Costa Mesa, CA weather in October
Expect mild, dry weather in Costa Mesa in October, with highs near 79°F and lows near 59°F. Rain falls on about 2 days. Good for outdoor plans.
- Normal high
- 79°F
- Normal low
- 59°F
- Wet days
- 2
- 0.3 in total
- Muggy days
- 0
- dew point 65°F+
How October changes from start to finish
| October 1 | October 31 | |
|---|---|---|
| Normal high | 81°F | 78°F |
| Normal low | 62°F | 57°F |
| Chance of a wet day | 4% | 8% |
| Sunrise / sunset | 6:46 am / 6:36 pm | 7:09 am / 6:00 pm |
| Daylight | 11.8 h | 10.8 h |
Chance of a wet day: average for the first and last 7 days of the month. Times are local clock time (Pacific Time).
A typical October day
- 6 am62°Fdew point 53°F
- 9 am69°Fdew point 53°F
- Noon72°Fdew point 54°F
- 3 pm70°Fdew point 55°F
- 6 pm66°Fdew point 57°F
- 9 pm65°Fdew point 56°F
NOAA hourly normals (local standard time) from Los Angeles Intl Airport (34 mi away); average wind 7 mph; clear or few clouds in 50% of daytime hours, mostly cloudy or overcast in 29%.
What kind of days to expect
- Comfortable dayshigh 65-80°F and dew point under 60°F14 of 31
- Beach dayshigh 80-95°F, under 0.05 in of rain, afternoon wind under 15 mph14 of 31
- Hot dayshigh 90°F or more5 of 31
- Muggy daysdaily mean dew point 65°F or more0 of 31
- Wet daysat least 0.01 in of rain or melted snow2 of 31
- Notable rainat least 0.10 in1 of 31
- Freezing nightslow 32°F or below0 of 31
Average days per October, counted from daily records for each year 1991-2020.
Rain in October
Normal precipitation is 0.3 in; a dry October brings about 0.01 in and a wet one about 0.5 in (25th and 75th percentiles). Days with half an inch or more are rare.
How October varies from year to year
- Warmest October, 1991-20202008: average high 86°F
- Coolest October2002: average high 74°F
- Wettest October2004: 1.7 in
- Driest October1995: no measurable precipitation
- Highest reading106°F (October 9, 2015)
- Lowest reading45°F (October 25, 1997)
From the station's daily records with NOAA quality flags removed; most recent date shown when a reading repeats.
October compared with September and November
| September | October | November | |
|---|---|---|---|
| Normal high | 84°F | 79°F | 74°F |
| Normal low | 64°F | 59°F | 53°F |
| Wet days | 1 | 2 | 3 |
| Comfortable days | 6 | 14 | 20 |
| Daylight | 12.4 h | 11.3 h | 10.4 h |
Highs change by -5°F from September and -5°F into November.
Nearby alternatives in October
- Warmer: Corona, CA26 mi · high 85°F · 1 wet day
- Cooler: Torrance, CA28 mi · high 74°F · 2 wet days
How Costa Mesa ranks in October
- Normal high97th warmest of 378 cities; 24th of 60 in California
- Wet days15th driest of 378
- Comfortable days109th most of 340
What to pack for Costa Mesa in October
- A swimsuit – about 14 beach days
Heating and cooling
October has 12 heating degree days and 148 cooling degree days (base 65°F), 7% of the year's total heating and cooling demand.
Questions
How hot is Costa Mesa in October?
The normal high is 79°F and the normal low is 59°F. From 1991 to 2020 the hottest October reading was 106°F (October 9, 2015).
Does it rain a lot in Costa Mesa in October?
About 2 days in October have at least 0.01 in of precipitation, and the normal total is 0.3 in. The wettest October in 1991-2020 was in 2004 (1.7 in); the driest was in 1995, with no measurable precipitation.
Is October a good time to visit Costa Mesa?
October ranks 9th of 12 months on our comfort score for Costa Mesa (65 out of 100). It has about 14 comfortable days and about 5 days at 90°F or hotter. The best month is May.
Where the numbers come from
- Temperature: Santa Ana Fire Stn (USC00047888), 7.7 mi NNE of the city center, 135 ft . NOAA normals and daily records, 1991-2020.
- Rain, snowfall and snow depth: Newport Beach Harbor (USC00046175), 3.3 mi SE of the city center, 10 ft (90 ft lower than the city). NOAA normals and daily records, 1991-2020.
- Frost dates: Santa Ana John Wayne Airport (USW00093184), 4.0 mi NE of the city center, 54 ft . NOAA normals and daily records, 1991-2020.
- Humidity and wind by hour and cloud cover: Los Angeles Intl Airport (USW00023174), 34 mi NW of the city center, 97 ft . NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: J. Wayne Apt-Orange Co Apt (722977-93184), 4.0 mi NE of the city center, 43 ft (57 ft lower than the city). Hourly observations, 1991-2020.