Climate Overview
The climate in Half Moon Bay Airport is temperate. The average annual temperature is 14°C and approximately 579mm of precipitation falls per year. January is the wettest month, receiving around 146mm of rainfall. Half Moon Bay Airport is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: September, October, August. The coldest months are February, December, January, when temperatures can drop to 10°C.
Temperature
Half Moon Bay Airport has relatively stable temperatures year-round, staying within a 9°C range. September is the warmest month, though highs remain moderate at 19°C with a mean of 16°C. February is the coolest month, with minimum temperatures around 10°C and an average of 12°C. Daily temperature variation is modest, with an average difference of 4°C between highs and lows. The sharpest temperature change occurs between October and November, with a 2°C shift in average temperatures.
Precipitation
Half Moon Bay Airport is a relatively dry area, receiving approximately 579mm of precipitation annually, which averages out to around 48mm per month. The wettest month is January, averaging 146mm of rainfall. February and March also tend to see above-average precipitation. The driest month is July, with just 2mm. That's 144mm less than January, the wettest month. Rainfall is heavily concentrated in certain months, creating a distinct wet and dry season. Visitors should plan around these patterns, as the difference between peak and low months is dramatic.
Wind
Half Moon Bay Airport is relatively calm, with an average annual wind speed of 4km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is February, averaging 4km/h, though still comfortable for most outdoor activities. The calmest conditions occur in November, with average winds dropping to 3km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 1km/h between the calmest and windiest months.
Seasons
7 days until Summer
It is currently spring in Half Moon Bay Airport, which began on March 20, 2026. Half Moon Bay Airport is in the Northern Hemisphere, where spring begins in March, summer in June, autumn in September, and winter in December. The warmest period peaks in September at around 19°C, while the coldest stretch bottoms out in February near 10°C. Summer is next, beginning on June 21, 2026 — 7 days from now.
Spring
Temperatures range from 11 to 15°C. Precipitation is moderate at around 161mm for the season, averaging 54mm per month. Winds are generally light, averaging 4km/h. Light layers work well as temperatures warm through the season — a great time to be outdoors.
Summer
Temperatures range from 13 to 18°C. Precipitation is minimal, with only around 8mm for the entire season. Winds are generally light, averaging 4km/h. Comfortable clothing with a light layer for cooler evenings is all you need.
Autumn
Temperatures range from 12 to 19°C. Rainfall is relatively light, with around 80mm over the season and a monthly average of 27mm. Winds are generally light, averaging 3km/h. Layered clothing works best as temperatures gradually cool — enjoy the crisp air and changing scenery.
Winter
Temperatures range from 10 to 14°C. Rainfall is heavy, totalling around 330mm across the season with a monthly average of 110mm. Winds are generally light, averaging 4km/h. A light jacket or sweater is usually sufficient, though cooler evenings may call for an extra layer.
Best Time to Visit
The best time to visit Half Moon Bay Airport is during August, September and October, when the weather is most comfortable for travellers. During these months, average temperatures hover around 16°C with modest rainfall averaging 9mm per month. By contrast, February can be quite cold with temperatures dropping to 10°C. With minimal rainfall expected, you can pack light and plan outdoor activities with confidence.
Monthly Climate Data
The table below shows monthly climate averages for Half Moon Bay Airport based on historical weather data. Min and max temperatures represent typical overnight lows and afternoon highs for each month, shown in degrees Celsius (°C). Precipitation is measured in millimetres (mm) and indicates the average total rainfall per month. Wind speed is the average sustained speed in kilometres per hour (km/h). All values are based on averages from over 10 years of historical weather data. The current month is highlighted for quick reference.
