March is one of the warmer months of the year in Halfmoon Bay, with average highs near 14.4°C and lows around 11°C (mean 12.7°C). It is about average for rainfall, averaging 102 mm of rainfall and 82% relative humidity across the period.
March is one of the warmer months of the year in Halfmoon Bay. Across 45 years of records, the warmest March in Halfmoon Bay was 2019 — when the month averaged 14.7°C — while the coldest were 1983 and 2006 at 11°C. Typical March days reach 14.4°C with nights near 11°C. The long-term trend is warming, about 0.2°C per decade.
March is about average for rainfall in Halfmoon Bay, averaging 102 mm of rainfall. The wettest March on record was 2010 with 200 mm, while the driest was 2022 at 34 mm.
Relative humidity in Halfmoon Bay during March averages 82%. The most humid March was 1984 at 87%, and the least humid was 1985 at 79%.
March receives about 3.7 kWh/m²/day of solar energy in Halfmoon Bay. The sunniest March was 2022 at 4.1 kWh/m²/day, and the cloudiest were 2004, 2005 and 2010, among others at 3.4.
Average wind speed in Halfmoon Bay during March is 4 m/s. The windiest March was 1992 at 6 m/s, while the calmest was 1991 at 2.8 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 12.5°C | 12.5°C | 12.5°C | 12.9°C | 13.2°C | +0.7°C |
| Avg High | 14.2°C | 14.1°C | 14.3°C | 14.7°C | 14.9°C | +0.7°C |
| Avg Low | 10.9°C | 10.9°C | 10.9°C | 11.2°C | 11.4°C | +0.5°C |
| Avg Rain | 107 mm | 100 mm | 106 mm | 99 mm | 93 mm | -15 mm |
March temperatures in Halfmoon Bay have risen by about 0.6°C between 1981–1985 and 2021–2025.
March has ranged from a record low of 6.4°C (1983) to a record high of 20.9°C (2009).
Rainfall in March is about average for rainfall, averaging 102 mm, with a wettest year of 200 mm.
One of the best times to visit Halfmoon Bay
March is one of the best times to visit Halfmoon Bay. Expect days averaging 14.4°C and nights around 11°C (mean 12.7°C) — warmer than Halfmoon Bay's yearly average — with higher rainfall (102 mm), so conditions are generally comfortable for sightseeing and outdoor plans.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 15.2°C | 13.5°C | 11.7°C | 18.9°C | 9.1°C | 103 mm | 81% | 3.4 m/s | 3.6 |
| 2024 | 13.3°C | 11.6°C | 9.8°C | 16.9°C | 7.1°C | 119 mm | 80% | 4.5 m/s | 3.6 |
| 2023 | 15.5°C | 13.8°C | 12.1°C | 20.2°C | 8.0°C | 132 mm | 79% | 4.3 m/s | 3.8 |
| 2022 | 16.2°C | 14.3°C | 12.5°C | 20.7°C | 9.3°C | 34 mm | 83% | 3.2 m/s | 4.1 |
| 2021 | 15.0°C | 13.3°C | 11.6°C | 18.9°C | 9.5°C | 81 mm | 83% | 3.4 m/s | 3.7 |
| 2020 | 14.4°C | 12.4°C | 10.5°C | 19.5°C | 7.8°C | 86 mm | 81% | 3.8 m/s | 3.6 |
| 2019 🔥 | 16.5°C | 14.7°C | 13.0°C | 20.0°C | 10.9°C | 79 mm | 82% | 3 m/s | 4 |
| 2018 | 15.6°C | 14.0°C | 12.4°C | 19.2°C | 9.0°C | 113 mm | 81% | 3.9 m/s | 3.6 |
| 2017 | 13.9°C | 12.3°C | 10.6°C | 17.5°C | 8.4°C | 62 mm | 82% | 3.6 m/s | 3.6 |
| 2016 | 14.9°C | 13.1°C | 11.3°C | 19.8°C | 8.0°C | 95 mm | 82% | 3.5 m/s | 3.6 |
| 2015 | 14.4°C | 12.6°C | 10.7°C | 19.0°C | 8.6°C | 81 mm | 81% | 3.1 m/s | 3.5 |
| 2014 | 14.1°C | 12.6°C | 11.1°C | 16.8°C | 7.8°C | 64 mm | 84% | 3.6 m/s | 3.6 |
| 2013 | 15.4°C | 13.4°C | 11.5°C | 20.1°C | 8.6°C | 66 mm | 82% | 3.3 m/s | 3.7 |
| 2012 | 13.6°C | 11.8°C | 10.0°C | 17.1°C | 7.5°C | 111 mm | 80% | 3.5 m/s | 3.8 |
| 2011 | 14.2°C | 12.4°C | 10.6°C | 18.9°C | 8.0°C | 124 mm | 82% | 4.1 m/s | 3.8 |
| 2010 🌧️ | 14.1°C | 12.4°C | 10.8°C | 18.6°C | 7.5°C | 200 mm | 83% | 4.9 m/s | 3.4 |
| 2009 | 14.2°C | 12.5°C | 10.8°C | 20.9°C | 6.9°C | 108 mm | 82% | 4.2 m/s | 3.6 |
| 2008 | 15.0°C | 13.1°C | 11.3°C | 18.9°C | 9.0°C | 125 mm | 82% | 4 m/s | 3.7 |
| 2007 | 15.0°C | 13.0°C | 11.0°C | 19.2°C | 7.4°C | 164 mm | 85% | 4 m/s | 3.5 |
| 2006 | 12.5°C | 11.0°C | 9.4°C | 17.3°C | 7.6°C | 122 mm | 81% | 4.3 m/s | 3.5 |
| 2005 | 14.1°C | 12.6°C | 11.2°C | 18.3°C | 8.4°C | 95 mm | 85% | 4 m/s | 3.4 |
| 2004 | 13.3°C | 11.8°C | 10.3°C | 18.5°C | 7.7°C | 117 mm | 83% | 4.2 m/s | 3.4 |
| 2003 | 14.7°C | 12.9°C | 11.2°C | 19.6°C | 9.2°C | 62 mm | 85% | 3.2 m/s | 3.9 |
| 2002 | 14.0°C | 12.5°C | 11.0°C | 17.5°C | 6.9°C | 109 mm | 80% | 5 m/s | 3.6 |
| 2001 | 15.2°C | 13.2°C | 11.3°C | 20.5°C | 7.8°C | 72 mm | 80% | 3.6 m/s | 3.7 |
| 2000 | 14.7°C | 12.8°C | 11.0°C | 18.0°C | 7.9°C | 89 mm | 82% | 4 m/s | 3.7 |
| 1999 | 16.1°C | 14.3°C | 12.5°C | 20.7°C | 9.1°C | 132 mm | 83% | 4.2 m/s | 3.6 |
| 1998 | 14.6°C | 12.6°C | 10.6°C | 18.6°C | 7.6°C | 177 mm | 82% | 4.9 m/s | 3.4 |
| 1997 | 13.3°C | 11.8°C | 10.3°C | 16.3°C | 8.7°C | 71 mm | 81% | 4.3 m/s | 3.8 |
| 1996 | 14.0°C | 12.4°C | 10.8°C | 17.1°C | 8.6°C | 84 mm | 81% | 3.4 m/s | 3.5 |
| 1995 | 13.5°C | 11.9°C | 10.4°C | 17.3°C | 8.1°C | 155 mm | 82% | 4.6 m/s | 3.9 |
| 1994 | 13.7°C | 12.2°C | 10.7°C | 17.5°C | 7.8°C | 77 mm | 81% | 4.1 m/s | 3.5 |
| 1993 | 13.2°C | 11.7°C | 10.2°C | 17.8°C | 7.4°C | 99 mm | 81% | 4.1 m/s | 3.6 |
| 1992 | 12.5°C | 11.2°C | 9.8°C | 15.9°C | 7.0°C | 94 mm | 79% | 6 m/s | 3.7 |
| 1991 | 14.9°C | 13.3°C | 11.6°C | 17.5°C | 9.4°C | 54 mm | 85% | 2.8 m/s | 3.9 |
| 1990 | 14.7°C | 13.1°C | 11.6°C | 17.6°C | 7.9°C | 58 mm | 79% | 4.4 m/s | 3.8 |
| 1989 | 13.9°C | 12.4°C | 10.8°C | 17.7°C | 8.0°C | 169 mm | 81% | 4.8 m/s | 3.5 |
| 1988 | 13.1°C | 11.4°C | 9.7°C | 18.7°C | 7.2°C | 78 mm | 80% | 4.6 m/s | 3.7 |
| 1987 | 13.8°C | 12.2°C | 10.7°C | 17.9°C | 8.0°C | 137 mm | 84% | 3.4 m/s | 3.6 |
| 1986 | 14.9°C | 13.1°C | 11.4°C | 18.9°C | 8.8°C | 95 mm | 81% | 3.9 m/s | 3.9 |
| 1985 | 14.4°C | 12.8°C | 11.1°C | 19.5°C | 9.1°C | 55 mm | 79% | 3.6 m/s | 3.8 |
| 1984 | 15.0°C | 13.5°C | 12.0°C | 17.0°C | 9.5°C | 136 mm | 87% | 3.1 m/s | 3.4 |
| 1983 ❄️ | 12.6°C | 11.0°C | 9.3°C | 17.8°C | 6.4°C | 140 mm | 80% | 5.1 m/s | — |
| 1982 | 14.9°C | 13.3°C | 11.6°C | 19.5°C | 8.5°C | 51 mm | 83% | 3.4 m/s | — |
| 1981 | 14.9°C | 13.1°C | 11.3°C | 18.7°C | 7.3°C | 103 mm | 83% | 3.5 m/s | — |
Actual recorded March data for each year, 1981–2025 — sourced from NASA POWER.
The average high in March is around 14.4°C with lows near 11°C (mean 12.7°C), based on 45 years of NASA POWER data.
March averages 102 mm of rainfall in Halfmoon Bay, about average for rainfall. The wettest on record was 200 mm in 2010.
The hottest March reached 20.9°C in 2009. The coldest dipped to 6.4°C in 1983.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average March temperatures have risen by about 0.6°C. Daytime highs moved from 14.4°C to 15°C and overnight lows from 11.1°C to 11.5°C over the same span.
March is one of the warmer months of the year in Halfmoon Bay and about average for rainfall, so plan for around 14.4°C daytime highs and 11°C at night.
Not quite — March is the 10th coolest month in Halfmoon Bay, averaging 12.7°C.
For March in Halfmoon Bay, pack light layers you can adjust through the day, with typical highs of 14.4°C and lows of 11°C. Bring an umbrella or light rain jacket too.
Relative humidity in March averages 82% — quite humid.
Average wind speed in March is 4 m/s. The windiest March on record averaged 6 m/s (1992).
The wettest March on record was 2010 with 200 mm. On average, March sees 102 mm.
All figures are derived from NASA POWER (Prediction Of Worldwide Energy Resources), based on MERRA-2 satellite reanalysis, covering 1981–2025.
Explore how the weather in Halfmoon Bay behaves each March, based on 45 years of NASA POWER climate data from 1981 to 2025. This page breaks down average temperatures, rainfall, humidity, wind and solar radiation for March specifically, along with year-by-year records and how the month has changed over the decades.
