Hawaii (Big Island) Weather Forecast
Hawaii (Big Island) weather: 57°F, thunderstorm. Hourly forecast, 14-day outlook, UV, air quality and the best time to visit.
Risk assessment for Hawaii (Big Island)
Derived from the current forecast window - not an official warning.
Peak gusts of 23 mph and 2 thunderstorm days in the next 16 days.
Wettest single day forecast at 1,8 in, 4,7 in across the window. Flash flooding risk rises sharply above 50 mm in a day.
Active alerts for Hawaii (Big Island)
Flood Watch issued September 17 at 5:40PM HST until September 18 at 6:00AM HST by NWS Honolulu HI
Issued by NWS Honolulu HI
16-day forecast for Hawaii (Big Island)
Daily highs and lows, precipitation and UV.
| Day | Conditions | High / Low | Precip | Wind | UV |
|---|---|---|---|---|---|
| Thu, Sep 17 | ⛈️ Thunderstorm | 61° / 54° | 100% · 1,8 in | 13 mph | 8 |
| Fri, Sep 18 | ⛈️ Thunderstorm | 61° / 52° | 100% · 0,9 in | 9 mph | 10 |
| Sat, Sep 19 | 🌦️ Light drizzle | 63° / 53° | 92% · 0,0 in | 10 mph | 9 |
| Sun, Sep 20 | 🌦️ Light drizzle | 62° / 52° | 100% · 0,0 in | 10 mph | 10 |
| Mon, Sep 21 | ☁️ Overcast | 63° / 53° | 100% | 10 mph | 9 |
| Tue, Sep 22 | 🌦️ Light drizzle | 64° / 54° | 100% · 0,1 in | 10 mph | 8 |
| Wed, Sep 23 | 🌦️ Light showers | 58° / 55° | 96% · 0,5 in | 5 mph | 5 |
| Thu, Sep 24 | 🌦️ Light showers | 60° / 56° | 97% · 0,8 in | 7 mph | 7 |
| Fri, Sep 25 | 🌦️ Light showers | 59° / 54° | 90% · 0,5 in | 8 mph | 8 |
| Sat, Sep 26 | ⛅ Partly cloudy | 59° / 52° | 88% | 11 mph | 9 |
| Sun, Sep 27 | ☁️ Overcast | 58° / 51° | 80% | 11 mph | 9 |
| Mon, Sep 28 | 🌦️ Light drizzle | 57° / 51° | 82% · 0,0 in | 10 mph | 7 |
| Tue, Sep 29 | ☁️ Overcast | 57° / 53° | 77% | 11 mph | 9 |
| Wed, Sep 30 | 🌦️ Light drizzle | 59° / 53° | 65% · 0,0 in | 8 mph | 8 |
| Thu, Oct 1 | ☁️ Overcast | 58° / 52° | 72% | 6 mph | 9 |
| Fri, Oct 2 | ☁️ Overcast | 60° / 51° | 71% | 12 mph | 9 |
What this means for Hawaii (Big Island)
Today is about average for September. The forecast high of 61°F is in line with the 61°F typical for this month.
A 100% chance means rain is expected over most of the area. Plan indoor alternatives. Around 1,8 in is forecast, which is enough to soak trails and slow traffic.
Wet roads are likely; braking distances roughly double in heavy rain.
Northern Hemisphere, so peak summer falls in June to August.
The gap between the warmest and coldest month averages 39°F - an unusually even climate through the year.
See the Hawaii (Big Island) forecast by time range
Hawaii (Big Island) weather - more answers
Explore Hawaii (Big Island)
Every topic we hold for this place, and the same topic for the places around it.
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Frequently asked questions
Where is Hawaii (Big Island)?
Hawaii (Big Island) is an island in Hawaii. Its coordinates are 19.5429, -155.6659. It lies in North America.
What is the weather like in Hawaii (Big Island) right now?
It is currently 57°F (14°C) with thunderstorm. Humidity is 85% and wind is 5 mph.
When is the best time to visit Hawaii (Big Island)?
June, July, September, October and December offer the most comfortable conditions in Hawaii (Big Island), which has a temperate climate. March, April and August are usually the hardest months for outdoor plans.
What time zone is Hawaii (Big Island) in?
Hawaii (Big Island) observes Pacific/Honolulu (UTC-10:00). The local time is 4:01 AM.
What is the nearest airport to Hawaii (Big Island)?
The closest airports are Daniel K. Inouye International Airport (HNL), 191 mi away.
What are the top things to do in Hawaii (Big Island)?
Popular options include Hawaii Volcanoes National Park, Road to Hana, Haleakala National Park, Maui, Waikiki Beach and Pearl Harbor National Memorial.
Related articles
Data sources and methodology
| Place data | USPOTUS Atlas dataset (islands) - coordinates, hierarchy and facts. |
|---|---|
| Forecast and observations | Open-Meteo (ECMWF and national models). |
| Air quality and pollen | Copernicus CAMS via Open-Meteo. US AQI scale. |
| Climate averages | ERA5 reanalysis via the Open-Meteo archive, aggregated over 3 years. |
| Official alerts | US National Weather Service. |
| Method | Scores, comparisons and advice on this page are computed from the inputs above. Distances are straight-line. Nothing is estimated where data is missing - the block is simply not shown. |
Last updated September 18, 2026 at 4:01 AM local time. Live blocks refresh every 15 minutes; climate averages monthly.
