Climate Insights for Kapa‘a

Kauai County, Hawaii, United States

Hottest
September
27°C peak
Coldest
February
21°C low
Wettest
March
107mm rain
Best to Visit
January, February, April
Mild temps & low rain

Climate Overview

The climate in Kapa‘a is warm and mild. The average annual temperature is 24°C and approximately 943mm of precipitation falls per year. Kapa‘a receives a notable amount of rainfall throughout the year, including during its driest month. Kapa‘a is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: September, August, October. The coldest months are February, March, January, when temperatures can drop to 21°C.

Temperature

10° 15° 20° 25° 30° Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Max: 24° Average: 22° Min: 21° Feb Max: 23° Average: 22° Min: 21° Mar Max: 24° Average: 22° Min: 21° Apr Max: 24° Average: 23° Min: 22° May Max: 25° Average: 23° Min: 22° Jun Max: 26° Average: 24° Min: 23° Jul Max: 26° Average: 25° Min: 24° Aug Max: 27° Average: 25° Min: 24° Sep Max: 27° Average: 25° Min: 24° Oct Max: 26° Average: 25° Min: 24° Nov Max: 25° Average: 24° Min: 23° Dec Max: 24° Average: 23° Min: 22°
Max
Average
Min

Kapa‘a has relatively stable temperatures year-round, staying within a 6°C range. The warmest month is September, when average highs reach 27°C and the mean temperature sits around 25°C. February is the coolest month, with minimum temperatures around 21°C and an average of 22°C. Daily temperature variation is modest, with an average difference of 2°C between highs and lows.

Precipitation

0mm 25mm 50mm 75mm 100mm 125mm 150mm Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Precipitation: 58mm Feb Precipitation: 77mm Mar Precipitation: 107mm Apr Precipitation: 90mm May Precipitation: 71mm Jun Precipitation: 79mm Jul Precipitation: 74mm Aug Precipitation: 68mm Sep Precipitation: 63mm Oct Precipitation: 83mm Nov Precipitation: 71mm Dec Precipitation: 102mm
Precipitation

Kapa‘a is a moderately rainy area, receiving approximately 943mm of precipitation annually, which averages out to around 79mm per month. The wettest month is March, averaging 107mm of rainfall. December and April also tend to see above-average precipitation. The driest month is January, with just 58mm. That's 49mm less than March, the wettest month. Rainfall is relatively evenly distributed throughout the year, so there is no pronounced dry or wet season to plan around.

Wind

0km/h 5km/h 10km/h 15km/h 20km/h Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Wind Speed: 16km/h Feb Wind Speed: 18km/h Mar Wind Speed: 18km/h Apr Wind Speed: 18km/h May Wind Speed: 17km/h Jun Wind Speed: 18km/h Jul Wind Speed: 20km/h Aug Wind Speed: 18km/h Sep Wind Speed: 17km/h Oct Wind Speed: 16km/h Nov Wind Speed: 18km/h Dec Wind Speed: 17km/h
Wind Speed

Kapa‘a is mildly breezy, with an average annual wind speed of 18km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is July, averaging 20km/h, though still comfortable for most outdoor activities. The calmest conditions occur in January, with average winds dropping to 16km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 4km/h between the calmest and windiest months.

Seasons

Winter
Dec 21
Spring
Mar 20
Summer
Jun 21
Autumn
Sep 23

7 days until Autumn

It is currently summer in Kapa‘a, which began on June 21, 2026. Kapa‘a is in the Northern Hemisphere, where spring begins in March, summer in June, autumn in September, and winter in December. The warmest period peaks in September at around 27°C, while the coldest stretch bottoms out in February near 21°C. Autumn is next, beginning on September 23, 2026 (7 days from now).

Spring

Temperatures range from 21 to 25°C. Precipitation is moderate at around 268mm for the season, averaging 89mm per month. Winds are moderate at around 18km/h. An umbrella or waterproof jacket is advisable as spring showers are frequent.

Summer

Temperatures range from 23 to 27°C. Precipitation is moderate at around 221mm for the season, averaging 74mm per month. Winds are moderate at around 19km/h. Light, breathable clothing is ideal. Perfect conditions for outdoor activities.

Autumn

Temperatures range from 23 to 27°C. Precipitation is moderate at around 217mm for the season, averaging 72mm per month. Winds are moderate at around 17km/h. A waterproof jacket and sturdy footwear are recommended as rain becomes more frequent.

Winter

Temperatures range from 21 to 24°C. Precipitation is moderate at around 237mm for the season, averaging 79mm per month. Winds are moderate at around 17km/h. A light jacket or sweater is usually sufficient, though cooler evenings may call for an extra layer.

Best Time to Visit

Jan 22°
Feb 22°
Mar 22°
Apr 23°
May 23°
Jun 24°
Jul 25°
Aug 25°
Sep 25°
Oct 25°
Nov 24°
Dec 23°

The best time to visit Kapa‘a is during January, February, April, May, June, July, October and November, when the weather is most comfortable for travellers. During these months, average temperatures hover around 24°C with modest rainfall averaging 75mm per month. By contrast, September can be uncomfortably hot with temperatures reaching 27°C. Despite being the best months overall, some rain is still likely. Pack a waterproof layer and plan a mix of indoor and outdoor activities.

Monthly Climate Data

The table below shows monthly climate averages for Kapa‘a based on historical weather data. Min and max temperatures represent typical overnight lows and afternoon highs for each month, shown in degrees Celsius (°C). Precipitation is measured in millimetres (mm) and indicates the average total rainfall per month. Wind speed is the average sustained speed in kilometres per hour (km/h). All values are based on averages from over 10 years of historical weather data. The current month is highlighted for quick reference.

Month
Min Temperature
Max Temperature
Wind Speed
Precipitation
Snow
Jan
21 °C
24 °C
16 km/h
58 mm
0 cm
Feb
21 °C
23 °C
18 km/h
77 mm
0 cm
Mar
21 °C
24 °C
18 km/h
107 mm
0 cm
Apr
22 °C
24 °C
18 km/h
90 mm
0 cm
May
22 °C
25 °C
17 km/h
71 mm
0 cm
Jun
23 °C
26 °C
18 km/h
79 mm
0 cm
Jul
24 °C
26 °C
20 km/h
74 mm
0 cm
Aug
24 °C
27 °C
18 km/h
68 mm
0 cm
Sep Current
24 °C
27 °C
17 km/h
63 mm
0 cm
Oct
24 °C
26 °C
16 km/h
83 mm
0 cm
Nov
23 °C
25 °C
18 km/h
71 mm
0 cm
Dec
22 °C
24 °C
17 km/h
102 mm
0 cm
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Metric (°C, km/h)