Annual mean 13°C · wettest around March · prevailing wind W
Warmest
19.1 °C
Coldest
12.9 °C
Wettest
86%
Windiest
5.5 m/s
Prevailing
W
4.5 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 Half Moon Bay over the whole year is 13°C. September is the hottest month, with highs of about 19°C; February is the coldest, with lows of about 8°C. The rainy (wet) season in Half Moon Bay runs from October to May, peaking in March with a 87% chance of rain on a given day. The dry season is June; June is the driest month, at 30%. Winds in Half Moon Bay are highest in March, averaging 3.7 m/s (13 km/h), and lightest in October, at 2.6 m/s (9 km/h). The prevailing wind is from the W. The clearest skies in Half Moon Bay come in November, when the sky is typically 42% covered; July is the cloudiest month, at 71%.
Month by month Half Moon 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
14°C
9°C
10°C
86%
54%
3.1 m/s
13
0
70
February
14°C
8°C
10°C
86%
43%
3.5 m/s
16
0
65
March
14°C
9°C
10°C
87%
55%
3.7 m/s
10
0
66
April
14°C
10°C
11°C
85%
53%
3.7 m/s
15
1
74
May
15°C
11°C
12°C
83%
61%
3.7 m/s
18
1
80
June
17°C
12°C
14°C
30%
57%
3.6 m/s
30
4
82
July
17°C
13°C
15°C
62%
71%
3.2 m/s
44
4
84
August
18°C
14°C
16°C
57%
70%
2.9 m/s
65
5
82
September
19°C
13°C
16°C
50%
57%
2.9 m/s
62
5
81
October
18°C
11°C
16°C
78%
46%
2.6 m/s
55
5
80
November
16°C
9°C
13°C
85%
42%
2.7 m/s
31
0
79
December
14°C
9°C
11°C
86%
46%
2.8 m/s
15
0
72
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 Half Moon Bay weather by season
Year round, Half Moon Bay has days of about 14°C at their warmest in January, its coolest month, and 19°C in September, its warmest; the coolest hours of the day run from 8°C to 14°C through the year, and the average temperature over the year is 13°C around the clock. Rain is most likely around March and least likely around June. 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.
Half Moon Bay weather in winterDecember to February
High 14°CLow 9°CRain 86%
Winter in Half Moon Bay has typical daily highs of about 14°C and lows of about 9°C, with a 86% chance of rain on a given day.
Half Moon Bay weather in springMarch to May
High 14°CLow 10°CRain 85%
Spring in Half Moon Bay has typical daily highs of about 14°C and lows of about 10°C, with a 85% chance of rain on a given day.
Half Moon Bay weather in summerJune to August
High 17°CLow 13°CRain 50%
Summer in Half Moon Bay has typical daily highs of about 17°C and lows of about 13°C, with a 50% chance of rain on a given day.
Half Moon Bay weather in autumnSeptember to November
High 18°CLow 11°CRain 71%
Autumn in Half Moon Bay has typical daily highs of about 18°C and lows of about 11°C, with a 71% chance of rain on a given day.
When is the rainy season in Half Moon Bay?
The rainy (wet) season in Half Moon Bay runs from October to May, peaking in March with a 87% chance of rain on a given day. The dry season is June; June is the driest month, at 30%.
What time of year is Half Moon Bay windiest?
Winds in Half Moon Bay are highest in March, averaging 3.7 m/s (13 km/h), and lightest in October, at 2.6 m/s (9 km/h). The prevailing wind is from the W.
What is the average temperature in Half Moon Bay year round?
The average temperature in Half Moon Bay over the whole year is 13°C. September is the hottest month, with highs of about 19°C; February is the coldest, with lows of about 8°C.