Costa Mesa, CA weather in July
July in Costa Mesa: warm and dry. Highs 83°F, lows 65°F, rain on about 1 day. A good month for most outdoor plans.
- Normal high
- 83°F
- Normal low
- 65°F
- Wet days
- 1
- 0.02 in total
- Muggy days
- 2
- dew point 65°F+
How July changes from start to finish
| July 1 | July 31 | |
|---|---|---|
| Normal high | 81°F | 84°F |
| Normal low | 63°F | 65°F |
| Chance of a wet day | 1% | 2% |
| Sunrise / sunset | 5:45 am / 8:06 pm | 6:03 am / 7:52 pm |
| Daylight | 14.3 h | 13.8 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 July day
- 6 am66°Fdew point 61°F
- 9 am71°Fdew point 61°F
- Noon73°Fdew point 61°F
- 3 pm72°Fdew point 61°F
- 6 pm69°Fdew point 61°F
- 9 pm66°Fdew point 61°F
NOAA hourly normals (local standard time) from Los Angeles Intl Airport (34 mi away); average wind 8 mph; clear or few clouds in 48% of daytime hours, mostly cloudy or overcast in 23%.
What kind of days to expect
- Comfortable dayshigh 65-80°F and dew point under 60°F5 of 31
- Beach dayshigh 80-95°F, under 0.05 in of rain, afternoon wind under 15 mph23 of 31
- Hot dayshigh 90°F or more4 of 31
- Muggy daysdaily mean dew point 65°F or more2 of 31
- Wet daysat least 0.01 in of rain or melted snow1 of 31
- Notable rainat least 0.10 in0 of 31
- Freezing nightslow 32°F or below0 of 31
Average days per July, counted from daily records for each year 1991-2020.
Rain in July
Normal precipitation is 0.02 in; a dry July brings about 0.0 in and a wet one about 0.01 in (25th and 75th percentiles). Days with half an inch or more are rare.
How July varies from year to year
- Warmest July, 1991-20202006: average high 92°F
- Coolest July1991: average high 78°F
- Wettest July1992: 0.3 in
- Driest July1993: no measurable precipitation
- Highest reading114°F (July 6, 2018)
- Lowest reading50°F (July 1, 2005)
From the station's daily records with NOAA quality flags removed; most recent date shown when a reading repeats.
July compared with June and August
| June | July | August | |
|---|---|---|---|
| Normal high | 78°F | 83°F | 85°F |
| Normal low | 61°F | 65°F | 65°F |
| Wet days | 1 | 1 | 0 |
| Comfortable days | 19 | 5 | 3 |
| Daylight | 14.3 h | 14.1 h | 13.4 h |
Highs change by +5°F from June and +2°F into August.
Nearby alternatives in July
- Warmer: Corona, CA26 mi · high 94°F · 1 wet day
- Cooler: Torrance, CA28 mi · high 75°F · 1 wet day
How Costa Mesa ranks in July
- Normal high289th warmest of 378 cities; 37th of 60 in California
- Wet days33rd driest of 378
- Comfortable days104th most of 340
What to pack for Costa Mesa in July
- A swimsuit – about 23 beach days
- Sunglasses and sunscreen – about 14.1 hours of daylight and highs near 83°F
Heating and cooling
July has 0 heating degree days and 267 cooling degree days (base 65°F), 12% of the year's total heating and cooling demand.
Questions
How hot is Costa Mesa in July?
The normal high is 83°F and the normal low is 65°F. From 1991 to 2020 the hottest July reading was 114°F (July 6, 2018).
Does it rain a lot in Costa Mesa in July?
About 1 days in July have at least 0.01 in of precipitation, and the normal total is 0.02 in. The wettest July in 1991-2020 was in 1992 (0.3 in); the driest was in 1993, with no measurable precipitation.
Is July a good time to visit Costa Mesa?
July ranks 10th of 12 months on our comfort score for Costa Mesa (62 out of 100). It has about 5 comfortable days and about 4 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.