Half Moon Bay in september: average Weather, Temperature and Climate
Weather in Half Moon Bay in september 2025
The weather in Half Moon Bay in the month of september comes from statistical datas on the last years. You can view the weather statistics for all the month, but also navigating through the tabs for the beginning, the middle and the end of the month.
Average weather throughout september
perfect weather
Weather at 6am
61°F
Clear/Sunny
58% of time
29%
6%
4%
Weather at 12pm
68°F
Clear/Sunny
85% of time
9%
4%
2%
Weather at 6pm
63°F
Clear/Sunny
74% of time
18%
4%
3%
Weather at 3am
61°F
63%
24%
7%
4%
Evolution of daily average temperature and precipitation in Half Moon Bay in september
These charts show the evolution of average minimum/maximum temperatures as well as average daily precipitation volume in Half Moon Bay in september.
The climate of Half Moon Bay in september is perfect
The climate in september in Half Moon Bay is dry ; it never rains.
The climate quite nice here this month. Temperatures are up to 70°F. On average, the recorded minimum temperature is 61°F. Thus, the mean temperature average on this month of september in Half Moon Bay is 65°F. Note that seasonal normals in contrast with those observed in Half Moon Bay in the month of september with a maximum record of 92°F in 2017 and a minimum record of 47°F in 2021. You can plan to have about 25 days with temperatures above 65°F, or 83% of time.
On this month of september, day length in Half Moon Bay is generally 12:25. Sunrise is at 05:52 and sets at 18:17.
With a perfect climate, september is advisable to go there in California.
Seasonal average climate and temperature of Half Moon Bay in september
Check below seasonal norms These statistics are generated from the weather statements earlier years of september.
| September | |||||
| Outside temperature | |||||
| Average temperature | 65°F | ||||
| Highest temperature | 70°F | ||||
| Lowest temperature | 61°F | ||||
| Highest record temperature | 92°F (2017) | ||||
| Lowest record temperature | 47°F (2021) | ||||
| Number of days at +65°F | 25 day(s) (83%) | ||||
| Sea temperature | |||||
| Average sea temperature | 58°F | ||||
| Lowest sea temperature | 56°F | ||||
| Highest sea temperature | 59°F | ||||
| Wind | |||||
| Wind speed | 19km/h | ||||
| Wind temperature | 61°F | ||||
| Precipitation (rainfall) | |||||
| Rainfall | 0.3in | ||||
| Number of days with rainfall | 0 day(s) (1%) | ||||
| Record daily rainfall | 0.7in (2013) | ||||
| Other climate data | |||||
| Humidity | 83% | ||||
| Visibility | 9.69km | ||||
| Cloud cover | 15% | ||||
| UV index | 5 | ||||
| Daily sunshine hours | 12 | ||||
| Sunrise and sunset | |||||
| Time of sunrise | 05:52 | ||||
| Time of sunset | 18:17 | ||||
| Length of day | 12:25 | ||||
| Our opinion about the weather in september | |||||
| Our opinion at whereandwhen.net | perfect | ||||
How was the weather last september?
Here is the day by day recorded weather in Half Moon Bay in september 2024:
56°F to 63°F
58°F to 65°F
58°F to 74°F
59°F to 72°F
61°F to 70°F
56°F to 65°F
58°F to 63°F
56°F to 65°F
54°F to 63°F
56°F to 61°F
56°F to 65°F
56°F to 65°F
56°F to 63°F
56°F to 63°F
58°F to 59°F
56°F to 61°F
56°F to 58°F
58°F to 59°F
54°F to 58°F
54°F to 59°F
54°F to 61°F
52°F to 61°F
54°F to 65°F
54°F to 63°F
54°F to 61°F
56°F to 59°F
54°F to 63°F
54°F to 59°F
56°F to 61°F
54°F to 68°F
Map: other cities in California in september
Cities near Half Moon Bay:
| Moss Beach in september | perfect weather |
| Pescadero in september | perfect weather |
| Silicon Valley in september | perfect weather |
| San Francisco in september | perfect weather |
| Oakland in september | perfect weather |
| Golden Gate National Recreation Area in september | perfect weather |
| San Jose in september | perfect weather |
| Stinson Beach in september | perfect weather |
| Santa Cruz California in september | perfect weather |
| Point Reyes in september | perfect weather |
| Pacific Grove in september | perfect weather |
| Napa Valley in september | perfect weather |
Click over cities on the map for information about the weather in september.
Half Moon Bay
perfect weather
good
tolerable
bad
very bad
Weather data for Half Moon Bay in september:
Weather data for Half Moon Bay for september are derived from an average of the weather forecast since 2009 in Half Moon Bay. There is a margin of error and these forecasts are to be considered as general information only. The weather in Half Moon Bay can vary slightly from year to year, but this data should limit surprises. So you can pack your bags or check for the best time in year to go to Half Moon Bay.