Ewa Beach, Hawaii climate: Normal weather by month, frost dates and records
Ewa Beach's normal year runs from 62°F January nights to 87°F August afternoons, with 17.1 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 24.1°C, January lows of 17°C, August highs of 31°C, 433 mm of precipitation a year.
- NOAA stationEwa Beach Usgs 702.2
- Station IDUSC00511918
- Location21.32°N 158.00°W
- Elevation5 ft (2 m)
- Population (census place)15,388
On October 14, the normal high in Ewa Beach is 86°F and the normal low 69°F, and the chance of measurable rain or snow is 23%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Ewa Beach.
- Jan 80° 62°
- Feb 80° 63°
- Mar 81° 64°
- Apr 82° 66°
- May 84° 67°
- Jun 86° 69°
- Jul 87° 71°
- Aug 87° 71°
- Sep 87° 70°
- Oct 86° 69°
- Nov 84° 67°
- Dec 81° 65°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
What is the weather like in Ewa Beach each month?
August is the warmest month, with normal highs of 87°F; January the coldest, with normal lows of 62°F. The most precipitation falls in March (2.72 in), the least in June (0.39 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 80°F | 62°F | 71.0°F | 1.84 | 10 | <1 | <1 | 11 h |
| February | 80°F | 63°F | 71.4°F | 1.71 | 8 | <1 | <1 | 11 h 30 min |
| March | 81°F | 64°F | 72.2°F | 2.72 | 9 | <1 | <1 | 12 h |
| April | 82°F | 66°F | 74.0°F | 0.80 | 7 | <1 | <1 | 12 h 40 min |
| May | 84°F | 67°F | 75.3°F | 1.02 | 6 | <1 | <1 | 13 h 10 min |
| June | 86°F | 69°F | 77.4°F | 0.39 | 6 | 1 | <1 | 13 h 30 min |
| July | 87°F | 71°F | 78.5°F | 0.49 | 7 | 3 | <1 | 13 h 20 min |
| August | 87°F | 71°F | 79.2°F | 0.84 | 4 | 5 | <1 | 12 h 50 min |
| September | 87°F | 70°F | 78.2°F | 0.76 | 6 | 5 | <1 | 12 h 20 min |
| October | 86°F | 69°F | 77.4°F | 1.72 | 7 | 1 | <1 | 11 h 40 min |
| November | 84°F | 67°F | 75.3°F | 2.21 | 9 | <1 | <1 | 11 h 10 min |
| December | 81°F | 65°F | 73.1°F | 2.56 | 10 | <1 | <1 | 10 h 50 min |
| Year (annual) | 84°F | 67°F | 75.3°F | 17.06 | 86 | 14 | <1 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 27°C | 17°C | 21.7°C | 47 mm |
| February | 27°C | 17°C | 21.9°C | 43 mm |
| March | 27°C | 18°C | 22.3°C | 69 mm |
| April | 28°C | 19°C | 23.3°C | 20 mm |
| May | 29°C | 19°C | 24.1°C | 26 mm |
| June | 30°C | 21°C | 25.2°C | 10 mm |
| July | 30°C | 21°C | 25.8°C | 12 mm |
| August | 31°C | 22°C | 26.2°C | 21 mm |
| September | 31°C | 21°C | 25.7°C | 19 mm |
| October | 30°C | 21°C | 25.2°C | 44 mm |
| November | 29°C | 19°C | 24.1°C | 56 mm |
| December | 27°C | 18°C | 22.8°C | 65 mm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00511918; annual normals. Wet days: 0.01 inch or more; 90°F days and freezing nights: NOAA's day counts. Daylight: sunrise to sunset on the 15th, computed from the latitude.
When is the best weather to visit Ewa Beach?
Normal highs sit between 65°F and 85°F in January, February, March, April, May, November and December. Of those, May has the fewest days with rain (6).
That is a measurement, not a recommendation: it counts the months whose normal afternoon high sits between 65°F and 85°F, where a light layer is enough by day.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00511918.
How hot and how cold does it get in Ewa Beach?
In a normal year in Ewa Beach, 14 days a year reach 90°F, nights almost never fall to freezing and 86 days bring measurable precipitation.
- Days at 90°F or more
- 14a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- fewer than 1a normal year
- Days that stay below freezing
- fewer than 1high of 32°F or less
- Days with 0.01 inch of precipitation
- 86a normal year
The highest temperature in this station's record (since 1960) is 97°F, on September 11, 1988; the lowest is 49°F, on February 9, 1981.
The wettest calendar year on that record is 1982, with 38.11 in.
Source: NOAA NCEI 1991-2020 annual normals, station USC00511918; records: ACIS (NOAA Regional Climate Centers), station USC00511918. Records use complete months only; a month missing more than three days is left out.
How sunny is Ewa Beach?
Over a year 85% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Ewa Beach, 5.7 kWh per square metre a day. June is the sunniest month (88%) and March the cloudiest (79%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 82% | 4.3 |
| February | 81% | 4.8 |
| March | 79% | 5.5 |
| April | 83% | 6.3 |
| May | 86% | 6.8 |
| June | 88% | 7.1 |
| July | 88% | 7.0 |
| August | 87% | 6.7 |
| September | 88% | 6.2 |
| October | 84% | 5.2 |
| November | 82% | 4.3 |
| December | 81% | 3.9 |
Source: NASA POWER solar climatology, 2001-2020 (CERES SYN1deg). Satellite-based, for the 1-degree cell (about 100 km across) around the station, so it describes the area rather than the airport.
How much heating and cooling does Ewa Beach need?
A normal year in Ewa Beach brings 1 heating degree days, 100% fewer than the median U.S. place (5,373), and 3,754 cooling degree days, 4.1 times the median (908). No month reaches 300 heating degree days. For gardens and crops, NOAA counts 9,228 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 0 | 186 |
| February | 0 | 181 |
| March | 0 | 222 |
| April | 0 | 272 |
| May | 0 | 319 |
| June | 0 | 372 |
| July | 0 | 420 |
| August | 0 | 442 |
| September | 0 | 398 |
| October | 0 | 383 |
| November | 0 | 308 |
| December | 0 | 253 |
| Year (annual) | 1 | 3,754 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00511918. A degree day is one degree of a day's mean temperature below 65°F (heating) or above it (cooling); utilities use them to estimate energy use.
How does Ewa Beach's climate compare?
Ewa Beach is warmer than 10 of the other 17 places with their own NOAA record in Hawaii, and wetter than 4. Across the 7,247 U.S. stations with normals, its annual mean of 75.3°F is warmer than 99%.
In the Köppen classification computed from these normals, Ewa Beach is BSh: hot semi-arid steppe. What the classes mean.
Places with the most similar year elsewhere
Measured month by month on the normal high, low and precipitation, among places of 20,000 or more people in other states:
Source: NOAA NCEI 1991-2020 normals for every station PlainClimate covers. Similarity: the root-mean-square difference of the 36 monthly figures, precipitation weighted so an inch counts like 6°F.
Which places near Ewa Beach share this climate record?
6 places have no NOAA station with 1991-2020 normals of their own, and this station is the nearest full record. A place's own climate can differ from these figures, by several degrees where it sits much higher or lower than the station, nearer the coast, or inside a large city's heat; for the larger places the next nearest records are named with their yearly mean, so the spread around them is visible, and places of 50,000 or more have their own page with NOAA's gridded normals.
- Waipahu, HI39,871 people · 5 mi N
- Ewa Gentry, HI26,738 people · 2 mi NW
- Ocean Pointe, HI16,276 people · 2 mi W
- Waikele, HI7,950 people · 6 mi N
- West Loch Estate, HI6,441 people · 4 mi NW
- Iroquois Point, HI5,506 people · 1 mi E
Source: Census Bureau 2024 Gazetteer (place centers) and Vintage 2024 population estimates. Distance and direction from the station to each place's center.
Questions about Ewa Beach's climate
What is the coldest month in Ewa Beach?
January, with a normal high of 80°F and a normal low of 62°F. The warmest is August (87°F by day, 71°F at night).
Does it snow in Ewa Beach?
Rarely: NOAA's normal is no measurable snow a year.
What is the rainiest month in Ewa Beach?
March, with 2.72 in of precipitation in a normal year; the driest is June with 0.39 in.
What plant hardiness zone is Ewa Beach in?
The USDA's 2023 map puts Ewa Beach in zone 12b in ZIP code 96706, the nearest ZIP area. By the same method at Ewa Beach's NOAA station, the coldest night of a typical year reaches 55°F (23 years, 1991-2020): zone 12a.
Nearby and next
- Hawaii climateThe statewide normals and every place in the state
- Ewa Kalaeloa Airport, HI4 miles from this station, 77.0°F a year
- Honolulu, HI4 miles from this station, 78.0°F a year
- Puu Manawahua 725.6, HI9 miles from this station, 70.5°F a year
- Waikiki 717.2, HI12 miles from this station, 77.6°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made