September weather forecast and climate
Lanai City, HI

Average temperature in September - Lanai City, HI
  • Average high temperature in September: 78.5°F

The warmest month (with the highest average high temperature) is September (78.5°F).
The month with the lowest average high temperature is January (72°F).

  • Average low temperature in September: 65.8°F

The month with the highest average low temperature is August (66.1°F).
The coldest month (with the lowest average low temperature) is February (59.2°F).

Average rainfall in September - Lanai City, HI
  • Average rainfall in September: 1"

The wettest month (with the highest rainfall) is January (4.4").
The driest month (with the lowest rainfall) is August (0.1").

Average rainfall days in September - Lanai City, HI
  • Average rainfall days in September: 2.4 days

The month with the highest number of rainy days is December (7.8 days).
The month with the lowest number of rainy days is June (1.1 days).

Average sea temperature in September - Lanai City, HI
  • Average sea temperature in September: 81°F

Best months for swimming (with the highest average sea temperature) are September and October (81°F).
Coldest months (with the lowest average sea temperature) are January, February, March and April (75°F).

Average daylight in September / Average sunshine in September - Lanai City, HI
  • Average daylight in September: 12.3h

The month with the longest days is June (Average daylight: 13.4h).
The month with shortest days is December (Average daylight: 10.9h).

  • Average sunshine in September: 9h

Months with most sunshine are June, July, August and September (Average sunshine: 9h).
Months with least sunshine are January, February, November and December (Average sunshine: 7).

Average UV index in September - Lanai City, HI
  • Average UV index in September: 11

Months with the highest UV index are June, July and August (UV index 12).
The month with the lowest UV index is December (UV index 6).

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