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Contents
- The climate of Hilo
- The best time to visit Hilo
- The worst time to visit Hilo
- Spring weather in Hilo
- Summer weather in Hilo
- Autumn weather in Hilo
- Winter weather in Hilo
- Weather in January
- Weather in February
- Weather in March
- Weather in April
- Weather in May
- Weather in June
- Weather in July
- Weather in August
- Weather in September
- Weather in October
- Weather in November
- Weather in December
- Frequently asked questions
- Average temperature
- Average pressure
- Average wind speed
- Average humidity
- Average rainfall
- Average rainfall days
- Average sea temperature
- Average daylight
- Average sunshine
- Average sunshine days
- Average UV index
- Average cloud cover
- Average visibility
The climate of Hilo
Stationed on the Big Island in Hawaii, Hilo finds itself in the Cfb zone under the Köppen climate classification, indicating a Marine west coast climate with warm summers. Over the year, this pleasant coastal city experiences mild to moderate temperature variations and substantial rainfall amounts.
Evaluating the collected data, the climate remains stable and consistent, with minimal extremes concerning temperature and rainfall. On average, the monthly high temperatures straddle around 74.7°F (23.7°C), rarely plunging below 69.6°F (20.9°C) or soaring above 75.4°F (24.1°C). The low temperatures, on the other hand, keep within 64°F (17.8°C) and 70°F (21.1°C).
When considering rainfall, Hilo is a rain-drenched city with an annual average of over 27" (686mm). Rainfall ranges narrowly between 1.1" (28mm) and 3.78" (96mm) each month. The city is blessed with abundant cloud cover, keeping the direct sunlight in check. Notably, March receives the most rain with 3.15" (80mm), while May reports the least rainfall of 1.1" (28mm).
Evaluating the collected data, the climate remains stable and consistent, with minimal extremes concerning temperature and rainfall. On average, the monthly high temperatures straddle around 74.7°F (23.7°C), rarely plunging below 69.6°F (20.9°C) or soaring above 75.4°F (24.1°C). The low temperatures, on the other hand, keep within 64°F (17.8°C) and 70°F (21.1°C).
When considering rainfall, Hilo is a rain-drenched city with an annual average of over 27" (686mm). Rainfall ranges narrowly between 1.1" (28mm) and 3.78" (96mm) each month. The city is blessed with abundant cloud cover, keeping the direct sunlight in check. Notably, March receives the most rain with 3.15" (80mm), while May reports the least rainfall of 1.1" (28mm).
The best time to visit Hilo
For tourists seeking the prime travel window, the period between April and June would be the ideal choice for Hilo. In these months, there's a relative decrease in rainfall, with figures dwindling around 1.38" (35mm) in May. The average high temperatures hover favorable in the range of 70.9°F (21.6°C) to 73.6°F (23.1°C), while lows remain comfortable between 64.9°F (18.3°C) and 66.9°F (19.4°C) . With extended daylight hours of up to 13.1 hours and maximum sunshine of 10.6 hours in May, ample opportunities open up for outdoor exploration.
The worst time to visit Hilo
A less favored time to visit Hilo would be the early months of the year, specifically February. Higher rainfall of 3.78" (96mm), combined with the lowest daylight hours (11.5 hours) and the least amount of sunshine (8.3 hours), can somewhat limit outdoor adventures. The high and low average temperatures during this time are 70.2°F (21.2°C) and 64.2°F (17.9°C), respectively, which may feel a bit chilly for some.
Spring weather in Hilo
Hilo's spring season, from March to May, brings about a welcome change. Temperatures sit comfortably between 69.6°F (20.9°C) and 73.6°F (23.1°C) for highs and 64°F (17.8°C) to 66.9°F (19.4°C) for lows. While March sees the peak of rainfall with 3.15" (80mm), it gradually tapers to the lowest of 1.1" (28mm) by May. A steady increase in daylight hours from 12.1 to 13.1 hours and a significant bump in sunshine duration from 7.5 hours to 10.6 hours brightens up the city.
Summer weather in Hilo
Summer in Hilo, extending from June to August, is synonymous with warmth and sunshine. The city experiences the year's peak temperatures, with highs nestling from 73.6°F (23.1°C) to 75.4°F (24.1°C) and lows from 66.9°F (19.4°C) to 68.9°F (20.5°C). Rainfall contracts to an average of between 1.1" (28mm) and 2.52" (64mm), while daylight hours peak at 13.3 hours in June. This full bloom of sunshine extending to 10.9 hours in June lightens up the cityscape, offering extended outdoor activities.
Autumn weather in Hilo
The transition to autumn from September to November presents a slight cooling in Hilo. High temperatures drop slightly from 75.2°F (24°C) to 72.9°F (22.7°C), and the lows taper between 70°F (21.1°C) and 68°F (20°C). Despite a mild increase in rainfall, stretching from 1.81" (46mm) to 2.36" (60mm), the daylight hours remain generous ranging from 12.2 to 11.2 hours.
Winter weather in Hilo
Winter months in Hilo, from December to February, experience a slightly cooler but comfortable climate. With the high temperatures descending moderately from 71.6°F (22°C) to 70.2°F (21.2°C) and lows from 66.4°F (19.1°C) to 64.2°F (17.9°C), the conditions remain pleasant. Rainfall peaks in February at 3.78" (96mm), but is counterbalanced by the steady presence of 11 hours of daylight. Though the sunshine hours decrease to 6.5 hours by December, the overall ambiance remains inviting.
Weather in January
January in Hilo, Hawaii, kicks off the year with relatively stable weather patterns, manifesting in undulating highs and lows. A signature characteristic of Hilo’s January weather is the slightly higher rainfall of 2.72in compared to the following month. Weather in January »
Weather in February
February is a time of subtle shifts in Hilo's weather pattern. Rainfall increases to peak at 3.78in from January's 2.72in but this change, accompanied by a slightly higher humidity level, lends to the moisture-rich air which contributes to the city's lush tropical vegetation. Weather in February »
Weather in March
March brings a higher frequency of rainy days to Hilo, extending the moist conditions initiated in February. These weather conditions persist throughout the month, maintaining the ecological richness of the city. Even with the higher rainfall levels, the city’s overall weather remains moderate and appealing. Weather in March »
Weather in April
April introduces a drop in rainfall to 1.97in from March's, indicating the onset of a drier period in Hilo. April’s weather makes it a promising time for outdoor activities such as hiking, watersports, and visiting the city's numerous natural attractions. Weather in April »
Weather in May
Come May, the residents of Hilo, Hawaii, experience lesser rain showers and progressively long daylight hours. These factors lend a new vibrancy to the city as the economy reinvigorates with an influx of tourists capitalizing on the favorable weather changes. Weather in May »
Weather in June
June's arrival in Hilo signals the start of summer, with pleasant weather that encourages vibrant outdoor life and activities. June’s striking feature is the lengthened daylight hours that bring out the city's beauty in heightened splendor. Weather in June »
Weather in July
July, the peak of summer in Hilo, has the highest average high temperature of 74.7°F (23.7°C) and the longest daylight hours. The month welcomes visitors with a wonderful blend of sunshine and moderate weather ideal for exploring the city's sights. Weather in July »
Weather in August
August carries the summer's warmth forward with minor increases in high temperatures. Accompanied by long daylight hours and relatively fewer rainfall days, August’s weather highlights the fantastic outdoor potential of this Hawaiian city. Weather in August »
Weather in September
With the warmest sea temperature in the year at 79.3°F (26.3°C), September calls on all sea lovers for a splash in its azure waters. This month witnesses a slight reduction in daylight hours, yet retains a significant amount of sunshine and maintains a pleasant overall climate. Weather in September »
Weather in October
October beings a heightened rainfall reaching 2.80in, with the weather cooling down marginally from September. The change imbues Hilo with a softer, more serene appeal compared to the summer months. Yet, notwithstanding the gentle change in the city's atmosphere, the sea remains comfortably warm. Weather in October »
Weather in November
November ushers in slightly cooler weather in Hilo compared to the previous month's, with the high temperature matching April’s 72.9°F (22.7°C). The coolness accompanied by a slight increase in rainfall indicates the onset of winter. Weather in November »
Weather in December
December marks the official commencement of winter in Hilo, with the low temperature dropping to 66.4°F (19.1°C). The mild winter climate blended with modest rainfall provides a beautiful end to the year. The weather offers a comfortable exploration of the city's winter landscapes and the sea remains fairly warm for marine enjoyment. Weather in December »
Updated: Feb 10, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the least humid month in Hilo?
January, May through July, with an average relative humidity of 78%, are the least humid months.
How much does it rain in Hilo?
In Hilo, during the entire year, the rain falls for 227.7 days and collects up to 27.83" (707mm) of precipitation.
What is the month with the lowest UV index in Hilo?
January through April, with an average maximum UV index of 5, are months with the lowest UV index.
What is the wettest month in Hilo?
The month with the most rainfall in Hilo is February, when the rain falls for 16.7 days and typically aggregates up to 3.78" (96mm) of precipitation.
What part of the year is the coldest in Hilo?
With average high temperatures of 69.6°F (20.9°C) and lows of 64°F (17.8°C), March is the coldest month in Hilo.
What is the most humid month in Hilo?
With an average relative humidity of 80%, March is the most humid month in Hilo, Hawaii.
When is the ocean coldest in Hilo?
With an average ocean temperature of 75.7°F (24.3°C), March is the month with the coldest seawater in Hilo.
When is the highest UV index in Hilo?
May through December, with an average maximum UV index of 6, are months with the highest UV index in Hilo, Hawaii.
What is the driest month in Hilo?
June is the month with the least rainfall in Hilo, Hawaii. Rain falls for 17.3 days and accumulates 1.1" (28mm) of precipitation.
When are the longest days in Hilo?
The month with the longest days in Hilo, Hawaii, is June, with an average of 13h and 18min of daylight.
What month has the most sunshine in Hilo?
The month with the most sunshine in Hilo is June, with an average of 10.9h of sunshine.
What time of the year is the hottest in Hilo?
In Hilo, August records the average highest temperatures, peaking at 75.4°F (24.1°C) and reaching a low of 68.9°F (20.5°C).
When is the ocean warmest in Hilo?
With an average ocean temperature of 79.3°F (26.3°C), September is the month with the warmest seawater in Hilo.
What is the month with the shortest days in Hilo?
December has the shortest days of the year in Hilo, with an average of 11h and 0min of daylight.
Is there Daylight Saving Time (DST) in Hilo?
Hilo does not utilize Daylight Saving Time (DST). HST timezone is used throughout the entire year.
What is the month with the least sunshine in Hilo?
The month with the least sunshine in Hilo, Hawaii, is December, with an average of 6.5h of sunshine.
Average temperature
Hilo, HI
The warmest month (with the highest average high temperature) is August (75.4°F).
The month with the lowest average high temperature is March (69.6°F).
The month with the highest average low temperature is September (70°F).
The coldest month (with the lowest average low temperature) is March (64°F).
Average pressure
Hilo, HI
- Average pressure in January:
30"Hg - Average pressure in February:
30.01"Hg - Average pressure in March:
30.04"Hg - Average pressure in April:
30.05"Hg - Average pressure in May:
30.04"Hg - Average pressure in June:
30.02"Hg
- Average pressure in July:
30"Hg - Average pressure in August:
29.98"Hg - Average pressure in September:
29.97"Hg - Average pressure in October:
29.97"Hg - Average pressure in November:
29.99"Hg - Average pressure in December:
29.99"Hg
The month with the highest atmospheric pressure is April (30.05"Hg).
The months with the lowest atmospheric pressure are September and October (29.97"Hg).
Average wind speed
Hilo, HI
- Average wind speed in January:
7mph - Average wind speed in February:
7.4mph - Average wind speed in March:
7.5mph - Average wind speed in April:
7.5mph - Average wind speed in May:
7mph - Average wind speed in June:
7.1mph
- Average wind speed in July:
7.1mph - Average wind speed in August:
7.6mph - Average wind speed in September:
7mph - Average wind speed in October:
6.7mph - Average wind speed in November:
7mph - Average wind speed in December:
6.9mph
The windiest month (with the highest average wind speed) is August (7.6mph).
The calmest month (with the lowest average wind speed) is October (6.7mph).
Average humidity
Hilo, HI
The month with the highest relative humidity is March (80%).
The months with the lowest relative humidity are January, May, June and July (78%).
Average rainfall
Hilo, HI
- Average rainfall in January:
2.72" - Average rainfall in February:
3.78" - Average rainfall in March:
3.15" - Average rainfall in April:
1.97" - Average rainfall in May:
1.38" - Average rainfall in June:
1.1"
- Average rainfall in July:
1.61" - Average rainfall in August:
2.52" - Average rainfall in September:
1.81" - Average rainfall in October:
2.8" - Average rainfall in November:
2.36" - Average rainfall in December:
2.64"
The wettest month (with the highest rainfall) is February (3.78").
The driest month (with the least rainfall) is June (1.1").
Average rainfall days
Hilo, HI
- Average rainfall days in January:
13.3 days - Average rainfall days in February:
16.7 days - Average rainfall days in March:
22.9 days - Average rainfall days in April:
21.3 days - Average rainfall days in May:
20.2 days - Average rainfall days in June:
17.3 days
- Average rainfall days in July:
17.8 days - Average rainfall days in August:
19.5 days - Average rainfall days in September:
19.2 days - Average rainfall days in October:
20.1 days - Average rainfall days in November:
21 days - Average rainfall days in December:
18.4 days
The month with the highest number of rainy days is March (22.9 days).
The month with the least rainy days is January (13.3 days).
Average sea temperature
Hilo, HI
The best month for swimming (with the highest average sea temperature) is September (79.3°F).
The coldest month (with the lowest average sea temperature) is March (75.7°F).
Average daylight / Average sunshine
Hilo, HI
- Average daylight in January:
11h and 1min - Average daylight in February:
11h and 3min - Average daylight in March:
12h and 1min - Average daylight in April:
12h and 4min - Average daylight in May:
13h and 1min - Average daylight in June:
13h and 2min
- Average daylight in July:
13h and 1min - Average daylight in August:
12h and 5min - Average daylight in September:
12h and 1min - Average daylight in October:
11h and 4min - Average daylight in November:
11h and 1min - Average daylight in December:
11h and 0min
The month with the longest days is June (Average daylight: 13h and 18min).
The month with the shortest days is December (Average daylight: 11h and 0min).
- Average sunshine in January:
7h and 5min - Average sunshine in February:
8h and 2min - Average sunshine in March:
7h and 3min - Average sunshine in April:
8h and 5min - Average sunshine in May:
10h and 4min - Average sunshine in June:
10h and 5min
- Average sunshine in July:
10h and 4min - Average sunshine in August:
9h and 0min - Average sunshine in September:
8h and 5min - Average sunshine in October:
7h and 2min - Average sunshine in November:
6h and 4min - Average sunshine in December:
6h and 3min
The month with the most sunshine is June (Average sunshine: 10h and 54min).
The month with the least sunshine is December (Average sunshine: 6h and 30min).
Average sunshine days
Hilo, HI
- Average sunshine days in January:
12.1 days - Average sunshine days in February:
6 days - Average sunshine days in March:
3.3 days - Average sunshine days in April:
1.9 days - Average sunshine days in May:
3.3 days - Average sunshine days in June:
3.3 days
- Average sunshine days in July:
3.2 days - Average sunshine days in August:
1.8 days - Average sunshine days in September:
2.5 days - Average sunshine days in October:
3.8 days - Average sunshine days in November:
3.1 days - Average sunshine days in December:
6.2 days
The month with the most sunshine days is January (12.1 days).
The month with the least sunshine days is August (1.8 days).
Average UV index
Hilo, HI
The months with the highest UV index are May, June, July, August, September, October, November and December (UV index 6).
The months with the lowest UV index are January, February, March and April (UV index 5).
Average cloud cover
Hilo, HI
The month with the most cloud cover is March (Cloud cover 42).
The month with the least cloud cover is January (Cloud cover 26).
Average visibility
Hilo, HI
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Hilo, Hawaii, USA
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