yearsofweather

Honolulu in September:
very hot, little rain

Honolulu, United States · Records from 2006 to 2025. Not a forecast.

Mean high31°Hottest day 34.2° (2014)
Mean low24°Coldest night 20.8° (2011)
Rain days3 days0-8 by year
Rainfall19mmDaylight 12.6 → 12.0 h
Honolulu's 12 months iBest: December to February
Trip types Beach Goodwarm seaSightseeing on foot Poorhot and muggy
Humidity72%24 muggy days
Clear days9 days2 overcast days
Mean wind16 km/hRarely windy
Sea temperature27°26.4-27.4° by year (last 6)
Sunrise / sunset (15th)06:18 / 18:35Daylight 12.6 → 12.0 h

Honolulu in September

The summer rush is over, so rates drop and the island is calmer. The sea is still warm and rain is modest. Hurricane season is not finished, so keep an eye on tropical storm news. It is one of the most comfortable times of the year to get in the water.

Highs averaged 31°C and lows stayed at 24°C, so the heat hung on long after sunset. Rain was rare: 3 rain days on average. 2 of 20 years had a completely dry September, while 2007 reached 8 rain days.

28 days past 30°C made it a month for early starts and a long lunch indoors.

Hurricanes i

3 of the last 20 years had a tropical storm pass within 300 km this month.

  • Olivia (2018), 89 km away tropical storm
  • Kiko (2025), 178 km away tropical storm
  • Lester (2016), 195 km away hurricane strength
1 2 3 4 5 6 17 38 39 110 11 12

Date by date i

‹ August September 2027 October ›
Sun
Mon
Tue
Wed
Thu
Fri
Sat
Week
1-4rain on 8% of days31° 24°
5-11rain on 11% of days32° 24°
12-18rain on 14% of days31° 24°
19-25rain on 9% of days31° 24°
26-30rain on 15% of days31° 24°

0-5/206-8/209-11/2012-20/20

1-4rain on 8% of days31° 24°
5-11rain on 11% of days32° 24°
12-18rain on 14% of days31° 24°
19-25rain on 9% of days31° 24°
26-30rain on 15% of days31° 24°
Tap another date to change

20063mm
20072mm
2008none
2009none
2010none
20115mm
2012none
2013none
20141mm
20154mm
201624mm
2017none
2018none
2019none
2020none
20211mm
2022none
2023none
2024none
2025none
Holidays in September (2027)
  • September 6 Labor Day

1 Local public holiday or break (busier, pricier)

Your trip dates, the past 20 years

Trip dates ~

You can also click two dates on the axis. Hover a cell to see that day's rain.
Trip rain days Month rain days
2006
1 d 3 d
2007
3 d 8 d
2008
0 d 4 d
2009
0 d 0 d
2010
0 d 1 d
2011
1 d 3 d
2012
2 d 5 d
2013
0 d 4 d
2014
0 d 3 d
2015
2 d 8 d
2016
2 d 7 d
2017
1 d 1 d
2018
1 d 7 d
2019
0 d 4 d
2020
0 d 0 d
2021
0 d 4 d
2022
0 d 2 d
2023
1 d 1 d
2024
1 d 1 d
2025
0 d 2 d
Years with rain
Tap a date to start, tap another to end. Each cell is that date in one year.
'06'07'08'09'10'11'12'13'14'15'16'17'18'19'20'21'22'23'24'25
of 20
1
2
2
1
2
1
2
1
1
3
5
3
1
2
7
1
2
3
1
2
0
1
1
1
7
2
3
5
2
3
Rain days on trip
13000120022110000110

No rain1-9 mm10 mm or more Dates outside your trip are dimmed.

One row per year, one cell per day. 2009 had 0 rain days, 2007 had 8.

Honolulu through the year

MonthHighLowRain daysRainfallSea
JanuaryGood 27°19°5 days35mm 25°
FebruaryGood 27°20°6 days49mm 25°
March 28°20°7 days61mm 25°
April 29°21°6 days36mm 25°
May 29°22°3 days26mm 25°
June 31°23°2 days16mm 26°
July 31°24°3 days15mm 26°
August 32°24°3 days28mm 27°
September 31°24°3 days19mm 27°
October 31°23°5 days36mm 27°
November 29°22°5 days44mm 27°
DecemberGood 28°21°6 days71mm 26°

Common questions

Does it rain a lot in Honolulu in September?

Over the past 20 years September averaged 3 rain days (1 mm or more) out of 30. Individual years ran from 0 in the driest to 8 in the wettest.

What should I wear in Honolulu in September?

Days averaged 31°C and nights 24°C. Pack T-shirts, sunscreen plus a hat, a swimsuit, and insect repellent.

Can you swim in Honolulu in September?

Sea surface temperature averaged 27°C in September, warm enough to stay in for a long swim. Year to year it ranged 26.4-27.4°C. Check local flags for waves and jellyfish on the day.

Is September a good time to visit Honolulu?

On warmth and rain days alone, Honolulu's easiest months were December to February. September ranked 11 of 12.

Is Honolulu humid in September?

Mean relative humidity was 72%, with about 24 muggy days (dew point of 20°C or more) in the month.