Weather in Half Moon Bay

14-day forecast · updated today, Thursday, October 29, at 6:03 am (PDT)

Now · overcast 52 °F

Feels like: 47 °F
Low / high: 50 / 64 °F
Rain: 4%
Wind: 3 mph ESE

→ 29.93 inHg · steady

Today in Half Moon Bay: overcast, 50 °F to 64 °F, with a 4% chance of rain and a light air from the east-southeast (3 mph). Tomorrow, overcast, 52 °F to 60 °F and a 1% chance of rain. The warmest day of the week is Thursday 29, at 64 °F. No significant rain expected over the next 7 days.

Measured now at the airport

Half Moon Bay (KHAF), 5.2 mi away · 16 min ago

Visibility9.0 mi

WeatherNothing to note

Temperature48 °F

WindCalm

It's what the airport's weather station measured, not a forecast: on the coast, wind and fog can be different. Airports report every 30 or 60 minutes.

Airport METAR report, via NOAA's Aviation Weather Center (aviationweather.gov). Sources and licenses

Temperatures for the next 14 days

64° 50°
Today
60° 52°
Fri 30
60° 49°
Sat 31
59° 48°
Sun 1
63° 47°
Mon 2
64° 50°
Tue 3
62° 51°
Wed 4
62° 51°
Thu 5
61° 53°
Fri 6
62° 52°
Sat 7
62° 52°
Sun 8
68° 57°
Mon 9
66° 57°
Tue 10
65° 63°
Wed 11

Day by day

Day	Sky	Low / high	Rain	Max wind	Max wave	High tides	Model
Today · 29	Overcast	50 / 64 °F	4%	7 mph WSW	5.3 ft	2:12 am · 12:42 pm	HRRR
Fri 30	Overcast	52 / 60 °F	1%	8 mph WNW	4.8 ft	3:19 am · 1:36 pm	HRRR + NBM
Sat 31	Light drizzle	49 / 60 °F	28% · 0.02 in	6 mph WSW	4.1 ft	4:38 am · 2:39 pm	NBM
Sun 1	Light drizzle	48 / 59 °F	30%	9 mph NNW	5.9 ft	4:47 am · 2:58 pm	NBM
Mon 2	Overcast	47 / 63 °F	4%	4 mph N	6.6 ft	5:39 am · 4:29 pm	NBM
Tue 3	Overcast	50 / 64 °F	13%	5 mph N	6.6 ft	6:22 am · 5:52 pm	NBM
Wed 4	Light drizzle	51 / 62 °F	11%	6 mph SW	5.6 ft	7:00 am · 7:07 pm	NBM
Thu 5	Light drizzle	51 / 62 °F	19%	7 mph W	5.6 ft	7:34 am · 8:13 pm	NBM
Fri 6	Light drizzle	53 / 61 °F	20%	7 mph NW	11 ft	8:06 am · 9:08 pm	NBM
Sat 7	Partly cloudy	52 / 62 °F	8%	6 mph NNW	10 ft	8:36 am · 9:57 pm	NBM
Sun 8	Light drizzle	52 / 62 °F	13% · 0.04 in	5 mph NW	—	9:06 am · 10:46 pm	NBM + ECMWF
Mon 9	Light drizzle	57 / 68 °F	18% · 0.13 in	6 mph SE	—	9:34 am · 11:35 pm	ECMWF
Tue 10	Light drizzle	57 / 66 °F	18% · 0.00 in	11 mph S	—	10:04 am	ECMWF
Wed 11	Rain	63 / 65 °F	44% · 1.10 in	14 mph S	—	12:23 am · 10:34 am	ECMWF

Each hour comes from the best model for this spot: HRRR until Friday 30 1:00 am; then NBM until Sunday 8 11:00 pm; then ECMWF until Thursday 12 7:00 pm; then GFS.

Each day comes from the best model covering this spot: regional ones first (HRRR and NBM in the U.S., AROME, ICON-EU), then ECMWF; day 16, NOAA GFS. Waves: Météo-France up to day 10, then ECMWF WAM, coarser and further offshore. High tides: our own tide calculation.

Today, every 3 hours

Time	12:00 am	3:00 am	6:00 am	9:00 am	12:00 pm	3:00 pm	6:00 pm	9:00 pm
Sky	Overcast	Overcast	Overcast	Overcast	Overcast	Overcast	Overcast	Overcast
Temperature	52°	52°	52°	55°	64°	62°	60°	57°
Chance of rain	0%	0%	0%	1%	0%	1%	1%	1%
Rain	0.00 in	0.00 in	0.00 in	0.00 in	0.00 in	0.00 in	0.00 in	0.00 in
Wind (mph)	4 ENE	2 NE	3 SE	4 E	4 SW	4 WSW	7 W	5 W
Humidity	67%	52%	49%	44%	53%	68%	69%	69%
UV	0	0	0	0	3	2	0	0
Model	HRRR	HRRR	HRRR	HRRR	HRRR	HRRR	HRRR	HRRR

Do the models agree?

Low confidence

They don't agree on rain on Sunday 1: it may change, so check again closer to the day.

What 6 forecast models say for the next few days. The closer they are, the more reliable the forecast.

HighRainWind

Do the models agree? · High
High (°F)	Today	Fri 30	Sat 31	Sun 1	Mon 2	Tue 3	Wed 4
ECMWF	69°	66°	65°	64°	69°	70°	66°
AIFS	65°	65°	62°	62°	63°	63°	64°
GFS	69°	63°	61°	62°	67°	70°	65°
ICON	66°	64°	64°	62°	67°	70°	64°
HRRR	64°	64°	—	—	—	—	—
NBM	62°	60°	60°	59°	63°	64°	62°
Confidence	high	high	high	high	medium	medium	high

Do the models agree? · Rain
Rain	Today	Fri 30	Sat 31	Sun 1	Mon 2	Tue 3	Wed 4
ECMWF	0	0	0.01 in	0.04 in	0	0	0.07 in
AIFS	0	0	0.02 in	0	0	0.12 in	0
GFS	0	0	0.03 in	0.24 in	0	0	0
ICON	0	0	0	0.05 in	0	0	0
HRRR	0	0	—	—	—	—	—
NBM	0	0	0.02 in	0	0	0	0
Confidence	high	high	high	low	high	high	high

Do the models agree? · Wind
Wind (mph)	Today	Fri 30	Sat 31	Sun 1	Mon 2	Tue 3	Wed 4
ECMWF	513	921	716	921	516	312	1334
AIFS	3	6	4	8	4	7	6
GFS	67	911	119	813	66	54	89
ICON	717	615	1123	1022	616	412	819
HRRR	710	916	—	—	—	—	—
NBM	56	811	68	914	46	57	68
Confidence	high	high	high	high	high	high	high

Chance of rain from the ensemble models

Model	Today	Fri 30	Sat 31	Sun 1	Mon 2	Tue 3	Wed 4
ECMWF (51 scenarios)	0%	0%	33%	41%	0%	7%	13%
GFS (GEFS, 31 scenarios)	0%	0%	29%	30%	3%	6%	7%
NBM (NOAA)	4%	1%	28%	30%	4%	13%	11%
Thunderstorm (NBM)	0%	0%	4%	8%	0%	0%	2%

Each model's day runs midnight to midnight local time; models that reach fewer days are left blank. Rain: daily total. Wind: the day's highest average wind and, in small type, the strongest gust. Highlighted: values that stand out from the rest. The chance of rain comes from many runs of the same model with slightly different starting data.

Outlook

How the coming weeks and months compare with what is normal for the time of year. It is a trend, not a day-by-day forecast.

Next few weeks, compared with normal: much warmer, wetter and a much warmer sea.

Next 6 weeks

When	TemperatureTemp.	Rain	Sea	Typical high / low
Nov 2 – Nov 8Nov 2–Nov 8	Well above +5.9 °F	Normal	Well above +10.1 °F	—
Nov 9 – Nov 15Nov 9–Nov 15	Well above +7.4 °F	Well above +184%	Well above +11.0 °F	—
Nov 16 – Nov 22Nov 16–Nov 22	Well above +6.5 °F	Well above +121%	Well above +11.5 °F	63° / 57°
Nov 23 – Nov 29Nov 23–Nov 29	Well above +6.7 °F	Above +63%	Well above +12.2 °F	62° / 56°
Nov 30 – Dec 6Nov 30–Dec 6	Well above +6.1 °F	Above +68%	Well above +12.6 °F	61° / 55°

Coming months

When	TemperatureTemp.	Rain	Sea
November	Well above +6.7 °F	Well above +104%	Well above +13.0 °F
December	Well above +6.3 °F	Above +81%	Well above +12.4 °F
January	Well above +5.4 °F	Well above +159%	Well above +9.7 °F
February	Above +4.0 °F	Well above +123%	Well above +7.0 °F
March	Above +3.8 °F	Well above +120%	Well above +5.8 °F

Weeks: ECMWF 46-day (average of its scenarios), against the normal of the last 20 years for those dates. Months: ECMWF SEAS5. Rain: total against normal. The further ahead, the closer it gets to normal and the less detail it can give.

Half Moon Bay climate by monthClimate by month

Normal weather for each month (1991–2020 averages)

The best time to visit Half Moon Bay is from July to September: highs of 67 °F to 69 °F, barely 1 rainy day a month and 9 hours of sunshine a day.

59° 44°

JanJ
60° 44°

FebF
62° 45°

MarM
64° 46°

AprA
64° 48°

MayM
66° 50°

JunJ
67° 51°

JulJ
68° 52°

AugA
69° 51°

SepS
68° 49°

OctO
64° 45°

NovN
60° 43°

DecD

Highs and lows
Monthly rainfall
Best time

Month	High	Low	Rain	Rainy daysDays	Sun (h/day)	Water	Waves
JanuaryJan	59°	44°	5.07 in	9	3.4	54°	6.2 ft
FebruaryFeb	60°	44°	4.56 in	9	4.1	54°	6.1 ft
MarchMar	62°	45°	3.69 in	8	6.5	54°	5.8 ft
AprilApr	64°	46°	2.11 in	4	7.8	54°	5.7 ft
MayMay	64°	48°	0.80 in	3	8.5	54°	5.1 ft
JuneJun	66°	50°	0.29 in	1	10.2	55°	5.0 ft
JulyJul	67°	51°	0.13 in	0	9.5	57°	4.4 ft
AugustAug	68°	52°	0.10 in	0	9.1	59°	3.8 ft
SeptemberSep	69°	51°	0.17 in	1	8.6	59°	4.3 ft
OctoberOct	68°	49°	1.54 in	3	6.9	58°	4.8 ft
NovemberNov	64°	45°	2.89 in	6	5.3	56°	5.3 ft
DecemberDec	60°	43°	5.12 in	9	3.4	55°	6.1 ft

Month	Water	Waves
Jan	54°	6.2 ft
Feb	54°	6.1 ft
Mar	54°	5.8 ft
Apr	54°	5.7 ft
May	54°	5.1 ft
Jun	55°	5.0 ft
Jul	57°	4.4 ft
Aug	59°	3.8 ft
Sep	59°	4.3 ft
Oct	58°	4.8 ft
Nov	56°	5.3 ft
Dec	55°	6.1 ft

Days: rainy days in the month. Sun: hours a day.

A normal year brings 26.48 in of rain on about 51 days and about 2,550 hours of sunshine.

1991–2020 averages. Highs, lows and rainfall: TerraClimate; rainy days (0.04 in or more): NASA POWER (MERRA-2); sunshine hours: estimated from solar radiation; water: NOAA OISST; waves (average height): ERA5, 2011–2020. Normals are not a forecast: any given year can turn out very different. Sources and licenses

Temperature

Now52 °Ffeels like 47 °F

Tomorrow52 / 60 °F

It's 52 °F now (feels like 47 °F). Today, 50 °F to 64 °F; tomorrow, 52 °F to 60 °F.

Chance of rain

Today 4%
Fri 30 1%
Sat 31 28% 0.02 in
Sun 1 30%
Mon 2 4%
Tue 3 13%
Wed 4 11%

Today the chance of rain reaches 4%. No significant rain expected this week.

Recent rain: last 24 hours, 0.00 in; last 3 days, 0.00 in; last 7 days, 0.44 in.

Humidity and dew point

Humidity49%

Dew point33 °F

Humidity is 49% now and the dew point is 33 °F.

The dew point is the temperature at which the air becomes saturated: the higher it is, the heavier the air feels.

Visibility and fog

Now24 migood

Clouds100%

Visibility is good now (24 mi). No fog expected today.

The model gives visibility up to about 15 mi: beyond that, the horizon is clear.

UV index

Now0

Today's peak4moderate

Fri 30: 4 · Sat 31: 2 · Sun 1: 4

Index	Level	What to do
0–2	low	No special protection needed.
3–5	moderate	Hat, sunglasses and sunscreen around midday.
6–7	high	Sunscreen, hat and shade between 12 and 4 pm.
8–10	very high	Avoid the midday sun; reflection off the water adds to it.
11+	extreme	Avoid the sun between 11 am and 5 pm; protect yourself even if it is cloudy.

Reflection off water and sand adds radiation: protect yourself more on a boat or at the beach.

Barometric pressure

↗ Rising Anglers say fish bite less for a while
→ Steady · now Anglers expect normal activity
↘ Falling Anglers say fish feed more before the change

29.8029.9030.0030.10 29.86

Steady now (+0.00 inHg in 3 hours). It barely changes over the next 48 hours. Steady pressure: anglers expect normal activity. Fast changes, either way, tend to affect fishing.

Air and pollen

Air qualityModerate · 55

Saharan dustNo

Previous days

The weather over the last 30 days, as the models analyzed it. Tap a day to see it hour by hour.

Day	Sky	Low / high	Rain	Max wind
Wed 28	Overcast	48 / 67 °F	0	6 mph W
Tue 27	Partly cloudy	51 / 65 °F	0	8 mph W
Mon 26	Overcast	53 / 67 °F	0	9 mph W
Sun 25	Overcast	53 / 69 °F	0	6 mph W
Sat 24	Clear sky	53 / 69 °F	0	5 mph W
Fri 23	Overcast	56 / 67 °F	0	9 mph WNW
Thu 22	Light rain	56 / 63 °F	0.52 in	7 mph WSW

Show all 30 days

Day	Sky	Low / high	Rain	Max wind
Wed 21	Light drizzle	57 / 64 °F	0.05 in	7 mph SSW
Tue 20	Light drizzle	52 / 67 °F	0.02 in	4 mph WSW
Mon 19	Overcast	54 / 66 °F	0	9 mph W
Sun 18	Partly cloudy	54 / 71 °F	0	8 mph W
Sat 17	Clear sky	62 / 85 °F	0	8 mph WNW
Fri 16	Clear sky	61 / 87 °F	0	5 mph WNW
Thu 15	Clear sky	55 / 83 °F	0	7 mph W
Wed 14	Clear sky	52 / 75 °F	0	6 mph WNW
Tue 13	Mainly clear	51 / 71 °F	0	9 mph W
Mon 12	Clear sky	49 / 67 °F	0	7 mph WNW
Sun 11	Overcast	51 / 66 °F	0	11 mph SW
Sat 10	Partly cloudy	54 / 65 °F	0	11 mph WSW
Fri 9	Overcast	57 / 72 °F	0	7 mph W
Thu 8	Partly cloudy	59 / 83 °F	0	8 mph WNW
Wed 7	Clear sky	61 / 85 °F	0	6 mph WNW
Tue 6	Clear sky	60 / 87 °F	0	6 mph WNW
Mon 5	Clear sky	62 / 84 °F	0	6 mph NW
Sun 4	Partly cloudy	65 / 90 °F	0	7 mph WNW
Sat 3	Mainly clear	61 / 92 °F	0	5 mph WNW
Fri 2	Overcast	58 / 81 °F	0	3 mph NW
Thu 1	Overcast	56 / 78 °F	0	6 mph NW
Wed 30	Mainly clear	55 / 81 °F	0	7 mph WNW
Tue 29	Partly cloudy	53 / 82 °F	0	7 mph W

These are the models at the start of each day (ECMWF and GFS; waves from Météo-France), not readings from a weather station: there can be differences at specific spots.

Questions about the weather in Half Moon BayQuestions

What's the weather like today in Half Moon Bay?

Overcast, from 50 °F to 64 °F, with a light air from the east-southeast (3 mph) and a 4% chance of rain.

Will it rain tomorrow in Half Moon Bay?

On Friday 30 the chance of rain is 1% (0.00 in): overcast.

How warm will it be this week?

Between a low of 47 °F and a high of 64 °F; the warmest day, Thursday 29.

What's the UV index today?

It reaches 4 (moderate). Hat, sunglasses and sunscreen around midday.

Is the pressure rising or falling?

It's 29.93 inHg and steady: −0.06 inHg over the last 24 hours.

When is the best time to visit Half Moon Bay?

The best time to visit Half Moon Bay is from July to September: highs of 67 °F to 69 °F, barely 1 rainy day a month and 9 hours of sunshine a day.

What is the weather like in Half Moon Bay in October?

In October, Half Moon Bay normally sees highs of 68 °F and lows of 49 °F, with about 3 rainy days (1.54 in for the month) and 7 hours of sunshine a day. The sea is around 58 °F. These are 1991–2020 averages.

What are the warmest and wettest months in Half Moon Bay?

The warmest is September, with average highs of 69 °F, and the coldest December, with lows of 43 °F. The wettest is December (5.12 in) and the driest, August.

More about Half Moon Bay today

Weather near Half Moon Bay

Only places with a different forecast: spots a few miles apart share the same model cell and wouldn't add anything.

Learn more

Weather: Open-Meteo, CC BY 4.0, with the best model for each spot and lead time (NOAA HRRR and NBM in the U.S., Météo-France AROME, DWD ICON-EU, ECMWF IFS and NOAA GFS); ECMWF grid point 10 mi away. The comparison also uses ICON (DWD), AIFS (ECMWF) and ARPEGE (Météo-France). Outlook: ECMWF 46-day and SEAS5. Chance of rain from ensemble models (ECMWF, GEFS and NBM). UV, air quality and pollen: CAMS (Copernicus).

Forecast from Open-Meteo (CC BY 4.0) with models from ECMWF, NOAA, Météo-France, DWD, Copernicus Marine and CAMS. Updated at 6:03 am (local time).

Spotted a mistake? Tell us · Where the weather and sea data come from