Wailuku (HI) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Wailuku.
Climate overview of Wailuku
Wailuku, Hawaii, United States of America, has a stable climate with little temperature variation across the year. Average daytime temperatures hover around 28°C (82°F), peaking in August at 30°C (86°F) and dipping in February to 26°C (79°F).
With around 386 mm (15 in) of annual rainfall, Wailuku has a fairly dry climate. However, it has a distinct dry season from April to November. The wettest month is March, while June sees the least rain. Sunshine peaks in July, when the city sees around 9.8 hours of sunshine per day.
Wailuku Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Wailuku - and find the best time to visit.
Monthly Temperature in Wailuku
With minimal seasonal shifts, Wailuku experiences a constant climate year-round. Average daytime temperatures reach a very warm 30°C (86°F) in August. In February, the coolest month of the year, temperatures drop to a comfortable 26°C (79°F).
At night, temperatures range from around 24°C (75°F) in August to 20°C (68°F) in February.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Wailuku
Wailuku has a relatively dry climate with low precipitation, averaging 386 mm (15 in) of rainfall annually. Wailuku can be quite wet during March, receiving approximately 55 mm (2.2 in) of precipitation over 13 rainy days.
In contrast, during the driest month (June), you will experience much drier conditions, with 15 mm (0.6 in) of precipitation spread across 8 rainy days. For more details, please visit our Wailuku Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Sunshine Hours in Wailuku
Wailuku experiences moderate variation in sunshine hours across the seasons. With 9.8 hours daily sunshine in July, it dips to 7.0 hours in February, offering a balanced mix of sunny and overcast days.
Visit our detailed sunshine hours page for more information.
Monthly hours of sunshine
Daily hours of sunshine
Daily percentage of sunshine
Water Temperature in Wailuku
The mean water temperature over the year ranges from 24°C (75°F) in January to 27°C (81°F) in September.
Water temperature over the year
Humidity in Wailuku by Month
The relative humidity is high throughout the year in Wailuku.
The city experiences its highest humidity in January, reaching 78%. In August, the humidity drops to its lowest level at 69%. What does this mean? Read our detailed page on humidity levels for further details.
Relative humidity over the year
Wind Speed in Wailuku
The mean wind speed over the year ranges from 4 m/s (8 knots) in January, February, October, November and December to 6 m/s (12 knots) in June, July and August. What does this mean?
The mean monthly wind speed over the year (meters per second)
Best Time to Visit Wailuku
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
- Best overall: January, February, March, April, May, June, November and December
- Warmest weather: June, July, August, September and October
- Most sunshine: June, July and August
- Fewer rainy days: May, June, July, August and September
- Best for swimming: Any time of year. The sea stays pleasantly warm year-round.
- Seasonal pattern: A distinct dry season from April to November
Frequently asked questions about the climate in Wailuku
What is the best time to visit Wailuku?
January, February, March, April, May, June, November and December typically offer the most optimal weather in Wailuku. In contrast, July, August, September and October tend to have less optimal conditions. Wailuku has a distinct dry season from April to November.
What temperatures can I expect in Wailuku?
Daytime highs range from 26°C (79°F) in February to 30°C (86°F) in August. Nighttime lows range from 20°C (68°F) to 24°C (75°F). Temperatures stay relatively stable year-round.
How much rain does Wailuku get?
Annual rainfall is around 386 mm (15 in). March is the wettest month with 55 mm (2.2 in), while June is the driest with 15 mm (0.6 in).
How sunny is Wailuku?
Wailuku receives around 2,989 hours of sunshine per year. July is the sunniest month with 294 hours, while February is the cloudiest with just 210 hours. Overall, Wailuku enjoys abundant sunshine.
Wailuku 3-Day Forecast
Wailuku (HI) 3-Day Forecast
Wailuku on the map
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