Honolulu, Hawaii Weather
Storm intensity ebbs slightly. Day 93 of summer. Read this microseason across nine climate regions →
Honolulu weather forecast — hour by hour, 7-day outlook, NOAA radar
Conditions updated 2:30 AM HST · Open-Meteo
- TodaySep 21Mostly Clear later69%—85°76°—
- TuesdaySep 22Mostly Clear98%0.07″87°75°+2°
- WednesdaySep 23Drizzle76%0.11″85°74°-2°
- ThursdaySep 24Light Drizzle94%0.11″84°76°-1°
- FridaySep 25Light Drizzle90%0.11″83°75°-1°
- SaturdaySep 26Drizzle93%0.25″82°76°-1°
- SundaySep 27Light Drizzle75%0.02″83°76°+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 10.3 µg/m³ (AQI 53), ratio 0.58 with 12 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 2 PM.
What's driving it
PM × Wind × Precip
PM2.5 at 10.3 µg/m³ (AQI 53), ratio 0.58 with 12 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
- 1:52 AM
- In sign
- ♑︎ Capricorn
Storm intensity ebbs slightly
Read this microseason across nine climate regions →
All 72 microseasons on the year wheel →
Honolulu at a glance
- Today vs. normal: Today averages 81°F (high 85°F, low 76°F), about the 81°F normal for Sep 21
- Last frost: None — no 32°F night in 1991–2020 (NOAA station 5 km away)
- Microseason: Sep 21–25
- Planting calendar: September — plant tomatoes, peppers, beans, squash; harvest summer squash, winter squash
15-Day Forecast — Honolulu
- Mon85°76°33%
- Tue87°75°100%
- Wed85°74°76%
- Thu84°76°95%
- Fri83°75°89%
- Sat82°76°88%
- Sun83°76°76%
- Mon84°76°59%
- Tue85°74°61%
- Wed83°74°68%
- Thu83°74°61%
- Fri81°72°58%
- Sat82°71°60%
- Sun85°73°76%
- Mon84°73°59%
Forecast data from Open-Meteo (CC BY 4.0).
Live wind & temperature near Honolulu
Interactive wind and temperature map centered on Honolulu — 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 tomatoes, peppers, beans, and squash; harvest summer squash and winter squash.
Sun & seasons in Honolulu
Honolulu 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 is the state’s largest city. The nearest town Honolulu tracks is Kailua, roughly 8 miles to the ENE.
Air quality in Honolulu
Air quality in Honolulu’s county has trended dirtier since 2020; its cleanest year on record was 2020 (median AQI 28). See the full air-quality history for Honolulu.
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 | radishes, tomatoes, peppers, beans, squash | lettuce, peas, spinach, radishes, tomatoes, peppers, beans, summer squash, winter squash |
| March | tomatoes, peppers, beans, squash | lettuce, peas, spinach, radishes, tomatoes, peppers, beans, summer squash, winter squash |
| April | tomatoes, peppers, beans, squash | tomatoes, peppers, beans, summer squash, winter squash |
| May | tomatoes, peppers, beans, squash | tomatoes, peppers, beans, summer squash, winter squash |
| June | tomatoes, peppers, 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, summer squash, winter squash |
| September | tomatoes, peppers, beans, squash | summer squash, winter squash |
| October | lettuce, peas, tomatoes, peppers, beans, squash | 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
The year in Honolulu tops out in August (~82°F) and dips lowest in January (~73°F), with March wettest at 3.2 inches and June driest at 0.6 inches.
| Month | Mean temp | Precip | Rainy days |
|---|---|---|---|
| January | 73° | 2.4″ | 11 |
| February | 74° | 2.0″ | 10 |
| March | 75° | 3.2″ | 11 |
| April | 76° | 1.2″ | 10 |
| May | 78° | 1.0″ | 8 |
| June | 80° | 0.6″ | 8 |
| July | 81° | 0.7″ | 10 |
| August | 82° | 0.7″ | 9 |
| September | 81° | 1.0″ | 10 |
| October | 80° | 2.2″ | 10 |
| November | 78° | 2.6″ | 12 |
| December | 75° | 3.0″ | 14 |
Regional context
Similar climates Maunawili, HI, Halawa, HI, Aiea, HI
In Honolulu, NOAA NCEI 1991-2020 normals put January near 73°F and July near 81°F — an 8°F seasonal arc — with about 20.7 inches of precipitation over 123 rainy or snowy days.
Honolulu's moisture rides winter storm tracks: March brings 3.2 inches over 11.3 wet days, while June sees only 0.6 inches across 8.1 days in the dry warm season. It is a winter-storm rhythm Honolulu shares with places like Maunawili, HI, Halawa, HI and Aiea, HI.
With a coldest-month mean of 73°F, Honolulu stays mostly frost-free and grows year-round. The August peak near 82°F is Honolulu's real limit, pushing cool-season vegetables to spring and fall. Honolulu's open lawns chill fastest on clear nights.
Similar climates: Maunawili, HI, Halawa, HI, Aiea, HI, Kaneohe, HI, Heeia, HI.
Frequently asked
- When does it freeze in Honolulu?
- In Honolulu, a freeze is absent from the record: the nearest NOAA station never dropped to 32°F in 1991–2020, and Honolulu's coldest month runs 73°F.
- What is the rainy season in Honolulu?
- March is the wettest month in Honolulu, about 3.2 inches on average; the year totals roughly 21 inches.
- What is the warmest month in Honolulu?
- Honolulu peaks in August, when the mean runs near 82°F.
- What is the coldest month in Honolulu?
- January is Honolulu's coldest month, averaging about 73°F.
- When can I start a vegetable garden in Honolulu?
- Any season works in Honolulu: without a reliable freeze, Honolulu's heat, not frost, decides when greens and tomatoes do best.
- How many rainy days does Honolulu get?
- Honolulu averages about 123 days with measurable rain or snow each year.
- What hardiness zone is Honolulu?
- Because Honolulu bottoms near 73°F in January, that winter low sets Honolulu's USDA zone — verify by ZIP.
- What is the 10-day forecast for Honolulu?
- Honolulu'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 Honolulu?
- See this week's day-by-day rain chances for Honolulu in the daily forecast above, and the next 24 hours in the hourly chart.
- What is the weather like right now in Honolulu?
- Current conditions for Honolulu and the next 24 hours — temperature, precipitation chance, and wind by the hour — are in the hourly forecast chart above.
- How often is the Honolulu forecast updated?
- The Honolulu forecast on this page is built from Open-Meteo weather-model data and refreshes regularly through the day.
- When are sunrise and sunset in Honolulu?
- Today's sunrise and sunset times for Honolulu 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 Honolulu?
- The next few days in Honolulu's forecast are the most reliable; accuracy declines beyond about a week as weather-model uncertainty grows.
ZIP codes in Honolulu
- 96801
- 96802
- 96803
- 96804
- 96805
- 96806
- 96807
- 96808
- 96809
- 96810
- 96811
- 96812
- 96813
- 96814
- 96815
- 96816
- 96817
- 96818
- 96819
- 96820
- 96821
- 96822
- 96823
- 96825
- 96826
- 96828
- 96830
- 96836
- 96837
- 96838
- 96839
- 96840
- 96841
- 96843
- 96844
- 96846
- 96847
- 96848
- 96849
- 96850
- 96858
- 96859
- 96898