Koolauloa, United States experiences average highs of 26°C (79°F) and lows of 23°C (73°F) throughout the year. Rainfall is moderate, averaging about 8 rainy days per month. Sunshine is abundant, averaging about 11 hours per day. Average highs have warmed by 0.6°C (1.1°F) across the available records.
Koolauloa, United States Weather & Climate 2026
Monthly climate averages for Koolauloa, United States. Based on 10-year ERA5 reanalysis data.
Climate Overview
Drier season: Jan–Nov 
Wetter season: Feb–Dec At-a-Glance Climate Summary
Live Weather & Air Quality
Key figures
Climate Score
8.7/10
Best: January, February, March, November, December
UV Index
7
High
Temperature 26°C / 23°C
Feels Like 29°C / 24°C
Rainy Days 8
Rainfall 35 mm
Sunshine 11 h
Humidity 74%
Wind Speed 21 km/h
Dew Point 19°C
Hottest Month
28°C
August
Avg Low24°C
Rain7days
Coldest Month
21°C
February
Avg High24°C
Rain9days
Driest Month
5days
September
Avg High28°C
Avg Low24°C
Windiest Month
24 km/h
July (Gusts 52)
Sea Temperature
24°C – 27°C
Warmest water: October (
26.9°C
)
Worst Time to Visit
Consider avoiding July, August, September, October due to less favorable weather conditions.
Sun Position
Sunrise 05:50
Daylight 13.4h
Sunset 19:17
Live conditions—
Koolauloa on the map · live conditions
Koolauloa, United States
- Continent
- Americas
- Country
- United States
- City
- Koolauloa
- Population
- 15.7K
- Coordinates
- 21.61°, -157.93°
Seasonal Breakdown
Spring
Mar–May
Avg High 25°C
Avg Low 22°C
Rain 11 days/mo
1/3 best months
Summer
Jun–Aug
Avg High 27°C
Avg Low 24°C
Rain 7 days/mo
Autumn
Sep–Nov
Avg High 27°C
Avg Low 24°C
Rain 6 days/mo
1/3 best months
Winter
Dec–Feb
Avg High 25°C
Avg Low 21°C
Rain 8 days/mo
3/3 best months
Climate Charts
Based on historical averages (2016–2025)
Monthly Temperatures
HighLowShaded bands show the typical range across the available yearly records.
Line chart showing monthly temperatures. Jan: 25°C / 21°C . Feb: 24°C / 21°C . Mar: 25°C / 21°C . Apr: 25°C / 22°C . May: 26°C / 22°C . Jun: 27°C / 23°C . Jul: 27°C / 24°C . Aug: 28°C / 24°C . Sep: 28°C / 24°C . Oct: 28°C / 24°C . Nov: 26°C / 23°C . Dec: 25°C / 22°C .
Monthly Rainfall
Rainfall
Bar chart showing monthly rainfall. Jan: 31 mm. Feb: 49 mm. Mar: 49 mm. Apr: 44 mm. May: 39 mm. Jun: 32 mm. Jul: 21 mm. Aug: 22 mm. Sep: 17 mm. Oct: 37 mm. Nov: 23 mm. Dec: 60 mm.
Monthly Humidity
Humidity
Line chart showing monthly humidity. Jan: 74%. Feb: 73%. Mar: 74%. Apr: 74%. May: 74%. Jun: 73%. Jul: 74%. Aug: 73%. Sep: 73%. Oct: 74%. Nov: 74%. Dec: 75%.
Monthly Wind Speed
Wind SpeedGusts
Bar chart showing monthly wind speed. Jan: 20 km/h . Feb: 22 km/h . Mar: 21 km/h . Apr: 22 km/h . May: 21 km/h . Jun: 22 km/h . Jul: 24 km/h . Aug: 23 km/h . Sep: 21 km/h . Oct: 20 km/h . Nov: 22 km/h . Dec: 21 km/h .
Sunshine
Sunshine
Sunshine: Jan: 10h. Feb: 10h. Mar: 11h. Apr: 11h. May: 12h. Jun: 13h. Jul: 12h. Aug: 12h. Sep: 11h. Oct: 11h. Nov: 10h. Dec: 9h.
Sea Temperature
Sea Temperatureswim
Line chart showing monthly sea temperature. Jan: 25°C . Feb: 24°C . Mar: 24°C . Apr: 25°C . May: 25°C . Jun: 25°C . Jul: 26°C . Aug: 26°C . Sep: 27°C . Oct: 27°C . Nov: 26°C . Dec: 25°C .
UV Index
UV Index
Bar chart showing monthly UV index. Jan: UV 6. Feb: UV 7. Mar: UV 8. Apr: UV 8. May: UV 8. Jun: UV 9. Jul: UV 9. Aug: UV 9. Sep: UV 8. Oct: UV 7. Nov: UV 6. Dec: UV 5.
Monthly Daylight Hours
Daylight12h reference
Monthly Dew Point & Comfort
Dew Point Dry Comfortable Humid Muggy Oppressive
Climate Trends
Average highs have warmed by 0.6°C (1.1°F) across the available records. Average rainfall has remained broadly steady.
2016 to 2025
Avg high Avg rainfall
Climate summary
| Last 12 months | All years | |
|---|---|---|
| Hottest month | Aug 2025 · 28°C | Aug · 28°C |
| Coldest month | Feb 2025 · 21°C | Feb · 21°C |
| Wettest month | Dec 2025 · 82 mm | Dec · 60 mm |
| Windiest month | May 2025 · 23 km/h | Jul · 24 km/h |
Month-by-Month Weather Table
January best
Excellent 
February best
Excellent March best
Excellent April
Excellent May
Good June
Excellent July
Good August
Good September
Good October
Good November best
Excellent December best
Excellent | Month | Temp | Feels Like | Rain | Sun | Humidity | UV | Status | Details |
|---|---|---|---|---|---|---|---|---|
| January best | 25°C / 21°C | 26°C / 22°C | 7days (31 mm) Good | 9.8h Good | 74% Muggy | 5.8 High | Excellent | View Details |
| February best | 24°C / 21°C | 26°C / 21°C | 9days (49 mm) Wet | 10h Excellent | 73% Muggy | 6.8 High | Excellent | View Details |
| March best | 25°C / 21°C | 27°C / 22°C | 11days (49 mm) Wet | 10.6h Excellent | 74% Muggy | 7.7 Very High | Excellent | View Details |
| April | 25°C / 22°C | 28°C / 23°C | 12days (44 mm) Wet | 11.3h Excellent | 74% Muggy | 8.1 Very High | Excellent | View Details |
| May | 26°C / 22°C | 29°C / 24°C | 9days (39 mm) Wet | 12h Excellent | 74% Muggy | 8.4 Very High | Good | View Details |
| June | 27°C / 23°C | 30°C / 25°C | 7days (32 mm) Good | 12.5h Excellent | 73% Muggy | 8.8 Very High | Excellent | View Details |
| July | 27°C / 24°C | 30°C / 25°C | 7days (21 mm) Good | 12.3h Excellent | 74% Muggy | 8.8 Very High | Good | View Details |
| August | 28°C / 24°C | 31°C / 26°C | 7days (22 mm) Good | 11.8h Excellent | 73% Muggy | 8.8 Very High | Good | View Details |
| September | 28°C / 24°C | 32°C / 26°C | 5days (17 mm) Good | 11.2h Excellent | 73% Muggy | 8.3 Very High | Good | View Details |
| October | 28°C / 24°C | 31°C / 26°C | 8days (37 mm) Wet | 10.6h Excellent | 74% Muggy | 7.2 Very High | Good | View Details |
| November best | 26°C / 23°C | 28°C / 24°C | 6days (23 mm) Good | 10.1h Excellent | 74% Muggy | 5.9 High | Excellent | View Details |
| December best | 25°C / 22°C | 27°C / 23°C | 8days (60 mm) Wet | 9.3h Good | 75% Muggy | 5.3 High | Excellent | View Details |
Compare Nearby City Climates
Frequently Asked Questions
The best months to visit Koolauloa are January, February, March, November, December, when temperatures are comfortable and rainfall is at its lowest. This is based on 10-year climate averages for Koolauloa, scoring temperature, rainfall, humidity, and sunshine hours.
The hottest month in Koolauloa is August, with average daytime highs of 28°C (82°F). Plan outdoor activities for early morning or late afternoon if visiting during this period.
The coldest month in Koolauloa is February, with average overnight lows of 21°C (69°F). Pack warm layers and expect shorter daylight hours during this period.
The wettest month in Koolauloa is December, averaging 60mm of precipitation across 8 rainy days. An umbrella or waterproof jacket is essential.
The rainy season in Koolauloa runs through April, March, with the heaviest rainfall in April. Based on 10-year averages for Koolauloa.
Koolauloa receives approximately 132 sunshine hours per year. The sunniest month is June with around 13 hours. Based on climate data for Koolauloa.
The least favorable months to visit Koolauloa are July, August, September, October, primarily due to less favorable weather conditions. For the best conditions, consider January, February, March, November, December instead.
The annual average UV index in Koolauloa is 7, classified as high. SPF 30+ sunscreen, sunglasses, and seeking shade between 10:00–16:00 are strongly recommended.
Average humidity in Koolauloa is 74%, classified as moderate. Humidity levels are generally comfortable and should not affect outdoor activities for most people.
Yes — sea temperatures in January, February, March, April, May, June, July, August, September, October, November, December average 25°C (77°F), which is warm and comfortable for swimming and water activities.
Average wind speeds in Koolauloa are 21 km/h (13 mph). The windiest month is July with peak winds reaching 24 km/h (15 mph) (gusts up to 52 km/h / 32 mph).
Koolauloa averages 2 clear-sky days per month with overall cloud cover around 47%. The clearest skies occur in January.
The annual average dew point in Koolauloa is 19°C (66°F), which feels noticeably humid. Summer months may feel slightly sticky, but conditions remain manageable for most people.
Koolauloa has a Hot Semi-Arid climate, classified as BSh under the Köppen system. Arid climates have very low rainfall relative to temperature, with large swings between daytime heat and cool nights.
The 'feels like' temperature in Koolauloa ranges from 24°C (75°F) to 29°C (84°F) on average. Humidity and radiant heat mean it often feels warmer than the thermometer reads, especially in summer months.
Yes, June is a great time to visit Koolauloa. It earns a climate score of 8.7/10 with Excellent.
For June in Koolauloa, pack Umbrella, Breathable clothing, Sunscreen (SPF 30+), Sun hat, Sunglasses. With average highs of 27°C (81°F) and 7 rainy days, these essentials will keep you comfortable.
Data Source
Climate data derived from ERA5 reanalysis (ECMWF), averaged over 2016–2025. Sea surface temperature from marine reanalysis data. Climate scores and seasonal estimates are computed by WorldStats.
Last updated: