Hot in May
31°C average high
avg high · 16° at night
25°C+ on 9 in 10 days · often 35°C+
Hawaii, USA
Honolulu (Waikiki) weather in May
Is it warm? Yes. May in Honolulu (Waikiki) is hot: afternoons average 30°C and nights 22°C. Most days (80%) peak between 29°C and 31°C.
Hot · average high
30°C
25°C or more on almost every day.
- Average low22°overnight
- Sea25°average, 2022–2025
- Rainy days436 mm in the month
- SkySome cloud36% cloud · 57% clear days
How warm it really gets
Every May afternoon from 2011–2025: 465 days. Most (80%) peaked between 29° and 31°.
May, year by year
The average May high in each year. The warmest, 2019, averaged 30°C; the coolest, 2012, 29°C.
Compared with home
Average May highs. Expect rain on about 4 days (36 mm in a typical month).
- Honolulu (Waikiki)30°
- London19°
- Glasgow17°
- Manchester16°
- Cork16°
- Belfast16°
- Dublin16°
Warmer in May, not much further
Flying times are estimates from Dublin; Honolulu (Waikiki) is about 14h 15m.
Very hot in May
36°C average high
avg high · 23° at night
25°C+ on almost every day · often 35°C+
Very hot in May
35°C average high
avg high · 25° at night
25°C+ on almost every day · often 35°C+
Air: Copernicus ERA5-Land, 2011–2025, matched to the official averages for Honolulu airport. Sea: Copernicus ERA5, 2022–2025. Rainy days = days with 1 mm of rain or more, as weather stations count them. Clear day = average cloud cover of 30% or less. These are averages of past weather, not a forecast. Methodology