Fullerton weather in May: Fullerton, California: normal highs, lows, rain and records for May
Fullerton in May has a normal high of 76°F and a normal low of 58°F, a daily mean of 67°F, holding near 76°F all month. Measurable precipitation falls on 2 days in a normal May, 0.30 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 24°C and low of 15°C, 8 mm of precipitation in May.
- NOAA stationFullerton Municipal Airport
- Station IDUSW00003166
- Location33.87°N 117.98°W
- Elevation96 ft (29 m)
- From the center3 miles
- Population140,054
- Jan 69° 46°
- Feb 69° 48°
- Mar 71° 52°
- Apr 74° 54°
- May 76° 58°
- Jun 79° 63°
- Jul 84° 66°
- Aug 87° 66°
- Sep 85° 65°
- Oct 80° 58°
- Nov 74° 51°
- Dec 68° 46°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Fullerton in May?
The normal high is 76°F and the normal low 58°F, for a daily mean of 66.9°F. May is 2.9°F warmer than April and 3.9°F cooler than June. May is the 6th warmest month of the year in Fullerton and the 8th wettest. From one year to the next May's mean temperature typically moves about 2.4°F either way (NOAA's standard deviation), so roughly two Mays in three average between 65°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 8%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| May 1 | 76°F | 56°F | 8% | 3% |
| May 8 | 76°F | 57°F | 7% | 3% |
| May 15 | 76°F | 58°F | 6% | 3% |
| May 22 | 76°F | 59°F | 5% | 2% |
| May 31 | 76°F | 60°F | 4% | 1% |
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 | 76°F | 56°F | 8% | 3% | 13 h 30 min |
| May 2 | 76°F | 56°F | 8% | 3% | 13 h 30 min |
| May 3 | 76°F | 56°F | 8% | 3% | 13 h 30 min |
| May 4 | 76°F | 56°F | 8% | 3% | 13 h 40 min |
| May 5 | 76°F | 56°F | 8% | 3% | 13 h 40 min |
| May 6 | 76°F | 57°F | 8% | 3% | 13 h 40 min |
| May 7 | 76°F | 57°F | 7% | 3% | 13 h 40 min |
| May 8 | 76°F | 57°F | 7% | 3% | 13 h 40 min |
| May 9 | 76°F | 57°F | 7% | 3% | 13 h 40 min |
| May 10 | 76°F | 57°F | 7% | 3% | 13 h 50 min |
| May 11 | 76°F | 57°F | 7% | 3% | 13 h 50 min |
| May 12 | 76°F | 58°F | 7% | 3% | 13 h 50 min |
| May 13 | 76°F | 58°F | 6% | 3% | 13 h 50 min |
| May 14 | 76°F | 58°F | 6% | 3% | 13 h 50 min |
| May 15 | 76°F | 58°F | 6% | 3% | 13 h 50 min |
| May 16 | 76°F | 58°F | 6% | 3% | 14 h |
| May 17 | 76°F | 58°F | 6% | 2% | 14 h |
| May 18 | 76°F | 59°F | 6% | 2% | 14 h |
| May 19 | 76°F | 59°F | 6% | 2% | 14 h |
| May 20 | 76°F | 59°F | 5% | 2% | 14 h |
| May 21 | 76°F | 59°F | 5% | 2% | 14 h |
| May 22 | 76°F | 59°F | 5% | 2% | 14 h |
| May 23 | 76°F | 59°F | 5% | 2% | 14 h |
| May 24 | 76°F | 59°F | 5% | 2% | 14 h 10 min |
| May 25 | 76°F | 60°F | 5% | 2% | 14 h 10 min |
| May 26 | 76°F | 60°F | 4% | 2% | 14 h 10 min |
| May 27 | 76°F | 60°F | 4% | 2% | 14 h 10 min |
| May 28 | 76°F | 60°F | 4% | 2% | 14 h 10 min |
| May 29 | 76°F | 60°F | 4% | 2% | 14 h 10 min |
| May 30 | 76°F | 60°F | 4% | 1% | 14 h 10 min |
| May 31 | 76°F | 60°F | 4% | 1% | 14 h 10 min |
- Normal high
- 76°FMay average
- Normal low
- 58°FMay average
- Precipitation
- 0.30 inmonth total
- Days with precipitation
- 20.01 inch or more
- Days at 90°F or more
- 2
- 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
- 8
- Sunshine
- 83%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00003166; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Fullerton in May?
On a given May day the chance of 0.01 inch or more is 6% on average, highest around May 1 (8%). In all, 0.30 in falls on 2 days of a normal May.
In a normal May in Fullerton, 2 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00003166.
What are the records for May in Fullerton?
The warmest May temperature on this station's record (since 1998) is 104°F, on May 3, 2004; the coldest is 46°F, on May 1, 1999. The wettest May brought 1.24 in (2019).
The May mean against the 1991-2020 normal of 66.9°F: 2021 68.1°F (+1.2), 2022 66.6°F (−0.3), 2023 64.1°F (−2.8), 2024 64.9°F (−2.0), 2025 68.3°F (+1.4), 2026 67.0°F (+0.1). 3 of 6 ran warmer than normal.
| May | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 68.1°F | +1.2°F | 0.09 in |
| 2022 | 66.6°F | −0.3°F | 0.00 in |
| 2023 | 64.1°F | −2.8°F | 0.82 in |
| 2024 | 64.9°F | −2.0°F | 0.10 in |
| 2025 | 68.3°F | +1.4°F | 0.02 in |
| 2026 | 67.0°F | +0.1°F | 0.06 in |
Source: records: ACIS, station USW00003166; recent months: ACIS, station USW00003166. Records and recent months use complete months only.
How does May in Fullerton 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; Fullerton's is 76°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.