Olympia, WA

Washington · Records since 1948–2026

☁️ 62°F
Currently in Olympia
As of 11:30 AM PDT

Records for September 11

🔥 Record High

91°F

September 11, 2013

+17° from 74° normal

❄ Record Low

34°F

September 11, 1988

-13° from 47° normal
🌞 Normal high: 74°F 🌑 Normal low: 47°F 1991–2020 normals

All-Time Records — Olympia

🔥
110°F
Hottest Day Ever
Jun 28, 2021
❄
-8°F
Coldest Day Ever
Jan 1, 1979
🌧
4.82"
Wettest Day Ever
Jan 7, 2009
☃
14.2"
Most Snow in One Day
Jan 24, 1972

First & Last Dates — Olympia

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)
209 days
Longest growing season
2014
97 days
Shortest growing season
1973
162 days
Normal growing season
1991–2020 average

Top 10 Record Highs — September 11

# Temp Date
🏆 91°F September 11, 2013
2 88°F September 11, 2011
3 87°F September 11, 2007
4 86°F September 11, 2009
5 86°F September 11, 1969
6 85°F September 11, 1960
7 85°F September 11, 1957
8 84°F September 11, 1989
9 83°F September 11, 2015
10 83°F September 11, 1975

Top 5 Record Lows — September 11

# Temp Date
🥶 34°F September 11, 1988
2 36°F September 11, 2012
3 36°F September 11, 1964
4 37°F September 11, 2014
5 37°F September 11, 1949
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 1948–2026. Climate normals represent the 1991–2020 average.

Heat Wave Summary — Olympia

threshold: 87°F (90th percentile of historical Jun–Aug highs)
4.0
Avg heat wave length
days (historical)
95°
Avg peak temp
during heat waves
0
Dangerous nights 2026
Overnights ≥ 70°F
0
Heat waves 2026
so far

Days ≥ 90°F Per Year

1948–2026
7
2026 so far
7
Avg/year 1970–2025
10
Avg/year (last 10 complete)
18
Most in a year (1967)

Average Daily High by Decade

Full year · complete decades only

Longest Heat Waves — Olympia

# Dates Days Peak Avg High Avg Overnight Low
🏆 Aug 6, 1981 – Aug 14, 1981 9 104°F (Aug 9) 96°F 57°F
2 Jul 25, 2009 – Aug 2, 2009 9 104°F (Jul 29) 94°F 58°F
3 Aug 12, 1967 – Aug 20, 1967 9 96°F (Aug 16) 92°F 51°F
4 Jul 22, 2018 – Jul 30, 2018 9 95°F (Jul 29) 91°F 52°F
5 Jul 25, 2022 – Jul 31, 2022 7 99°F (Jul 30) 96°F 57°F
6 Jun 29, 2015 – Jul 5, 2015 7 96°F (Jul 2) 92°F 54°F
7 Jul 22, 1962 – Jul 28, 1962 7 94°F (Jul 23) 91°F 52°F
8 Jul 5, 2024 – Jul 10, 2024 6 100°F (Jul 9) 95°F 53°F
9 Jul 23, 1958 – Jul 28, 1958 6 99°F (Jul 27) 93°F 55°F
10 Jul 31, 2017 – Aug 5, 2017 6 96°F (Aug 3) 90°F 52°F

Heat Waves Per Year

Warm Summer Nights (Jun–Aug)

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

47
2026 total
above-normal nights
39.0
Avg / summer
1970–2020
66
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 (1948–2026)

Blue = above average · tan = below average · gold = 2026 (partial)
Since 1948, annual totals have trended -0.40" per decade, about -3.0" 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 Olympia is tracking against normal, year to date

Daily High Temperature vs Normal

Above normal Below normal

129 of 253 days with data were above the 1991–2020 normal high for their date.

Precipitation, Year to Date

24.50"
2026 YTD
Normal: 27.99"
-3.49"
0.35"
September so far
September normal: 2.04"
-1.69"
6
2026 heavy rain days
Days with ≥ 1.0"

Accumulation vs. Normal

Running total since Jan 1 against the normal pace for the same date · Olympia is 3.49" behind the normal pace

Period Review — Sep 1 – Nov 30, 2026

Any window, evaluated against every other year on record — 91 days

Quick picks: Last 7 days Last 30 days Last 90 days This month
Seasons: Spring (Mar–May) Summer (Jun–Aug) Fall (Sep–Nov)
2026 is still under way for this window — totals and rankings appear once November 30 passes.

Average Temperature by Year — Sep 1 – Nov 30

1948–2025 · 2026 highlighted · trend +0.17° per decade (warming since 1948)

Precipitation by Year — Sep 1 – Nov 30

1948–2024 · 2026 highlighted · trend -0.02" per decade (drier since 1948)

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.
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