Waimanalo, Hawaii climate: Normal weather by month, frost dates and records
Waimanalo's normal year runs from 65°F January nights to 85°F August afternoons, with 42.4 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 24.3°C, January lows of 18°C, August highs of 29°C, 1,078 mm of precipitation a year.
- NOAA stationWaimanalo Experiment F 795.1
- Station IDUSC00519523
- Location21.34°N 157.71°W
- Elevation64 ft (20 m)
- From the center1 miles
- Population (census place)5,634
On October 14, the normal high in Waimanalo is 84°F and the normal low 73°F, and the chance of measurable rain or snow is 46%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Waimanalo.
- Jan 78° 65°
- Feb 78° 65°
- Mar 79° 67°
- Apr 80° 69°
- May 81° 70°
- Jun 83° 73°
- Jul 84° 74°
- Aug 85° 74°
- Sep 85° 74°
- Oct 84° 73°
- Nov 82° 71°
- Dec 79° 68°
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 Waimanalo each month?
August is the warmest month, with normal highs of 85°F; January the coldest, with normal lows of 65°F. The most precipitation falls in December (5.45 in), the least in June (1.26 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 78°F | 65°F | 71.5°F | 4.79 | 16 | <1 | <1 | 11 h |
| February | 78°F | 65°F | 71.7°F | 4.45 | 13 | <1 | <1 | 11 h 30 min |
| March | 79°F | 67°F | 72.6°F | 5.40 | 15 | <1 | <1 | 12 h |
| April | 80°F | 69°F | 74.4°F | 3.26 | 13 | <1 | <1 | 12 h 40 min |
| May | 81°F | 70°F | 75.8°F | 2.43 | 12 | <1 | <1 | 13 h 10 min |
| June | 83°F | 73°F | 78.0°F | 1.26 | 11 | <1 | <1 | 13 h 30 min |
| July | 84°F | 74°F | 79.1°F | 1.86 | 15 | <1 | <1 | 13 h 20 min |
| August | 85°F | 74°F | 79.7°F | 1.97 | 13 | <1 | <1 | 12 h 50 min |
| September | 85°F | 74°F | 79.5°F | 2.62 | 13 | <1 | <1 | 12 h 20 min |
| October | 84°F | 73°F | 78.3°F | 3.54 | 14 | <1 | <1 | 11 h 40 min |
| November | 82°F | 71°F | 76.0°F | 5.40 | 16 | <1 | <1 | 11 h 10 min |
| December | 79°F | 68°F | 73.5°F | 5.45 | 19 | <1 | <1 | 10 h 50 min |
| Year (annual) | 82°F | 70°F | 75.8°F | 42.43 | 169 | 1 | <1 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 26°C | 18°C | 21.9°C | 122 mm |
| February | 26°C | 19°C | 22.1°C | 113 mm |
| March | 26°C | 19°C | 22.6°C | 137 mm |
| April | 27°C | 21°C | 23.6°C | 83 mm |
| May | 27°C | 21°C | 24.3°C | 62 mm |
| June | 29°C | 23°C | 25.6°C | 32 mm |
| July | 29°C | 23°C | 26.2°C | 47 mm |
| August | 29°C | 24°C | 26.5°C | 50 mm |
| September | 30°C | 23°C | 26.4°C | 67 mm |
| October | 29°C | 23°C | 25.7°C | 90 mm |
| November | 28°C | 21°C | 24.4°C | 137 mm |
| December | 26°C | 20°C | 23.1°C | 138 mm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00519523; 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 Waimanalo?
Normal highs sit between 65°F and 85°F in January, February, March, April, May, June, July, August, October, November and December. Of those, June has the fewest days with rain (11).
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 USC00519523.
How hot and how cold does it get in Waimanalo?
In a normal year in Waimanalo, 1 day a year reaches 90°F, nights almost never fall to freezing and 169 days bring measurable precipitation.
- Days at 90°F or more
- 1a 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
- 169a normal year
The highest temperature in this station's record (since 1907) is 96°F, on July 30, 1907; the lowest is 52°F, on January 25, 1915.
The wettest calendar year on that record is 1982, with 68.96 in.
Source: NOAA NCEI 1991-2020 annual normals, station USC00519523; records: ACIS (NOAA Regional Climate Centers), station USC00519523. Records use complete months only; a month missing more than three days is left out.
How sunny is Waimanalo?
Over a year 85% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Waimanalo, 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 Waimanalo need?
A normal year in Waimanalo brings 1 heating degree days, 100% fewer than the median U.S. place (5,373), and 3,962 cooling degree days, 4.4 times the median (908). No month reaches 300 heating degree days. For gardens and crops, NOAA counts 9,437 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 0 | 202 |
| February | 0 | 188 |
| March | 0 | 236 |
| April | 0 | 282 |
| May | 0 | 333 |
| June | 0 | 390 |
| July | 0 | 436 |
| August | 0 | 454 |
| September | 0 | 435 |
| October | 0 | 414 |
| November | 0 | 332 |
| December | 0 | 262 |
| Year (annual) | 1 | 3,962 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00519523. 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.
Has Waimanalo been warmer than normal lately?
Over 31 complete years from 1970 to 2016, the station's annual mean temperature rose at a fitted -0.1°F per century (−0.01°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Waimanalo's climate compare?
Waimanalo is warmer than 11 of the other 17 places with their own NOAA record in Hawaii, and wetter than 10. Across the 7,247 U.S. stations with normals, its annual mean of 75.8°F is warmer than 99%.
In the Köppen classification computed from these normals, Waimanalo is Aw: tropical savanna. 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 Waimanalo share this climate record?
3 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.
- East Honolulu, HIalso near: Manoa Lyon Arbo 785.2 (6 mi, 72.4°F a year); Waikiki 717.2 (6 mi, 77.6°F a year)50,961 people · 3 mi S
- Kailua, HI39,762 people · 5 mi N
- Waimanalo Beach, HI4,587 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 Waimanalo's climate
What is the coldest month in Waimanalo?
January, with a normal high of 78°F and a normal low of 65°F. The warmest is August (85°F by day, 74°F at night).
Does it snow in Waimanalo?
Rarely: NOAA's normal is no measurable snow a year.
What is the rainiest month in Waimanalo?
December, with 5.45 in of precipitation in a normal year; the driest is June with 1.26 in.
What plant hardiness zone is Waimanalo in?
The USDA's 2023 map puts Waimanalo in zone 12b in ZIP code 96795. By the same method at Waimanalo's NOAA station, the coldest night of a typical year reaches 56°F (19 years, 1991-2020): zone 12b.
Nearby and next
- Hawaii climateThe statewide normals and every place in the state
- Manoa Lyon Arbo 785.2, HI6 miles from this station, 72.4°F a year
- Waikiki 717.2, HI8 miles from this station, 77.6°F a year
- Kaneohe, HI9 miles from this station, 76.6°F a year
- Waihee 837.5, HI12 miles from this station, 74.3°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made