Fairfield, CA weather in August
August in Fairfield: hot and dry. Highs 89°F, lows 58°F, rain is rare. This is the peak of the warm season in Fairfield.
- Normal high
- 89°F
- Normal low
- 58°F
- Wet days
- 0
- 0.03 in total
- Muggy days
- 0
- dew point 65°F+
How August changes from start to finish
| August 1 | August 31 | |
|---|---|---|
| Normal high | 89°F | 89°F |
| Normal low | 58°F | 58°F |
| Chance of a wet day | 1% | 1% |
| Sunrise / sunset | 6:10 am / 8:18 pm | 6:37 am / 7:39 pm |
| Daylight | 14.1 h | 13.1 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 August day
- 6 am59°Fdew point 54°F
- 9 am71°Fdew point 54°F
- Noon82°Fdew point 53°F
- 3 pm88°Fdew point 52°F
- 6 pm79°Fdew point 54°F
- 9 pm66°Fdew point 53°F
NOAA hourly normals (local standard time) from Travis AFB (6 mi away); average wind 17 mph; clear or few clouds in 91% of daytime hours, mostly cloudy or overcast in 5%.
What kind of days to expect
- Comfortable dayshigh 65-80°F and dew point under 60°F4 of 31
- Hot dayshigh 90°F or more15 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 August, counted from daily records for each year 1991-2020.
Rain in August
Normal precipitation is 0.03 in; a dry August 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 August varies from year to year
- Warmest August, 1991-20201998: average high 94°F
- Coolest August1991: average high 84°F
- Wettest August1997: 0.4 in
- Driest August1992: no measurable precipitation
- Highest reading111°F (August 5, 1998)
- Lowest reading41°F (August 29, 2011)
From the station's daily records with NOAA quality flags removed; most recent date shown when a reading repeats.
August compared with July and September
| July | August | September | |
|---|---|---|---|
| Normal high | 90°F | 89°F | 87°F |
| Normal low | 58°F | 58°F | 57°F |
| Wet days | 0 | 0 | 1 |
| Comfortable days | 4 | 4 | 6 |
| Daylight | 14.5 h | 13.6 h | 12.4 h |
Highs change by -1°F from July and -2°F into September.
Nearby alternatives in August
- Warmer: Stockton, CA45 mi · high 94°F · 0 wet days
- Cooler: Napa, CA14 mi · high 84°F · 0 wet days
How Fairfield ranks in August
- Normal high142nd warmest of 378 cities; 27th of 60 in California
- Wet days20th driest of 378
- Comfortable days147th most of 341
What to pack for Fairfield in August
- Light, breathable clothing – highs near 89°F
- Layers – afternoons near 89°F but nights near 58°F
Heating and cooling
August has 1 heating degree days and 268 cooling degree days (base 65°F), 8% of the year's total heating and cooling demand.
Questions
How hot is Fairfield in August?
The normal high is 89°F and the normal low is 58°F. From 1991 to 2020 the hottest August reading was 111°F (August 5, 1998).
Does it rain a lot in Fairfield in August?
About 0 days in August have at least 0.01 in of precipitation, and the normal total is 0.03 in. The wettest August in 1991-2020 was in 1997 (0.4 in); the driest was in 1992, with no measurable precipitation.
Is August a good time to visit Fairfield?
August ranks 10th of 12 months on our comfort score for Fairfield (52 out of 100). It has about 4 comfortable days and about 15 days at 90°F or hotter. The best months are April and May.
Where the numbers come from
- Temperature, rain, snowfall, snow depth and frost dates: Fairfield (USC00042934), 2.3 mi NW of the city center, 40 ft . NOAA normals and daily records, 1991-2020.
- Humidity and wind by hour and cloud cover: Travis AFB (USW00023202), 5.9 mi ENE of the city center, 59 ft . NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: Travis Air Force Base (745160-23202), 5.9 mi ENE of the city center, 62 ft . Hourly observations, 1991-2020.