As of 15:40 PDT

Weather in SeaTac, WA

61°

SeaTac, Saturday, 17 October, 15:40

Overcast. Feels like 60°. High 61°, low 51°.

Pressure30.21 inHg

Wind11.5 mph NE

Humidity64%

Visibility6.2 mi

Dew point49°

See detailed hourly forecast

Monthly outlook for SeaTac, WA: average high 56.8°, average low 44.9°. That is 0.8° above the climate normal for October. Precipitation is expected on 7 days (about 1.9 inches), against a normal of 8 days and 3.3 inches. The warmest day looks like 25 October (64°), the coolest 18 October (41°).

56.8°/44.9°

Average high / low

+0.8°

Above normal

7 / 8

Wet days / normal

1.9 in

Precipitation this month

Ten-day blocks vs climate normal

Period	Forecast high	Normal	Difference
17 October – 26 October	59.2°	56.6°	+1.5°
27 October – 5 November	52.8°	53°	-0.1°
6 November – 15 November	at normal	50.5°	—

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, 1857° / 41°

57 °

SeaTac, Sunday, 18 October

Overcast. High 57°, low 41°.

Pressure30.15 inHg

Wind6.3 mph N

Humidity70%

Visibility6.2 mi

Dew point45°

Mon, 1958° / 42°

58 °

SeaTac, Monday, 19 October

Clear. High 58°, low 42°.

Pressure30.00 inHg

Wind1.7 mph SW

Humidity67%

Visibility6.2 mi

Dew point45°

Tue, 2058° / 47°

58 °

SeaTac, Tuesday, 20 October

Mostly clear. High 58°, low 47°.

Pressure30.09 inHg

Wind10.4 mph N

Humidity75%

Visibility6.2 mi

Dew point47°

Wed, 2160° / 43°

60 °

SeaTac, Wednesday, 21 October

Partly cloudy. High 60°, low 43°.

Pressure29.94 inHg

Wind1.6 mph NW

Humidity72%

Visibility2.4 mi

Dew point47°

Thu, 2251° / 43°

0.2

51 °

SeaTac, Thursday, 22 October

Light rain. High 51°, low 43°.

Pressure30.00 inHg

Wind6.6 mph S

Humidity85%

Visibility—

Dew point43°

Fri, 2358° / 42°

58 °

SeaTac, Friday, 23 October

Partly cloudy. High 58°, low 42°.

Pressure30.21 inHg

Wind5.1 mph N

Humidity64%

Visibility—

Dew point39°

Sat, 2459° / 45°

59 °

SeaTac, Saturday, 24 October

Overcast. High 59°, low 45°.

Pressure30.12 inHg

Wind5.8 mph N

Humidity60%

Visibility—

Dew point38°

Sun, 2564° / 45°

64 °

SeaTac, Sunday, 25 October

Overcast. High 64°, low 45°.

Pressure30.06 inHg

Wind5.7 mph N

Humidity48%

Visibility—

Dew point34°

Mon, 2664° / 48°

64 °

SeaTac, Monday, 26 October

Overcast. High 64°, low 48°.

Pressure29.83 inHg

Wind1.8 mph N

Humidity41%

Visibility—

Dew point32°

Tue, 2762° / 50°

62 °

SeaTac, Tuesday, 27 October

Overcast. High 62°, low 50°.

Pressure29.68 inHg

Wind5.6 mph SW

Humidity49%

Visibility—

Dew point37°

Wed, 2857° / 48°

0.07

57 °

SeaTac, Wednesday, 28 October

Light rain. High 57°, low 48°.

Pressure29.65 inHg

Wind13 mph S

Humidity55%

Visibility—

Dew point37°

Thu, 2955° / 45°

0.23

55 °

SeaTac, Thursday, 29 October

Light rain. High 55°, low 45°.

Pressure29.80 inHg

Wind16.9 mph SW

Humidity64%

Visibility—

Dew point40°

Fri, 3048° / 42°

0.67

48 °

SeaTac, Friday, 30 October

Rain. High 48°, low 42°.

Pressure29.53 inHg

Wind12.5 mph S

Humidity89%

Visibility—

Dew point41°

Sat, 3147° / 42°

0.57

47 °

SeaTac, Saturday, 31 October

Rain. High 47°, low 42°.

Pressure29.38 inHg

Wind20.5 mph S

Humidity78%

Visibility—

Dew point38°

Sun, 0148° / 44°

0.06

48 °

SeaTac, Sunday, 1 November

Light rain. High 48°, low 44°.

Pressure30.00 inHg

Wind12.5 mph S

Humidity80%

Visibility—

Dew point41°

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

Mon, 0253° / 41°

0.19

53 °

SeaTac, Monday, 2 November

Climate normal for this date — 60-year average.

Average high53°

Average low41°

Average precipitation0.19 in

Chance of precipitation57%

Record high66° (1962)

Record low28° (1973)

Tue, 0353° / 42°

0.26

53 °

SeaTac, Tuesday, 3 November

Climate normal for this date — 60-year average.

Average high53°

Average low42°

Average precipitation0.26 in

Chance of precipitation60%

Record high64° (2010)

Record low28° (1973)

Wed, 0453° / 42°

0.31

53 °

SeaTac, Wednesday, 4 November

Climate normal for this date — 60-year average.

Average high53°

Average low42°

Average precipitation0.31 in

Chance of precipitation58%

Record high65° (1980)

Record low28° (2003)

Thu, 0552° / 41°

0.19

52 °

SeaTac, Thursday, 5 November

Climate normal for this date — 60-year average.

Average high52°

Average low41°

Average precipitation0.19 in

Chance of precipitation55%

Record high63° (1997)

Record low25° (2003)

Fri, 0651° / 42°

0.28

51 °

SeaTac, Friday, 6 November

Climate normal for this date — 60-year average.

Average high51°

Average low42°

Average precipitation0.28 in

Chance of precipitation62%

Record high58° (1967)

Record low25° (2003)

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)

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.