As of 04:25 PDT

Weather in SeaTac, WA

37°

SeaTac, Saturday, 31 October, 04:25

Fog. Feels like 31°. High 52°, low 37°.

Pressure29.97 inHg

Wind8.1 mph SE

Humidity94%

Visibility6.2 mi

Dew point36°

See detailed hourly forecast

Monthly outlook for SeaTac, WA: average high 55.5°, average low 44.8°. That is 2.3° above the climate normal for October. Precipitation is expected on 7 days (about 5.5 inches), against a normal of 9 days and 3.9 inches. The warmest day looks like 8 November (61.7°), the coolest 2 November (35.9°).

55.5°/44.8°

Average high / low

+2.3°

Above normal

7 / 9

Wet days / normal

5.5 in

Precipitation this month

Ten-day blocks vs climate normal

Period	Forecast high	Normal	Difference
31 October – 9 November	54.5°	52°	+1.4°
10 November – 19 November	57°	49.3°	+4.3°
20 November – 29 November	at normal	45.9°	—

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).

Sun, 0154° / 40°

54 °

SeaTac, Sunday, 1 November

Overcast. High 54°, low 40°.

Pressure30.09 inHg

Wind1.3 mph W

Humidity89%

Visibility6.2 mi

Dew point44°

Mon, 0248° / 36°

48 °

SeaTac, Monday, 2 November

Overcast. High 48°, low 36°.

Pressure30.24 inHg

Wind2.2 mph NW

Humidity85%

Visibility0.6 mi

Dew point42°

Tue, 0355° / 44°

55 °

SeaTac, Tuesday, 3 November

Overcast. High 55°, low 44°.

Pressure30.09 inHg

Wind5.4 mph N

Humidity77%

Visibility6.2 mi

Dew point45°

Wed, 0456° / 40°

56 °

SeaTac, Wednesday, 4 November

Clear. High 56°, low 40°.

Pressure29.97 inHg

Wind6.4 mph S

Humidity86%

Visibility—

Dew point42°

Thu, 0557° / 43°

0.17

57 °

SeaTac, Thursday, 5 November

Light rain. High 57°, low 43°.

Pressure30.03 inHg

Wind18.1 mph SW

Humidity76%

Visibility—

Dew point43°

Fri, 0656° / 47°

0.03

56 °

SeaTac, Friday, 6 November

Light rain. High 56°, low 47°.

Pressure30.09 inHg

Wind12.9 mph SW

Humidity72%

Visibility—

Dew point43°

Sat, 0751° / 48°

0.13

51 °

SeaTac, Saturday, 7 November

Light rain. High 51°, low 48°.

Pressure30.15 inHg

Wind3.6 mph SE

Humidity82%

Visibility—

Dew point43°

Sun, 0862° / 49°

0.53

62 °

SeaTac, Sunday, 8 November

Rain. High 62°, low 49°.

Pressure30.00 inHg

Wind17.2 mph S

Humidity86%

Visibility—

Dew point50°

Mon, 0956° / 43°

56 °

SeaTac, Monday, 9 November

Clear. High 56°, low 43°.

Pressure30.24 inHg

Wind6.9 mph N

Humidity75%

Visibility—

Dew point41°

Tue, 1056° / 48°

56 °

SeaTac, Tuesday, 10 November

Overcast. High 56°, low 48°.

Pressure29.85 inHg

Wind5.7 mph SE

Humidity58%

Visibility—

Dew point37°

Wed, 1156° / 49°

0.08

56 °

SeaTac, Wednesday, 11 November

Light rain. High 56°, low 49°.

Pressure29.97 inHg

Wind11.6 mph SW

Humidity89%

Visibility—

Dew point48°

Thu, 1255° / 47°

2.21

55 °

SeaTac, Thursday, 12 November

Heavy rain. High 55°, low 47°.

Pressure29.91 inHg

Wind8.1 mph SW

Humidity95%

Visibility—

Dew point47°

Fri, 1361° / 57°

1.78

61 °

SeaTac, Friday, 13 November

Heavy rain. High 61°, low 57°.

Pressure29.74 inHg

Wind17.4 mph S

Humidity89%

Visibility—

Dew point56°

Sat, 1458° / 46°

0.57

58 °

SeaTac, Saturday, 14 November

Rain. High 58°, low 46°.

Pressure30.03 inHg

Wind16.3 mph SW

Humidity78%

Visibility—

Dew point43°

Sun, 1556° / 43°

56 °

SeaTac, Sunday, 15 November

Overcast. High 56°, low 43°.

Pressure30.06 inHg

Wind3.3 mph SW

Humidity59%

Visibility—

Dew point35°

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

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)

Sat, 2845° / 36°

0.2

45 °

SeaTac, Saturday, 28 November

Climate normal for this date — 60-year average.

Average high45°

Average low36°

Average precipitation0.2 in

Chance of precipitation58%

Record high57° (2021)

Record low17° (1985)

Sun, 2945° / 35°

0.21

45 °

SeaTac, Sunday, 29 November

Climate normal for this date — 60-year average.

Average high45°

Average low35°

Average precipitation0.21 in

Chance of precipitation52%

Record high56° (2021)

Record low8° (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.