Hilo, Big Island weather in August 2025

Q: How hot is it in Hilo, Big Island in August?

Daytime temperatures usually reach 24°C in Hilo, Big Island in August, falling to 16°C at night.

Q: How sunny is it in Hilo, Big Island in August?

There are normally 5 hours of bright sunshine each day in Hilo, Big Island in August - that's 42% of daylight hours.

Q: How warm is the sea around Hilo, Big Island in August?

The average sea temperature around Hilo, Big Island in August is 26°C.

Q: Does it rain in Hilo, Big Island in August?

There are usually 15 days with some rain in Hilo, Big Island in August and the average monthly rainfall is 250mm.

Q: What is the chance of a cyclone in Hilo, Big Island in August?

On average less than 1 day in August in Hilo, Big Island is likely to be affected by the passage of one or more tropical storms.

Expect 75°F daytime maximum temperatures in the shade with on average 5 hours of sunshine per day in Hilo, Big Island in August. Check more long-term weather averages for Hilo, Big Island in August before you book your next holiday to Hawaii in 2025/2026.

75
75°F max day temperature
5
5 hours of sunshine per day
15
15 days with some rainfall
61
61°F min night temperature
13
13 hours of daylight per day
M
Moderate heat & humidity
9.8
9.8 inches of monthly rainfall
11
11+ (Extreme) UV index
79
79°F sea temperature

More about Hilo, Big Island

Hilo, Big Island by month

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Recommended for Hawaii

Auto Europe: Cheap car hire deals worldwide

Sale

Compare car hire prices to find lowest rate
Free cancellation up to 48 hours before pick up
Book car hire for over 20,000 destinations worldwide

Go to Auto Europe deal >>

View all Auto Europe offers

The August weather guide for Hawaii (Hilo, Big Island) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

Metric (°C) | Imperial (°F)

More about the USA

How hot is it in Hilo, Big Island in August?

Daytime temperatures usually reach 75°F in Hilo, Big Island in August, falling to 61°F at night.

How sunny is it in Hilo, Big Island in August?

There are normally 5 hours of bright sunshine each day in Hilo, Big Island in August - that's 42% of daylight hours.

How warm is the sea around Hilo, Big Island in August?

The average sea temperature around Hilo, Big Island in August is 79°F.

Does it rain in Hilo, Big Island in August?

There are usually 15 days with some rain in Hilo, Big Island in August and the average monthly rainfall is 9.8 inches.

What is the chance of a hurricane in Hilo, Big Island in August?

On average less than 1 day in August in Hilo, Big Island is likely to be affected by the passage of one or more tropical storms.

Hilo, Big Island August sunrise & sunset times

Browse the sunrise and sunset times for Hilo, Big Island in August 2025. Select a month to view Hilo, Big Island sunrise and sunset times for the next 12 months.

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Date	Sunrise times	Sunset times
Friday, 1st August 2025	05:56	18:57
Saturday, 16th August 2025	06:01	18:48
Sunday, 31st August 2025	06:05	18:36

Be inspired

Get your weekly fix of holiday inspiration from some of the world's best travel writers plus save on your next trip with the latest exclusive offers

We promise not to share your details

Popular travel offers

Hawaii - quick facts
Flight time^✝	18 hours
Time difference	UK -10 hours
Language(s)	English
Currency	US Dollar
Electricity	A + B plug (120V)
Driving side	Right
Visa^✝	Yes
Why visit?	Beaches Nature Nightlife
Tourist info	Hawaii Tourism Authority