Measurements:
°C
°F
CURRENT WEATHER
05:08
Oahu
74°F
SW 4 mph
Feels like: 74°F
Precip: 33%
World Resorts USA Oahu Weather

7 Day Weather Forecast

09.15
tue
DAY
84°F
W 7 mph
precip
13%
NIGHT
76°F
W 4 mph
precip
23%
09.16
wed
DAY
84°F
SW 11 mph
precip
17%
NIGHT
76°F
SW 9 mph
precip
32%
09.17
thu
DAY
82°F
W 11 mph
precip
26%
NIGHT
76°F
W 8 mph
precip
43%
09.18
fri
DAY
84°F
W 14 mph
precip
3%
NIGHT
74°F
W 9 mph
precip
25%
09.19
sat
DAY
82°F
W 11 mph
precip
16%
NIGHT
76°F
W 9 mph
precip
24%
09.20
sun
DAY
82°F
W 14 mph
precip
5%
NIGHT
74°F
W 9 mph
precip
19%
09.21
mon
DAY
80°F
W 13 mph
precip
22%
NIGHT
76°F
W 11 mph
precip
34%

Oahu Sea Water Temperature in September, °F

Select Year: 2026 2025 2024

The average sea surface temperature in September 2026 for Oahu was 26.8°F. The maximum and minimum values were 26.3°F and 27.1°F respectively.

Oahu on the Weather Map

Best Time to Visit Oahu
The most sunny months:
January 8 days
September 6 days
August 5 days
The most warm months:
September 85.9 °F
August 85.3 °F
July 84.5 °F
Warmest sea temperature:
October 83.5 °F
September 83.4 °F
August 82.9 °F
The most cold months:
February 77.5 °F
March 78.5 °F
January 78.8 °F
The most rainy months:
March 1 day
April 1 day
December 1 day
The most windy months:
July 12 mph
May 11 mph
June 11 mph
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