Wailuku weather in May
In May, Wailuku sees average daytime highs of 81°F and overnight lows near 72°F, with 0.5 in of rain across 3.3 wet days and about 13 hours of daylight. It is the 6th-warmest and 9th-wettest month of the year here.
Day-to-day highs hold fairly steady near 81°F through the month. The sky is clear or mostly clear about 41% of the time in May, and the air most often feels humid.
Daylight stretches from about 12 h 48 min at the start of May to 13 h 12 min by month's end. Set against the rest of the year, May is Wailuku's 8th-clearest and 8th-windiest month. For the whole year in context, see Wailuku's year-round climate.
- Daytime high
- 81°
- 6th warmest
- Overnight low
- 72°
- 6th coldest
- Rainfall
- 0.5 in
- 3.3 wet days
- Daylight
- 13 hours
- 5:53 AM – 6:52 PM
- Cloud cover
- 47%
- 8th clearest
- Wind
- 10 mph
- 8th windiest
- Solar energy
- 6.75 kWh/m²
- Travel score
- 7.7
- out of 10
Wailuku is census-designated place in Maui County, Hawaiʻi, United States.
- Density
- 1,042/km²
- people per km²
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
Temperature in May
Day-to-day highs hold fairly steady near 81°F through the month.
A typical May day in Wailuku reaches about 81°F in the afternoon and slips back to 72°F overnight — a 9°F spread between the day's warmth and the night's chill. On most days the high lands between 78°F and 83°F. Set against its neighbours, May runs about 2°F warmer than April and about 2°F cooler than June.
| 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 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 80 | 80 | 80 | 80 | 80 | 80 | 80 | 80 | 80 | 80 | 80 | 80 | 80 | 80 | 81 | 81 | 81 | 81 | 81 | 81 | 81 | 81 | 81 | 81 | 82 | 82 | 82 | 82 | 82 | 82 | 82 |
| Avg low (°F) | 71 | 71 | 71 | 71 | 71 | 71 | 71 | 71 | 71 | 71 | 71 | 71 | 71 | 71 | 71 | 72 | 72 | 72 | 72 | 72 | 72 | 72 | 72 | 72 | 72 | 72 | 73 | 73 | 73 | 73 | 73 |
| Avg high (°F) | Avg low (°F) | |
|---|---|---|
| 1 | 80 | 71 |
| 2 | 80 | 71 |
| 3 | 80 | 71 |
| 4 | 80 | 71 |
| 5 | 80 | 71 |
| 6 | 80 | 71 |
| 7 | 80 | 71 |
| 8 | 80 | 71 |
| 9 | 80 | 71 |
| 10 | 80 | 71 |
| 11 | 80 | 71 |
| 12 | 80 | 71 |
| 13 | 80 | 71 |
| 14 | 80 | 71 |
| 15 | 81 | 71 |
| 16 | 81 | 72 |
| 17 | 81 | 72 |
| 18 | 81 | 72 |
| 19 | 81 | 72 |
| 20 | 81 | 72 |
| 21 | 81 | 72 |
| 22 | 81 | 72 |
| 23 | 81 | 72 |
| 24 | 81 | 72 |
| 25 | 82 | 72 |
| 26 | 82 | 72 |
| 27 | 82 | 73 |
| 28 | 82 | 73 |
| 29 | 82 | 73 |
| 30 | 82 | 73 |
| 31 | 82 | 73 |
Wailuku weather by month
How May compares with the rest of the year at a glance. May is the 6th-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 | 77° / 69° | 1.4 | 5.6 | 10.9 | 7.9 |
| Feb | 77° / 68° | 1.2 | 5.2 | 11.3 | 7.8 |
| Mar | 77° / 69° | 1.8 | 6.7 | 11.9 | 7.5 |
| Apr | 79° / 70° | 0.8 | 3.9 | 12.5 | 7.6 |
| May | 81° / 72° | 0.5 | 3.3 | 13 | 7.7 |
| Jun | 82° / 73° | 0.2 | 1.9 | 13.2 | 7.6 |
| Jul | 83° / 74° | 0.4 | 2.7 | 13.1 | 7.0 |
| Aug | 84° / 75° | 0.5 | 2.7 | 12.7 | 6.8 |
| Sep | 84° / 75° | 0.4 | 2.2 | 12.1 | 6.8 |
| Oct | 83° / 74° | 0.7 | 3.2 | 11.5 | 7.0 |
| Nov | 80° / 72° | 1.0 | 5 | 11 | 7.4 |
| Dec | 78° / 70° | 1.6 | 5.2 | 10.8 | 7.7 |
Cloud cover in May
The sky is clear or mostly clear about 41% of the time in May.
Beyond those clear spells, partly cloudy skies cover about 29% of May, with mostly cloudy or overcast conditions the remaining 31%. Skies tend to open up 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 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 67 | 67 | 67 | 67 | 67 | 66 | 66 | 65 | 65 | 65 | 65 | 66 | 65 | 66 | 66 | 68 | 68 | 69 | 70 | 70 | 72 | 72 | 73 | 74 | 74 | 75 | 76 | 76 | 76 | 76 | 76 |
| Cloudier (%) | 33 | 33 | 33 | 33 | 33 | 34 | 34 | 35 | 35 | 35 | 35 | 34 | 35 | 34 | 34 | 32 | 32 | 31 | 30 | 30 | 28 | 28 | 27 | 26 | 26 | 25 | 24 | 24 | 24 | 24 | 24 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 67 | 33 |
| 2 | 67 | 33 |
| 3 | 67 | 33 |
| 4 | 67 | 33 |
| 5 | 67 | 33 |
| 6 | 66 | 34 |
| 7 | 66 | 34 |
| 8 | 65 | 35 |
| 9 | 65 | 35 |
| 10 | 65 | 35 |
| 11 | 65 | 35 |
| 12 | 66 | 34 |
| 13 | 65 | 35 |
| 14 | 66 | 34 |
| 15 | 66 | 34 |
| 16 | 68 | 32 |
| 17 | 68 | 32 |
| 18 | 69 | 31 |
| 19 | 70 | 30 |
| 20 | 70 | 30 |
| 21 | 72 | 28 |
| 22 | 72 | 28 |
| 23 | 73 | 27 |
| 24 | 74 | 26 |
| 25 | 74 | 26 |
| 26 | 75 | 25 |
| 27 | 76 | 24 |
| 28 | 76 | 24 |
| 29 | 76 | 24 |
| 30 | 76 | 24 |
| 31 | 76 | 24 |
Chance of precipitation in May
Wailuku gets around 0.5 in of rain over 3.3 wet days in May. The line is the day-by-day chance of measurable precipitation.
Day to day, the chance of measurable rain averages around 10% and peaks near 13% on the wettest days. The odds ease toward the end of the month.
| 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 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain chance (%) | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 12 | 12 | 11 | 11 | 10 | 10 | 10 | 9 | 9 | 9 | 8 | 8 | 8 | 7 | 7 | 7 | 7 | 7 | 6 |
| Rain chance (%) | |
|---|---|
| 1 | 13 |
| 2 | 13 |
| 3 | 13 |
| 4 | 13 |
| 5 | 13 |
| 6 | 13 |
| 7 | 13 |
| 8 | 13 |
| 9 | 13 |
| 10 | 13 |
| 11 | 13 |
| 12 | 13 |
| 13 | 12 |
| 14 | 12 |
| 15 | 11 |
| 16 | 11 |
| 17 | 10 |
| 18 | 10 |
| 19 | 10 |
| 20 | 9 |
| 21 | 9 |
| 22 | 9 |
| 23 | 8 |
| 24 | 8 |
| 25 | 8 |
| 26 | 7 |
| 27 | 7 |
| 28 | 7 |
| 29 | 7 |
| 30 | 7 |
| 31 | 6 |
Humidity in May
Most of May feels humid — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, May lands in the humid band about 51% of days. Sticky, muggy-or-worse air turns up on roughly 44% 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 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Comfortable (%) | 9 | 9 | 9 | 9 | 8 | 8 | 8 | 8 | 8 | 7 | 7 | 6 | 6 | 5 | 5 | 5 | 4 | 4 | 4 | 3 | 3 | 3 | 2 | 2 | 2 | 1 | 1 | 1 | 1 | 1 | 1 |
| Humid (%) | 60 | 59 | 58 | 57 | 58 | 57 | 56 | 55 | 54 | 54 | 53 | 53 | 52 | 53 | 52 | 51 | 51 | 51 | 50 | 50 | 49 | 49 | 48 | 47 | 46 | 45 | 44 | 43 | 42 | 41 | 40 |
| Muggy (%) | 30 | 31 | 32 | 33 | 33 | 34 | 35 | 36 | 37 | 38 | 39 | 40 | 41 | 41 | 42 | 43 | 44 | 44 | 45 | 46 | 47 | 48 | 49 | 50 | 51 | 53 | 54 | 56 | 57 | 58 | 59 |
| Oppressive (%) | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 0 |
| Comfortable (%) | Humid (%) | Muggy (%) | Oppressive (%) | |
|---|---|---|---|---|
| 1 | 9 | 60 | 30 | 1 |
| 2 | 9 | 59 | 31 | 1 |
| 3 | 9 | 58 | 32 | 1 |
| 4 | 9 | 57 | 33 | 1 |
| 5 | 8 | 58 | 33 | 1 |
| 6 | 8 | 57 | 34 | 1 |
| 7 | 8 | 56 | 35 | 1 |
| 8 | 8 | 55 | 36 | 1 |
| 9 | 8 | 54 | 37 | 1 |
| 10 | 7 | 54 | 38 | 1 |
| 11 | 7 | 53 | 39 | 1 |
| 12 | 6 | 53 | 40 | 1 |
| 13 | 6 | 52 | 41 | 1 |
| 14 | 5 | 53 | 41 | 1 |
| 15 | 5 | 52 | 42 | 1 |
| 16 | 5 | 51 | 43 | 1 |
| 17 | 4 | 51 | 44 | 1 |
| 18 | 4 | 51 | 44 | 1 |
| 19 | 4 | 50 | 45 | 1 |
| 20 | 3 | 50 | 46 | 1 |
| 21 | 3 | 49 | 47 | 1 |
| 22 | 3 | 49 | 48 | 1 |
| 23 | 2 | 48 | 49 | 1 |
| 24 | 2 | 47 | 50 | 1 |
| 25 | 2 | 46 | 51 | 1 |
| 26 | 1 | 45 | 53 | 1 |
| 27 | 1 | 44 | 54 | 1 |
| 28 | 1 | 43 | 56 | 0 |
| 29 | 1 | 42 | 57 | 0 |
| 30 | 1 | 41 | 58 | 0 |
| 31 | 1 | 40 | 59 | 0 |
Wind in May
Winds average 10 mph in May.
Across May, daily wind ranges from about 10 mph on the calmest days to 10 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 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wind speed (mph) | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 |
| Feels | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze |
| Wind speed (mph) | Feels | |
|---|---|---|
| 1 | 10 | light breeze |
| 2 | 10 | light breeze |
| 3 | 10 | light breeze |
| 4 | 10 | light breeze |
| 5 | 10 | light breeze |
| 6 | 10 | light breeze |
| 7 | 10 | light breeze |
| 8 | 10 | light breeze |
| 9 | 10 | light breeze |
| 10 | 10 | light breeze |
| 11 | 10 | light breeze |
| 12 | 10 | light breeze |
| 13 | 10 | light breeze |
| 14 | 10 | light breeze |
| 15 | 10 | light breeze |
| 16 | 10 | light breeze |
| 17 | 10 | light breeze |
| 18 | 10 | light breeze |
| 19 | 10 | light breeze |
| 20 | 10 | light breeze |
| 21 | 10 | light breeze |
| 22 | 10 | light breeze |
| 23 | 10 | light breeze |
| 24 | 10 | light breeze |
| 25 | 10 | light breeze |
| 26 | 10 | light breeze |
| 27 | 10 | light breeze |
| 28 | 10 | light breeze |
| 29 | 10 | light breeze |
| 30 | 10 | light breeze |
| 31 | 10 | light breeze |
Sunrise & sunset in May
Daylight runs from about 12 h 48 min at the start of May to 13 h 12 min by month's end. The lit band spans sunrise to sunset each day.
Days grow by about 24 minutes over May. Sunrise moves from 6:01 AM to 5:48 AM, and sunset from 6:46 PM to 6:58 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 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 12.8 | 12.8 | 12.8 | 12.8 | 12.8 | 12.8 | 12.9 | 12.9 | 12.9 | 12.9 | 12.9 | 12.9 | 12.9 | 13.0 | 13.0 | 13.0 | 13.0 | 13.0 | 13.0 | 13.0 | 13.1 | 13.1 | 13.1 | 13.1 | 13.1 | 13.1 | 13.1 | 13.1 | 13.1 | 13.2 | 13.2 |
| Sunrise (AM) | 6:01 | 6:00 | 5:59 | 5:59 | 5:58 | 5:57 | 5:57 | 5:56 | 5:56 | 5:55 | 5:55 | 5:54 | 5:54 | 5:53 | 5:53 | 5:53 | 5:52 | 5:52 | 5:51 | 5:51 | 5:51 | 5:50 | 5:50 | 5:50 | 5:50 | 5:49 | 5:49 | 5:49 | 5:49 | 5:49 | 5:48 |
| Sunset (PM) | 6:46 | 6:46 | 6:47 | 6:47 | 6:47 | 6:48 | 6:48 | 6:49 | 6:49 | 6:49 | 6:50 | 6:50 | 6:51 | 6:51 | 6:52 | 6:52 | 6:52 | 6:53 | 6:53 | 6:54 | 6:54 | 6:55 | 6:55 | 6:55 | 6:56 | 6:56 | 6:57 | 6:57 | 6:58 | 6:58 | 6:58 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 12.8 | 6:01 | 6:46 |
| 2 | 12.8 | 6:00 | 6:46 |
| 3 | 12.8 | 5:59 | 6:47 |
| 4 | 12.8 | 5:59 | 6:47 |
| 5 | 12.8 | 5:58 | 6:47 |
| 6 | 12.8 | 5:57 | 6:48 |
| 7 | 12.9 | 5:57 | 6:48 |
| 8 | 12.9 | 5:56 | 6:49 |
| 9 | 12.9 | 5:56 | 6:49 |
| 10 | 12.9 | 5:55 | 6:49 |
| 11 | 12.9 | 5:55 | 6:50 |
| 12 | 12.9 | 5:54 | 6:50 |
| 13 | 12.9 | 5:54 | 6:51 |
| 14 | 13.0 | 5:53 | 6:51 |
| 15 | 13.0 | 5:53 | 6:52 |
| 16 | 13.0 | 5:53 | 6:52 |
| 17 | 13.0 | 5:52 | 6:52 |
| 18 | 13.0 | 5:52 | 6:53 |
| 19 | 13.0 | 5:51 | 6:53 |
| 20 | 13.0 | 5:51 | 6:54 |
| 21 | 13.1 | 5:51 | 6:54 |
| 22 | 13.1 | 5:50 | 6:55 |
| 23 | 13.1 | 5:50 | 6:55 |
| 24 | 13.1 | 5:50 | 6:55 |
| 25 | 13.1 | 5:50 | 6:56 |
| 26 | 13.1 | 5:49 | 6:56 |
| 27 | 13.1 | 5:49 | 6:57 |
| 28 | 13.1 | 5:49 | 6:57 |
| 29 | 13.1 | 5:49 | 6:58 |
| 30 | 13.2 | 5:49 | 6:58 |
| 31 | 13.2 | 5:48 | 6:58 |
Solar energy in May
Average shortwave solar energy reaching the ground each day in May, about 6.75 kWh/m².
For context, solar energy here swings from a low near 4.12 kWh/m² to a high of 6.81 kWh/m² in June across the year — May's 6.75 kWh/m² sits near the top of that range.
| 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 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 6.6 | 6.6 | 6.6 | 6.6 | 6.6 | 6.6 | 6.6 | 6.6 | 6.6 | 6.7 | 6.7 | 6.7 | 6.7 | 6.7 | 6.7 | 6.7 | 6.7 | 6.8 | 6.8 | 6.8 | 6.8 | 6.8 | 6.8 | 6.8 | 6.8 | 6.8 | 6.9 | 6.9 | 6.9 | 6.9 | 6.9 |
| 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 | Intense |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| 1 | 6.6 | Intense |
| 2 | 6.6 | Intense |
| 3 | 6.6 | Intense |
| 4 | 6.6 | Intense |
| 5 | 6.6 | Intense |
| 6 | 6.6 | Intense |
| 7 | 6.6 | Intense |
| 8 | 6.6 | Intense |
| 9 | 6.6 | Intense |
| 10 | 6.7 | Intense |
| 11 | 6.7 | Intense |
| 12 | 6.7 | Intense |
| 13 | 6.7 | Intense |
| 14 | 6.7 | Intense |
| 15 | 6.7 | Intense |
| 16 | 6.7 | Intense |
| 17 | 6.7 | Intense |
| 18 | 6.8 | Intense |
| 19 | 6.8 | Intense |
| 20 | 6.8 | Intense |
| 21 | 6.8 | Intense |
| 22 | 6.8 | Intense |
| 23 | 6.8 | Intense |
| 24 | 6.8 | Intense |
| 25 | 6.8 | Intense |
| 26 | 6.8 | Intense |
| 27 | 6.9 | Intense |
| 28 | 6.9 | Intense |
| 29 | 6.9 | Intense |
| 30 | 6.9 | Intense |
| 31 | 6.9 | Intense |
Hazard calendar for Wailuku
In May, Wailuku sits inside its pacific hurricane season. The full year is below, with each hazard's peak months called out.
Wailuku sits in the eastern Pacific hurricane zone; the season peaks August–September.
Is May a good time to visit Wailuku?
Our two travel scores rate May for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).
May is one of the better times to visit Wailuku for general sightseeing. The water and warmth also suit a beach or pool day.
What to pack for Wailuku in May
From May's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In May, Wailuku sees daytime highs around 81°F and nights near 72°F. Pack light clothes and sun protection. About 3 days see rain.
Sea temperature near Wailuku in May
The nearest coast averages about 77°F in May — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea offshore 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 Wailuku in May
Clear-sky midday UV in May peaks around 10 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Wailuku peaks around July 22 at about 12 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 17 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 | 11 | 13 | 10 | 11 | 12 | 12 | 12 | 10 | 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 | 11 | Extreme |
| Apr | 13 | Extreme |
| May | 10 | Extreme |
| Jun | 11 | Extreme |
| Jul | 12 | Extreme |
| Aug | 12 | Extreme |
| Sep | 12 | Extreme |
| Oct | 10 | Very high |
| Nov | 7 | High |
| Dec | 6 | High |
Where is Wailuku?
Wailuku sits at 20.9°N, 156.5°W, 249 ft above sea level, in United States. The nearest listed city is Kahului, 1.9 mi away.
Topography around Wailuku
How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Wailuku.
Within 2 miles, the terrain around Wailuku has large variations in elevation — a maximum elevation change of 2,749 ft around an average of 522 ft above sea level; within 10 miles, very significant variations in elevation — a maximum elevation change of 5,751 ft; within 50 miles, extreme variations in elevation — a maximum elevation change of 9,977 ft.
The land around Wailuku is covered by trees (45%), artificial surfaces (30%) and grassland (20%) within 2 miles, grassland (38%), water (34%) and trees (21%) within 10 miles, and water (82%) 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 Wailuku (20.8913°, -156.506°, elevation 249 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).