Hilo, HI

Hawaii · Records since 1949–2026

🌦️ 75°F Feels like 81°
Currently in Hilo
As of 8:30 AM HST

Records for September 11

🔥 Record High

91°F

September 11, 1992

+8° from 83° normal

❄ Record Low

64°F

September 11, 1970

-6° from 70° normal
🌞 Normal high: 83°F 🌑 Normal low: 70°F 1991–2020 normals

All-Time Records — Hilo

🔥
94°F
Hottest Day Ever
Nov 28, 2013
❄
53°F
Coldest Day Ever
Feb 21, 1962
🌧
16.87"
Wettest Day Ever
Feb 20, 1979
☃
0.0"
Most Snow in One Day
Nov 30, 2020

First & Last Dates — Hilo

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

Top 10 Record Highs — September 11

# Temp Date
🏆 91°F September 11, 1992
2 89°F September 11, 2018
3 88°F September 11, 2015
4 88°F September 11, 2014
5 88°F September 11, 1977
6 87°F September 11, 2022
7 87°F September 11, 2020
8 87°F September 11, 2013
9 87°F September 11, 1979
10 86°F September 11, 2024

Top 5 Record Lows — September 11

# Temp Date
🥶 64°F September 11, 1970
2 64°F September 11, 1955
3 65°F September 11, 2008
4 65°F September 11, 1971
5 65°F September 11, 1959
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 1949–2026. Climate normals represent the 1991–2020 average.

Heat Wave Summary — Hilo

threshold: 86°F (90th percentile of historical Jun–Aug highs)
5.6
Avg heat wave length
days (historical)
88°
Avg peak temp
during heat waves
103
Dangerous nights 2026
Overnights ≥ 70°F
1
Heat waves 2026
so far

Days ≥ 90°F Per Year

1950–2026
0
2026 so far
2
Avg/year 1970–2025
4
Avg/year (last 10 complete)
12
Most in a year (2015)

Average Daily High by Decade

Full year · complete decades only

Longest Heat Waves — Hilo

# Dates Days Peak Avg High Avg Overnight Low
🏆 Sep 11, 2014 – Oct 7, 2014 27 93°F (Sep 26) 88°F 71°F
2 Aug 8, 2019 – Sep 3, 2019 27 89°F (Aug 16) 88°F 73°F
3 Sep 19, 2019 – Oct 9, 2019 21 92°F (Sep 27) 88°F 74°F
4 Jun 27, 2015 – Jul 16, 2015 20 90°F (Jul 12) 87°F 72°F
5 Aug 25, 2015 – Sep 12, 2015 19 93°F (Sep 2) 90°F 73°F
6 Oct 28, 2019 – Nov 15, 2019 19 90°F (Nov 2) 87°F 71°F
7 Sep 30, 2020 – Oct 17, 2020 18 90°F (Oct 12) 88°F 70°F
8 Aug 30, 2004 – Sep 15, 2004 17 89°F (Sep 7) 87°F 70°F
9 Sep 3, 2013 – Sep 18, 2013 16 88°F (Sep 7) 87°F 69°F
10 Sep 28, 1996 – Oct 10, 1996 13 90°F (Oct 1) 88°F 68°F

Heat Waves Per Year

Warm Summer Nights (Jun–Aug)

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

70
2026 total
above-normal nights
30.0
Avg / summer
1970–2020
74
Most in a summer
2018

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 (1949–2026)

Blue = above average · tan = below average · gold = 2026 (partial)
Since 1949, annual totals have trended -2.15" per decade, about -16.4" 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 Hilo is tracking against normal, year to date

Daily High Temperature vs Normal

Above normal Below normal

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

Precipitation, Year to Date

114.71"
2026 YTD
Normal: 78.04"
+36.67"
6.47"
September so far
September normal: 8.70"
-2.23"
29
2026 heavy rain days
Days with ≥ 1.0"

Accumulation vs. Normal

Running total since Jan 1 against the normal pace for the same date · Hilo is 36.67" ahead of the normal pace

Period Review — Sep 1 – Sep 10, 2026

Any window, evaluated against every other year on record — 10 days

Quick picks: Last 7 days Last 30 days Last 90 days This month
Seasons: Spring (Mar–May) Summer (Jun–Aug) Fall (Sep–Nov)
78.0°F
Average temperature
10th-warmest of 77
+0.8°
vs. average
Normal: 77.2°F (1991–2020)
6.47"
Precipitation
2nd-wettest of 77
+4.01"
vs. average
Normal: 2.46" · 263% of normal

Average Temperature by Year — Sep 1 – Sep 10

1950–2026 · 2026 highlighted · trend +0.33° per decade (warming since 1950)

Precipitation by Year — Sep 1 – Sep 10

1950–2026 · 2026 highlighted · trend +0.03" per decade (wetter since 1950)

Warmest Sep 1 – Sep 10 on Record

# Year Avg Temp
1 2015 81.9°F
2 2019 79.9°F
3 2020 79.7°F
4 1994 78.7°F
5 1987 78.6°F
6 2018 78.6°F
7 2004 78.4°F
8 2014 78.4°F
9 1995 78.1°F
10 2026 78.0°F

Coolest Sep 1 – Sep 10 on Record

# Year Avg Temp
1 1955 73.3°F
2 1952 74.2°F
3 1999 74.3°F
4 1956 74.4°F
5 1953 74.6°F
6 1970 74.8°F
7 1960 74.9°F
8 1989 75.0°F
9 2009 75.0°F
10 1998 75.1°F

Wettest Sep 1 – Sep 10 on Record

# Year Total
1 1992 13.05"
2 2026 6.47"
3 2003 5.92"
4 1964 4.62"
5 1989 4.26"
6 2002 4.13"
7 1994 4.01"
8 1980 3.87"
9 1968 3.71"
10 1996 3.71"

Driest Sep 1 – Sep 10 on Record

# Year Total
1 1965 0.16"
2 2015 0.21"
3 2004 0.46"
4 1955 0.49"
5 1963 0.58"
6 2013 0.60"
7 1975 0.74"
8 1977 0.78"
9 1959 0.80"
10 2010 0.86"
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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