Koolau Forest Reserve Weather Forecast
- 58
- 71
Rain Showers
- 59
- 70
Mostly Cloudy
- 59
- 70
Rain Showers
- 59
- 70
Rain Showers
- 57
- 68
Rain Showers
- 57
- 67
Rain Showers
Today 18 Dec Windward Haleakala
Mostly sunny with isolated Showers. Highs around 82 near the shore to around 66 near 5000 feet. Light Winds becoming northwest up to 10 Mph in the afternoon. Chance of rain 20 percent.
Tonight 18 Dec Windward Haleakala
Partly cloudy. Isolated Showers in the evening. Lows around 70 near the shore to around 51 near 5000 feet. Light Winds. Chance of rain 20 percent.
Koolau Forest Reserve Temperature Statistics
December Temperature
Kahului, Kahului Airport (17.4 miles)
Lowest 2 December, 2025
61 °FAverage December
74.9 °FHighest 4 December, 2025
87.1 °F
Climate (2020–Present)
Kahului, Kahului Airport (17.4 miles)
Average Low 2020–2025
68.8 °FAverage 2020–2025
76.7 °FAverage High 2020–2025
85.5 °F