Kailua, Hawaii Weather
Storm intensity ebbs slightly. Day 93 of summer. Read this microseason across nine climate regions →
Kailua weather forecast — hour by hour, 7-day outlook, NOAA radar
Conditions updated 1:50 AM HST · Open-Meteo
- TodaySep 21Light Drizzle later63%0.03″83°77°—
- TuesdaySep 22Light Showers100%0.23″84°75°+1°
- WednesdaySep 23Light Showers86%0.26″83°74°-1°
- ThursdaySep 24Drizzle88%0.04″82°78°-1°
- FridaySep 25Drizzle73%0.08″83°76°+1°
- SaturdaySep 26Drizzle72%0.04″81°77°-2°
- SundaySep 27Light Drizzle67%0.02″82°77°+1°
Air quality now AQI 46 · Good
AQI 46 (Good), driven by PM2.5. AQI flat over the last 6 hours (within ±4 points). PM2.5 at 10.6 µg/m³ (AQI 54), ratio 0.58 with 13 mph wind — characteristic of long-range haze transport rather than a local source.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion during the projected peak around 1 PM.
What's driving it
PM × Wind × Precip
PM2.5 at 10.6 µg/m³ (AQI 54), ratio 0.58 with 13 mph wind — characteristic of long-range haze transport rather than a local source.
- PM2.5/PM10
- 0.58
- Wind
- breezy
- Recent rain
- 0h in last 6h
- Pattern
- transport
Trends
Seven days of AQI and PM2.5.
Hourly air-quality data from the Copernicus Atmosphere Monitoring Service, charted across the past and next several days. Dashed lines mark the AQI breakpoints at 50 (Good → Moderate) and 100 (Moderate → Unhealthy for Sensitive Groups).
September dries up ditches or breaks down bridges.
- Moonrise
- 2:48 PM
- Moonset
- 1:51 AM
- In sign
- ♑︎ Capricorn
Storm intensity ebbs slightly
Read this microseason across nine climate regions →
All 72 microseasons on the year wheel →
Kailua at a glance
- Today vs. normal: Today averages 80°F (high 83°F, low 77°F), about the 79°F normal for Sep 21
- Last frost: None — no 32°F night in 1991–2020 (NOAA station 7 km away)
- Microseason: Sep 21–25
- Planting calendar: September — plant lettuce, peas, tomatoes, peppers, beans, squash; harvest tomatoes, peppers, beans, summer squash, winter squash
15-Day Forecast — Kailua
- Mon83°77°63%
- Tue84°75°100%
- Wed83°74°86%
- Thu82°78°88%
- Fri83°76°73%
- Sat81°77°72%
- Sun82°77°67%
- Mon83°77°75%
- Tue81°75°67%
- Wed81°75°66%
- Thu82°76°70%
- Fri81°72°51%
- Sat81°72°57%
- Sun82°74°81%
- Mon81°74°70%
Forecast data from Open-Meteo (CC BY 4.0).
Live wind & temperature near Kailua
Interactive wind and temperature map centered on Kailua — it loads in your browser. Open the full weather map.
Right now in the garden
Year-round growing
As of September 21, sowing here runs through the year. Freezes are uncommon, so there is no frost date to plan around; heat and rainfall set the calendar instead. This city's planting calendar for September: plant lettuce, peas, tomatoes, peppers, beans, and squash; harvest tomatoes, peppers, beans, summer squash, and winter squash.
Sun & seasons in Kailua
Kailua sits in Honolulu County, where the year’s longest day runs 13h 26m of daylight and its shortest just 10h 50m — a swing of +2h 36m between the June and December solstices.
Honolulu, the state’s largest city, lies about 8 miles to the WSW. The nearest town Kailua tracks is Honolulu, roughly 8 miles to the WSW.
Air quality in Kailua
Air quality in Kailua’s county has trended dirtier since 2020; its cleanest year on record was 2020 (median AQI 28). See the full air-quality history for Kailua.
Planting calendar
| Month | Plant | Harvest |
|---|---|---|
| January | lettuce, peas, spinach, radishes, tomatoes, peppers, beans, squash | lettuce, peas, spinach, radishes, tomatoes, peppers, beans, summer squash, winter squash |
| February | lettuce, peas, spinach, radishes, tomatoes, peppers, beans, squash | lettuce, peas, spinach, radishes, tomatoes, peppers, beans, summer squash, winter squash |
| March | lettuce, spinach, radishes, tomatoes, peppers, beans, squash | lettuce, peas, spinach, radishes, tomatoes, peppers, beans, summer squash, winter squash |
| April | tomatoes, peppers, beans, squash | lettuce, peas, spinach, radishes, tomatoes, peppers, beans, summer squash, winter squash |
| May | tomatoes, peppers, beans, squash | tomatoes, peppers, beans, summer squash, winter squash |
| June | tomatoes, peppers, beans, squash | tomatoes, peppers, beans, summer squash, winter squash |
| July | tomatoes, peppers, beans, squash | tomatoes, peppers, beans, summer squash, winter squash |
| August | tomatoes, peppers, beans, squash | tomatoes, peppers, beans, summer squash, winter squash |
| September | lettuce, peas, tomatoes, peppers, beans, squash | tomatoes, peppers, beans, summer squash, winter squash |
| October | lettuce, peas, spinach, tomatoes, peppers, beans, squash | tomatoes, peppers, beans, summer squash, winter squash |
| November | lettuce, peas, spinach, radishes, tomatoes, peppers, beans, squash | tomatoes, peppers, beans, summer squash, winter squash |
| December | lettuce, peas, spinach, radishes, tomatoes, peppers, beans, squash | lettuce, peas, spinach, radishes, tomatoes, peppers, beans, summer squash, winter squash |
A year in weather
August is Kailua's warmest stretch (~80°F) and January its coldest (~72°F); precipitation crests in December at 5.5 inches and ebbs in June to 1.3 inches.
| Month | Mean temp | Precip | Rainy days |
|---|---|---|---|
| January | 72° | 4.8″ | 16 |
| February | 72° | 4.5″ | 13 |
| March | 73° | 5.4″ | 15 |
| April | 74° | 3.3″ | 13 |
| May | 76° | 2.4″ | 12 |
| June | 78° | 1.3″ | 11 |
| July | 79° | 1.9″ | 15 |
| August | 80° | 2.0″ | 13 |
| September | 80° | 2.6″ | 13 |
| October | 78° | 3.5″ | 14 |
| November | 76° | 5.4″ | 16 |
| December | 74° | 5.5″ | 19 |
Regional context
Similar climates Maunawili, HI, Kaneohe, HI, Waimanalo, HI
Drawing on NOAA NCEI 1991-2020 normals, Kailua's January averages 72°F and July 79°F — 8°F apart — while precipitation totals roughly 42.4 inches over some 169 days.
Cool-season fronts carry Kailua's rain: December logs 5.5 inches on 18.7 days, against June's 1.3 inches on 11.0 — winter does the heavy lifting in Kailua. It is a winter-storm rhythm Kailua shares with places like Maunawili, HI, Kaneohe, HI and Waimanalo, HI.
Freezes are uncommon in Kailua, where the coldest month averages 72°F; cool-season crops grow fall through spring. Summer heat in August (about 80°F) is the binding constraint, not cold. Kailua beds by a wall stay warmer at night.
Similar climates: Maunawili, HI, Kaneohe, HI, Waimanalo, HI, Waimanalo Beach, HI, Heeia, HI.
Frequently asked
- When does it freeze in Kailua?
- Freezes don't happen in Kailua in a normal year — no 32°F night at the nearest NOAA station across 1991–2020, with Kailua's coldest month near 72°F.
- What is the rainy season in Kailua?
- December is the wettest month in Kailua, about 5.5 inches on average; the year totals roughly 42 inches.
- What is the warmest month in Kailua?
- The warmest stretch in Kailua comes in August, around 80°F on average.
- What is the coldest month in Kailua?
- On average January is the chilliest month in Kailua, about 72°F.
- When can I start a vegetable garden in Kailua?
- Start whenever suits in Kailua — freezes are too rare for a frost date — and save lettuce and peas for Kailua's coolest stretch, near 72°F.
- How many rainy days does Kailua get?
- Kailua records around 169 days of measurable precipitation annually.
- What hardiness zone is Kailua?
- Kailua's hardiness zone tracks its winter low; with January near 72°F, check the USDA ZIP map for the exact zone.
- What is the 10-day forecast for Kailua?
- Kailua's extended outlook — daily high and low temperatures and precipitation chances for each upcoming day — is in the daily forecast above.
- Will it rain this week in Kailua?
- See this week's day-by-day rain chances for Kailua in the daily forecast above, and the next 24 hours in the hourly chart.
- What is the weather like right now in Kailua?
- Current conditions for Kailua and the next 24 hours — temperature, precipitation chance, and wind by the hour — are in the hourly forecast chart above.
- How often is the Kailua forecast updated?
- The Kailua forecast on this page is built from Open-Meteo weather-model data and refreshes regularly through the day.
- When are sunrise and sunset in Kailua?
- Today's sunrise and sunset times for Kailua are in the Almanac section above, along with civil dawn, civil dusk, and day length. Day length is longest near the summer solstice and shortest near the winter solstice.
- How accurate is the weather forecast for Kailua?
- The next few days in Kailua's forecast are the most reliable; accuracy declines beyond about a week as weather-model uncertainty grows.
ZIP codes in Kailua
- 96734