Climate and monthly weather forecast
Halawa, HI


The climate of Halawa

Belonging to the As climate group as per the Köppen climate classification, Halawa, Hawaii, experiences a tropical wet and dry landscape or savanna, with the dry season occurring in the 'summer'. Its geographical position plays a significant role in shaping the local weather, which varies across the year offering distinct weather conditions during different months.

The monthly average temperature high maintains a range from 77°F (25°C) to a peak of 82°F (27.8°C), witnessed from March to October. The lowest temperature averages hover between 61°F (16.1°C) in the earliest months of the year, reaching 68°F (20°C) around August. Rainfall totals fluctuate, peaking at 7.4" (188mm) in January, to as low as 1.9" (48mm) in the month of June. Consequently, the number of rainfall days also vary, maxing out at 12 or hitting lows of 7.

Sea temperatures reveal a similar pattern, travelling from 75°F (23.9°C) early in the year, to a comfortable 81°F (27.2°C) by September. Daylight hours show a recurrent annual trend, climbing from 11 hours in January to peak at 13.4 hours in June, before descending through the year's end. Sunshine enjoys similar patterns, whereas the UV index maintains high levels during the summer months, hitting lows as the season turns towards winter.

The best time to visit Halawa

The best time to visit Halawa, considering overall climatic conditions, lies from April to September. These months offer ample daylight hours ranging from 12.7 to 13.4 hours per day, accompanied by high sunshine hours reaching a peak of 9 hours per day. Sea temperatures during this period vary from 75°F (23.9°C) to 81°F (27.2°C), ideal for maritime activities. Rainfall is quite scarce during these months, averaging between 1.9" (48mm) to 3.3" (84mm), making them the driest months of the year.

The worst time to visit Halawa

The time period from October to March might not be the most favourable time for a visit due to high rainfall. The average rainfall ranges from 5.5" (140mm) to 7.4" (188mm) with nearly 12 days of precipitation on a monthly average. The UV index also drops considerably during these months, hitting a low of 6 in December.

Spring weather in Halawa

Spring weather in Halawa, from March to May, presents a mix of gradually warming temperatures and diminishing rainfall. Average high temperatures increase from an already pleasant 77°F (25°C) to 81°F (27.2°C), while the minimum temperature increases from 61°F (16.1°C) to 64°F (17.8°C). Rainfall sees a sizeable decrease, going down from 7" (178mm) to 3.3" (84mm). At the same time, daylight increases considerably from 12 to 13.2 hours.

Summer weather in Halawa

Summer, which spans from June to August, sees peak temperatures, with daily highs from 81°F (27.2°C) to 82°F (27.8°C). The average low temperature ranges from 66°F (18.9°C) to 68°F (20°C). These months witness the least amount of rainfall in the year, averaging from 1.9" (48mm) to 3" (76mm) with approximately 7-8 rainfall days each month. The UV index touches its apex during summer, with a maximum of 12.

Autumn weather in Halawa

During the Autumn season (September to November), temperatures begin a gradual decline, with the average high temperatures falling from 82°F (27.8°C) to 81°F (27.2°C) and low temperatures from 66°F (18.9°C) to 64°F (17.8°C). Rainfall sees an uptick during these months, going from 2" (51mm) to 6.4" (163mm).

Winter weather in Halawa

The winter season (December to February) in Halawa is marked by a further decrease in temperature, with the average high going from 79°F (26.1°C) to 77°F (25°C) and the average low from 63°F (17.2°C) to 61°F (16.1°C). Rainfall also sees the highest processing of the year, with 6.5" (165mm) to 7.4" (188mm), and the number of rainy days going up to 12. Daylight hours see a decrease, dropping from 11.1 to 10.9 hours. Sunshine hours and the UV index also follow a similar trend, with average sunshine hours decreasing from 7 to 6, and the UV index dropping to 6.

Weather in January

The initiation of the year in Halawa, Hawaii introduces a convenient temperature spectrum. The mercury varies from 61°F (16.1°C) at its lowest to a comfortable high of 77°F (25°C). However, rainfall becomes particularly pronounced, with January recording 7.4" (188mm) over 12 days. Weather in January »

Weather in February

The atmospheric condition in February experiences minimal temperature changes, sustaining the comfort of the previous month. However, a notable downturn occurs in the rainfall category, with precipitation volumes dropping to 5.8" (147mm). Weather in February »

Weather in March

The transition from February to March signifies an ascent in temperature ranges, however, this remains relatively indiscernible. Halawa's weather conditions record a rise in rainfall, 7" (178mm) overall, marking it as one from the wetter months of the year. Weather in March »

Weather in April

April witnesses a step up in the thermal scale of Halawa, nudging the lower limit to 63°F (17.2°C), and the upper limit to 79°F (26.1°C). In terms of precipitation, April brings relief as rainfall dwindles to 5.5" (140mm). The daylight duration witnesses a substantial increase this month, and the sunshine indexes rise in tandem. Weather in April »

Weather in May

In May, the tropical landscape of Halawa steps closer to summer heats, bringing along a gentle rise in temperature. A more significant weather shift becomes apparent with a drop in rainfall to 3.3" (84mm), suggesting a transition into drier months. Weather in May »

Weather in June

As the middle of the year approaches, June brings further escalation of temperatures in Halawa, Hawaii. Drier conditions become more evident with the lowest rainfall of the year, at just 1.9" (48mm). The daylight duration peaks, complemented by an equal hike in sunshine hours. Weather in June »

Weather in July

The month of July in Halawa is marked by subtle yet steady temperature increments. Rainfall begins its uphill climb from the lows of June, standing at 3" (76mm) in July. Emphasizing sun protection becomes vital as the UV index peaks. Weather in July »

Weather in August

August continues with the warm trend in Halawa, matching the temperature high of July. Despite this, it brings an additional increase in the lower temperature, peaking at 68°F (20°C). Rainfall registers a slight drop, marking 2.5" (64mm) throughout the month. Weather in August »

Weather in September

As summer fades in September, Halawa's weather patterns begin to alter. The temperature, though persisting in its highs, notices a small dip at the lower end. A moderate increase in rainfall to 2" (51mm) signifies the onset of a moistening climate. Weather in September »

Weather in October

In October, a downward shift in the upper limit of temperature signals a cooling trend in Halawa. A significant rise in rainfall to 3.7" (94mm) denotes preparations for the wetter months ahead. The UV index and daylight duration continue on their receding trajectory. Weather in October »

Weather in November

November sees a perceptible reduction in the city's temperature range. Rainfall continues to ascend, bringing 6.4" (163mm) throughout the month. Diminishing daylight hours, a drop in the UV index, and decreasing sunshine hours begin to pronounce the end of the year weather in Halawa. Weather in November »

Weather in December

December, the final month of the year, solidifies the cooling trend in Halawa, lowering the temperature range to between 63°F (17.2°C) and 79°F (26.1°C). The precipitation hits an annual high, recording 6.5" (165mm) over 12 rainy days. Weather in December »

Frequently asked questions

What time of the year is the coldest in Halawa?

Halawa's average lowest temperatures are recorded in January through March, reaching a high of 77°F (25°C).

What is the rainiest month in Halawa?

January is the month with the most rainfall in Halawa. Rain falls for 12 days and accumulates 7.36" (187mm) of precipitation.

How many days does it rain in Halawa?

In Halawa, Hawaii, during the entire year, the rain falls for 116 days and collects up to 54.96" (1396mm) of precipitation.

What are the months with the coldest ocean in Halawa?

The months with the coldest seawater are January through April, with an average ocean temperature of 75.2°F (24°C).

What are the months with the least sunshine in Halawa?

The months with the least sunshine in Halawa, Hawaii, are January, February, November and December, with an average of 7h of sunshine.

What is the month with the most sunshine in Halawa?

The months with the most sunshine in Halawa, Hawaii, are May through September, with an average of 9h of sunshine.

What is the driest month in Halawa?

June is the month with the least rainfall in Halawa, Hawaii. Rain falls for 7 days and accumulates 1.85" (47mm) of precipitation.

When are the longest days in Halawa?

With an average of 13h and 24min of daylight, June has the longest days of the year.

What are the months with the highest UV index in Halawa?

June through August, with an average maximum UV index of 12, are months with the highest UV index.

What is the hottest time of year in Halawa?

In Halawa, Hawaii, the months of July through October are known for the peak temperatures, reaching an average high of 82.4°F (28°C).

What month is the ocean warmest in Halawa?

September is the month with the warmest seawater in Halawa, with an average ocean temperature of 80.6°F (27°C).

What is the month with the shortest days in Halawa?

The month with the shortest days in Halawa is December, with an average of 10h and 54min of daylight.

Is there Daylight Saving Time (DST) in Halawa?

Halawa, Hawaii, does not observe Daylight Saving Time (DST). HST timezone is used over the entire year.

When is the lowest UV index in Halawa?

The month with the lowest UV index in Halawa, Hawaii, is December, with an average maximum UV index of 6.

Average temperature
Halawa, HI

Average temperature - Halawa, HI

The warmest months (with the highest average high temperature) are July, August, September and October (82°F).
The months with the lowest average high temperature are January, February and March (77°F).

The month with the highest average low temperature is August (68°F).
The coldest months (with the lowest average low temperature) are January, February and March (61°F).


Average rainfall
Halawa, HI

Average rainfall - Halawa, HI

The wettest month (with the highest rainfall) is January (7.4").
The driest month (with the least rainfall) is June (1.9").


Average rainfall days
Halawa, HI

Average rainfall days - Halawa, HI

The months with the highest number of rainy days are January, March, April and December (12 days).
The months with the least rainy days are June and September (7 days).


Average sea temperature
Halawa, HI

Average sea temperature - Halawa, HI

The best month for swimming (with the highest average sea temperature) is September (81°F).
The coldest months (with the lowest average sea temperature) are January, February, March and April (75°F).


Average daylight / Average sunshine
Halawa, HI

Average daylight / Average sunshine - Halawa, HI

The month with the longest days is June (Average daylight: 13h and 24min).
The month with the shortest days is December (Average daylight: 10h and 54min).

The months with the most sunshine are May, June, July, August and September (Average sunshine: 9h).
The months with the least sunshine are January, February, November and December (Average sunshine: 7h).


Halawa, Hawaii, USA

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