National City Weather in May
Average highs run from 69°F on May 1 to 69°F on May 31, and lows from 56°F to 60°F. Normal precipitation for the month is 0.27 in over about 1 wet days.
May day by day
The normal high and low for each date, and the record, in °F.
- Normal low
- Normal high
- Record high
- Record low
May at a glance
- Average high
- 69°F
- Average low
- 58°F
- Precipitation
- 0.27 in
- Record high
- 97°FMay 15, 2014
- Record low
- 48°FMay 1, 1967
- Chance of a freeze
- 0%
- Daylight
- 13 h 29 min to 14 h 09 min
- Cloud cover
- 35%
- Humidity
- 68%
- Dew point
- 49°F
- Wind
- 7.2 mph
Every day of the month
A wet day has at least 0.01 inch of precipitation.
| Date | Normal high | Normal low | Record high | Record low | Chance wet |
|---|---|---|---|---|---|
| May 1 | 69°F | 56°F | 95°F 2014 | 48°F 1967 | 7% |
| May 2 | 69°F | 56°F | 93°F 2004 | 50°F 1951 | 7% |
| May 3 | 69°F | 56°F | 93°F 2004 | 49°F 1955 | 7% |
| May 4 | 69°F | 56°F | 90°F 1953 | 51°F 1949 | 6% |
| May 5 | 69°F | 56°F | 96°F 1953 | 48°F 1950 | 6% |
| May 6 | 69°F | 57°F | 87°F 1990 | 50°F 1964 | 6% |
| May 7 | 69°F | 57°F | 85°F 1941 | 49°F 1964 | 6% |
| May 8 | 69°F | 57°F | 86°F 2007 | 49°F 1965 | 6% |
| May 9 | 69°F | 57°F | 87°F 1984 | 50°F 1964 | 6% |
| May 10 | 69°F | 57°F | 85°F 1943 | 51°F 2003 | 5% |
| May 11 | 69°F | 57°F | 83°F 1996 | 53°F 1948 | 5% |
| May 12 | 69°F | 58°F | 88°F 1979 | 49°F 2022 | 5% |
| May 13 | 69°F | 58°F | 94°F 1979 | 51°F 1967 | 5% |
| May 14 | 69°F | 58°F | 93°F 2014 | 52°F 1942 | 5% |
| May 15 | 69°F | 58°F | 97°F 2014 | 52°F 1968 | 5% |
| May 16 | 69°F | 58°F | 92°F 1956 | 51°F 1955 | 5% |
| May 17 | 69°F | 58°F | 94°F 1956 | 50°F 1962 | 5% |
| May 18 | 69°F | 59°F | 86°F 1983 | 50°F 1943 | 4% |
| May 19 | 69°F | 59°F | 87°F 1943 | 51°F 1944 | 4% |
| May 20 | 69°F | 59°F | 87°F 1942 | 52°F 1945 | 4% |
| May 21 | 69°F | 59°F | 85°F 1941 | 49°F 1948 | 4% |
| May 22 | 69°F | 59°F | 80°F 1958 | 53°F 1948 | 4% |
| May 23 | 69°F | 59°F | 79°F 1949 | 54°F 1949 | 4% |
| May 24 | 69°F | 59°F | 76°F 2021 | 51°F 1945 | 4% |
| May 25 | 69°F | 59°F | 86°F 1941 | 53°F 1950 | 4% |
| May 26 | 69°F | 59°F | 80°F 1941 | 52°F 1953 | 4% |
| May 27 | 69°F | 60°F | 80°F 1960 | 52°F 1942 | 4% |
| May 28 | 69°F | 60°F | 86°F 1997 | 53°F 1964 | 3% |
| May 29 | 69°F | 60°F | 88°F 1978 | 53°F 1953 | 3% |
| May 30 | 69°F | 60°F | 77°F 1946 | 53°F 1953 | 3% |
| May 31 | 69°F | 60°F | 82°F 2004 | 55°F 1940 | 3% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (PDT).
- May 1
- sunrise 6:01 AM, sunset 7:30 PM
- May 31
- sunrise 5:42 AM, sunset 7:51 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00041758 (Chula Vista), public domain. Records: NOAA GHCN-Daily, station USW00023188, every year on file, quality-flagged values removed. Cloud, humidity, wind and sunshine: NASA POWER (MERRA-2, CERES and GEWEX SRB), 1991-2020. The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center's Prediction Of Worldwide Energy Resources (POWER) project funded through the NASA Earth Science Division: POWER Daily API v2, accessed 2026-09-24. Sun and moon: computed with the NOAA solar equations and Meeus.