Annual mean 11°C · wettest around September · prevailing wind NW
Warmest
17.5 °C
Coldest
8.7 °C
Wettest
38%
Windiest
8.4 m/s
Prevailing
NW
7.4 m/s average
When this place is good five ratings · thirty-six ten-day sections · click a cell to read it
never good
never good
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Every reading
bars actual · line feels-like, °Cchance of rain, %wind speed, m/ssky covered, %
The average temperature in Halfmoon Bay over the whole year is 11°C. January is the hottest month, with highs of about 17°C; August is the coldest, with lows of about 6°C. Halfmoon Bay has no sharply defined rainy season: the chance of rain on a given day runs from 19% in March, the driest month, to 28% in September, the wettest. Winds in Halfmoon Bay are highest in September, averaging 7.3 m/s (26 km/h), and lightest in June, at 6.0 m/s (22 km/h). The prevailing wind is from the NW. The clearest skies in Halfmoon Bay come in August, when the sky is typically 38% covered; December is the cloudiest month, at 52%.
Month by month Halfmoon Bay climate by month: average temperatures year round · click a month to read it
Month
High
Low
Feels like
Chance of rain
Cloud
Wind
Being outside
Sun
Walking
January
17°C
12°C
12°C
20%
48%
7.0 m/s
33
3
61
February
17°C
12°C
12°C
21%
44%
6.7 m/s
35
2
62
March
16°C
11°C
11°C
19%
47%
6.3 m/s
32
1
65
April
14°C
10°C
8°C
26%
42%
7.1 m/s
13
0
52
May
12°C
8°C
6°C
26%
40%
6.9 m/s
6
0
43
June
9°C
6°C
4°C
24%
48%
6.0 m/s
0
0
31
July
9°C
6°C
3°C
27%
42%
6.4 m/s
0
0
25
August
10°C
6°C
4°C
25%
38%
6.3 m/s
1
0
33
September
11°C
7°C
5°C
28%
39%
7.3 m/s
3
0
39
October
13°C
8°C
6°C
26%
42%
7.1 m/s
11
0
45
November
14°C
10°C
9°C
23%
46%
6.8 m/s
18
0
54
December
16°C
12°C
10°C
22%
52%
7.0 m/s
27
1
60
High and low are the warmest and coolest of four readings a day — midnight, 6am, noon and 6pm — so a true overnight low can sit a degree or two under them. Chance of rain, cloud and wind are the day’s average; feels-like and the three ratings (each out of 100: Good from 55, Ideal from 80) are read at midday.
Seasons, and the year in short Halfmoon Bay weather by season
Year round, Halfmoon Bay has days of about 9°C at their warmest in July, its coolest month, and 17°C in January, its warmest; the coolest hours of the day run from 6°C to 12°C through the year, and the average temperature over the year is 11°C around the clock. Rain is most likely around September and least likely around March. Every figure here is a decade of observations blended into one representative year, so it reads as what this date is usually like, not a forecast for one particular day.
Halfmoon Bay weather in winterJune to August
High 9°CLow 6°CRain 25%
Winter in Halfmoon Bay has typical daily highs of about 9°C and lows of about 6°C, with a 25% chance of rain on a given day.
Halfmoon Bay weather in springSeptember to November
High 13°CLow 8°CRain 26%
Spring in Halfmoon Bay has typical daily highs of about 13°C and lows of about 8°C, with a 26% chance of rain on a given day.
Halfmoon Bay weather in summerDecember to February
High 17°CLow 12°CRain 21%
Summer in Halfmoon Bay has typical daily highs of about 17°C and lows of about 12°C, with a 21% chance of rain on a given day.
Halfmoon Bay weather in autumnMarch to May
High 14°CLow 10°CRain 24%
Autumn in Halfmoon Bay has typical daily highs of about 14°C and lows of about 10°C, with a 24% chance of rain on a given day.
When is the rainy season in Halfmoon Bay?
Halfmoon Bay has no sharply defined rainy season: the chance of rain on a given day runs from 19% in March, the driest month, to 28% in September, the wettest.
What time of year is Halfmoon Bay windiest?
Winds in Halfmoon Bay are highest in September, averaging 7.3 m/s (26 km/h), and lightest in June, at 6.0 m/s (22 km/h). The prevailing wind is from the NW.
What is the average temperature in Halfmoon Bay year round?
The average temperature in Halfmoon Bay over the whole year is 11°C. January is the hottest month, with highs of about 17°C; August is the coldest, with lows of about 6°C.