Pasadena weather in May
In May, Pasadena sees average daytime highs of 70°F and overnight lows near 58°F, with 3.8 in of rain across 10.8 wet days and about 14.1 hours of daylight. It is the 5th-warmest and 7th-wettest month of the year here.
Highs climb over the month, from about 66°F in the first days to 74°F by the end. The sky is clear or mostly clear about 28% of the time in May, and the air most often feels dry.
Daylight stretches from about 13 h 36 min at the start of May to 14 h 30 min by month's end. Set against the rest of the year, May is Pasadena's 11th-clearest and 8th-windiest month. For the whole year in context, see Pasadena's year-round climate.
- Daytime high
- 70°
- 5th warmest
- Overnight low
- 58°
- 8th coldest
- Rainfall
- 3.8 in
- 10.8 wet days
- Daylight
- 14 h 06 min
- 4:59 AM – 7:07 PM
- Cloud cover
- 61%
- 11th clearest
- Wind
- 8 mph
- 8th windiest
- Solar energy
- 5.72 kWh/m²
- Travel score
- 6.4
- out of 10
Pasadena is census-designated place in the U.S. state of Maryland.
- Density
- 582/km²
- people per km²
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
Temperature in May
Highs climb over the month, from about 66°F in the first days to 74°F by the end.
A typical May day in Pasadena reaches about 70°F in the afternoon and slips back to 58°F overnight — a 12°F spread between the day's warmth and the night's chill. On most days the high lands between 61°F and 79°F. Set against its neighbours, May runs about 9°F warmer than April and about 9°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) | 66 | 66 | 66 | 67 | 67 | 67 | 67 | 68 | 68 | 68 | 68 | 69 | 69 | 69 | 70 | 70 | 70 | 71 | 71 | 71 | 71 | 72 | 72 | 73 | 73 | 73 | 74 | 74 | 74 | 75 | 75 |
| Avg low (°F) | 54 | 54 | 54 | 55 | 55 | 55 | 55 | 56 | 56 | 56 | 56 | 57 | 57 | 57 | 58 | 58 | 58 | 59 | 59 | 59 | 60 | 60 | 60 | 61 | 61 | 62 | 62 | 62 | 63 | 63 | 63 |
| Avg high (°F) | Avg low (°F) | |
|---|---|---|
| 1 | 66 | 54 |
| 2 | 66 | 54 |
| 3 | 66 | 54 |
| 4 | 67 | 55 |
| 5 | 67 | 55 |
| 6 | 67 | 55 |
| 7 | 67 | 55 |
| 8 | 68 | 56 |
| 9 | 68 | 56 |
| 10 | 68 | 56 |
| 11 | 68 | 56 |
| 12 | 69 | 57 |
| 13 | 69 | 57 |
| 14 | 69 | 57 |
| 15 | 70 | 58 |
| 16 | 70 | 58 |
| 17 | 70 | 58 |
| 18 | 71 | 59 |
| 19 | 71 | 59 |
| 20 | 71 | 59 |
| 21 | 71 | 60 |
| 22 | 72 | 60 |
| 23 | 72 | 60 |
| 24 | 73 | 61 |
| 25 | 73 | 61 |
| 26 | 73 | 62 |
| 27 | 74 | 62 |
| 28 | 74 | 62 |
| 29 | 74 | 63 |
| 30 | 75 | 63 |
| 31 | 75 | 63 |
How May really feels in Pasadena
Once humidity and wind are folded in, May averages 0 days that feel above 90°F and 0 that feel at or below 32°F — the comfort signal a plain temperature reading hides.
May sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.
Pasadena weather by month
How May compares with the rest of the year at a glance. May is the 5th-warmest and 7th-wettest month here — the current month is highlighted below.
| Month | High / Low (°F) | Rainfall (inches) | Wet days | Snow days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|---|
| Jan | 41° / 31° | 3.5 | 9 | 2.7 | 9.6 | 0.1 |
| Feb | 43° / 32° | 3.3 | 9 | 2.8 | 10.5 | 0.6 |
| Mar | 51° / 38° | 4.4 | 10.9 | 1.6 | 11.7 | 2.4 |
| Apr | 61° / 49° | 3.7 | 10.2 | 0.1 | 13 | 5.1 |
| May | 70° / 58° | 3.8 | 10.8 | 0 | 14.1 | 6.4 |
| Jun | 79° / 68° | 3.6 | 10.8 | 0 | 14.7 | 6.4 |
| Jul | 84° / 73° | 4.2 | 11.7 | 0 | 14.5 | 5.4 |
| Aug | 82° / 72° | 4.0 | 10.2 | 0 | 13.5 | 6.1 |
| Sep | 76° / 66° | 4.6 | 9.2 | 0 | 12.3 | 7.0 |
| Oct | 66° / 55° | 3.9 | 8.2 | 0 | 11 | 6.3 |
| Nov | 55° / 44° | 3.3 | 8.1 | 0.1 | 9.9 | 3.7 |
| Dec | 46° / 36° | 4.1 | 9.5 | 1.3 | 9.3 | 1.2 |
Cloud cover in May
The sky is clear or mostly clear about 28% of the time in May.
Beyond those clear spells, partly cloudy skies cover about 19% of May, with mostly cloudy or overcast conditions the remaining 53%.
| 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 (%) | 46 | 47 | 47 | 47 | 48 | 48 | 48 | 48 | 47 | 48 | 48 | 47 | 47 | 47 | 47 | 47 | 48 | 47 | 46 | 46 | 46 | 46 | 46 | 47 | 47 | 47 | 47 | 48 | 48 | 47 | 48 |
| Cloudier (%) | 54 | 53 | 53 | 53 | 52 | 52 | 52 | 52 | 53 | 52 | 52 | 53 | 53 | 53 | 53 | 53 | 52 | 53 | 54 | 54 | 54 | 54 | 54 | 53 | 53 | 53 | 53 | 52 | 52 | 53 | 52 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 46 | 54 |
| 2 | 47 | 53 |
| 3 | 47 | 53 |
| 4 | 47 | 53 |
| 5 | 48 | 52 |
| 6 | 48 | 52 |
| 7 | 48 | 52 |
| 8 | 48 | 52 |
| 9 | 47 | 53 |
| 10 | 48 | 52 |
| 11 | 48 | 52 |
| 12 | 47 | 53 |
| 13 | 47 | 53 |
| 14 | 47 | 53 |
| 15 | 47 | 53 |
| 16 | 47 | 53 |
| 17 | 48 | 52 |
| 18 | 47 | 53 |
| 19 | 46 | 54 |
| 20 | 46 | 54 |
| 21 | 46 | 54 |
| 22 | 46 | 54 |
| 23 | 46 | 54 |
| 24 | 47 | 53 |
| 25 | 47 | 53 |
| 26 | 47 | 53 |
| 27 | 47 | 53 |
| 28 | 48 | 52 |
| 29 | 48 | 52 |
| 30 | 47 | 53 |
| 31 | 48 | 52 |
Chance of precipitation in May
Pasadena gets around 3.8 in of rain over 10.8 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 35% and peaks near 37% 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 (%) | 33 | 33 | 33 | 33 | 33 | 33 | 33 | 33 | 33 | 34 | 34 | 34 | 35 | 35 | 35 | 35 | 35 | 36 | 36 | 36 | 37 | 37 | 37 | 37 | 36 | 36 | 36 | 36 | 35 | 35 | 35 |
| Rain chance (%) | |
|---|---|
| 1 | 33 |
| 2 | 33 |
| 3 | 33 |
| 4 | 33 |
| 5 | 33 |
| 6 | 33 |
| 7 | 33 |
| 8 | 33 |
| 9 | 33 |
| 10 | 34 |
| 11 | 34 |
| 12 | 34 |
| 13 | 35 |
| 14 | 35 |
| 15 | 35 |
| 16 | 35 |
| 17 | 35 |
| 18 | 36 |
| 19 | 36 |
| 20 | 36 |
| 21 | 37 |
| 22 | 37 |
| 23 | 37 |
| 24 | 37 |
| 25 | 36 |
| 26 | 36 |
| 27 | 36 |
| 28 | 36 |
| 29 | 35 |
| 30 | 35 |
| 31 | 35 |
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 52% of days. Sticky, muggy-or-worse air turns up on roughly 10% 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dry (%) | 74 | 72 | 71 | 69 | 67 | 67 | 64 | 63 | 62 | 61 | 60 | 58 | 57 | 56 | 56 | 54 | 53 | 51 | 49 | 47 | 45 | 43 | 41 | 40 | 38 | 36 | 34 | 33 | 31 | 30 | 28 |
| Comfortable (%) | 18 | 19 | 20 | 21 | 22 | 22 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 23 | 23 | 23 | 23 | 23 |
| Humid (%) | 7 | 8 | 8 | 9 | 10 | 10 | 11 | 12 | 13 | 13 | 14 | 15 | 15 | 16 | 16 | 17 | 17 | 18 | 19 | 19 | 20 | 20 | 21 | 21 | 21 | 22 | 22 | 22 | 23 | 23 | 23 |
| Muggy (%) | 1 | 1 | 1 | 1 | 1 | 1 | 2 | 2 | 2 | 3 | 3 | 4 | 5 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 |
| Oppressive (%) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 1 | 2 | 2 | 2 | 2 | 2 | 3 | 3 |
| Dry (%) | Comfortable (%) | Humid (%) | Muggy (%) | Oppressive (%) | |
|---|---|---|---|---|---|
| 1 | 74 | 18 | 7 | 1 | 0 |
| 2 | 72 | 19 | 8 | 1 | 0 |
| 3 | 71 | 20 | 8 | 1 | 0 |
| 4 | 69 | 21 | 9 | 1 | 0 |
| 5 | 67 | 22 | 10 | 1 | 0 |
| 6 | 67 | 22 | 10 | 1 | 0 |
| 7 | 64 | 23 | 11 | 2 | 0 |
| 8 | 63 | 23 | 12 | 2 | 0 |
| 9 | 62 | 23 | 13 | 2 | 0 |
| 10 | 61 | 23 | 13 | 3 | 0 |
| 11 | 60 | 23 | 14 | 3 | 0 |
| 12 | 58 | 23 | 15 | 4 | 0 |
| 13 | 57 | 23 | 15 | 5 | 0 |
| 14 | 56 | 23 | 16 | 5 | 0 |
| 15 | 56 | 22 | 16 | 6 | 0 |
| 16 | 54 | 22 | 17 | 7 | 0 |
| 17 | 53 | 22 | 17 | 8 | 0 |
| 18 | 51 | 22 | 18 | 9 | 0 |
| 19 | 49 | 22 | 19 | 10 | 0 |
| 20 | 47 | 22 | 19 | 11 | 0 |
| 21 | 45 | 22 | 20 | 13 | 1 |
| 22 | 43 | 22 | 20 | 14 | 1 |
| 23 | 41 | 22 | 21 | 15 | 1 |
| 24 | 40 | 22 | 21 | 16 | 1 |
| 25 | 38 | 22 | 21 | 17 | 2 |
| 26 | 36 | 22 | 22 | 18 | 2 |
| 27 | 34 | 23 | 22 | 19 | 2 |
| 28 | 33 | 23 | 22 | 20 | 2 |
| 29 | 31 | 23 | 23 | 21 | 2 |
| 30 | 30 | 23 | 23 | 22 | 3 |
| 31 | 28 | 23 | 23 | 23 | 3 |
Wind in May
Winds average 8 mph in May.
Across May, daily wind ranges from about 7 mph on the calmest days to 8 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) | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 7 |
| 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 | 8 | light breeze |
| 2 | 8 | light breeze |
| 3 | 8 | light breeze |
| 4 | 8 | light breeze |
| 5 | 8 | light breeze |
| 6 | 8 | light breeze |
| 7 | 8 | light breeze |
| 8 | 8 | light breeze |
| 9 | 8 | light breeze |
| 10 | 8 | light breeze |
| 11 | 8 | light breeze |
| 12 | 8 | light breeze |
| 13 | 8 | light breeze |
| 14 | 8 | light breeze |
| 15 | 8 | light breeze |
| 16 | 8 | light breeze |
| 17 | 8 | light breeze |
| 18 | 8 | light breeze |
| 19 | 8 | light breeze |
| 20 | 8 | light breeze |
| 21 | 8 | light breeze |
| 22 | 8 | light breeze |
| 23 | 8 | light breeze |
| 24 | 8 | light breeze |
| 25 | 8 | light breeze |
| 26 | 8 | light breeze |
| 27 | 8 | light breeze |
| 28 | 8 | light breeze |
| 29 | 8 | light breeze |
| 30 | 8 | light breeze |
| 31 | 7 | light breeze |
Sunrise & sunset in May
Daylight runs from about 13 h 36 min at the start of May to 14 h 30 min by month's end. The lit band spans sunrise to sunset each day.
Days grow by about 54 minutes over May. Sunrise moves from 5:15 AM to 4:48 AM, and sunset from 6:52 PM to 7:19 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) | 13.6 | 13.7 | 13.7 | 13.7 | 13.8 | 13.8 | 13.8 | 13.9 | 13.9 | 13.9 | 14.0 | 14.0 | 14.0 | 14.1 | 14.1 | 14.1 | 14.2 | 14.2 | 14.2 | 14.3 | 14.3 | 14.3 | 14.3 | 14.4 | 14.4 | 14.4 | 14.4 | 14.5 | 14.5 | 14.5 | 14.5 |
| Sunrise (AM) | 5:15 | 5:14 | 5:12 | 5:11 | 5:10 | 5:09 | 5:08 | 5:07 | 5:06 | 5:04 | 5:03 | 5:02 | 5:01 | 5:00 | 4:59 | 4:59 | 4:58 | 4:57 | 4:56 | 4:55 | 4:54 | 4:54 | 4:53 | 4:52 | 4:52 | 4:51 | 4:50 | 4:50 | 4:49 | 4:49 | 4:48 |
| Sunset (PM) | 6:52 | 6:53 | 6:54 | 6:55 | 6:56 | 6:57 | 6:58 | 6:59 | 7:00 | 7:01 | 7:02 | 7:03 | 7:04 | 7:05 | 7:06 | 7:07 | 7:07 | 7:08 | 7:09 | 7:10 | 7:11 | 7:12 | 7:13 | 7:14 | 7:14 | 7:15 | 7:16 | 7:17 | 7:18 | 7:18 | 7:19 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 13.6 | 5:15 | 6:52 |
| 2 | 13.7 | 5:14 | 6:53 |
| 3 | 13.7 | 5:12 | 6:54 |
| 4 | 13.7 | 5:11 | 6:55 |
| 5 | 13.8 | 5:10 | 6:56 |
| 6 | 13.8 | 5:09 | 6:57 |
| 7 | 13.8 | 5:08 | 6:58 |
| 8 | 13.9 | 5:07 | 6:59 |
| 9 | 13.9 | 5:06 | 7:00 |
| 10 | 13.9 | 5:04 | 7:01 |
| 11 | 14.0 | 5:03 | 7:02 |
| 12 | 14.0 | 5:02 | 7:03 |
| 13 | 14.0 | 5:01 | 7:04 |
| 14 | 14.1 | 5:00 | 7:05 |
| 15 | 14.1 | 4:59 | 7:06 |
| 16 | 14.1 | 4:59 | 7:07 |
| 17 | 14.2 | 4:58 | 7:07 |
| 18 | 14.2 | 4:57 | 7:08 |
| 19 | 14.2 | 4:56 | 7:09 |
| 20 | 14.3 | 4:55 | 7:10 |
| 21 | 14.3 | 4:54 | 7:11 |
| 22 | 14.3 | 4:54 | 7:12 |
| 23 | 14.3 | 4:53 | 7:13 |
| 24 | 14.4 | 4:52 | 7:14 |
| 25 | 14.4 | 4:52 | 7:14 |
| 26 | 14.4 | 4:51 | 7:15 |
| 27 | 14.4 | 4:50 | 7:16 |
| 28 | 14.5 | 4:50 | 7:17 |
| 29 | 14.5 | 4:49 | 7:18 |
| 30 | 14.5 | 4:49 | 7:18 |
| 31 | 14.5 | 4:48 | 7:19 |
Solar energy in May
Average shortwave solar energy reaching the ground each day in May, about 5.72 kWh/m².
For context, solar energy here swings from a low near 1.94 kWh/m² to a high of 6.1 kWh/m² in June across the year — May's 5.72 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) | 5.5 | 5.5 | 5.5 | 5.5 | 5.6 | 5.6 | 5.6 | 5.6 | 5.6 | 5.6 | 5.6 | 5.6 | 5.6 | 5.7 | 5.7 | 5.7 | 5.7 | 5.7 | 5.7 | 5.7 | 5.8 | 5.8 | 5.8 | 5.8 | 5.8 | 5.8 | 5.9 | 5.9 | 5.9 | 5.9 | 5.9 |
| Level | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| 1 | 5.5 | Bright |
| 2 | 5.5 | Bright |
| 3 | 5.5 | Bright |
| 4 | 5.5 | Bright |
| 5 | 5.6 | Bright |
| 6 | 5.6 | Bright |
| 7 | 5.6 | Bright |
| 8 | 5.6 | Bright |
| 9 | 5.6 | Bright |
| 10 | 5.6 | Bright |
| 11 | 5.6 | Bright |
| 12 | 5.6 | Bright |
| 13 | 5.6 | Bright |
| 14 | 5.7 | Bright |
| 15 | 5.7 | Bright |
| 16 | 5.7 | Bright |
| 17 | 5.7 | Bright |
| 18 | 5.7 | Bright |
| 19 | 5.7 | Bright |
| 20 | 5.7 | Bright |
| 21 | 5.8 | Bright |
| 22 | 5.8 | Bright |
| 23 | 5.8 | Bright |
| 24 | 5.8 | Bright |
| 25 | 5.8 | Bright |
| 26 | 5.8 | Bright |
| 27 | 5.9 | Bright |
| 28 | 5.9 | Bright |
| 29 | 5.9 | Bright |
| 30 | 5.9 | Bright |
| 31 | 5.9 | Bright |
Hazard calendar for Pasadena
None of Pasadena's seasonal hazards are active in May. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.
Pasadena sits in the Atlantic hurricane belt; the season peaks August–October.
Is May a good time to visit Pasadena?
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 Pasadena for sightseeing.
What to pack for Pasadena in May
From May's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In May, Pasadena sees daytime highs around 70°F and nights near 58°F. Worth packing: rain gear and sun protection. About 11 days see rain.
Sea temperature near Pasadena in May
The nearest coast averages about 58°F in May — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea at the nearest coast (about 11 mi away) is warmest in August at about 78°F and coldest in February near 36°F.
It's comfortable for a long swim from Jun 16 to Oct 5 — about 3.7 months when the water holds above 68°F.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°F) | 38 | 36 | 40 | 47 | 58 | 68 | 76 | 78 | 74 | 65 | 53 | 44 |
| Comfort | Bracing | Bracing | Bracing | Bracing | Bracing | Refreshing | Warm | Warm | Refreshing | Cool | Bracing | Bracing |
| Sea temperature (°F) | Comfort | |
|---|---|---|
| Jan | 38 | Bracing |
| Feb | 36 | Bracing |
| Mar | 40 | Bracing |
| Apr | 47 | Bracing |
| May | 58 | Bracing |
| Jun | 68 | Refreshing |
| Jul | 76 | Warm |
| Aug | 78 | Warm |
| Sep | 74 | Refreshing |
| Oct | 65 | Cool |
| Nov | 53 | Bracing |
| Dec | 44 | Bracing |
UV index in Pasadena in May
Clear-sky midday UV in May peaks around 8 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Pasadena peaks around July 10 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 20 at about 2 (low).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 8 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 2 | 3 | 5 | 6 | 8 | 9 | 9 | 6 | 6 | 4 | 3 | 2 |
| Level | Low | Moderate | Moderate | High | Very high | Very high | Very high | High | High | Moderate | Moderate | Low |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 2 | Low |
| Feb | 3 | Moderate |
| Mar | 5 | Moderate |
| Apr | 6 | High |
| May | 8 | Very high |
| Jun | 9 | Very high |
| Jul | 9 | Very high |
| Aug | 6 | High |
| Sep | 6 | High |
| Oct | 4 | Moderate |
| Nov | 3 | Moderate |
| Dec | 2 | Low |
Air quality in Pasadena in May
Average fine-particle pollution (PM2.5) through the year — so you can see where May falls, not just the annual average.
Air quality in Pasadena is worst in July — around 17 µg/m³ PM2.5 (moderate), about 2.0× the cleanest month (November, 8 µg/m³).
Modeled monthly averages (CAMS reanalysis, 2015–2024).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 10 | 12 | 13 | 13 | 15 | 16 | 17 | 14 | 12 | 9 | 8 | 10 |
| Level | Good | Good | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Good | Good | Good | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 10 | Good |
| Feb | 12 | Good |
| Mar | 13 | Moderate |
| Apr | 13 | Moderate |
| May | 15 | Moderate |
| Jun | 16 | Moderate |
| Jul | 17 | Moderate |
| Aug | 14 | Moderate |
| Sep | 12 | Good |
| Oct | 9 | Good |
| Nov | 8 | Good |
| Dec | 10 | Good |
Where is Pasadena?
Pasadena sits at 39.1°N, 76.6°W, 82 ft above sea level, in United States. The nearest listed city is Green Haven, 1.9 mi away.
Topography around Pasadena
How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Pasadena.
Within 2 miles, the terrain around Pasadena has only modest variations in elevation — a maximum elevation change of 210 ft around an average of 95 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 394 ft; within 50 miles, significant variations in elevation — a maximum elevation change of 1,316 ft.
The land around Pasadena is covered by trees (75%) within 2 miles, trees (53%) and water (24%) within 10 miles, and trees (53%) 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 Pasadena (39.119°, -76.5711°, elevation 82 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. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).