 October

Overcast. High 53°, low 44°.

Pressure30.09 inHg

Wind4.6 mph S

Humidity66%

Visibility—

Dew point37°

Sun, 0157° / 42°

57 °

SeaTac, Sunday, 1 November

Overcast. High 57°, low 42°.

Pressure30.12 inHg

Wind5 mph SW

Humidity60%

Visibility—

Dew point36°

Mon, 0257° / 47°

57 °

SeaTac, Monday, 2 November

Overcast. High 57°, low 47°.

Pressure30.09 inHg

Wind4.2 mph N

Humidity55%

Visibility—

Dew point36°

Tue, 0363° / 44°

63 °

SeaTac, Tuesday, 3 November

Overcast. High 63°, low 44°.

Pressure29.83 inHg

Wind7.8 mph W

Humidity31%

Visibility—

Dew point24°

Wed, 0463° / 52°

0.43

63 °

SeaTac, Wednesday, 4 November

Rain. High 63°, low 52°.

Pressure29.85 inHg

Wind16.7 mph S

Humidity61%

Visibility—

Dew point44°

Thu, 0559° / 50°

1.06

59 °

SeaTac, Thursday, 5 November

Rain. High 59°, low 50°.

Pressure29.62 inHg

Wind19.1 mph S

Humidity79%

Visibility—

Dew point49°

Fri, 0652° / 49°

0.45

52 °

SeaTac, Friday, 6 November

Rain. High 52°, low 49°.

Pressure29.62 inHg

Wind7.8 mph S

Humidity84%

Visibility—

Dew point46°

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

Sat, 0751° / 42°

0.26

51 °

SeaTac, Saturday, 7 November

Climate normal for this date — 60-year average.

Average high51°

Average low42°

Average precipitation0.26 in

Chance of precipitation60%

Record high61° (2016)

Record low28° (2003)

Sun, 0851° / 41°

0.19

51 °

SeaTac, Sunday, 8 November

Climate normal for this date — 60-year average.

Average high51°

Average low41°

Average precipitation0.19 in

Chance of precipitation52%

Record high65° (2016)

Record low30° (1982)

Mon, 0950° / 41°

0.24

50 °

SeaTac, Monday, 9 November

Climate normal for this date — 60-year average.

Average high50°

Average low41°

Average precipitation0.24 in

Chance of precipitation67%

Record high60° (2025)

Record low32° (1982)

Tue, 1051° / 40°

0.2

51 °

SeaTac, Tuesday, 10 November

Climate normal for this date — 60-year average.

Average high51°

Average low40°

Average precipitation0.2 in

Chance of precipitation45%

Record high62° (2016)

Record low26° (1986)

Wed, 1151° / 40°

0.24

51 °

SeaTac, Wednesday, 11 November

Climate normal for this date — 60-year average.

Average high51°

Average low40°

Average precipitation0.24 in

Chance of precipitation57%

Record high61° (1996)

Record low25° (1985)

Thu, 1250° / 41°

0.26

50 °

SeaTac, Thursday, 12 November

Climate normal for this date — 60-year average.

Average high50°

Average low41°

Average precipitation0.26 in

Chance of precipitation65%

Record high58° (1990)

Record low25° (1985)

Fri, 1350° / 40°

0.29

50 °

SeaTac, Friday, 13 November

Climate normal for this date — 60-year average.

Average high50°

Average low40°

Average precipitation0.29 in

Chance of precipitation60%

Record high62° (1967)

Record low26° (2014)

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)

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.