Half Moon Bay Weather in September
With daytime temperatures of 22°C (72°F) and nighttime lows of 11°C (52°F), September in Half Moon Bay brings high temperatures during the day. The excellent weather makes it an appealing time to visit.
Rainfall in Half Moon Bay in September
Typically around 3 days of rainfall are expected, averaging 5.6 mm (0.2 in) for the month. Rain is scarce this month and when it does fall, it tends to be light. Unlikely to disrupt plans significantly.
Temperature in Half Moon Bay in September
September in Half Moon Bay is generally excellent, with days reaching 22°C (72°F) and nights settling around 11°C (52°F). This gives the month a fairly typical daily rhythm, with warmer afternoons and more comfortable nights. At 11°C (52°F) overnight, it can feel quite a bit cooler after dark. Worth packing something warmer for evenings, but the cooler temperatures are ideal for sleeping. On average, it has the peak temperatures of the year.
Sunshine in Half Moon Bay in September
There are approximately 270 hours of sunshine this month, resulting in mostly clear days.
Wind Speed in Half Moon Bay in September
Wind speeds average 5 m/s (10 knots) during September. At this speed, gentle to moderate breezes make small trees sway and the wind creates whitecaps on water bodies. Daily variations range from moderate winds to stronger breezes, creating excellent conditions for sailing, kite flying and wind sports.
Average water temperature in September
The water is 14°C (57°F) this month, cool enough to feel refreshing on a warm day, but cold enough that most people won't stay in for long without a wetsuit.Our weather planner can help you find worldwide destinations with pleasant weather during this period. May, June, July, August, September and October typically offer the best weather for Half Moon Bay.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United States of America, check out our Half Moon Bay's climate page.
Half Moon Bay Temperature in September
Min Temperature
11°C (52°F)
Max Temperature
22°C (72°F)
Water Temperature
14°C (57°F) *
Chance of Rain
10%
Precipitation
5.6 mm (0.2 in)
Rainy days
3 days
Humidity
73% *
Windspeed
5 m/s (10 knots) *
Sunshine
270 hours *
Percentage Sunshine
73% *
Best Places in the United States of America in September
Find out more about the weather in the United States of America and which places have the best travel conditions in this month. See all of the United States of America in September →
perfect weather
pleasant
tolerable
unpleasant
poor
What to Wear in Half Moon Bay in September
Comfortable temperatures call for an easy wardrobe in September. Pack summer basics like t-shirts and shorts, but include a light jacket for cooler moments. A pair of comfortable walking shoes is essential. Dry conditions mean you won't need to worry about rain protection. With water temperatures around 14°C (57°F), the water is quite cold for swimming. You can skip the swimwear unless you're particularly tough. And with plenty of sunshine hours, don’t forget sunglasses, sunscreen, and maybe a sun hat.What To Do in Half Moon Bay in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United States of America, check out our Half Moon Bay's climate page.
Temperature Rainfall Sunshine Humidity Wind Speed Water Temp
See the full Half Moon Bay climate overview or explore weather in the United States of America.
