Pasadena weather in May: Pasadena, California: normal highs, lows, rain and records for May
Pasadena in May has a normal high of 78°F and a normal low of 54°F, a daily mean of 66°F, rising from 77°F on the 1st to 80°F by the 31st. Measurable precipitation falls on 3 days in a normal May, 0.48 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 26°C and low of 12°C, 12 mm of precipitation in May.
- NOAA stationPasadena
- Station IDUSC00046719
- Location34.15°N 118.14°W
- Elevation864 ft (263 m)
- From the centerunder 1 mile
- Population137,195
- Jan 68° 46°
- Feb 69° 46°
- Mar 73° 48°
- Apr 76° 51°
- May 78° 54°
- Jun 84° 58°
- Jul 89° 62°
- Aug 91° 63°
- Sep 90° 62°
- Oct 83° 56°
- Nov 75° 50°
- Dec 67° 45°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Pasadena in May?
The normal high is 78°F and the normal low 54°F, for a daily mean of 66.1°F. May is 2.7°F warmer than April and 4.6°F cooler than June. May is the 6th warmest month of the year in Pasadena and the 8th wettest. Across the month the normal high rises 3°F, from 77°F on May 1 to 80°F on May 31. From one year to the next May's mean temperature typically moves about 2.7°F either way (NOAA's standard deviation), so roughly two Mays in three average between 63°F and 69°F.
Bars above: each day's normal high to low. Columns below: the chance of 0.01 inch or more of precipitation that day, on a scale of 0 to 100% (highest 10%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| May 1 | 77°F | 52°F | 10% | 4% |
| May 8 | 78°F | 53°F | 10% | 4% |
| May 15 | 78°F | 54°F | 9% | 4% |
| May 22 | 79°F | 55°F | 9% | 3% |
| May 31 | 80°F | 55°F | 7% | 2% |
Every day of May: normal high, low and chance of precipitation (warmest afternoon May 31, coldest night May 1)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| May 1 | 77°F | 52°F | 10% | 4% | 13 h 30 min |
| May 2 | 77°F | 52°F | 10% | 4% | 13 h 30 min |
| May 3 | 77°F | 53°F | 10% | 4% | 13 h 30 min |
| May 4 | 78°F | 53°F | 10% | 4% | 13 h 40 min |
| May 5 | 78°F | 53°F | 10% | 4% | 13 h 40 min |
| May 6 | 78°F | 53°F | 10% | 4% | 13 h 40 min |
| May 7 | 78°F | 53°F | 10% | 4% | 13 h 40 min |
| May 8 | 78°F | 53°F | 10% | 4% | 13 h 40 min |
| May 9 | 78°F | 53°F | 9% | 4% | 13 h 50 min |
| May 10 | 78°F | 53°F | 9% | 4% | 13 h 50 min |
| May 11 | 78°F | 53°F | 9% | 4% | 13 h 50 min |
| May 12 | 78°F | 54°F | 9% | 4% | 13 h 50 min |
| May 13 | 78°F | 54°F | 9% | 4% | 13 h 50 min |
| May 14 | 78°F | 54°F | 9% | 4% | 13 h 50 min |
| May 15 | 78°F | 54°F | 9% | 4% | 13 h 50 min |
| May 16 | 78°F | 54°F | 9% | 4% | 14 h |
| May 17 | 78°F | 54°F | 9% | 4% | 14 h |
| May 18 | 78°F | 54°F | 9% | 4% | 14 h |
| May 19 | 78°F | 54°F | 9% | 3% | 14 h |
| May 20 | 78°F | 54°F | 9% | 3% | 14 h |
| May 21 | 79°F | 54°F | 9% | 3% | 14 h |
| May 22 | 79°F | 55°F | 9% | 3% | 14 h |
| May 23 | 79°F | 55°F | 8% | 3% | 14 h 10 min |
| May 24 | 79°F | 55°F | 8% | 3% | 14 h 10 min |
| May 25 | 79°F | 55°F | 8% | 3% | 14 h 10 min |
| May 26 | 79°F | 55°F | 8% | 3% | 14 h 10 min |
| May 27 | 79°F | 55°F | 8% | 3% | 14 h 10 min |
| May 28 | 80°F | 55°F | 8% | 3% | 14 h 10 min |
| May 29 | 80°F | 55°F | 8% | 3% | 14 h 10 min |
| May 30 | 80°F | 55°F | 7% | 3% | 14 h 10 min |
| May 31 | 80°F | 55°F | 7% | 2% | 14 h 10 min |
- Normal high
- 78°FMay average
- Normal low
- 54°FMay average
- Precipitation
- 0.48 inmonth total
- Days with precipitation
- 30.01 inch or more
- Days at 90°F or more
- 3
- Daylight
- 13 h 30 min to 14 h 10 minMay 1 to May 31
- Days at 70°F or more
- 27
- Days at 80°F or more
- 14
- Sunshine
- 89%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USC00046719; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Pasadena in May?
On a given May day the chance of 0.01 inch or more is 9% on average, highest around May 1 (10%). In all, 0.48 in falls on 3 days of a normal May.
In a normal May in Pasadena, 3 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USC00046719.
What are the records for May in Pasadena?
The warmest May temperature on this station's record (since 1893) is 104°F, on May 15, 2014; the coldest is 32°F, on May 1, 1915. The wettest May brought 5.36 in (1921).
The May mean against the 1991-2020 normal of 66.1°F: 2021 68.8°F (+2.7), 2022 68.9°F (+2.8), 2023 65.2°F (−0.9), 2024 64.8°F (−1.3), 2025 68.8°F (+2.7), 2026 67.4°F (+1.3). 4 of 6 ran warmer than normal.
| May | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 68.8°F | +2.7°F | 0.12 in |
| 2022 | 68.9°F | +2.8°F | 0.07 in |
| 2023 | 65.2°F | −0.9°F | 2.09 in |
| 2024 | 64.8°F | −1.3°F | 0.23 in |
| 2025 | 68.8°F | +2.7°F | 0.24 in |
| 2026 | 67.4°F | +1.3°F | 0.15 in |
Source: records: ACIS, station USC00046719; recent months: ACIS, station USC00046719. Records and recent months use complete months only.
How does May in Pasadena compare across California?
Across the 219 places PlainClimate covers in California, May normal highs run from 58°F in Tahoma to 96°F in Needles; Pasadena's is 78°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.