Avg High
Honolulu in September
Verdict
In Honolulu, September has a distinct autumn feel. As the season moves along, conditions remain fairly consistent. You can usually expect a warm month that feels variable day to day. Breezes can be part of the character, especially in exposed spots.
Well suited to visitors who prefer a steady feel over dramatic shifts. A breeze can shift the feel of the day, especially later on.
Avg Low
Rain
Daylight
12h
What to expect
- Daytime feel - Heat-forward afternoons that stay fairly consistent through the day. It can feel warmer than expected in the sun.
- Rain pattern - Generally dry. Rain is usually intermittent rather than relentless. Outdoor plans benefit from flexibility.
- Sun & UV - Very high UV is common. You can burn surprisingly quickly, so sun protection is strongly recommended. Shade breaks feel genuinely worthwhile.
- Exposure - Often breezy, and expect sharp gusts that can change plans in exposed areas. A light outer layer helps when you’re in the shade.
September in context
How it compares to the rest of the year in Honolulu.
Hottest (avg)
#1 / 12
Wettest (avg)
#12 / 12
Daylight Hours
#6 / 12
Windiest (avg)
#7 / 12
Highest UV
#6 / 12
Most Humid
#8 / 12
Temperature
- Daytime high
-
- Nighttime low
-
- Feels like (avg)
-
Sunshine
- Daylight
- 12.3 hours
- UV index (max)
- 9
- Typical sun hours
- 06:18 – 18:33
Rain & Snow
- Total
-
- Rainy days
- 13
- Cloud cover
- 41%
- Snowfall
-
Humidity & Wind
- Humidity (avg)
- 73%
- Wind (avg)
-
- Wind (max gusts)
-
Frequently asked questions
Is September a good time to visit Honolulu?
Typical September days in Honolulu reach highs of 28°C (82°F) with nights around 24°C (75°F). It usually feels hot by day and warm after dark. It is one of the drier months, which suits outdoor exploring and sightseeing.
What are temperatures like in September?
In September, you can usually expect highs of 28°C (82°F) and lows near 24°C (75°F). That means hot days and warm nights, so pack layers you can add or remove.
How much does it rain in September?
Rainfall in September averages 20 mm (0.79 in) across roughly 13 days. Overall it is a quite rainy time of year, so a light rain jacket and waterproof shoes are very handy.
How many hours of daylight are there in September?
You can expect about 12 hours of daylight in September. Sunrise is typically around 06:18 and sunset near 18:33. Daylight is fairly typical, with enough time for sightseeing.
How strong is the sun in September?
UV levels frequently reach very high levels (around 9), so strong sun protection is essential, especially around midday.
Is it windy in September?
In September, average wind speeds are around 17 km/h (11 mph), with gusts on the windiest days reaching about 55 km/h (34 mph). On the ground, it is it can feel quite windy at times, particularly when weather systems move through.