Temperatures in September
It's pleasantly warm in September in Half Moon Bay with an average temperature of 20°C. Temperatures this month range from a low of 18°C to a high of 23°C. At night, you can expect temperatures between 11°C and 15°C.
Max and Min Temperatures per Day
This chart shows the daily maximum and minimum temperatures in degrees Celsius for Half Moon Bay in September. The red line indicates the max temperatures, and the blue line shows the minimums.
Start of September
The month of September starts in Half Moon Bay with mild temperatures, averaging around 21°C during the day and nights close to 14°C. You won’t see any precipitation in the first days of the month, it’s all sunny skies.
Mid-September
By mid-September, the average daytime temperature drops to around 20°C, with nights close to 14°C. Not much precipitation expected during this period. It’s mostly dry with sunshine.
End of September
By the end of September, the average daytime temperature in Half Moon Bay will be around 20°C, with nights close to 13°C. Barely any chance of precipitation. The weather will mostly be dry with lots of sunshine.
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Precipitation in September
According to weather history, there is only 2,7 mm of precipitation in September. The wind speed is around 4 Bft, mostly coming from the West.
The average chance of precipitation is only 3% in September.
Precipitation Chance
This chart shows the daily precipitation chance (in percentages) in September for Half Moon Bay. 0% means it never rained on that day in the past 10 years, and 100% means it rained every day. All values in between represent the average chance of precipitation on that day.
Half Moon Bay in September |
London | ||
|---|---|---|---|
 Average Temperature |
20°C | 20°C | |
 High Temp |
23°C | 22°C | |
| Low Temp |
18°C | 17°C | |
 Total Precipitation |
2,7 mm | 44 mm | |
| Rainy Days |
1 day | 8 days | |
August
UV index
The UV index is a maximum of 7 this month. That's a moderate to high value on the intensity scale of 1 to 11. Unprotected skin can burn within 15-25 minutes.
Is September a good time to visit Half Moon Bay?
Want nice weather? Then September is a great time to be in Half Moon Bay. You’ll have pleasant temperatures and little chance of rain this month.
Temperature records for Half Moon Bay in September
With 38°C, Half Moon Bay hit the highest temperature in the last 10 years in September 2017. The lowest daytime temperature in this month was 14°C in 2018. The extreme night temperatures ranged from a low of 6°C to a high of 23°C.
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Daily Temperature in September in Half Moon Bay
This chart shows the average daily temperatures, both day and night, for each day in September in Half Moon Bay, measured in degrees Celsius. The red line represents the maximum temperatures, while the blue line shows the minimums. The days of the month are displayed at the bottom of the chart. The data, based on historical observations, gives an overview of the average daily temperatures during this month.
Daily Precipitation in September in Half Moon Bay
The chart below shows the average daily precipitation in September for Half Moon Bay, measured in millimetres over the past years. Precipitation is always measured as water, even if it’s snow or hail. The days of the month are shown at the bottom of the chart.
A low average precipitation means that the chance of rain on that day is usually small, while a higher average suggests that rain is more likely. But it’s still an average, so each day can be different. Based on historical weather data for September, you can expect about 1 day of rain in Half Moon Bay.
Daily UV Index in September in Half Moon Bay
This chart shows the average daily UV index in September in Half Moon Bay, with the UV index ranging from 0 to a maximum of 11. The bottom of the chart shows the days of the month. Based on historical data, this chart provides an idea of the daily UV radiation levels you can expect.
Temperature in September in Half Moon Bay Over the Years
This chart shows the average temperature in September in Half Moon Bay, measured in degrees Celsius, over the past years.
Total Precipitation in September in Half Moon Bay Over the Years
This chart shows the average precipitation in September in Half Moon Bay, measured in millimetres over the past years. Precipitation is always measured as water, even if it’s snow or hail.
Daily climate in September for Half Moon Bay
Click on a specific day in September for detailed info on the typical weather on that day in Half Moon Bay. Check out the historical temperatures and precipitation over the past 10 years on this day.
Weather experiences in September in Half Moon Bay
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Average Weather in Half Moon Bay by Month
Click on a month below to see detailed weather info for Half Moon Bay. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.
Or check out the climate of Half Moon Bay for all months at once
