Half Moon Bay weather in May: Half Moon Bay, California: normal highs, lows, rain and records for May
Half Moon Bay in May has a normal high of 62°F and a normal low of 48°F, a daily mean of 55°F, rising from 61°F on the 1st to 63°F by the 31st. Measurable precipitation falls on 7 days in a normal May, 0.96 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 17°C and low of 9°C, 24 mm of precipitation in May.
- NOAA stationHalf Moon Bay
- Station IDUSC00043714
- Location37.47°N 122.44°W
- Elevation27 ft (8 m)
- Population11,324
- Jan 59° 43°
- Feb 60° 43°
- Mar 60° 44°
- Apr 61° 45°
- May 62° 48°
- Jun 64° 50°
- Jul 65° 53°
- Aug 66° 54°
- Sep 66° 51°
- Oct 66° 48°
- Nov 63° 45°
- Dec 59° 43°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Half Moon Bay in May?
The normal high is 62°F and the normal low 48°F, for a daily mean of 54.9°F. May is 2.0°F warmer than April and 2.0°F cooler than June. May is the 6th warmest month of the year in Half Moon Bay and the 8th wettest. Across the month the normal high rises 2°F, from 61°F on May 1 to 63°F on May 31. From one year to the next May's mean temperature typically moves about 2.0°F either way (NOAA's standard deviation), so roughly two Mays in three average between 53°F and 57°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 24%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| May 1 | 61°F | 46°F | 24% | 10% |
| May 8 | 61°F | 47°F | 23% | 8% |
| May 15 | 62°F | 48°F | 23% | 8% |
| May 22 | 62°F | 49°F | 22% | 7% |
| May 31 | 63°F | 49°F | 21% | 5% |
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 | 61°F | 46°F | 24% | 10% | 13 h 40 min |
| May 2 | 61°F | 46°F | 24% | 10% | 13 h 40 min |
| May 3 | 61°F | 47°F | 24% | 9% | 13 h 50 min |
| May 4 | 61°F | 47°F | 24% | 9% | 13 h 50 min |
| May 5 | 61°F | 47°F | 24% | 9% | 13 h 50 min |
| May 6 | 61°F | 47°F | 23% | 9% | 13 h 50 min |
| May 7 | 61°F | 47°F | 23% | 8% | 13 h 50 min |
| May 8 | 61°F | 47°F | 23% | 8% | 14 h |
| May 9 | 61°F | 47°F | 23% | 8% | 14 h |
| May 10 | 61°F | 47°F | 23% | 8% | 14 h |
| May 11 | 61°F | 48°F | 23% | 8% | 14 h |
| May 12 | 61°F | 48°F | 23% | 8% | 14 h |
| May 13 | 61°F | 48°F | 23% | 8% | 14 h 10 min |
| May 14 | 62°F | 48°F | 23% | 8% | 14 h 10 min |
| May 15 | 62°F | 48°F | 23% | 8% | 14 h 10 min |
| May 16 | 62°F | 48°F | 23% | 7% | 14 h 10 min |
| May 17 | 62°F | 48°F | 23% | 7% | 14 h 10 min |
| May 18 | 62°F | 48°F | 23% | 7% | 14 h 10 min |
| May 19 | 62°F | 49°F | 23% | 7% | 14 h 20 min |
| May 20 | 62°F | 49°F | 23% | 7% | 14 h 20 min |
| May 21 | 62°F | 49°F | 22% | 7% | 14 h 20 min |
| May 22 | 62°F | 49°F | 22% | 7% | 14 h 20 min |
| May 23 | 62°F | 49°F | 22% | 7% | 14 h 20 min |
| May 24 | 62°F | 49°F | 22% | 6% | 14 h 20 min |
| May 25 | 62°F | 49°F | 22% | 6% | 14 h 20 min |
| May 26 | 62°F | 49°F | 22% | 6% | 14 h 30 min |
| May 27 | 63°F | 49°F | 22% | 6% | 14 h 30 min |
| May 28 | 63°F | 49°F | 21% | 6% | 14 h 30 min |
| May 29 | 63°F | 49°F | 21% | 6% | 14 h 30 min |
| May 30 | 63°F | 49°F | 21% | 6% | 14 h 30 min |
| May 31 | 63°F | 49°F | 21% | 5% | 14 h 30 min |
- Normal high
- 62°FMay average
- Normal low
- 48°FMay average
- Precipitation
- 0.96 inmonth total
- Days with precipitation
- 70.01 inch or more
- Daylight
- 13 h 40 min to 14 h 30 minMay 1 to May 31
- Days at 70°F or more
- 1
- Sunshine
- 81%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USC00043714; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Half Moon Bay in May?
On a given May day the chance of 0.01 inch or more is 23% on average, highest around May 1 (24%). In all, 0.96 in falls on 7 days of a normal May.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USC00043714.
What are the records for May in Half Moon Bay?
The warmest May temperature on this station's record (since 1939) is 82°F, on May 6, 1949; the coldest is 33°F, on May 22, 2008. The wettest May brought 4.10 in (1957).
The May mean against the 1991-2020 normal of 54.9°F: 2021 52.6°F (−2.3), 2022 52.8°F (−2.1), 2023 54.7°F (−0.2), 2024 53.2°F (−1.7), 2025 54.4°F (−0.5), 2026 56.3°F (+1.4). 1 of 6 ran warmer than normal.
| May | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 52.6°F | −2.3°F | 0.14 in |
| 2022 | 52.8°F | −2.1°F | 0.19 in |
| 2023 | 54.7°F | −0.2°F | 1.92 in |
| 2024 | 53.2°F | −1.7°F | 1.36 in |
| 2025 | 54.4°F | −0.5°F | 0.33 in |
| 2026 | 56.3°F | +1.4°F | 0.59 in |
Source: records: ACIS, station USC00043714; recent months: ACIS, station USC00043714. Records and recent months use complete months only.
How does May in Half Moon Bay 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; Half Moon Bay's is 62°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.