As of 01:19 PDT

Weather in Sumner, WA

54°

Sumner, Wednesday, 7 October, 01:19

Overcast. Feels like 53°. High 72°, low 52°.

Pressure30.12 inHg

Wind2 mph N

Humidity94%

Visibility5.7 mi

Dew point52°

See detailed hourly forecast

Monthly outlook for Sumner, WA: average high 64.8°, average low 47.1°. That is 3.2° above the climate normal for October. Precipitation is expected on 3 days (about 0.3 inches), against a normal of 7 days and 2.4 inches. The warmest day looks like 8 October (73.7°), the coolest 15 October (41.5°).

64.8°/47.1°

Average high / low

+3.2°

Above normal

3 / 7

Wet days / normal

0.3 in

Precipitation this month

Ten-day blocks vs climate normal

Period	Forecast high	Normal	Difference
7 October – 16 October	65.1°	60°	+2.8°
17 October – 26 October	64.4°	56.8°	+4.2°
27 October – 5 November	at normal	53.1°	—

October records over 66 years

85.8°1 October 1987All-time high

24.8°28 October 1971All-time low

Climate normals and records are computed from the nearest reference point — Federal Way (8 mi).

Thu, 0874° / 49°

74 °

Sumner, Thursday, 8 October

Overcast. High 74°, low 49°.

Pressure30.06 inHg

Wind1.6 mph W

Humidity74%

Visibility5.1 mi

Dew point55°

Fri, 0962° / 52°

0.08

62 °

Sumner, Friday, 9 October

Light rain. High 62°, low 52°.

Pressure29.77 inHg

Wind14.2 mph SW

Humidity91%

Visibility4.5 mi

Dew point54°

Sat, 1057° / 50°

0.08

57 °

Sumner, Saturday, 10 October

Light rain. High 57°, low 50°.

Pressure29.83 inHg

Wind6.3 mph S

Humidity72%

Visibility4.0 mi

Dew point47°

Sun, 1164° / 46°

64 °

Sumner, Sunday, 11 October

Clear. High 64°, low 46°.

Pressure30.06 inHg

Wind10.1 mph N

Humidity64%

Visibility—

Dew point44°

Mon, 1267° / 42°

67 °

Sumner, Monday, 12 October

Clear. High 67°, low 42°.

Pressure30.06 inHg

Wind5.2 mph N

Humidity53%

Visibility—

Dew point40°

Tue, 1356° / 43°

0.01

56 °

Sumner, Tuesday, 13 October

Light rain. High 56°, low 43°.

Pressure29.94 inHg

Wind3.6 mph S

Humidity45%

Visibility—

Dew point33°

Wed, 1461° / 45°

0.01

61 °

Sumner, Wednesday, 14 October

Light rain. High 61°, low 45°.

Pressure30.27 inHg

Wind6.3 mph N

Humidity80%

Visibility—

Dew point47°

Thu, 1567° / 41°

67 °

Sumner, Thursday, 15 October

Clear. High 67°, low 41°.

Pressure30.33 inHg

Wind6.9 mph N

Humidity44%

Visibility—

Dew point34°

Fri, 1671° / 46°

71 °

Sumner, Friday, 16 October

Overcast. High 71°, low 46°.

Pressure30.30 inHg

Wind2.6 mph W

Humidity34%

Visibility—

Dew point29°

Sat, 1768° / 47°

68 °

Sumner, Saturday, 17 October

Overcast. High 68°, low 47°.

Pressure30.21 inHg

Wind5.2 mph N

Humidity37%

Visibility—

Dew point32°

Sun, 1868° / 49°

68 °

Sumner, Sunday, 18 October

Overcast. High 68°, low 49°.

Pressure30.09 inHg

Wind4.8 mph W

Humidity45%

Visibility—

Dew point37°

Mon, 1968° / 46°

68 °

Sumner, Monday, 19 October

Overcast. High 68°, low 46°.

Pressure30.12 inHg

Wind3.3 mph NW

Humidity48%

Visibility—

Dew point39°

Tue, 2058° / 53°

0.14

58 °

Sumner, Tuesday, 20 October

Light rain. High 58°, low 53°.

Pressure30.18 inHg

Wind4.1 mph W

Humidity91%

Visibility—

Dew point52°

Wed, 2164° / 46°

64 °

Sumner, Wednesday, 21 October

Partly cloudy. High 64°, low 46°.

Pressure30.30 inHg

Wind6.8 mph N

Humidity77%

Visibility—

Dew point47°

Thu, 2261° / 46°

61 °

Sumner, Thursday, 22 October

Mostly clear. High 61°, low 46°.

Pressure30.12 inHg

Wind2.6 mph NW

Humidity40%

Visibility—

Dew point34°

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

Fri, 2357° / 44°

0.15

57 °

Sumner, Friday, 23 October

Climate normal for this date — 60-year average.

Average high57°

Average low44°

Average precipitation0.15 in

Chance of precipitation48%

Record high70° (1965)

Record low36° (2020)

Sat, 2456° / 43°

0.2

56 °

Sumner, Saturday, 24 October

Climate normal for this date — 60-year average.

Average high56°

Average low43°

Average precipitation0.2 in

Chance of precipitation50%

Record high70° (1965)

Record low35° (1983)

Sun, 2555° / 44°

0.2

55 °

Sumner, Sunday, 25 October

Climate normal for this date — 60-year average.

Average high55°

Average low44°

Average precipitation0.2 in

Chance of precipitation53%

Record high68° (1965)

Record low35° (1969)

Mon, 2654° / 43°

0.25

54 °

Sumner, Monday, 26 October

Climate normal for this date — 60-year average.

Average high54°

Average low43°

Average precipitation0.25 in

Chance of precipitation52%

Record high68° (1965)

Record low32° (1970)

Tue, 2755° / 42°

0.21

55 °

Sumner, Tuesday, 27 October

Climate normal for this date — 60-year average.

Average high55°

Average low42°

Average precipitation0.21 in

Chance of precipitation40%

Record high65° (1968)

Record low29° (1970)

Wed, 2854° / 42°

0.24

54 °

Sumner, Wednesday, 28 October

Climate normal for this date — 60-year average.

Average high54°

Average low42°

Average precipitation0.24 in

Chance of precipitation58%

Record high68° (1962)

Record low25° (1971)

Thu, 2953° / 42°

0.19

53 °

Sumner, Thursday, 29 October

Climate normal for this date — 60-year average.

Average high53°

Average low42°

Average precipitation0.19 in

Chance of precipitation47%

Record high68° (1962)

Record low27° (1971)

Fri, 3053° / 42°

0.21

53 °

Sumner, Friday, 30 October

Climate normal for this date — 60-year average.

Average high53°

Average low42°

Average precipitation0.21 in

Chance of precipitation55%

Record high62° (1987)

Record low27° (1991)

Sat, 3153° / 42°

0.29

53 °

Sumner, Saturday, 31 October

Climate normal for this date — 60-year average.

Average high53°

Average low42°

Average precipitation0.29 in

Chance of precipitation58%

Record high64° (1964)

Record low28° (2002)

Sun, 0153° / 41°

0.24

53 °

Sumner, Sunday, 1 November

Climate normal for this date — 60-year average.

Average high53°

Average low41°

Average precipitation0.24 in

Chance of precipitation57%

Record high66° (1969)

Record low28° (2002)

Mon, 0253° / 41°

0.2

53 °

Sumner, Monday, 2 November

Climate normal for this date — 60-year average.

Average high53°

Average low41°

Average precipitation0.2 in

Chance of precipitation60%

Record high66° (1962)

Record low28° (1973)

Tue, 0353° / 42°

0.28

53 °

Sumner, Tuesday, 3 November

Climate normal for this date — 60-year average.

Average high53°

Average low42°

Average precipitation0.28 in

Chance of precipitation60%

Record high64° (2010)

Record low29° (2003)

Wed, 0453° / 42°

0.32

53 °

Sumner, Wednesday, 4 November

Climate normal for this date — 60-year average.

Average high53°

Average low42°

Average precipitation0.32 in

Chance of precipitation60%

Record high66° (1980)

Record low27° (2003)

Thu, 0552° / 41°

0.19

52 °

Sumner, Thursday, 5 November

Climate normal for this date — 60-year average.

Average high52°

Average low41°

Average precipitation0.19 in

Chance of precipitation62%

Record high64° (1997)

Record low25° (2003)

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 Sumner, 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 Sumner, 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.