Diamond Head / Kapahulu / Saint Louis Heights weather in September
In September, Diamond Head / Kapahulu / Saint Louis Heights sees average daytime highs of 79°F and overnight lows near 77°F, with 0.4 in of rain across 2.2 wet days and about 12.1 hours of daylight. It is the 1st-warmest and 9th-wettest month of the year here.
Day-to-day highs hold fairly steady near 79°F through the month. The sky is clear or mostly clear about 74% of the time in September, and the air most often feels oppressive.
Daylight stretches from about 12 h 24 min at the start of September to 11 h 48 min by month's end. Set against the rest of the year, September is Diamond Head / Kapahulu / Saint Louis Heights's 3rd-clearest and 6th-windiest month. For the whole year in context, see Diamond Head / Kapahulu / Saint Louis Heights's year-round climate.
- Daytime high
- 79°
- 1st warmest
- Overnight low
- 77°
- 12th coldest
- Rainfall
- 0.4 in
- 2.2 wet days
- Daylight
- 12 h 06 min
- 6:22 AM – 6:29 PM
- Cloud cover
- 29%
- 3rd clearest
- Wind
- 16 mph
- 6th windiest
- Solar energy
- 6.48 kWh/m²
- Travel score
- 8.4
- out of 10
Temperature in September
Day-to-day highs hold fairly steady near 79°F through the month.
A typical September day in Diamond Head / Kapahulu / Saint Louis Heights reaches about 79°F in the afternoon and slips back to 77°F overnight — a 2°F spread between the day's warmth and the night's chill. On most days the high lands between 78°F and 81°F. Set against its neighbours, September runs on par with August and on par with October.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 79 | 79 | 79 | 79 | 79 | 79 | 79 | 79 | 79 | 79 | 79 | 79 | 79 | 79 | 79 | 79 | 79 | 79 | 79 | 79 | 79 | 79 | 79 | 79 | 79 | 79 | 79 | 79 | 79 | 79 |
| Avg low (°F) | 77 | 77 | 77 | 77 | 77 | 77 | 77 | 77 | 77 | 77 | 77 | 77 | 77 | 77 | 77 | 77 | 77 | 77 | 77 | 77 | 77 | 77 | 77 | 77 | 77 | 77 | 77 | 77 | 77 | 77 |
| Avg high (°F) | Avg low (°F) | |
|---|---|---|
| 1 | 79 | 77 |
| 2 | 79 | 77 |
| 3 | 79 | 77 |
| 4 | 79 | 77 |
| 5 | 79 | 77 |
| 6 | 79 | 77 |
| 7 | 79 | 77 |
| 8 | 79 | 77 |
| 9 | 79 | 77 |
| 10 | 79 | 77 |
| 11 | 79 | 77 |
| 12 | 79 | 77 |
| 13 | 79 | 77 |
| 14 | 79 | 77 |
| 15 | 79 | 77 |
| 16 | 79 | 77 |
| 17 | 79 | 77 |
| 18 | 79 | 77 |
| 19 | 79 | 77 |
| 20 | 79 | 77 |
| 21 | 79 | 77 |
| 22 | 79 | 77 |
| 23 | 79 | 77 |
| 24 | 79 | 77 |
| 25 | 79 | 77 |
| 26 | 79 | 77 |
| 27 | 79 | 77 |
| 28 | 79 | 77 |
| 29 | 79 | 77 |
| 30 | 79 | 77 |
Diamond Head / Kapahulu / Saint Louis Heights weather by month
How September compares with the rest of the year at a glance. September is the 1st-warmest and 9th-wettest month here — the current month is highlighted below.
| Month | High / Low (°F) | Rainfall (inches) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 74° / 72° | 1.4 | 4.9 | 10.8 | 8.2 |
| Feb | 74° / 71° | 1.1 | 4.4 | 11.3 | 8.1 |
| Mar | 74° / 71° | 1.5 | 4.4 | 11.8 | 8.2 |
| Apr | 75° / 72° | 0.4 | 2.4 | 12.5 | 8.6 |
| May | 76° / 74° | 0.5 | 2.2 | 13 | 8.7 |
| Jun | 77° / 75° | 0.3 | 1.1 | 13.3 | 8.8 |
| Jul | 78° / 76° | 0.2 | 1 | 13.2 | 8.7 |
| Aug | 79° / 77° | 0.4 | 1.8 | 12.7 | 8.5 |
| Sep | 79° / 77° | 0.4 | 2.2 | 12.1 | 8.4 |
| Oct | 79° / 76° | 0.8 | 2.9 | 11.5 | 8.1 |
| Nov | 77° / 75° | 1.6 | 4.9 | 11 | 8.0 |
| Dec | 75° / 73° | 1.9 | 5.2 | 10.7 | 8.2 |
Cloud cover in September
The sky is clear or mostly clear about 74% of the time in September.
Beyond those clear spells, partly cloudy skies cover about 11% of September, with mostly cloudy or overcast conditions the remaining 15%. Skies tend to cloud over as the month goes on.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 86 | 87 | 87 | 87 | 87 | 87 | 87 | 87 | 87 | 87 | 87 | 87 | 87 | 87 | 87 | 87 | 86 | 86 | 86 | 86 | 85 | 85 | 84 | 83 | 83 | 82 | 82 | 80 | 80 | 79 |
| Cloudier (%) | 14 | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 14 | 14 | 14 | 14 | 15 | 15 | 16 | 17 | 17 | 18 | 18 | 20 | 20 | 21 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 86 | 14 |
| 2 | 87 | 13 |
| 3 | 87 | 13 |
| 4 | 87 | 13 |
| 5 | 87 | 13 |
| 6 | 87 | 13 |
| 7 | 87 | 13 |
| 8 | 87 | 13 |
| 9 | 87 | 13 |
| 10 | 87 | 13 |
| 11 | 87 | 13 |
| 12 | 87 | 13 |
| 13 | 87 | 13 |
| 14 | 87 | 13 |
| 15 | 87 | 13 |
| 16 | 87 | 13 |
| 17 | 86 | 14 |
| 18 | 86 | 14 |
| 19 | 86 | 14 |
| 20 | 86 | 14 |
| 21 | 85 | 15 |
| 22 | 85 | 15 |
| 23 | 84 | 16 |
| 24 | 83 | 17 |
| 25 | 83 | 17 |
| 26 | 82 | 18 |
| 27 | 82 | 18 |
| 28 | 80 | 20 |
| 29 | 80 | 20 |
| 30 | 79 | 21 |
Chance of precipitation in September
Diamond Head / Kapahulu / Saint Louis Heights gets around 0.4 in of rain over 2.2 wet days in September. The line is the day-by-day chance of measurable precipitation.
Day to day, the chance of measurable rain averages around 8% and peaks near 8% on the wettest days.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain chance (%) | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 7 | 7 | 7 | 7 | 7 | 7 | 7 |
| Rain chance (%) | |
|---|---|
| 1 | 7 |
| 2 | 7 |
| 3 | 7 |
| 4 | 7 |
| 5 | 7 |
| 6 | 7 |
| 7 | 7 |
| 8 | 7 |
| 9 | 8 |
| 10 | 8 |
| 11 | 8 |
| 12 | 8 |
| 13 | 8 |
| 14 | 8 |
| 15 | 8 |
| 16 | 8 |
| 17 | 8 |
| 18 | 8 |
| 19 | 8 |
| 20 | 8 |
| 21 | 8 |
| 22 | 8 |
| 23 | 8 |
| 24 | 7 |
| 25 | 7 |
| 26 | 7 |
| 27 | 7 |
| 28 | 7 |
| 29 | 7 |
| 30 | 7 |
Humidity in September
Most of September feels oppressive — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, September lands in the oppressive band about 53% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Humid (%) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| Muggy (%) | 47 | 47 | 47 | 46 | 46 | 46 | 45 | 45 | 45 | 44 | 44 | 44 | 44 | 44 | 44 | 45 | 45 | 45 | 45 | 46 | 46 | 46 | 47 | 47 | 47 | 48 | 48 | 48 | 48 | 48 |
| Oppressive (%) | 52 | 52 | 52 | 53 | 53 | 53 | 54 | 54 | 54 | 55 | 55 | 55 | 55 | 55 | 55 | 54 | 54 | 54 | 54 | 53 | 53 | 53 | 52 | 52 | 52 | 51 | 51 | 51 | 51 | 51 |
| Miserable (%) | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Humid (%) | Muggy (%) | Oppressive (%) | Miserable (%) | |
|---|---|---|---|---|
| 1 | 0 | 47 | 52 | 1 |
| 2 | 0 | 47 | 52 | 1 |
| 3 | 0 | 47 | 52 | 1 |
| 4 | 0 | 46 | 53 | 1 |
| 5 | 0 | 46 | 53 | 1 |
| 6 | 0 | 46 | 53 | 1 |
| 7 | 0 | 45 | 54 | 1 |
| 8 | 0 | 45 | 54 | 1 |
| 9 | 0 | 45 | 54 | 1 |
| 10 | 0 | 44 | 55 | 1 |
| 11 | 0 | 44 | 55 | 1 |
| 12 | 0 | 44 | 55 | 1 |
| 13 | 0 | 44 | 55 | 1 |
| 14 | 0 | 44 | 55 | 1 |
| 15 | 0 | 44 | 55 | 1 |
| 16 | 0 | 45 | 54 | 1 |
| 17 | 0 | 45 | 54 | 1 |
| 18 | 0 | 45 | 54 | 1 |
| 19 | 1 | 45 | 54 | 0 |
| 20 | 1 | 46 | 53 | 0 |
| 21 | 1 | 46 | 53 | 0 |
| 22 | 1 | 46 | 53 | 0 |
| 23 | 1 | 47 | 52 | 0 |
| 24 | 1 | 47 | 52 | 0 |
| 25 | 1 | 47 | 52 | 0 |
| 26 | 1 | 48 | 51 | 0 |
| 27 | 1 | 48 | 51 | 0 |
| 28 | 1 | 48 | 51 | 0 |
| 29 | 1 | 48 | 51 | 0 |
| 30 | 1 | 48 | 51 | 0 |
Wind in September
Winds average 16 mph in September.
Across September, daily wind ranges from about 15 mph on the calmest days to 17 mph at its breeziest. It stays fairly steady from day to day.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wind speed (mph) | 17 | 17 | 16 | 16 | 16 | 16 | 16 | 16 | 16 | 16 | 16 | 16 | 16 | 16 | 16 | 16 | 16 | 16 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 |
| Feels | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy |
| Wind speed (mph) | Feels | |
|---|---|---|
| 1 | 17 | breezy |
| 2 | 17 | breezy |
| 3 | 16 | breezy |
| 4 | 16 | breezy |
| 5 | 16 | breezy |
| 6 | 16 | breezy |
| 7 | 16 | breezy |
| 8 | 16 | breezy |
| 9 | 16 | breezy |
| 10 | 16 | breezy |
| 11 | 16 | breezy |
| 12 | 16 | breezy |
| 13 | 16 | breezy |
| 14 | 16 | breezy |
| 15 | 16 | breezy |
| 16 | 16 | breezy |
| 17 | 16 | breezy |
| 18 | 16 | breezy |
| 19 | 15 | breezy |
| 20 | 15 | breezy |
| 21 | 15 | breezy |
| 22 | 15 | breezy |
| 23 | 15 | breezy |
| 24 | 15 | breezy |
| 25 | 15 | breezy |
| 26 | 15 | breezy |
| 27 | 15 | breezy |
| 28 | 15 | breezy |
| 29 | 15 | breezy |
| 30 | 15 | breezy |
Sunrise & sunset in September
Daylight runs from about 12 h 24 min at the start of September to 11 h 48 min by month's end. The lit band spans sunrise to sunset each day.
Days shrink by about 36 minutes over September. Sunrise moves from 6:18 AM to 6:26 AM, and sunset from 6:44 PM to 6:15 PM.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 12.4 | 12.4 | 12.4 | 12.4 | 12.3 | 12.3 | 12.3 | 12.3 | 12.3 | 12.2 | 12.2 | 12.2 | 12.2 | 12.2 | 12.1 | 12.1 | 12.1 | 12.1 | 12.1 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 11.9 | 11.9 | 11.9 | 11.9 | 11.8 | 11.8 |
| Sunrise (AM) | 6:18 | 6:18 | 6:19 | 6:19 | 6:19 | 6:19 | 6:20 | 6:20 | 6:20 | 6:20 | 6:21 | 6:21 | 6:21 | 6:21 | 6:22 | 6:22 | 6:22 | 6:22 | 6:23 | 6:23 | 6:23 | 6:24 | 6:24 | 6:24 | 6:24 | 6:25 | 6:25 | 6:25 | 6:25 | 6:26 |
| Sunset (PM) | 6:44 | 6:43 | 6:42 | 6:41 | 6:40 | 6:39 | 6:38 | 6:37 | 6:36 | 6:35 | 6:34 | 6:33 | 6:32 | 6:31 | 6:30 | 6:29 | 6:28 | 6:27 | 6:26 | 6:25 | 6:24 | 6:23 | 6:22 | 6:21 | 6:20 | 6:19 | 6:18 | 6:17 | 6:16 | 6:15 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 12.4 | 6:18 | 6:44 |
| 2 | 12.4 | 6:18 | 6:43 |
| 3 | 12.4 | 6:19 | 6:42 |
| 4 | 12.4 | 6:19 | 6:41 |
| 5 | 12.3 | 6:19 | 6:40 |
| 6 | 12.3 | 6:19 | 6:39 |
| 7 | 12.3 | 6:20 | 6:38 |
| 8 | 12.3 | 6:20 | 6:37 |
| 9 | 12.3 | 6:20 | 6:36 |
| 10 | 12.2 | 6:20 | 6:35 |
| 11 | 12.2 | 6:21 | 6:34 |
| 12 | 12.2 | 6:21 | 6:33 |
| 13 | 12.2 | 6:21 | 6:32 |
| 14 | 12.2 | 6:21 | 6:31 |
| 15 | 12.1 | 6:22 | 6:30 |
| 16 | 12.1 | 6:22 | 6:29 |
| 17 | 12.1 | 6:22 | 6:28 |
| 18 | 12.1 | 6:22 | 6:27 |
| 19 | 12.1 | 6:23 | 6:26 |
| 20 | 12.0 | 6:23 | 6:25 |
| 21 | 12.0 | 6:23 | 6:24 |
| 22 | 12.0 | 6:24 | 6:23 |
| 23 | 12.0 | 6:24 | 6:22 |
| 24 | 12.0 | 6:24 | 6:21 |
| 25 | 11.9 | 6:24 | 6:20 |
| 26 | 11.9 | 6:25 | 6:19 |
| 27 | 11.9 | 6:25 | 6:18 |
| 28 | 11.9 | 6:25 | 6:17 |
| 29 | 11.8 | 6:25 | 6:16 |
| 30 | 11.8 | 6:26 | 6:15 |
Solar energy in September
Average shortwave solar energy reaching the ground each day in September, about 6.48 kWh/m².
For context, solar energy here swings from a low near 4.29 kWh/m² to a high of 7.28 kWh/m² in June across the year — September's 6.48 kWh/m² falls in the middle.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 6.8 | 6.8 | 6.7 | 6.7 | 6.7 | 6.7 | 6.7 | 6.7 | 6.6 | 6.6 | 6.6 | 6.6 | 6.5 | 6.5 | 6.5 | 6.5 | 6.5 | 6.4 | 6.4 | 6.4 | 6.3 | 6.3 | 6.3 | 6.3 | 6.2 | 6.2 | 6.2 | 6.1 | 6.1 | 6.1 |
| Level | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| 1 | 6.8 | Intense |
| 2 | 6.8 | Intense |
| 3 | 6.7 | Intense |
| 4 | 6.7 | Intense |
| 5 | 6.7 | Intense |
| 6 | 6.7 | Intense |
| 7 | 6.7 | Intense |
| 8 | 6.7 | Intense |
| 9 | 6.6 | Intense |
| 10 | 6.6 | Intense |
| 11 | 6.6 | Intense |
| 12 | 6.6 | Intense |
| 13 | 6.5 | Intense |
| 14 | 6.5 | Intense |
| 15 | 6.5 | Intense |
| 16 | 6.5 | Intense |
| 17 | 6.5 | Intense |
| 18 | 6.4 | Intense |
| 19 | 6.4 | Intense |
| 20 | 6.4 | Intense |
| 21 | 6.3 | Intense |
| 22 | 6.3 | Intense |
| 23 | 6.3 | Intense |
| 24 | 6.3 | Intense |
| 25 | 6.2 | Intense |
| 26 | 6.2 | Intense |
| 27 | 6.2 | Intense |
| 28 | 6.1 | Intense |
| 29 | 6.1 | Intense |
| 30 | 6.1 | Intense |
Hazard calendar for Diamond Head / Kapahulu / Saint Louis Heights
In September, Diamond Head / Kapahulu / Saint Louis Heights sits inside its pacific hurricane season. The full year is below, with each hazard's peak months called out.
Diamond Head / Kapahulu / Saint Louis Heights sits in the eastern Pacific hurricane zone; the season peaks August–September.
Is September a good time to visit Diamond Head / Kapahulu / Saint Louis Heights?
Our two travel scores rate September for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).
September is one of the better times to visit Diamond Head / Kapahulu / Saint Louis Heights for general sightseeing. The water and warmth also suit a beach or pool day.
What to pack for Diamond Head / Kapahulu / Saint Louis Heights in September
From September's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In September, Diamond Head / Kapahulu / Saint Louis Heights sees daytime highs around 79°F and nights near 77°F. Pack sun protection. Worth having: light clothes and a windbreaker.
Sea temperature near Diamond Head / Kapahulu / Saint Louis Heights in September
The nearest coast averages about 80°F in September — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea at the nearest coast (about 8 mi away) is warmest in September at about 80°F and coldest in February near 75°F.
The water stays above 68°F all year — warm enough for a swim any month.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°F) | 76 | 75 | 75 | 76 | 77 | 78 | 79 | 80 | 80 | 80 | 79 | 77 |
| Comfort | Warm | Warm | Warm | Warm | Warm | Warm | Warm | Warm | Warm | Warm | Warm | Warm |
| Sea temperature (°F) | Comfort | |
|---|---|---|
| Jan | 76 | Warm |
| Feb | 75 | Warm |
| Mar | 75 | Warm |
| Apr | 76 | Warm |
| May | 77 | Warm |
| Jun | 78 | Warm |
| Jul | 79 | Warm |
| Aug | 80 | Warm |
| Sep | 80 | Warm |
| Oct | 80 | Warm |
| Nov | 79 | Warm |
| Dec | 77 | Warm |
UV index in Diamond Head / Kapahulu / Saint Louis Heights in September
Clear-sky midday UV in September peaks around 12 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Diamond Head / Kapahulu / Saint Louis Heights peaks around July 21 at about 12 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 18 at about 6 (high).
The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 7 | 9 | 10 | 11 | 10 | 11 | 12 | 12 | 12 | 9 | 7 | 6 |
| Level | High | Very high | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Very high | High | High |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 7 | High |
| Feb | 9 | Very high |
| Mar | 10 | Extreme |
| Apr | 11 | Extreme |
| May | 10 | Extreme |
| Jun | 11 | Extreme |
| Jul | 12 | Extreme |
| Aug | 12 | Extreme |
| Sep | 12 | Extreme |
| Oct | 9 | Very high |
| Nov | 7 | High |
| Dec | 6 | High |
Where is Diamond Head / Kapahulu / Saint Louis Heights?
Diamond Head / Kapahulu / Saint Louis Heights sits at 21.3°N, 157.8°W, 46 ft above sea level, in United States. The nearest listed city is Kaimukī, 0.6 mi away.
Topography around Diamond Head / Kapahulu / Saint Louis Heights
How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Diamond Head / Kapahulu / Saint Louis Heights.
Within 2 miles, the terrain around Diamond Head / Kapahulu / Saint Louis Heights has significant variations in elevation — a maximum elevation change of 971 ft around an average of 108 ft above sea level; within 10 miles, large variations in elevation — a maximum elevation change of 3,117 ft; within 50 miles, very significant variations in elevation — a maximum elevation change of 3,983 ft.
The land around Diamond Head / Kapahulu / Saint Louis Heights is covered by artificial surfaces (50%) and water (24%) within 2 miles, water (57%) and trees (23%) within 10 miles, and water (86%) within 50 miles.
United States travel facts
- Power plugs
- Type A / B
- 120 V · 60 Hz
- Prices
- ≈ 100% of US
- price level, 2025
- GDP per capita
- $90,027
- 2025
- Happiness
- 6.8 / 10
- World Happiness, 2025
- Safe drinking water
- 98%
- of population, 2024
- Homicide rate
- 5.8
- per 100k, 2023
- Road deaths
- 12.7
- per 100k/yr, 2019
- Income group
- High
- World Bank
- Religion
Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.
Data sources
Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Diamond Head / Kapahulu / Saint Louis Heights (21.277°, -157.8113°, elevation 46 ft), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. Tropical-cyclone seasons are the published climatological basin seasons (NOAA National Hurricane Center / regional warning centres). Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).