Half Moon Bay weather in April: Half Moon Bay, California: normal highs, lows, rain and records for April
Half Moon Bay in April has a normal high of 61°F and a normal low of 45°F, a daily mean of 53°F, holding near 61°F all month. Measurable precipitation falls on 9 days in a normal April, 1.81 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 16°C and low of 7°C, 46 mm of precipitation in April.
- 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 April?
The normal high is 61°F and the normal low 45°F, for a daily mean of 52.9°F. April is 0.8°F warmer than March and 2.0°F cooler than May. April is the 8th warmest month of the year in Half Moon Bay and the 6th wettest. From one year to the next April's mean temperature typically moves about 1.6°F either way (NOAA's standard deviation), so roughly two Aprils in three average between 51°F and 55°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 37%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| April 1 | 61°F | 44°F | 37% | 22% |
| April 8 | 61°F | 44°F | 35% | 19% |
| April 15 | 61°F | 45°F | 31% | 16% |
| April 22 | 61°F | 45°F | 27% | 13% |
| April 30 | 61°F | 46°F | 25% | 10% |
Every day of April: normal high, low and chance of precipitation (warmest afternoon April 4, coldest night April 1)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| April 1 | 61°F | 44°F | 37% | 22% | 12 h 30 min |
| April 2 | 61°F | 44°F | 37% | 21% | 12 h 40 min |
| April 3 | 61°F | 44°F | 37% | 21% | 12 h 40 min |
| April 4 | 61°F | 44°F | 36% | 21% | 12 h 40 min |
| April 5 | 61°F | 44°F | 36% | 20% | 12 h 40 min |
| April 6 | 61°F | 44°F | 35% | 20% | 12 h 50 min |
| April 7 | 61°F | 44°F | 35% | 20% | 12 h 50 min |
| April 8 | 61°F | 44°F | 35% | 19% | 12 h 50 min |
| April 9 | 61°F | 44°F | 34% | 19% | 12 h 50 min |
| April 10 | 61°F | 44°F | 34% | 18% | 13 h |
| April 11 | 61°F | 44°F | 33% | 18% | 13 h |
| April 12 | 61°F | 44°F | 33% | 18% | 13 h |
| April 13 | 61°F | 44°F | 32% | 17% | 13 h |
| April 14 | 61°F | 44°F | 32% | 17% | 13 h 10 min |
| April 15 | 61°F | 45°F | 31% | 16% | 13 h 10 min |
| April 16 | 61°F | 45°F | 31% | 16% | 13 h 10 min |
| April 17 | 61°F | 45°F | 30% | 15% | 13 h 10 min |
| April 18 | 61°F | 45°F | 30% | 15% | 13 h 10 min |
| April 19 | 61°F | 45°F | 29% | 14% | 13 h 20 min |
| April 20 | 61°F | 45°F | 28% | 14% | 13 h 20 min |
| April 21 | 61°F | 45°F | 28% | 13% | 13 h 20 min |
| April 22 | 61°F | 45°F | 27% | 13% | 13 h 20 min |
| April 23 | 61°F | 45°F | 27% | 12% | 13 h 30 min |
| April 24 | 61°F | 45°F | 27% | 12% | 13 h 30 min |
| April 25 | 61°F | 45°F | 26% | 12% | 13 h 30 min |
| April 26 | 61°F | 46°F | 26% | 11% | 13 h 30 min |
| April 27 | 61°F | 46°F | 25% | 11% | 13 h 30 min |
| April 28 | 61°F | 46°F | 25% | 11% | 13 h 40 min |
| April 29 | 61°F | 46°F | 25% | 10% | 13 h 40 min |
| April 30 | 61°F | 46°F | 25% | 10% | 13 h 40 min |
- Normal high
- 61°FApril average
- Normal low
- 45°FApril average
- Precipitation
- 1.81 inmonth total
- Days with precipitation
- 90.01 inch or more
- Daylight
- 12 h 30 min to 13 h 40 minApril 1 to April 30
- Days at 70°F or more
- 2
- Sunshine
- 82%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 April?
On a given April day the chance of 0.01 inch or more is 31% on average, highest around April 1 (37%). In all, 1.81 in falls on 9 days of a normal April.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USC00043714.
What are the records for April in Half Moon Bay?
The warmest April temperature on this station's record (since 1939) is 84°F, on April 1, 2000; the coldest is 31°F, on April 30, 2008. The wettest April brought 7.43 in (1967).
The April mean against the 1991-2020 normal of 52.9°F: 2021 51.9°F (−1.0), 2022 51.3°F (−1.6), 2023 50.3°F (−2.6), 2024 51.8°F (−1.1), 2025 52.5°F (−0.4), 2026 56.2°F (+3.3). 1 of 6 ran warmer than normal.
| April | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 51.9°F | −1.0°F | 0.06 in |
| 2022 | 51.3°F | −1.6°F | 1.84 in |
| 2023 | 50.3°F | −2.6°F | 0.40 in |
| 2024 | 51.8°F | −1.1°F | 1.43 in |
| 2025 | 52.5°F | −0.4°F | 0.92 in |
| 2026 | 56.2°F | +3.3°F | 5.37 in |
Source: records: ACIS, station USC00043714; recent months: ACIS, station USC00043714. Records and recent months use complete months only.
How does April in Half Moon Bay compare across California?
Across the 219 places PlainClimate covers in California, April normal highs run from 49°F in Tahoma to 87°F in Brawley; Half Moon Bay's is 61°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.