Honolulu, HI

Hawaii · Records since 1940–2026

☀️ 78°F
Currently in Honolulu
As of 8:00 AM HST

Records for September 11

🔥 Record High

92°F

September 11, 2019

+4° from 88° normal

❄ Record Low

68°F

September 11, 1985

-7° from 75° normal
🌞 Normal high: 88°F 🌑 Normal low: 75°F 1991–2020 normals

All-Time Records — Honolulu

🔥
95°F
Hottest Day Ever
Aug 31, 2019
❄
52°F
Coldest Day Ever
Jan 20, 1969
🌧
15.32"
Wettest Day Ever
Mar 5, 1958
☃
0.0"
Most Snow in One Day
Nov 30, 2020

First & Last Dates — Honolulu

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)

Top 10 Record Highs — September 11

# Temp Date
🏆 92°F September 11, 2019
2 92°F September 11, 1984
3 92°F September 11, 1979
4 92°F September 11, 1966
5 91°F September 11, 2025
6 91°F September 11, 2001
7 91°F September 11, 1997
8 91°F September 11, 1994
9 91°F September 11, 1986
10 91°F September 11, 1968

Top 5 Record Lows — September 11

# Temp Date
🥶 68°F September 11, 1985
2 69°F September 11, 1973
3 70°F September 11, 1981
4 70°F September 11, 1972
5 71°F September 11, 1995
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 1940–2026. Climate normals represent the 1991–2020 average.

Heat Wave Summary — Honolulu

threshold: 90°F (90th percentile of historical Jun–Aug highs)
5.9
Avg heat wave length
days (historical)
91°
Avg peak temp
during heat waves
191
Dangerous nights 2026
Overnights ≥ 70°F
1
Heat waves 2026
so far

Days ≥ 90°F Per Year

1940–2026
12
2026 so far
30
Avg/year 1970–2025
31
Avg/year (last 10 complete)
116
Most in a year (1995)

Average Daily High by Decade

Full year · complete decades only

Longest Heat Waves — Honolulu

# Dates Days Peak Avg High Avg Overnight Low
🏆 Aug 26, 1995 – Oct 5, 1995 41 93°F (Sep 5) 91°F 76°F
2 Aug 10, 2019 – Sep 15, 2019 37 95°F (Aug 31) 92°F 78°F
3 Jul 27, 1994 – Aug 24, 1994 29 93°F (Aug 13) 91°F 78°F
4 Jul 31, 1970 – Aug 25, 1970 26 92°F (Aug 10) 90°F 77°F
5 Aug 19, 1987 – Sep 10, 1987 23 94°F (Sep 5) 92°F 75°F
6 Aug 7, 1996 – Aug 29, 1996 23 93°F (Aug 24) 91°F 75°F
7 Aug 5, 2005 – Aug 24, 2005 20 92°F (Aug 8) 91°F 77°F
8 Aug 22, 1986 – Sep 8, 1986 18 94°F (Sep 4) 92°F 75°F
9 Jul 28, 1969 – Aug 13, 1969 17 92°F (Jul 28) 91°F 77°F
10 Aug 15, 1968 – Aug 30, 1968 16 92°F (Aug 16) 91°F 75°F

Heat Waves Per Year

Warm Summer Nights (Jun–Aug)

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

58
2026 total
above-normal nights
26.2
Avg / summer
1970–2020
76
Most in a summer
2005

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 (1940–2026)

Blue = above average · tan = below average · gold = 2026 (partial)
Since 1940, annual totals have trended -0.83" per decade, about -7.1" 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 Honolulu is tracking against normal, year to date

Daily High Temperature vs Normal

Above normal Below normal

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

Precipitation, Year to Date

22.35"
2026 YTD
Normal: 9.93"
+12.42"
0.32"
September so far
September normal: 0.88"
-0.56"
5
2026 heavy rain days
Days with ≥ 1.0"

Accumulation vs. Normal

Running total since Jan 1 against the normal pace for the same date · Honolulu is 12.42" ahead of the normal pace

Period Review — Aug 11 – Sep 10, 2026

Any window, evaluated against every other year on record — 31 days

Quick picks: Last 7 days Last 30 days Last 90 days This month
Seasons: Spring (Mar–May) Summer (Jun–Aug) Fall (Sep–Nov)
82.4°F
Average temperature
22nd-warmest of 83
+0.2°
vs. average
Normal: 82.2°F (1991–2020)
1.23"
Precipitation
8th-wettest of 85
+0.41"
vs. average
Normal: 0.82" · 150% of normal

Average Temperature by Year — Aug 11 – Sep 10

1940–2026 · 2026 highlighted · trend +0.35° per decade (warming since 1940)

Precipitation by Year — Aug 11 – Sep 10

1940–2026 · 2026 highlighted · trend +0.06" per decade (wetter since 1940)

Warmest Aug 11 – Sep 10 on Record

# Year Avg Temp
1 2019 85.2°F
2 1994 84.5°F
3 2020 83.2°F
4 2005 83.2°F
5 1987 83.1°F
6 2015 83.1°F
7 1986 83.0°F
8 1995 83.0°F
9 2003 83.0°F
10 2004 83.0°F

Coolest Aug 11 – Sep 10 on Record

# Year Avg Temp
1 1955 76.7°F
2 1944 79.0°F
3 1952 79.1°F
4 1965 79.1°F
5 1950 79.1°F
6 1953 79.2°F
7 1956 79.3°F
8 1954 79.5°F
9 1958 79.7°F
10 1951 79.8°F

Wettest Aug 11 – Sep 10 on Record

# Year Total
1 2015 8.60"
2 1996 2.54"
3 1982 2.45"
4 2017 1.94"
5 2016 1.85"
6 1947 1.70"
7 1974 1.63"
8 2026 1.23"
9 1972 1.19"
10 1950 1.13"

Driest Aug 11 – Sep 10 on Record

# Year Total
1 1946 0.02"
2 1944 0.02"
3 1963 0.03"
4 1953 0.03"
5 2001 0.05"
6 2019 0.07"
7 1999 0.08"
8 1977 0.08"
9 1991 0.09"
10 1980 0.09"
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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