Seattle City, WA

Washington · Records since 1894–2026

☁️ 60°F
Currently in Seattle City
As of 11:15 AM PDT

Records for September 11

🔥 Record High

89°F

September 11, 2013

+16° from 73° normal

❄ Record Low

44°F

September 11, 1906

-10° from 54° normal
🌞 Normal high: 73°F 🌑 Normal low: 54°F 1991–2020 normals

All-Time Records — Seattle City

🔥
107°F
Hottest Day Ever
Jun 28, 2021
❄
9°F
Coldest Day Ever
Dec 21, 1990
🌧
4.22"
Wettest Day Ever
Jan 18, 1986
☃
21.5"
Most Snow in One Day
Feb 2, 1916

First & Last Dates — Seattle City

How early and how late each seasonal turning point has ever arrived, across the full period of record

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Range ever recorded Normal date (1991–2020)
357 days
Longest growing season
1941
208 days
Shortest growing season
1911
251 days
Normal growing season
1991–2020 average

Top 10 Record Highs — September 11

# Temp Date
🏆 89°F September 11, 2013
2 86°F September 11, 2011
3 84°F September 11, 2009
4 83°F September 11, 2017
5 83°F September 11, 2007
6 83°F September 11, 1957
7 82°F September 11, 1960
8 81°F September 11, 1953
9 80°F September 11, 1975
10 80°F September 11, 1923

Top 5 Record Lows — September 11

# Temp Date
🥶 44°F September 11, 1906
2 45°F September 11, 1895
3 46°F September 11, 1988
4 46°F September 11, 1936
5 46°F September 11, 1904
About this data — Records are sourced from the NOAA Threadex dataset via RCC ACIS, a quality-controlled record for long-term climate stations. Threadex adjusts for station relocations and observation-time changes, making records comparable across all years since 1894–2026. Climate normals represent the 1991–2020 average.

Heat Wave Summary — Seattle City

threshold: 83°F (90th percentile of historical Jun–Aug highs)
4.1
Avg heat wave length
days (historical)
90°
Avg peak temp
during heat waves
0
Dangerous nights 2026
Overnights ≥ 70°F
3
Heat waves 2026
so far

Days ≥ 90°F Per Year

1895–2026
5
2026 so far
3
Avg/year 1970–2025
4
Avg/year (last 10 complete)
8
Most in a year (2015)

Average Daily High by Decade

Full year · complete decades only

Longest Heat Waves — Seattle City

# Dates Days Peak Avg High Avg Overnight Low
🏆 Aug 9, 1967 – Aug 20, 1967 12 94°F (Aug 16) 87°F 60°F
2 Jul 25, 2009 – Aug 3, 2009 10 105°F (Jul 29) 91°F 64°F
3 Jul 5, 2024 – Jul 14, 2024 10 97°F (Jul 9) 88°F 60°F
4 Jul 13, 1938 – Jul 22, 1938 10 92°F (Jul 21) 87°F 60°F
5 Aug 6, 1981 – Aug 14, 1981 9 94°F (Aug 8) 88°F 65°F
6 Jul 22, 2018 – Jul 30, 2018 9 92°F (Jul 26) 88°F 61°F
7 Jul 25, 2022 – Aug 1, 2022 8 94°F (Jul 26) 90°F 65°F
8 Jun 29, 2015 – Jul 6, 2015 8 92°F (Jul 2) 89°F 63°F
9 Jul 16, 1959 – Jul 22, 1959 7 93°F (Jul 22) 88°F 60°F
10 Jul 22, 1962 – Jul 28, 1962 7 90°F (Jul 27) 88°F 59°F

Heat Waves Per Year

Warm Summer Nights (Jun–Aug)

Nights where the overnight low exceeded the 1991–2020 normal low

49
2026 total
above-normal nights
39.8
Avg / summer
1970–2020
70
Most in a summer
1958

Above-Normal Summer Nights Per Year

Average June–August Low by Decade

Overnight lows · complete decades only

Precipitation

Annual totals and trend across the full period of record · see this year's standing →

Monthly Precipitation — Last 24 Months

Blue = actual · dashed line = monthly normal

Annual Precipitation Per Year (1894–2026)

Blue = above average · tan = below average · gold = 2026 (partial)
Since 1894, annual totals have trended +0.47" per decade, about +6.1" across the record.

Heavy Rain Days Per Year (≥ 1.0")

Compare year-to-year changes in days with heavy rainfall (≥ 1.0")

This Year — 2026

How Seattle City is tracking against normal, year to date

Daily High Temperature vs Normal

Above normal Below normal

147 of 252 days with data were above the 1991–2020 normal high for their date.

Precipitation, Year to Date

17.55"
2026 YTD
Normal: 21.54"
-3.99"
0.18"
September so far
September normal: 1.74"
-1.56"
0
2026 heavy rain days
Days with ≥ 1.0"

Accumulation vs. Normal

Running total since Jan 1 against the normal pace for the same date · Seattle City is 3.99" behind the normal pace

Period Review — Sep 3 – Sep 10, 2026

Any window, evaluated against every other year on record — 8 days

Quick picks: Last 7 days Last 30 days Last 90 days This month
Seasons: Spring (Mar–May) Summer (Jun–Aug) Fall (Sep–Nov)
64.3°F
Average temperature
48th-warmest of 132
+-0.0°
vs. average
Normal: 64.3°F (1991–2020)
0.04"
Precipitation
38th-driest of 132
-0.40"
vs. average
Normal: 0.44" · 9% of normal

Average Temperature by Year — Sep 3 – Sep 10

1894–2026 · 2026 highlighted · trend +0.40° per decade (warming since 1894)

Precipitation by Year — Sep 3 – Sep 10

1894–2026 · 2026 highlighted

Warmest Sep 3 – Sep 10 on Record

# Year Avg Temp
1 2017 70.1°F
2 2020 69.6°F
3 1944 69.0°F
4 2024 68.9°F
5 2011 68.8°F
6 1993 68.4°F
7 1949 67.9°F
8 1963 67.6°F
9 2025 67.4°F
10 2013 67.3°F

Coolest Sep 3 – Sep 10 on Record

# Year Avg Temp
1 1895 55.7°F
2 1897 56.2°F
3 1912 56.9°F
4 1928 57.0°F
5 1910 57.3°F
6 1914 57.3°F
7 1920 57.5°F
8 1901 57.8°F
9 1927 57.8°F
10 1913 58.2°F

Wettest Sep 3 – Sep 10 on Record

# Year Total
1 1978 2.28"
2 1931 2.18"
3 2013 2.15"
4 1906 1.97"
5 1911 1.91"
6 2019 1.61"
7 1992 1.58"
8 1897 1.49"
9 2009 1.31"
10 1913 1.19"

Driest Sep 3 – Sep 10 on Record

# Year Total
1 2024 0.00"
2 2021 0.00"
3 2020 0.00"
4 2017 0.00"
5 2008 0.00"
6 1997 0.00"
7 1993 0.00"
8 1990 0.00"
9 1989 0.00"
10 1987 0.00"
About this data. Pick any start and end date and this becomes the same kind of review as the Month and Fall tabs, just for exactly the window you asked for — the generalized version of the same engine, evaluated across every year on record. Average temperature is the mean of each day's (high + low) / 2; precipitation is the sum of daily totals. A year missing more than about a fifth of the window's days is excluded from the temperature ranking; any missing day excludes a year from the precipitation ranking, since an unreported day is unreported rain. Ranges that cross from December into January aren't supported yet. Normals are the 1991–2020 mean for the same window.
← Back to all stations