The weather forecast for various regions of the Big Island indicates a mix of conditions over the next few days.
In Hilo, tonight will be partly cloudy with scattered showers and temperatures dipping between 62 to 69 degrees near the shore and 49 to 56 degrees at 4000 feet.
Northeast winds up to 10 mph are expected to shift to the northwest around midnight.
A 50 percent chance of rain underscores the possibility of continued precipitation into the night.
On Friday, Hilo is predicted to have mostly sunny skies with isolated showers in the morning, transitioning to scattered showers in the afternoon.
High temperatures are forecasted to range from 79 to 84 degrees near the shore and 65 to 70 degrees at 4000 feet.
Northeast winds will persist, maintaining a 50 percent chance of rain.
As night falls in Hilo, the skies will become mostly cloudy again, with scattered showers.
Temperatures will mirror tonight’s lows, staying between 62 to 69 degrees near the shore and 50 to 57 degrees at 4000 feet, with a continued chance of rain.
In contrast, Kona’s weather tonight is characterized by mostly cloudy skies and scattered showers, coupled with haze.
Temperatures are expected to range from around 72 degrees near the shore to 46 to 52 degrees near 5000 feet.
Light winds will contribute to a 50 percent chance of rain throughout the night.
The forecast for Friday suggests a mostly sunny morning evolving into partly sunny conditions later in the day, accompanied by scattered showers and continued haze.
Daytime highs will reach around 85 degrees near the shore and around 67 degrees near 5000 feet, with west winds up to 10 mph.
Friday night, Kona will see mostly cloudy skies with evening scattered showers, then becoming partly cloudy with isolated showers thereafter.
Haze and temperatures mirroring tonight’s lows will persist, with lows remaining around 72 degrees near the shore to 46 to 52 degrees near 5000 feet.
As for Waimea, tonight offers a mild climate with partly cloudy skies and isolated showers.
Lows will vary from 61 to 70 degrees near the shore and 52 to 60 degrees near 3000 feet, sustained by east winds blowing at 10 to 15 mph.
A lower rain chance of 20 percent is forecasted tonight.
On Friday, the conditions will turn breezy, featuring mostly sunny skies and isolated showers.
Highs are predicted to peak between 62 and 84 degrees, with sustained east winds at 10 to 20 mph.
Friday night will maintain breezy conditions, transitioning to partly cloudy skies with isolated showers.
Temperatures will continue to hover between 62 to 71 degrees near the shore and 53 to 61 degrees near 3000 feet.
Kohala’s forecast echoes Waimea’s, with partly cloudy conditions and isolated showers tonight.
Temperatures will also range from 61 to 70 degrees near the shore to 52 to 60 degrees near 3000 feet, similar wind speeds expected at 10 to 15 mph, and a 20 percent chance of rain.
Friday will be breezy again, offering mostly sunny weather with isolated showers, high temperatures from 62 to 84 degrees, and east winds at 10 to 20 mph.
The breezy conditions will carry into Friday night as well, with lows remaining consistent with earlier predictions.
South Big Island weather tonight will predominantly be cloudy with scattered evening showers, transitioning to partly cloudy with isolated showers later.
Haze will linger, with temperatures around 72 degrees near the shore and around 50 degrees near 5000 feet, accompanied by east winds of 10 to 15 mph and a 50 percent chance of rain.
Friday promises mostly sunny skies, a breezy atmosphere, with isolated showers in the morning and scattered showers by afternoon.
Highs near the shore are expected to be around 87 degrees, tapering off to around 65 degrees near 5000 feet, under east winds of 10 to 20 mph and a rain chance of 40 percent.
As night takes over, skies will shift from mostly cloudy to partly cloudy, remaining breezy with haze.
Puna’s tonight forecast is similar to Hilo’s, with partly cloudy skies and scattered showers, temperatures from 62 to 69 degrees near the shore and 49 to 56 degrees at 4000 feet.
Northeast winds up to 10 mph shifting to the northwest after midnight will echo the 50 percent chance of rain.
On Friday, expect mostly sunny conditions, switching to isolated showers in the morning and scattered showers in the afternoon.
Temperatures are projected to be between 79 to 84 degrees near the shore and 65 to 70 degrees at 4000 feet, once again with a 50 percent chance of rain.
Friday night casts a repeating scenario in Puna, with mostly cloudy conditions and scattered showers expected, temperatures the same as before.
Finally, in Waikoloa, the forecast tonight calls for partly cloudy skies with isolated evening showers and haze throughout the night.
Lows could range from 69 to 75 degrees near the shore, and 49 to 54 degrees above 4000 feet, with east winds blowing at 10 to 15 mph.
Friday will offer mostly sunny conditions with background haze and isolated afternoon showers, highs from 83 to 90 degrees near the shore to 64 to 73 degrees above 4000 feet.
Friday evening will maintain partly cloudy skies and haze, with lows remaining consistent with the earlier forecast.
Looking ahead, the forecast calls for strengthening trade winds on Friday, expected to veer to east-southeasterly for the weekend.
Stable atmospheric conditions will mean that windward and mauka showers will be more isolated and brief.
This pattern is anticipated to persist into next week, featuring breezy trade winds with occasional passing showers concentrated on windward and mauka slopes.
An upper-level low near the islands is expected to drift northeast but will influence weather patterns while a second low forms to the west.
A trough in the low to mid levels alongside a strengthening surface high will increase trade winds on Friday for the region.
As this trough shifts further south into the weekend, conditions will border hazier, due to possible VOG or volcanic smog, particularly affecting the eastern side of the state.
In aviation, an AIRMET SIERRA has been issued for SW Big Island, warning of mountain obscuration due to clouds and showers as onshore seabreezes develop.
This phenomenon is anticipated to subside shortly after sunset as land breezes take over.
Overall, visual flight rules (VFR) are expected to dominate the weather pattern, albeit with some clouds and showers presenting lower visibility in certain areas, mostly near Kauai and Oahu.
Marine forecasts predict that high-pressure building north of the islands will strengthen trade wind flow and lead to fresh to strong trade winds by Friday.
By Friday afternoon, wind conditions may reach Small Craft Advisory levels in the typical windier waters near Maui County and the Big Island.
As the high pressure shifts northeast over the weekend, winds may adjust slightly to a southeasterly direction, but Small Craft Advisory levels are expected to persist in wind-prone areas.
A forthcoming front passing to the north of the islands will potentially bring another uptick in winds come early next week.
This scenario could prompt an expansion of advisory areas due to heightened winds across coastal waters.
Surf conditions are predicted to maintain average levels from long-period south-southwest swells through Friday before gradually declining in the weekend.
Meanwhile, overlapping north-northwest swells will sustain surf levels along north and west-facing shores into Friday, though a second swell is set to boost heights above average on Saturday.
Surf levels are expected to drop to seasonal averages by Sunday into early next week.
Finally, east-facing shores should see gradually increasing surf over the weekend extending into early next week due to returning trade winds.
image source from：https://bigislandnow.com/2025/05/29/hawaii-county-weather-forecast-for-may-30-2025/
