Kumimi Beach (20 Mile Beach)
Hawaii · United States
Rating right now
Kumimi Beach (20 Mile Beach) is a SE-facing sand beach on the Coastal Waters coastline near Hawaii — it picks up E–SW swell and turns cleanest in a NW–N wind, with the most consistent surf through year-round.
10-day forecast
Local time · updates hourly
Wave height & period
Wind
| Time | Rating | Waves | Swell | Wind | Air |
|---|---|---|---|---|---|
Water temperature by month
This month: ~26.7°C (80.1°F) on average
Jan
24.5°C
76.1°F · 23.1–25.5°C
Feb
24°C
75.2°F · 22.3–25°C
Mar
24°C
75.2°F · 23–25°C
Apr
24.4°C
75.9°F · 23.2–25.3°C
May
25°C
77°F · 24.1–26.4°C
Jun
25.4°C
77.7°F · 24.3–26.6°C
Jul
25.9°C
78.6°F · 24.9–27°C
Aug
26.2°C
79.2°F · 25.3–27.7°C
Sep
26.7°C
80.1°F · 25–28.7°C
Oct
26.5°C
79.7°F · 24.9–27.7°C
Nov
26°C
78.8°F · 24.5–27.6°C
Dec
25.1°C
77.2°F · 23.8–26.2°C
25-year monthly averages from the NOAA OISST satellite record — typical range min–max, not a live reading.
Know before you go
Best swell
E–SW
Best wind
NW–N
Break type
Beach break
Best season
Year-round
Safety: Friendly by surf standards, but rip currents and drop-in etiquette still apply. Shifting sandbars create moving rip currents — learn to spot them and use them to get out back. Sharks are part of the ecosystem here — avoid dawn, dusk and murky rivermouth water.
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