Honolulu boasts a hot semi-arid climate (BSh), characterized by warm temperatures, limited rainfall, and abundant sunshine. Due to a rain shadow effect, the city receives less precipitation than a tropical climate despite meeting the temperature threshold for tropical classification.

Year-Round Warmth with Minimal Temperature Variation

Honolulu’s temperatures remain consistent throughout the year, with highs ranging from 80–90°F (27–32°C) and lows between 65–75°F (18–24°C).

• Winter (December–March): Occasional dips below 64°F (18°C) but still mild.
• Summer (June–September): A few days reach 90°F (32°C) or higher, averaging about 32 hot days per year.
• Historical Records:
  • Hottest Day: 95°F (35°C) on September 19, 1994, and August 31, 2019.
  • Coldest Day: 52°F (11°C) on February 16, 1902, and January 20, 1969.

Rainfall and Sunshine: A Balanced Mix

Honolulu receives an annual average of 16.41 inches (417 mm) of rainfall, mostly between October and early April. However, the number of rainy days remains consistent year-round, with light showers in summer and heavier rainfall in winter.

• Average Sunny Days Per Year: 278 days
• Average Rainy Days Per Year: 89.2 days

Extreme Weather and Ocean Temperatures

While Honolulu is in the tropics, hurricanes and tornadoes are rare:

• The last major hurricane near Honolulu was Category 4 Hurricane Iniki in 1992.
• Tornadoes occur roughly once every 15 years.
• Waterspouts appear offshore about once every five years.

The Pacific Ocean surrounding Honolulu maintains comfortable temperatures year-round, ranging from 75.7°F (24.3°C) in March to 80.4°F (26.9°C) in September, making swimming and water activities enjoyable in any season.

With its pleasant climate, abundant sunshine, and mild winters, Honolulu remains a top destination for visitors looking to experience paradise all year long.