July is one of the cooler months of the year in Halfmoon Bay, with average highs near 9.2°C and lows around 6.9°C (mean 8.1°C). It is about average for rainfall, averaging 95 mm of rainfall and 85% relative humidity across the period.
July is one of the cooler months of the year in Halfmoon Bay. Across 45 years of records, the warmest July in Halfmoon Bay was 2025 — when the month averaged 9.6°C — while the coldest was 1995 at 5.6°C. Typical July days reach 9.2°C with nights near 6.9°C. The long-term trend is warming, about 0.3°C per decade.
July is about average for rainfall in Halfmoon Bay, averaging 95 mm of rainfall. The wettest July on record was 1995 with 186 mm, while the driest was 2024 at 52 mm.
Relative humidity in Halfmoon Bay during July averages 85%. The most humid July was 1983 at 88%, and the least humid was 2016 at 81%.
July receives about 1.2 kWh/m²/day of solar energy in Halfmoon Bay. The sunniest Julys were 1993, 2004 and 2010, among others at 1.4 kWh/m²/day, and the cloudiest was 1984 at 0.9.
Average wind speed in Halfmoon Bay during July is 4.3 m/s. The windiest July was 2011 at 5.5 m/s, while the calmest were 1991 and 2025 at 3.5 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 7.8°C | 7.6°C | 7.9°C | 8.4°C | 8.8°C | +1°C |
| Avg High | 9.0°C | 8.8°C | 9.0°C | 9.6°C | 9.9°C | +0.9°C |
| Avg Low | 6.7°C | 6.5°C | 6.7°C | 7.3°C | 7.7°C | +1°C |
| Avg Rain | 94 mm | 94 mm | 95 mm | 99 mm | 95 mm | +0 mm |
July temperatures in Halfmoon Bay have risen by about 1°C between 1981–1985 and 2021–2025.
July has ranged from a record low of 2.6°C (1995) to a record high of 14°C (2021).
Rainfall in July is about average for rainfall, averaging 95 mm, with a wettest year of 186 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, July — with days averaging 9.2°C and nights around 6.9°C (mean 8.1°C) and higher rainfall (95 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 🔥 | 10.7°C | 9.6°C | 8.4°C | 13.0°C | 6.1°C | 56 mm | 87% | 3.5 m/s | 1.2 |
| 2024 | 9.8°C | 8.7°C | 7.7°C | 13.5°C | 4.5°C | 52 mm | 87% | 4 m/s | 1.3 |
| 2023 | 10.2°C | 9.1°C | 7.9°C | 12.6°C | 5.2°C | 114 mm | 84% | 5.2 m/s | 1.2 |
| 2022 | 9.0°C | 8.1°C | 7.2°C | 13.3°C | 5.3°C | 153 mm | 84% | 4.9 m/s | 1.1 |
| 2021 | 10.1°C | 8.9°C | 7.7°C | 14.0°C | 5.5°C | 97 mm | 86% | 4.2 m/s | 1.1 |
| 2020 | 9.4°C | 8.4°C | 7.5°C | 12.2°C | 4.8°C | 97 mm | 86% | 4.3 m/s | 1.2 |
| 2019 | 10.1°C | 9.0°C | 8.0°C | 13.2°C | 4.8°C | 92 mm | 87% | 3.7 m/s | 1.1 |
| 2018 | 10.3°C | 9.2°C | 8.0°C | 13.4°C | 5.6°C | 99 mm | 84% | 4.8 m/s | 1.2 |
| 2017 | 9.2°C | 8.1°C | 7.0°C | 11.3°C | 4.8°C | 102 mm | 85% | 3.9 m/s | 1.3 |
| 2016 | 9.7°C | 8.4°C | 7.0°C | 13.2°C | 4.7°C | 111 mm | 81% | 5 m/s | 1.3 |
| 2015 | 9.0°C | 7.7°C | 6.4°C | 12.3°C | 3.7°C | 77 mm | 83% | 4.6 m/s | 1.3 |
| 2014 | 9.3°C | 8.3°C | 7.3°C | 13.4°C | 5.3°C | 96 mm | 84% | 4.4 m/s | 1.1 |
| 2013 | 10.7°C | 9.4°C | 8.2°C | 13.1°C | 5.2°C | 133 mm | 84% | 4.8 m/s | 1.2 |
| 2012 | 10.0°C | 8.8°C | 7.6°C | 12.2°C | 4.0°C | 85 mm | 86% | 4.1 m/s | 1.2 |
| 2011 | 8.7°C | 7.4°C | 6.2°C | 11.3°C | 2.6°C | 133 mm | 84% | 5.5 m/s | 1.2 |
| 2010 | 9.0°C | 8.1°C | 7.1°C | 11.3°C | 5.6°C | 65 mm | 87% | 3.7 m/s | 1.4 |
| 2009 | 8.5°C | 7.4°C | 6.2°C | 10.8°C | 3.1°C | 119 mm | 84% | 5.1 m/s | 1.2 |
| 2008 | 9.1°C | 8.0°C | 7.0°C | 12.7°C | 4.0°C | 111 mm | 87% | 4.4 m/s | 1.2 |
| 2007 | 7.9°C | 6.8°C | 5.6°C | 11.1°C | 3.3°C | 149 mm | 86% | 3.9 m/s | 1.2 |
| 2006 | 9.2°C | 8.0°C | 6.9°C | 11.9°C | 4.4°C | 101 mm | 83% | 4.7 m/s | 1.2 |
| 2005 | 9.6°C | 8.4°C | 7.3°C | 12.5°C | 4.3°C | 92 mm | 84% | 4.4 m/s | 1.3 |
| 2004 | 9.0°C | 7.9°C | 6.7°C | 10.5°C | 4.6°C | 77 mm | 84% | 4.1 m/s | 1.4 |
| 2003 | 9.1°C | 7.8°C | 6.6°C | 12.2°C | 3.0°C | 120 mm | 85% | 4.4 m/s | 1.2 |
| 2002 | 9.0°C | 7.9°C | 6.7°C | 12.7°C | 4.5°C | 62 mm | 86% | 4.3 m/s | 1.3 |
| 2001 | 9.0°C | 7.9°C | 6.9°C | 11.9°C | 4.4°C | 52 mm | 84% | 4.3 m/s | 1.3 |
| 2000 | 9.9°C | 8.6°C | 7.4°C | 12.5°C | 5.3°C | 64 mm | 84% | 3.6 m/s | 1.3 |
| 1999 | 9.5°C | 8.4°C | 7.3°C | 13.0°C | 4.0°C | 86 mm | 84% | 4.6 m/s | 1.2 |
| 1998 | 10.0°C | 8.8°C | 7.6°C | 13.4°C | 6.0°C | 73 mm | 83% | 4.5 m/s | 1.2 |
| 1997 | 9.2°C | 8.0°C | 6.8°C | 12.3°C | 4.6°C | 94 mm | 85% | 4.3 m/s | 1.2 |
| 1996 | 7.5°C | 6.5°C | 5.5°C | 9.7°C | 3.3°C | 70 mm | 85% | 3.8 m/s | 1.1 |
| 1995 ❄️ 🌧️ | 6.7°C | 5.6°C | 4.5°C | 9.7°C | 2.6°C | 186 mm | 84% | 4.7 m/s | 1.1 |
| 1994 | 8.5°C | 7.2°C | 6.0°C | 11.2°C | 3.3°C | 109 mm | 85% | 4.8 m/s | 1.3 |
| 1993 | 10.0°C | 8.9°C | 7.8°C | 12.4°C | 5.1°C | 83 mm | 85% | 4 m/s | 1.4 |
| 1992 | 9.0°C | 7.8°C | 6.5°C | 11.5°C | 3.3°C | 110 mm | 83% | 4.9 m/s | 1.2 |
| 1991 | 8.1°C | 6.9°C | 5.7°C | 11.0°C | 3.5°C | 59 mm | 85% | 3.5 m/s | 1.3 |
| 1990 | 9.2°C | 8.1°C | 7.0°C | 13.0°C | 4.1°C | 68 mm | 84% | 4.1 m/s | 1.3 |
| 1989 | 9.1°C | 8.0°C | 7.0°C | 11.8°C | 4.7°C | 65 mm | 85% | 4.1 m/s | 1.4 |
| 1988 | 9.0°C | 7.8°C | 6.5°C | 11.8°C | 4.0°C | 141 mm | 85% | 4.7 m/s | 1.2 |
| 1987 | 8.6°C | 7.4°C | 6.1°C | 11.0°C | 4.4°C | 97 mm | 86% | 4.5 m/s | 1.2 |
| 1986 | 9.0°C | 7.8°C | 6.5°C | 12.2°C | 3.4°C | 108 mm | 84% | 5.1 m/s | 1.2 |
| 1985 | 9.8°C | 8.7°C | 7.5°C | 13.0°C | 4.4°C | 98 mm | 85% | 4.3 m/s | 1.4 |
| 1984 | 9.2°C | 8.0°C | 6.8°C | 12.4°C | 3.7°C | 71 mm | 86% | 3.6 m/s | 0.9 |
| 1983 | 8.4°C | 7.4°C | 6.4°C | 11.2°C | 3.9°C | 78 mm | 88% | 3.8 m/s | — |
| 1982 | 8.6°C | 7.4°C | 6.2°C | 11.1°C | 4.4°C | 89 mm | 84% | 4.2 m/s | — |
| 1981 | 9.1°C | 8.1°C | 7.0°C | 12.7°C | 3.9°C | 103 mm | 86% | 3.8 m/s | — |
Actual recorded July data for each year, 1981–2025 — sourced from NASA POWER.
The average high in July is around 9.2°C with lows near 6.9°C (mean 8.1°C), based on 45 years of NASA POWER data.
July averages 95 mm of rainfall in Halfmoon Bay, about average for rainfall. The wettest on record was 186 mm in 1995.
The hottest July reached 14°C in 2021. The coldest dipped to 2.6°C in 1995.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average July temperatures have risen by about 1°C. Daytime highs moved from 9°C to 10°C and overnight lows from 6.8°C to 7.8°C over the same span.
July is one of the cooler months of the year in Halfmoon Bay and about average for rainfall, so plan for around 9.2°C daytime highs and 6.9°C at night.
Yes — July is the coldest month of the year in Halfmoon Bay, averaging 8.1°C.
For July in Halfmoon Bay, pack warm layers and a jacket for chilly mornings, with typical highs of 9.2°C and lows of 6.9°C. Bring an umbrella or light rain jacket too.
Relative humidity in July averages 85% — quite humid.
Average wind speed in July is 4.3 m/s. The windiest July on record averaged 5.5 m/s (2011).
The wettest July on record was 1995 with 186 mm. On average, July sees 95 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 July, 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 July specifically, along with year-by-year records and how the month has changed over the decades.
