Weather in Costa Mesa

14-day forecast · updated today, Wednesday, October 28, at 7:46 pm (PDT)

Now · overcast 65 °F

Feels like: 66 °F
Low / high: 59 / 75 °F
Rain: 2%
Wind: 3 mph S

↗ 29.95 inHg · rising

Today in Costa Mesa: overcast, 59 °F to 75 °F, with a 2% chance of rain and a light air from the south (3 mph). Tomorrow, overcast, 63 °F to 72 °F and a 7% chance of rain. The warmest day of the week is Wednesday 28, at 75 °F.

Temperatures for the next 14 days

75° 59°
Today
72° 63°
Thu 29
71° 61°
Fri 30
69° 59°
Sat 31
71° 61°
Sun 1
74° 58°
Mon 2
74° 58°
Tue 3
73° 58°
Wed 4
72° 58°
Thu 5
71° 58°
Fri 6
71° 57°
Sat 7
75° 57°
Sun 8
78° 60°
Mon 9
80° 63°
Tue 10

Day by day

Day	Sky	Low / high	Rain	Max wind	Max wave	High tides	Model
Today · 28	Overcast	59 / 75 °F	2%	8 mph SSE	2.7 ft	10:55 am	HRRR
Thu 29	Overcast	63 / 72 °F	7% · 0.06 in	9 mph S	2.6 ft	12:55 am · 11:41 am	HRRR + NBM
Fri 30	Light drizzle	61 / 71 °F	25% · 0.04 in	8 mph S	2.9 ft	2:19 am · 12:36 pm	NBM
Sat 31	Light drizzle	59 / 69 °F	73% · 0.21 in	8 mph SSE	3.1 ft	3:59 am · 1:50 pm	NBM
Sun 1	Light drizzle	61 / 71 °F	84% · 0.80 in	9 mph NW	5.8 ft	4:18 am · 2:23 pm	NBM
Mon 2	Clear sky	58 / 74 °F	5%	6 mph N	5.6 ft	5:08 am · 3:57 pm	NBM
Tue 3	Mainly clear	58 / 74 °F	8%	6 mph NW	3.1 ft	5:45 am · 5:15 pm	NBM
Wed 4	Clear sky	58 / 73 °F	9%	8 mph WNW	2.6 ft	6:18 am · 6:19 pm	NBM
Thu 5	Clear sky	58 / 72 °F	12%	6 mph WSW	2.6 ft	6:47 am · 7:13 pm	NBM
Fri 6	Overcast	58 / 71 °F	15% · 0.02 in	7 mph W	6.2 ft	7:15 am · 8:03 pm	NBM
Sat 7	Partly cloudy	57 / 71 °F	10% · 0.00 in	7 mph NW	6.6 ft	7:41 am · 8:48 pm	NBM
Sun 8	Overcast	57 / 75 °F	7% · 0.02 in	5 mph NNW	4.6 ft	8:07 am · 9:32 pm	NBM + ECMWF
Mon 9	Overcast	60 / 78 °F	0%	4 mph W	4.7 ft	8:32 am · 10:15 pm	ECMWF
Tue 10	Overcast	63 / 80 °F	7%	4 mph WSW	4.5 ft	8:59 am · 11:01 pm	ECMWF

Each hour comes from the best model for this spot: HRRR until Thursday 29 2:00 pm; then NBM until Sunday 8 11:00 am; then ECMWF until Thursday 12 7:00 am; 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	Mainly clear	Clear sky	Mainly clear	Overcast	Mainly clear	Overcast
Temperature	61°	61°	60°	65°	74°	75°	69°	64°
Chance of rain	0%	0%	0%	0%	0%	0%	0%	0%
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)	5 E	4 ESE	4 E	2 NE	5 S	8 SSW	5 SW	3 SSE
Humidity	85%	86%	80%	78%	59%	58%	68%	74%
UV	0	0	0	1	5	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 Saturday 31: 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	Thu 29	Fri 30	Sat 31	Sun 1	Mon 2	Tue 3
ECMWF	74°	72°	70°	69°	71°	73°	74°
AIFS	72°	70°	70°	66°	67°	71°	75°
GFS	74°	71°	70°	71°	70°	80°	81°
ICON	72°	71°	71°	72°	70°	77°	80°
HRRR	75°	71°	—	—	—	—	—
NBM	73°	72°	71°	69°	71°	74°	74°
Confidence	high	high	high	high	high	medium	medium

Do the models agree? · Rain
Rain	Today	Thu 29	Fri 30	Sat 31	Sun 1	Mon 2	Tue 3
ECMWF	0	0	0.05 in	0.01 in	0.13 in	0	0
AIFS	0	0.02 in	0.07 in	0.47 in	0.59 in	0	0
GFS	0	0	0	0	0.09 in	0	0
ICON	0	0	0.03 in	0.47 in	1.95 in	0.01 in	0
HRRR	0	0.02 in	—	—	—	—	—
NBM	0	0.04 in	0.04 in	0.21 in	0.80 in	0	0
Confidence	high	high	medium	low	medium	high	high

Do the models agree? · Wind
Wind (mph)	Today	Thu 29	Fri 30	Sat 31	Sun 1	Mon 2	Tue 3
ECMWF	617	819	717	59	815	419	313
AIFS	6	7	6	3	8	6	7
GFS	99	99	99	69	714	910	99
ICON	612	816	917	1026	2039	716	511
HRRR	814	913	—	—	—	—	—
NBM	711	813	813	813	915	611	611
Confidence	high	high	high	high	high	high	high

Chance of rain from the ensemble models

Model	Today	Thu 29	Fri 30	Sat 31	Sun 1	Mon 2	Tue 3
ECMWF (51 scenarios)	0%	8%	27%	84%	80%	3%	8%
GFS (GEFS, 31 scenarios)	0%	0%	35%	39%	39%	0%	10%
NBM (NOAA)	2%	7%	25%	73%	84%	5%	5%
Thunderstorm (NBM)	0%	0%	2%	2%	4%	0%	0%

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	Above +5.2 °F	Normal	Well above +9.9 °F	—
Nov 9 – Nov 15Nov 9–Nov 15	Well above +6.8 °F	Well above +112%	Well above +10.8 °F	73° / 63°
Nov 16 – Nov 22Nov 16–Nov 22	Well above +5.4 °F	Well above +125%	Well above +11.2 °F	70° / 61°
Nov 23 – Nov 29Nov 23–Nov 29	Well above +5.6 °F	A bit above +34%	Well above +11.9 °F	69° / 59°
Nov 30 – Dec 6Nov 30–Dec 6	Above +5.2 °F	Normal	Well above +12.1 °F	68° / 57°

Coming months

When	TemperatureTemp.	Rain	Sea
November	Well above +7.2 °F	Well above +148%	Well above +13.1 °F
December	Well above +6.3 °F	Above +58%	Well above +13.0 °F
January	Well above +5.4 °F	Well above +163%	Well above +10.8 °F
February	Above +3.8 °F	Well above +147%	Well above +8.5 °F
March	Above +3.8 °F	Well above +141%	Well above +7.0 °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.

Costa Mesa climate by monthClimate by month

Normal weather for each month (1991–2020 averages)

The best time to visit Costa Mesa is from May to September: highs of 71 °F to 78 °F, barely 1 rainy day a month and 9 hours of sunshine a day.

67° 47°

JanJ
67° 49°

FebF
68° 50°

MarM
70° 52°

AprA
71° 56°

MayM
73° 60°

JunJ
76° 63°

JulJ
78° 64°

AugA
78° 62°

SepS
76° 58°

OctO
72° 51°

NovN
67° 47°

DecD

Highs and lows
Monthly rainfall
Best time

Month	High	Low	Rain	Rainy daysDays	Sun (h/day)	Water	Waves
JanuaryJan	67°	47°	2.27 in	5	5.6	59°	2.6 ft
FebruaryFeb	67°	49°	2.63 in	6	5.5	59°	2.8 ft
MarchMar	68°	50°	1.69 in	5	7.6	59°	3.0 ft
AprilApr	70°	52°	0.70 in	2	8.8	60°	3.2 ft
MayMay	71°	56°	0.21 in	1	8.5	63°	3.2 ft
JuneJun	73°	60°	0.09 in	0	9.1	65°	2.9 ft
JulyJul	76°	63°	0.02 in	0	9.4	68°	2.8 ft
AugustAug	78°	64°	0.05 in	0	9.8	69°	2.7 ft
SeptemberSep	78°	62°	0.17 in	1	8.6	69°	2.8 ft
OctoberOct	76°	58°	0.40 in	2	7.0	67°	2.7 ft
NovemberNov	72°	51°	0.80 in	2	6.7	64°	2.6 ft
DecemberDec	67°	47°	1.91 in	5	5.4	60°	2.6 ft

Month	Water	Waves
Jan	59°	2.6 ft
Feb	59°	2.8 ft
Mar	59°	3.0 ft
Apr	60°	3.2 ft
May	63°	3.2 ft
Jun	65°	2.9 ft
Jul	68°	2.8 ft
Aug	69°	2.7 ft
Sep	69°	2.8 ft
Oct	67°	2.7 ft
Nov	64°	2.6 ft
Dec	60°	2.6 ft

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

A normal year brings 10.93 in of rain on about 29 days and about 2,800 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

Now65 °Ffeels like 66 °F

Tomorrow63 / 72 °F

It's 65 °F now (feels like 66 °F). Today, 59 °F to 75 °F; tomorrow, 63 °F to 72 °F.

Chance of rain

Today 2%
Thu 29 7% 0.06 in
Fri 30 25% 0.04 in
Sat 31 73% 0.21 in
Sun 1 84% 0.80 in
Mon 2 5%
Tue 3 8%

Today the chance of rain reaches 2%. The next day with likely rain is Thursday 29: 7% and 0.06 in.

Recent rain: last 24 hours, 0.00 in; last 3 days, 0.00 in; last 7 days, 0.63 in.

Humidity and dew point

Humidity73%

Dew point56 °F

Humidity is 73% now and the dew point is 56 °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

Now13 migood

Clouds98%

Visibility is good now (13 mi). No fog expected today.

UV index

Now0

Today's peak5moderate

Thu 29: 3 · Fri 30: 4 · Sat 31: 3

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

29.8029.9030.00 29.84

Rising now (+0.04 inHg in 3 hours). Over the next 48 hours: −0.04 inHg. Rising pressure: anglers say fish bite less for a while. Fast changes, either way, tend to affect fishing.

Air and pollen

Air qualityGood · 43

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
Tue 27	Overcast	61 / 74 °F	0	8 mph SSE
Mon 26	Partly cloudy	61 / 78 °F	0	8 mph WSW
Sun 25	Overcast	59 / 78 °F	0	7 mph W
Sat 24	Clear sky	58 / 76 °F	0	5 mph WSW
Fri 23	Drizzle	61 / 71 °F	0.11 in	5 mph SE
Thu 22	Drizzle	60 / 69 °F	0.37 in	9 mph WSW
Wed 21	Rain	65 / 75 °F	0.99 in	13 mph SW

Show all 30 days

Day	Sky	Low / high	Rain	Max wind
Tue 20	Overcast	64 / 77 °F	0	6 mph S
Mon 19	Mainly clear	65 / 77 °F	0	6 mph SSW
Sun 18	Clear sky	68 / 81 °F	0	6 mph SW
Sat 17	Overcast	74 / 86 °F	0	6 mph SSW
Fri 16	Clear sky	74 / 94 °F	0	12 mph NE
Thu 15	Clear sky	62 / 87 °F	0	5 mph NW
Wed 14	Clear sky	58 / 79 °F	0	7 mph WNW
Tue 13	Overcast	58 / 71 °F	0	6 mph WNW
Mon 12	Drizzle	61 / 66 °F	0.21 in	7 mph SW
Sun 11	Light rain	64 / 70 °F	0.54 in	11 mph SSW
Sat 10	Drizzle	69 / 78 °F	0.14 in	6 mph S
Fri 9	Partly cloudy	68 / 81 °F	0	8 mph SW
Thu 8	Clear sky	71 / 85 °F	0	7 mph SW
Wed 7	Mainly clear	72 / 87 °F	0	6 mph SSW
Tue 6	Mainly clear	74 / 89 °F	0	6 mph SSW
Mon 5	Clear sky	76 / 96 °F	0	9 mph WSW
Sun 4	Clear sky	79 / 94 °F	0	6 mph WSW
Sat 3	Clear sky	75 / 95 °F	0	9 mph W
Fri 2	Partly cloudy	66 / 92 °F	0	7 mph SW
Thu 1	Mainly clear	65 / 81 °F	0	7 mph SW
Wed 30	Clear sky	69 / 77 °F	0	6 mph SSE
Tue 29	Clear sky	65 / 78 °F	0	8 mph S
Mon 28	Partly cloudy	70 / 78 °F	0	9 mph SSW

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 Costa MesaQuestions

What's the weather like today in Costa Mesa?

Overcast, from 59 °F to 75 °F, with a light air from the south (3 mph) and a 2% chance of rain.

Will it rain tomorrow in Costa Mesa?

On Thursday 29 the chance of rain is 7% (0.06 in): overcast.

How warm will it be this week?

Between a low of 58 °F and a high of 75 °F; the warmest day, Wednesday 28.

What's the UV index today?

It reaches 5 (moderate). Hat, sunglasses and sunscreen around midday.

Is the pressure rising or falling?

It's 29.95 inHg and rising: +0.01 inHg over the last 24 hours.

When is the best time to visit Costa Mesa?

The best time to visit Costa Mesa is from May to September: highs of 71 °F to 78 °F, barely 1 rainy day a month and 9 hours of sunshine a day.

What is the weather like in Costa Mesa in October?

In October, Costa Mesa normally sees highs of 76 °F and lows of 58 °F, with about 2 rainy days (0.40 in for the month) and 7 hours of sunshine a day. The sea is around 67 °F. These are 1991–2020 averages.

What are the warmest and wettest months in Costa Mesa?

The warmest is September, with average highs of 78 °F, and the coldest December, with lows of 47 °F. The wettest is February (2.63 in) and the driest, July.

More about Costa Mesa today

Weather near Costa Mesa

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 8.9 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 7:46 pm (local time).

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