San Mateo, CA weather in July
July in San Mateo: mild and dry. Highs 73°F, lows 55°F, rain is rare. A great month for outdoor plans.
- Normal high
- 73°F
- Normal low
- 55°F
- Wet days
- 0
- 0.0 in total
- Muggy days
- 0
- dew point 65°F+
How July changes from start to finish
| July 1 | July 31 | |
|---|---|---|
| Normal high | 73°F | 73°F |
| Normal low | 54°F | 56°F |
| Chance of a wet day | 1% | 1% |
| Sunrise / sunset | 5:51 am / 8:34 pm | 6:12 am / 8:18 pm |
| Daylight | 14.7 h | 14.1 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 am57°Fdew point 53°F
- 9 am63°Fdew point 54°F
- Noon69°Fdew point 54°F
- 3 pm69°Fdew point 54°F
- 6 pm64°Fdew point 53°F
- 9 pm59°Fdew point 53°F
NOAA hourly normals (local standard time) from San Francisco Intl Airport (5 mi away); average wind 13 mph; clear or few clouds in 65% of daytime hours, mostly cloudy or overcast in 17%.
What kind of days to expect
- Comfortable dayshigh 65-80°F and dew point under 60°F28 of 31
- Beach dayshigh 80-95°F, under 0.05 in of rain, afternoon wind under 15 mph1 of 31
- Hot dayshigh 90°F or more0 of 31
- Muggy daysdaily mean dew point 65°F or more0 of 31
- Wet daysat least 0.01 in of rain or melted snow0 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 0.0 in; a dry July brings about 0.0 in and a wet one about 0.0 in (25th and 75th percentiles). Days with half an inch or more are rare.
How July varies from year to year
- Warmest July, 1991-20202014: average high 75°F
- Coolest July2000: average high 68°F
- Wettest July2007: 0.01 in
- Driest July1991: no measurable precipitation
- Highest reading97°F (July 22, 2006)
- Lowest reading48°F (July 11, 1998)
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 | 72°F | 73°F | 73°F |
| Normal low | 54°F | 55°F | 56°F |
| Wet days | 1 | 0 | 0 |
| Comfortable days | 23 | 28 | 27 |
| Daylight | 14.7 h | 14.5 h | 13.6 h |
Highs change by +1°F from June and 0°F into August.
Nearby alternatives in July
- Warmer: San Jose, CA28 mi · high 81°F · 0 wet days
- Cooler: San Francisco, CA16 mi · high 66°F · 1 wet day
How San Mateo ranks in July
- Normal high363rd warmest of 378 cities; 56th of 60 in California
- Wet days6th driest of 378
- Comfortable days4th most of 340
Heating and cooling
July has 58 heating degree days and 26 cooling degree days (base 65°F), 3% of the year's total heating and cooling demand.
Questions
How hot is San Mateo in July?
The normal high is 73°F and the normal low is 55°F. From 1991 to 2020 the hottest July reading was 97°F (most recently on July 22, 2006).
Does it rain a lot in San Mateo in July?
About 0 days in July have at least 0.01 in of precipitation, and the normal total is 0.00 in. The wettest July in 1991-2020 was in 2007 (0.01 in); the driest was in 1991, with no measurable precipitation.
Is July a good time to visit San Mateo?
July ranks 1st of 12 months on our comfort score for San Mateo (94 out of 100). It has about 28 comfortable days. The best months are July and August.
Where the numbers come from
- Temperature, rain, frost dates, humidity and wind by hour and cloud cover: San Francisco Intl Airport (USW00023234), 4.5 mi NNW of the city center, 8 ft . NOAA normals and daily records, 1991-2020.
- Snowfall and snow depth: Redwood City (USC00047339), 7.6 mi SE of the city center, 31 ft . NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: San Francisco International Airport (724940-23234), 4.5 mi NNW of the city center, 10 ft . Hourly observations, 1991-2020.