San Jose weather in August: San Jose, California: normal highs, lows, rain and records for August
San Jose in August has a normal high of 81°F and a normal low of 59°F, a daily mean of 70°F, holding near 81°F all month. Measurable precipitation falls on 0 days in a normal August, 0.05 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 27°C and low of 15°C, 1 mm of precipitation in August.
- NOAA stationSan Jose
- Station IDUSW00023293
- Location37.36°N 121.92°W
- Elevation51 ft (16 m)
- From the center7 miles
- Population997,368
- Jan 60° 42°
- Feb 62° 44°
- Mar 66° 46°
- Apr 69° 48°
- May 74° 52°
- Jun 79° 56°
- Jul 81° 58°
- Aug 81° 59°
- Sep 81° 57°
- Oct 76° 53°
- Nov 66° 46°
- Dec 60° 42°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is San Jose in August?
The normal high is 81°F and the normal low 59°F, for a daily mean of 70.0°F. August is 0.5°F warmer than July and 1.0°F warmer than September. August is the warmest month of the year in San Jose and the 11th wettest. Across the month the normal high rises 1°F, from 81°F on August 1 to 82°F on August 31. From one year to the next August's mean temperature typically moves about 1.4°F either way (NOAA's standard deviation), so roughly two Augusts in three average between 69°F and 71°F.
Bars above: each day's normal high to low. Columns below: the chance of 0.01 inch or more of precipitation that day, on a scale of 0 to 100% (highest 2%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| August 1 | 81°F | 59°F | 1% | 0% |
| August 8 | 81°F | 59°F | 1% | 0% |
| August 15 | 81°F | 59°F | 1% | 0% |
| August 22 | 82°F | 59°F | 1% | 0% |
| August 31 | 82°F | 58°F | 2% | 0% |
Every day of August: normal high, low and chance of precipitation (warmest afternoon August 26, coldest night August 31)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| August 1 | 81°F | 59°F | 1% | 0% | 14 h 10 min |
| August 2 | 81°F | 59°F | 1% | 0% | 14 h |
| August 3 | 81°F | 59°F | 1% | 0% | 14 h |
| August 4 | 81°F | 59°F | 1% | 0% | 14 h |
| August 5 | 81°F | 59°F | 1% | 0% | 14 h |
| August 6 | 81°F | 59°F | 1% | 0% | 14 h |
| August 7 | 81°F | 59°F | 1% | 0% | 13 h 50 min |
| August 8 | 81°F | 59°F | 1% | 0% | 13 h 50 min |
| August 9 | 81°F | 59°F | 1% | 0% | 13 h 50 min |
| August 10 | 81°F | 59°F | 1% | 0% | 13 h 50 min |
| August 11 | 81°F | 59°F | 1% | 0% | 13 h 50 min |
| August 12 | 81°F | 59°F | 1% | 0% | 13 h 40 min |
| August 13 | 81°F | 59°F | 1% | 0% | 13 h 40 min |
| August 14 | 81°F | 59°F | 1% | 0% | 13 h 40 min |
| August 15 | 81°F | 59°F | 1% | 0% | 13 h 40 min |
| August 16 | 82°F | 59°F | 1% | 0% | 13 h 40 min |
| August 17 | 82°F | 59°F | 1% | 0% | 13 h 30 min |
| August 18 | 82°F | 59°F | 1% | 0% | 13 h 30 min |
| August 19 | 82°F | 59°F | 1% | 0% | 13 h 30 min |
| August 20 | 82°F | 59°F | 1% | 0% | 13 h 30 min |
| August 21 | 82°F | 59°F | 1% | 0% | 13 h 30 min |
| August 22 | 82°F | 59°F | 1% | 0% | 13 h 20 min |
| August 23 | 82°F | 59°F | 1% | 0% | 13 h 20 min |
| August 24 | 82°F | 59°F | 1% | 0% | 13 h 20 min |
| August 25 | 82°F | 59°F | 1% | 0% | 13 h 20 min |
| August 26 | 82°F | 58°F | 1% | 0% | 13 h 10 min |
| August 27 | 82°F | 58°F | 1% | 0% | 13 h 10 min |
| August 28 | 82°F | 58°F | 1% | 0% | 13 h 10 min |
| August 29 | 82°F | 58°F | 1% | 0% | 13 h 10 min |
| August 30 | 82°F | 58°F | 2% | 0% | 13 h 10 min |
| August 31 | 82°F | 58°F | 2% | 0% | 13 h |
- Normal high
- 81°FAugust average
- Normal low
- 59°FAugust average
- Precipitation
- 0.05 inmonth total
- Days with precipitation
- fewer than 10.01 inch or more
- Days at 90°F or more
- 3
- Daylight
- 14 h 10 min to 13 hAugust 1 to August 31
- Days at 70°F or more
- 31
- Days at 80°F or more
- 17
- Sunshine
- 97%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00023293; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in San Jose in August?
On a given August day the chance of 0.01 inch or more is 1% on average, highest around August 31 (2%). In all, 0.05 in falls on 0 days of a normal August.
In a normal August in San Jose, 3 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00023293.
What are the records for August in San Jose?
The warmest August temperature on San Jose's official record (since 1893) is 105°F, on August 1, 1993; the coldest is 39°F, on August 26, 1893. The wettest August brought 1.96 in (1968).
The August mean against the 1991-2020 normal of 70.0°F: 2021 70.4°F (+0.4), 2022 72.0°F (+2.0), 2023 73.7°F (+3.7), 2024 72.4°F (+2.4), 2025 70.5°F (+0.5), 2026 70.4°F (+0.4). 6 of 6 ran warmer than normal.
| August | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 70.4°F | +0.4°F | 0.00 in |
| 2022 | 72.0°F | +2.0°F | 0.00 in |
| 2023 | 73.7°F | +3.7°F | 0.00 in |
| 2024 | 72.4°F | +2.4°F | 0.00 in |
| 2025 | 70.5°F | +0.5°F | 0.00 in |
| 2026 | 70.4°F | +0.4°F | 0.00 in |
Source: records: ACIS, NWS threaded record SJCthr; recent months: ACIS, station USW00023293. Records and recent months use complete months only.
How does August in San Jose compare across California?
Across the 219 places PlainClimate covers in California, August normal highs run from 63°F in Bodega to 109°F in Needles; San Jose's is 81°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.