Boulder City weather in May
In May, Boulder City sees average daytime highs of 89°F and overnight lows near 66°F, with 0.1 in of rain across 1.1 wet days and about 13.9 hours of daylight. It is the 5th-warmest and 11th-wettest month of the year here.
Highs climb over the month, from about 85°F in the first days to 93°F by the end. The sky is clear or mostly clear about 68% of the time in May, and the air most often feels dry.
Daylight stretches from about 13 h 24 min at the start of May to 14 h 12 min by month's end. Set against the rest of the year, May is Boulder City's 6th-clearest and 2nd-windiest month. For the whole year in context, see Boulder City's year-round climate.
- Daytime high
- 89°
- 5th warmest
- Overnight low
- 66°
- 8th coldest
- Rainfall
- 0.1 in
- 1.1 wet days
- Daylight
- 13 h 54 min
- 4:39 AM – 6:33 PM
- Cloud cover
- 29%
- 6th clearest
- Wind
- 6 mph
- 2nd windiest
- Solar energy
- 8.07 kWh/m²
- Travel score
- 5.5
- out of 10
Boulder City is city in Clark County, Nevada, United States.
- Density
- 29/km²
- people per km²
- Founded
- 1931
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
Temperature in May
Highs climb over the month, from about 85°F in the first days to 93°F by the end.
A typical May day in Boulder City reaches about 89°F in the afternoon and slips back to 66°F overnight — a 23°F spread between the day's warmth and the night's chill. On most days the high lands between 77°F and 99°F. Set against its neighbours, May runs about 10°F warmer than April and about 10°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) | 84 | 85 | 85 | 85 | 85 | 86 | 86 | 86 | 87 | 87 | 87 | 87 | 88 | 88 | 88 | 88 | 89 | 89 | 89 | 89 | 90 | 90 | 91 | 91 | 91 | 92 | 92 | 92 | 93 | 93 | 94 |
| Avg low (°F) | 62 | 62 | 62 | 63 | 63 | 63 | 64 | 64 | 64 | 65 | 65 | 65 | 65 | 66 | 66 | 66 | 66 | 67 | 67 | 67 | 67 | 68 | 68 | 68 | 69 | 69 | 69 | 70 | 70 | 70 | 71 |
| Avg high (°F) | Avg low (°F) | |
|---|---|---|
| 1 | 84 | 62 |
| 2 | 85 | 62 |
| 3 | 85 | 62 |
| 4 | 85 | 63 |
| 5 | 85 | 63 |
| 6 | 86 | 63 |
| 7 | 86 | 64 |
| 8 | 86 | 64 |
| 9 | 87 | 64 |
| 10 | 87 | 65 |
| 11 | 87 | 65 |
| 12 | 87 | 65 |
| 13 | 88 | 65 |
| 14 | 88 | 66 |
| 15 | 88 | 66 |
| 16 | 88 | 66 |
| 17 | 89 | 66 |
| 18 | 89 | 67 |
| 19 | 89 | 67 |
| 20 | 89 | 67 |
| 21 | 90 | 67 |
| 22 | 90 | 68 |
| 23 | 91 | 68 |
| 24 | 91 | 68 |
| 25 | 91 | 69 |
| 26 | 92 | 69 |
| 27 | 92 | 69 |
| 28 | 92 | 70 |
| 29 | 93 | 70 |
| 30 | 93 | 70 |
| 31 | 94 | 71 |
How May really feels in Boulder City
Once humidity and wind are folded in, May averages 11 days that feel above 90°F and 0 that feel at or below 32°F — the comfort signal a plain temperature reading hides.
The story in May is heat — humidity pushes the afternoon "feels like" well above the raw temperature.
Boulder City weather by month
How May compares with the rest of the year at a glance. May is the 5th-warmest and 11th-wettest month here — the current month is highlighted below.
| Month | High / Low (°F) | Rainfall (inches) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 58° / 41° | 0.9 | 3.6 | 9.8 | 5.1 |
| Feb | 63° / 45° | 1.2 | 4.4 | 10.6 | 6.5 |
| Mar | 71° / 51° | 0.7 | 3.2 | 11.7 | 8.0 |
| Apr | 79° / 57° | 0.3 | 1.6 | 12.9 | 8.3 |
| May | 89° / 66° | 0.1 | 1.1 | 13.9 | 5.5 |
| Jun | 99° / 75° | 0.1 | 0.5 | 14.4 | 1.8 |
| Jul | 104° / 82° | 0.3 | 2.5 | 14.2 | 0.0 |
| Aug | 102° / 81° | 0.4 | 3 | 13.4 | 0.6 |
| Sep | 95° / 73° | 0.3 | 1.8 | 12.2 | 3.4 |
| Oct | 81° / 61° | 0.4 | 1.8 | 11.1 | 7.8 |
| Nov | 67° / 49° | 0.5 | 1.7 | 10.1 | 7.8 |
| Dec | 56° / 41° | 0.8 | 3 | 9.6 | 4.8 |
Cloud cover in May
The sky is clear or mostly clear about 68% of the time in May.
Beyond those clear spells, partly cloudy skies cover about 15% of May, with mostly cloudy or overcast conditions the remaining 17%. 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 (%) | 83 | 83 | 83 | 83 | 82 | 82 | 81 | 81 | 82 | 82 | 81 | 81 | 81 | 81 | 81 | 81 | 81 | 82 | 82 | 83 | 83 | 83 | 84 | 84 | 85 | 85 | 84 | 86 | 86 | 86 | 87 |
| Cloudier (%) | 17 | 17 | 17 | 17 | 18 | 18 | 19 | 19 | 18 | 18 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 18 | 18 | 17 | 17 | 17 | 16 | 16 | 15 | 15 | 16 | 14 | 14 | 14 | 13 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 83 | 17 |
| 2 | 83 | 17 |
| 3 | 83 | 17 |
| 4 | 83 | 17 |
| 5 | 82 | 18 |
| 6 | 82 | 18 |
| 7 | 81 | 19 |
| 8 | 81 | 19 |
| 9 | 82 | 18 |
| 10 | 82 | 18 |
| 11 | 81 | 19 |
| 12 | 81 | 19 |
| 13 | 81 | 19 |
| 14 | 81 | 19 |
| 15 | 81 | 19 |
| 16 | 81 | 19 |
| 17 | 81 | 19 |
| 18 | 82 | 18 |
| 19 | 82 | 18 |
| 20 | 83 | 17 |
| 21 | 83 | 17 |
| 22 | 83 | 17 |
| 23 | 84 | 16 |
| 24 | 84 | 16 |
| 25 | 85 | 15 |
| 26 | 85 | 15 |
| 27 | 84 | 16 |
| 28 | 86 | 14 |
| 29 | 86 | 14 |
| 30 | 86 | 14 |
| 31 | 87 | 13 |
Chance of precipitation in May
Boulder City gets around 0.1 in of rain over 1.1 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 3% and peaks near 4% 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 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain chance (%) | 3 | 3 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 |
| Rain chance (%) | |
|---|---|
| 1 | 3 |
| 2 | 3 |
| 3 | 4 |
| 4 | 4 |
| 5 | 4 |
| 6 | 4 |
| 7 | 4 |
| 8 | 4 |
| 9 | 4 |
| 10 | 4 |
| 11 | 4 |
| 12 | 4 |
| 13 | 4 |
| 14 | 4 |
| 15 | 4 |
| 16 | 4 |
| 17 | 4 |
| 18 | 3 |
| 19 | 3 |
| 20 | 3 |
| 21 | 3 |
| 22 | 3 |
| 23 | 3 |
| 24 | 3 |
| 25 | 3 |
| 26 | 3 |
| 27 | 3 |
| 28 | 3 |
| 29 | 3 |
| 30 | 3 |
| 31 | 3 |
Humidity in May
Most of May feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, May lands in the dry band about 100% of days. It rarely turns muggy — the humid and sticky bands barely register.
| 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dry (%) | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 |
| Dry (%) | |
|---|---|
| 1 | 100 |
| 2 | 100 |
| 3 | 100 |
| 4 | 100 |
| 5 | 100 |
| 6 | 100 |
| 7 | 100 |
| 8 | 100 |
| 9 | 100 |
| 10 | 100 |
| 11 | 100 |
| 12 | 100 |
| 13 | 100 |
| 14 | 100 |
| 15 | 100 |
| 16 | 100 |
| 17 | 100 |
| 18 | 100 |
| 19 | 100 |
| 20 | 100 |
| 21 | 100 |
| 22 | 100 |
| 23 | 100 |
| 24 | 100 |
| 25 | 100 |
| 26 | 100 |
| 27 | 100 |
| 28 | 100 |
| 29 | 100 |
| 30 | 100 |
| 31 | 100 |
Wind in May
Winds average 6 mph in May.
Across May, daily wind ranges from about 6 mph on the calmest days to 6 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) | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 |
| Feels | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm |
| Wind speed (mph) | Feels | |
|---|---|---|
| 1 | 6 | calm |
| 2 | 6 | calm |
| 3 | 6 | calm |
| 4 | 6 | calm |
| 5 | 6 | calm |
| 6 | 6 | calm |
| 7 | 6 | calm |
| 8 | 6 | calm |
| 9 | 6 | calm |
| 10 | 6 | calm |
| 11 | 6 | calm |
| 12 | 6 | calm |
| 13 | 6 | calm |
| 14 | 6 | calm |
| 15 | 6 | calm |
| 16 | 6 | calm |
| 17 | 6 | calm |
| 18 | 6 | calm |
| 19 | 6 | calm |
| 20 | 6 | calm |
| 21 | 6 | calm |
| 22 | 6 | calm |
| 23 | 6 | calm |
| 24 | 6 | calm |
| 25 | 6 | calm |
| 26 | 6 | calm |
| 27 | 6 | calm |
| 28 | 6 | calm |
| 29 | 6 | calm |
| 30 | 6 | calm |
| 31 | 6 | calm |
Sunrise & sunset in May
Daylight runs from about 13 h 24 min at the start of May to 14 h 12 min by month's end. The lit band spans sunrise to sunset each day.
Days grow by about 48 minutes over May. Sunrise moves from 4:53 AM to 4:30 AM, and sunset from 6:20 PM to 6:44 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) | 13.4 | 13.5 | 13.5 | 13.5 | 13.6 | 13.6 | 13.6 | 13.7 | 13.7 | 13.7 | 13.8 | 13.8 | 13.8 | 13.8 | 13.9 | 13.9 | 13.9 | 14.0 | 14.0 | 14.0 | 14.0 | 14.1 | 14.1 | 14.1 | 14.1 | 14.1 | 14.2 | 14.2 | 14.2 | 14.2 | 14.2 |
| Sunrise (AM) | 4:53 | 4:52 | 4:51 | 4:50 | 4:49 | 4:48 | 4:47 | 4:46 | 4:45 | 4:44 | 4:43 | 4:42 | 4:41 | 4:40 | 4:39 | 4:39 | 4:38 | 4:37 | 4:36 | 4:36 | 4:35 | 4:34 | 4:34 | 4:33 | 4:32 | 4:32 | 4:31 | 4:31 | 4:30 | 4:30 | 4:30 |
| Sunset (PM) | 6:20 | 6:21 | 6:22 | 6:22 | 6:23 | 6:24 | 6:25 | 6:26 | 6:27 | 6:28 | 6:28 | 6:29 | 6:30 | 6:31 | 6:32 | 6:33 | 6:33 | 6:34 | 6:35 | 6:36 | 6:37 | 6:37 | 6:38 | 6:39 | 6:40 | 6:40 | 6:41 | 6:42 | 6:43 | 6:43 | 6:44 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 13.4 | 4:53 | 6:20 |
| 2 | 13.5 | 4:52 | 6:21 |
| 3 | 13.5 | 4:51 | 6:22 |
| 4 | 13.5 | 4:50 | 6:22 |
| 5 | 13.6 | 4:49 | 6:23 |
| 6 | 13.6 | 4:48 | 6:24 |
| 7 | 13.6 | 4:47 | 6:25 |
| 8 | 13.7 | 4:46 | 6:26 |
| 9 | 13.7 | 4:45 | 6:27 |
| 10 | 13.7 | 4:44 | 6:28 |
| 11 | 13.8 | 4:43 | 6:28 |
| 12 | 13.8 | 4:42 | 6:29 |
| 13 | 13.8 | 4:41 | 6:30 |
| 14 | 13.8 | 4:40 | 6:31 |
| 15 | 13.9 | 4:39 | 6:32 |
| 16 | 13.9 | 4:39 | 6:33 |
| 17 | 13.9 | 4:38 | 6:33 |
| 18 | 14.0 | 4:37 | 6:34 |
| 19 | 14.0 | 4:36 | 6:35 |
| 20 | 14.0 | 4:36 | 6:36 |
| 21 | 14.0 | 4:35 | 6:37 |
| 22 | 14.1 | 4:34 | 6:37 |
| 23 | 14.1 | 4:34 | 6:38 |
| 24 | 14.1 | 4:33 | 6:39 |
| 25 | 14.1 | 4:32 | 6:40 |
| 26 | 14.1 | 4:32 | 6:40 |
| 27 | 14.2 | 4:31 | 6:41 |
| 28 | 14.2 | 4:31 | 6:42 |
| 29 | 14.2 | 4:30 | 6:43 |
| 30 | 14.2 | 4:30 | 6:43 |
| 31 | 14.2 | 4:30 | 6:44 |
Solar energy in May
Average shortwave solar energy reaching the ground each day in May, about 8.07 kWh/m².
For context, solar energy here swings from a low near 2.87 kWh/m² to a high of 8.53 kWh/m² in June across the year — May's 8.07 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) | 7.8 | 7.8 | 7.8 | 7.8 | 7.9 | 7.9 | 7.9 | 7.9 | 7.9 | 8.0 | 8.0 | 8.0 | 8.0 | 8.0 | 8.0 | 8.1 | 8.1 | 8.1 | 8.1 | 8.1 | 8.2 | 8.2 | 8.2 | 8.2 | 8.2 | 8.3 | 8.3 | 8.3 | 8.3 | 8.3 | 8.4 |
| 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 | 7.8 | Intense |
| 2 | 7.8 | Intense |
| 3 | 7.8 | Intense |
| 4 | 7.8 | Intense |
| 5 | 7.9 | Intense |
| 6 | 7.9 | Intense |
| 7 | 7.9 | Intense |
| 8 | 7.9 | Intense |
| 9 | 7.9 | Intense |
| 10 | 8.0 | Intense |
| 11 | 8.0 | Intense |
| 12 | 8.0 | Intense |
| 13 | 8.0 | Intense |
| 14 | 8.0 | Intense |
| 15 | 8.0 | Intense |
| 16 | 8.1 | Intense |
| 17 | 8.1 | Intense |
| 18 | 8.1 | Intense |
| 19 | 8.1 | Intense |
| 20 | 8.1 | Intense |
| 21 | 8.2 | Intense |
| 22 | 8.2 | Intense |
| 23 | 8.2 | Intense |
| 24 | 8.2 | Intense |
| 25 | 8.2 | Intense |
| 26 | 8.3 | Intense |
| 27 | 8.3 | Intense |
| 28 | 8.3 | Intense |
| 29 | 8.3 | Intense |
| 30 | 8.3 | Intense |
| 31 | 8.4 | Intense |
Is May a good time to visit Boulder City?
Our two travel scores rate May for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).
May is a reasonable time to visit Boulder City for sightseeing. The water and warmth also suit a beach or pool day.
What to pack for Boulder City in May
From May's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In May, Boulder City sees daytime highs around 89°F and nights near 66°F. Pack light clothes and sun protection.
UV index in Boulder City in May
Clear-sky midday UV in May peaks around 8 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Boulder City peaks around June 22 at about 10 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 19 at about 2 (moderate).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 10 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 3 | 4 | 5 | 6 | 8 | 11 | 10 | 10 | 8 | 6 | 3 | 2 |
| Level | Moderate | Moderate | Moderate | High | Very high | Extreme | Extreme | Very high | Very high | High | Moderate | Moderate |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 3 | Moderate |
| Feb | 4 | Moderate |
| Mar | 5 | Moderate |
| Apr | 6 | High |
| May | 8 | Very high |
| Jun | 11 | Extreme |
| Jul | 10 | Extreme |
| Aug | 10 | Very high |
| Sep | 8 | Very high |
| Oct | 6 | High |
| Nov | 3 | Moderate |
| Dec | 2 | Moderate |
Where is Boulder City?
Boulder City sits at 36.0°N, 114.8°W, 2,510 ft above sea level, in United States. The nearest listed city is Henderson, 9.3 mi away.
Topography around Boulder City
How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Boulder City.
Within 2 miles, the terrain around Boulder City has significant variations in elevation — a maximum elevation change of 1,634 ft around an average of 2,431 ft above sea level; within 10 miles, large variations in elevation — a maximum elevation change of 3,455 ft; within 50 miles, extreme variations in elevation — a maximum elevation change of 10,315 ft.
The land around Boulder City is covered by bare terrain (55%) and artificial surfaces (27%) within 2 miles, bare terrain (68%) within 10 miles, and bare terrain (59%) and shrubs (26%) 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 Boulder City (35.9786°, -114.8325°, elevation 2,510 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. 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).