June is one of the cooler months of the year in Halfmoon Bay, with average highs near 9.8°C and lows around 7.4°C (mean 8.6°C). It is about average for rainfall, averaging 103 mm of rainfall and 85% relative humidity across the period.
June is one of the cooler months of the year in Halfmoon Bay. Across 45 years of records, the warmest June in Halfmoon Bay was 2016 — when the month averaged 9.9°C — while the coldest was 1995 at 7.1°C. Typical June days reach 9.8°C with nights near 7.4°C. The long-term trend is warming, about 0.2°C per decade.
June is about average for rainfall in Halfmoon Bay, averaging 103 mm of rainfall. The wettest June on record was 1994 with 165 mm, while the driest was 2009 at 49 mm.
Relative humidity in Halfmoon Bay during June averages 85%. The most humid Junes were 1985 and 2023 at 88%, and the least humid was 2012 at 81%.
June receives about 1 kWh/m²/day of solar energy in Halfmoon Bay. The sunniest Junes were 1984 and 2006 at 1.2 kWh/m²/day, and the cloudiest was 2001 at 0.8.
Average wind speed in Halfmoon Bay during June is 4.4 m/s. The windiest June was 2015 at 5.9 m/s, while the calmest was 1982 at 3.1 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 8.4°C | 8.2°C | 8.6°C | 8.8°C | 9.2°C | +0.8°C |
| Avg High | 9.5°C | 9.3°C | 9.8°C | 10.0°C | 10.5°C | +1°C |
| Avg Low | 7.3°C | 7.1°C | 7.3°C | 7.7°C | 8.1°C | +0.8°C |
| Avg Rain | 106 mm | 103 mm | 126 mm | 85 mm | 92 mm | -13 mm |
June temperatures in Halfmoon Bay have risen by about 0.8°C between 1981–1985 and 2021–2025.
June has ranged from a record low of 2.9°C (1995) to a record high of 15.1°C (2023).
Rainfall in June is about average for rainfall, averaging 103 mm, with a wettest year of 165 mm.
A quieter season to visit Halfmoon Bay
If your dates are flexible, the more temperate months of February and March tend to be the most comfortable for visiting Halfmoon Bay. That said, June — with days averaging 9.8°C and nights around 7.4°C (mean 8.6°C) and higher rainfall (103 mm) — can still be rewarding for travellers who don't mind the cooler conditions, and often means fewer crowds.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 10.2°C | 9.0°C | 7.9°C | 14.2°C | 6.1°C | 91 mm | 84% | 4.4 m/s | 1.1 |
| 2024 | 10.0°C | 9.0°C | 8.0°C | 14.6°C | 5.9°C | 107 mm | 88% | 4 m/s | 1.1 |
| 2023 | 10.9°C | 9.7°C | 8.5°C | 15.1°C | 5.2°C | 77 mm | 88% | 3.2 m/s | 1.1 |
| 2022 | 10.5°C | 9.1°C | 7.8°C | 14.0°C | 5.5°C | 90 mm | 83% | 4.4 m/s | 1.1 |
| 2021 | 10.8°C | 9.5°C | 8.3°C | 14.4°C | 5.3°C | 122 mm | 86% | 4 m/s | 1.1 |
| 2020 | 10.4°C | 9.1°C | 7.8°C | 14.4°C | 5.9°C | 67 mm | 83% | 4.3 m/s | 1.1 |
| 2019 | 10.4°C | 9.4°C | 8.4°C | 12.7°C | 6.5°C | 81 mm | 85% | 4.7 m/s | 1.1 |
| 2018 | 9.5°C | 8.5°C | 7.5°C | 12.5°C | 5.3°C | 53 mm | 86% | 3.7 m/s | 1.1 |
| 2017 | 10.4°C | 9.2°C | 8.1°C | 13.0°C | 5.7°C | 76 mm | 84% | 4.4 m/s | 1.1 |
| 2016 🔥 | 11.0°C | 9.9°C | 8.8°C | 14.3°C | 6.1°C | 67 mm | 85% | 4.4 m/s | 1.1 |
| 2015 | 9.8°C | 8.3°C | 6.8°C | 14.8°C | 3.1°C | 114 mm | 81% | 5.9 m/s | 1 |
| 2014 | 10.9°C | 9.7°C | 8.6°C | 13.2°C | 6.0°C | 78 mm | 86% | 4.2 m/s | 1 |
| 2013 | 9.7°C | 8.7°C | 7.7°C | 13.6°C | 3.7°C | 125 mm | 85% | 4.4 m/s | 1 |
| 2012 | 9.3°C | 7.9°C | 6.6°C | 13.0°C | 4.6°C | 110 mm | 81% | 5.2 m/s | 1.1 |
| 2011 | 9.8°C | 8.6°C | 7.5°C | 12.0°C | 6.3°C | 70 mm | 86% | 3.9 m/s | 1 |
| 2010 | 9.2°C | 8.1°C | 7.1°C | 12.2°C | 4.4°C | 74 mm | 87% | 4.1 m/s | 1.1 |
| 2009 | 9.1°C | 8.0°C | 6.9°C | 11.8°C | 4.2°C | 49 mm | 84% | 4.1 m/s | 1.1 |
| 2008 | 10.4°C | 9.2°C | 7.9°C | 13.4°C | 4.1°C | 143 mm | 85% | 4.6 m/s | 1.1 |
| 2007 | 8.6°C | 7.4°C | 6.2°C | 13.3°C | 4.0°C | 134 mm | 83% | 4.8 m/s | 1 |
| 2006 | 9.1°C | 7.9°C | 6.6°C | 12.2°C | 4.5°C | 114 mm | 83% | 4.7 m/s | 1.2 |
| 2005 | 9.3°C | 8.0°C | 6.8°C | 11.4°C | 4.4°C | 115 mm | 84% | 4.5 m/s | 1.1 |
| 2004 | 10.0°C | 8.7°C | 7.3°C | 13.2°C | 5.4°C | 158 mm | 86% | 4.3 m/s | 1 |
| 2003 | 10.8°C | 9.5°C | 8.2°C | 13.9°C | 5.2°C | 131 mm | 85% | 4.7 m/s | 1.1 |
| 2002 | 10.0°C | 8.7°C | 7.4°C | 12.7°C | 3.9°C | 151 mm | 85% | 5.3 m/s | 1.1 |
| 2001 | 10.8°C | 9.5°C | 8.2°C | 14.8°C | 4.0°C | 139 mm | 85% | 4.8 m/s | 0.8 |
| 2000 | 10.2°C | 9.1°C | 7.9°C | 12.9°C | 5.6°C | 119 mm | 86% | 4.6 m/s | 0.9 |
| 1999 | 10.5°C | 9.4°C | 8.4°C | 13.1°C | 5.4°C | 102 mm | 84% | 5 m/s | 0.9 |
| 1998 | 10.0°C | 8.6°C | 7.2°C | 12.3°C | 5.3°C | 84 mm | 84% | 4.4 m/s | 1 |
| 1997 | 9.9°C | 9.0°C | 8.1°C | 12.4°C | 6.1°C | 73 mm | 87% | 4 m/s | 0.9 |
| 1996 | 8.9°C | 7.7°C | 6.5°C | 11.9°C | 3.6°C | 110 mm | 84% | 4.7 m/s | 0.9 |
| 1995 ❄️ | 8.2°C | 7.1°C | 6.1°C | 11.1°C | 2.9°C | 128 mm | 85% | 4.7 m/s | 1 |
| 1994 🌧️ | 8.4°C | 7.3°C | 6.2°C | 11.4°C | 4.2°C | 165 mm | 86% | 4.4 m/s | 1.1 |
| 1993 | 10.2°C | 9.0°C | 7.7°C | 13.9°C | 4.9°C | 129 mm | 83% | 5.3 m/s | 1 |
| 1992 | 8.5°C | 7.5°C | 6.4°C | 12.2°C | 3.1°C | 96 mm | 87% | 4.1 m/s | 1.1 |
| 1991 | 8.6°C | 7.4°C | 6.1°C | 11.9°C | 3.8°C | 82 mm | 83% | 4.2 m/s | 1.1 |
| 1990 | 10.1°C | 8.9°C | 7.8°C | 13.3°C | 4.5°C | 56 mm | 85% | 4.1 m/s | 1.1 |
| 1989 | 9.7°C | 8.5°C | 7.3°C | 13.7°C | 3.7°C | 137 mm | 83% | 4.5 m/s | 1 |
| 1988 | 9.4°C | 8.1°C | 6.8°C | 12.6°C | 4.0°C | 90 mm | 86% | 4.6 m/s | 1 |
| 1987 | 9.5°C | 8.4°C | 7.4°C | 13.1°C | 4.6°C | 121 mm | 84% | 5.3 m/s | 0.9 |
| 1986 | 9.2°C | 8.1°C | 7.0°C | 12.1°C | 4.0°C | 152 mm | 84% | 4.6 m/s | 1 |
| 1985 | 10.2°C | 9.2°C | 8.2°C | 12.2°C | 6.2°C | 99 mm | 88% | 3.7 m/s | 1.1 |
| 1984 | 10.2°C | 9.2°C | 8.1°C | 13.0°C | 3.2°C | 70 mm | 86% | 4.8 m/s | 1.2 |
| 1983 | 8.8°C | 7.8°C | 6.7°C | 11.3°C | 3.0°C | 101 mm | 86% | 4.6 m/s | — |
| 1982 | 9.2°C | 8.1°C | 7.0°C | 14.3°C | 4.4°C | 71 mm | 83% | 3.1 m/s | — |
| 1981 | 9.3°C | 8.2°C | 7.2°C | 12.0°C | 4.9°C | 110 mm | 86% | 3.9 m/s | — |
Actual recorded June data for each year, 1981–2025 — sourced from NASA POWER.
The average high in June is around 9.8°C with lows near 7.4°C (mean 8.6°C), based on 45 years of NASA POWER data.
June averages 103 mm of rainfall in Halfmoon Bay, about average for rainfall. The wettest on record was 165 mm in 1994.
The hottest June reached 15.1°C in 2023. The coldest dipped to 2.9°C in 1995.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average June temperatures have risen by about 0.8°C. Daytime highs moved from 9.5°C to 10.5°C and overnight lows from 7.4°C to 8.1°C over the same span.
June is one of the cooler months of the year in Halfmoon Bay and about average for rainfall, so plan for around 9.8°C daytime highs and 7.4°C at night.
Not quite — June is the 3rd coolest month in Halfmoon Bay, averaging 8.6°C.
For June in Halfmoon Bay, pack warm layers and a jacket for chilly mornings, with typical highs of 9.8°C and lows of 7.4°C. Bring an umbrella or light rain jacket too.
Relative humidity in June averages 85% — quite humid.
Average wind speed in June is 4.4 m/s. The windiest June on record averaged 5.9 m/s (2015).
The wettest June on record was 1994 with 165 mm. On average, June sees 103 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 June, 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 June specifically, along with year-by-year records and how the month has changed over the decades.
