January weather forecastHaleiwa, HI
January
Weather in January
January, the same as December, is a moderately hot winter month in Haleiwa, Hawaii, with an average temperature ranging between min 70°F (21.1°C) and max 75.9°F (24.4°C).Temperature
With the onset of January, the average high-temperature stands at a still moderately hot 75.9°F (24.4°C), closely aligned with December's 76.6°F (24.8°C). The temperature in Haleiwa during January experiences a small drop from daytime peaks, recording an average of 70°F (21.1°C) at night.Humidity
The average relative humidity in January is 75%.Rainfall
In January, the rain falls for 12.5 days. Throughout January, 0.79" (20mm) of precipitation is accumulated. In Haleiwa, during the entire year, the rain falls for 190.2 days and collects up to 11.65" (296mm) of precipitation.Ocean temperature
In Haleiwa, in January, the average water temperature is 76.6°F (24.8°C).Note: Consideration of an individual's cold resistance, combined with conditions like sunshine, wind, and temperature, suggests that swimming in 76.6°F (24.8°C) water can be delightful. (Olympic swimming is usually in 77°F (25°C) to 82.4°F (28°C) water.)
Daylight
In January, the average length of the day in Haleiwa is 10h and 59min.On the first day of the month, sunrise is at 7:10 am and sunset at 6:01 pm. On the last day of January, sunrise is at 7:10 am and sunset at 6:21 pm HST.
Sunshine
The average sunshine in January in Haleiwa is 8.2h.UV index
The months with the lowest UV index are January through June, August, October through December, with an average maximum UV index of 6. A UV Index estimate of 6 to 7 represents a high health vulnerability from unsafe exposure to UV radiation for ordinary individuals.Note: A maximum UV index of 6 in January translates into the following recommendations:
Avoid excessive sunlight. Those with lighter skin may experience burning in less than 20 minutes. During the period from 10 a.m. to 4 p.m., UV radiation is highest. Try to avoid direct sunlight during these hours. Safeguard your eyes, ears, and face from sun rays with the aid of a wide-brim hat. Be on guard! The reflective nature of sand and water boosts UV exposure.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in January
Haleiwa, HI
- Average high temperature in January: 75.9°F
The warmest month (with the highest average high temperature) is September (81.7°F).
The month with the lowest average high temperature is February (75°F).
- Average low temperature in January: 70°F
The months with the highest average low temperature are August and September (75.7°F).
The coldest month (with the lowest average low temperature) is February (68.5°F).
Average pressure in January
Haleiwa, HI
- Average pressure in January: 30"Hg
The month with the highest atmospheric pressure is April (30.06"Hg).
The month with the lowest atmospheric pressure is October (29.97"Hg).
Average wind speed in January
Haleiwa, HI
- Average wind speed in January: 9mph
The windiest month (with the highest average wind speed) is July (11.6mph).
The calmest month (with the lowest average wind speed) is January (9mph).
Average humidity in January
Haleiwa, HI
- Average humidity in January: 75%
The months with the highest relative humidity are February and December (76%).
The months with the lowest relative humidity are May and September (74%).
Average rainfall in January
Haleiwa, HI
- Average rainfall in January: 0.79"
The wettest months (with the highest rainfall) are February and October (1.34").
The driest month (with the least rainfall) is July (0.63").
Average rainfall days in January
Haleiwa, HI
- Average rainfall days in January: 12.5 days
The month with the highest number of rainy days is March (17.7 days).
The month with the least rainy days is January (12.5 days).
Average sea temperature in January
Haleiwa, HI
- Average sea temperature in January: 76.6°F
The best month for swimming (with the highest average sea temperature) is September (80.2°F).
The coldest month (with the lowest average sea temperature) is March (75.2°F).
Average daylight in January /
Average sunshine in January
Haleiwa, HI
- Average daylight in January: 11h and 0min
The month with the longest days is June (Average daylight: 13h and 24min).
The month with the shortest days is December (Average daylight: 10h and 48min).
- Average sunshine in January: 8h and 12min
The month with the most sunshine is June (Average sunshine: 9h and 54min).
The month with the least sunshine is November (Average sunshine: 6h and 12min).
Average sunshine days in January
Haleiwa, HI
- Average sunshine days in January: 12.9 days
The month with the most sunshine days is January (12.9 days).
The month with the least sunshine days is September (6.5 days).
Average UV index in January
Haleiwa, HI
- Average UV index in January: 6
The months with the highest UV index are July and September (UV index 7).
The months with the lowest UV index are January, February, March, April, May, June, August, October, November and December (UV index 6).
Average cloud cover in January
Haleiwa, HI
- Average cloud cover in January: 37
The month with the most cloud cover is March (Cloud cover 44).
The months with the least cloud cover are January and September (Cloud cover 37).
Average visibility in January
Haleiwa, HI
- Average visibility in January: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
