Climate averages 1991–2020
Modesto weather
in August.
A very hot, very dry month: the 2nd warmest and the 2nd driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
August is a very hot month in Modesto: daytime highs average 34.1°C and nights cool to about 17.7°C. By daytime temperature it is the 2nd warmest of the 12 months.
Rain is very rare: less than 1 mm falls in a typical August (the 2nd driest of the 12 months). Daylight, from sunrise to sunset, lasts about 13 h 37 min on an average August day.
The nearest other city in this atlas is Turlock (21 km away). In August its highs average 34.7°C, 0.6°C warmer than Modesto, with 1.0 mm of rain.
Among the 498 cities listed in the United States, Modesto ranks joint 59th of 498 for the warmest August highs and joint 36th of 498 for the driest August (rainfall, lowest first). The mean August high of those 498 cities is 29.9°C; Modesto is 4.2°C warmer than that mean.
From August to September, average highs fall by 2.8°C to 31.3°C, and monthly rainfall rises from under 1 mm to 1.9 mm.
The annual picture
August in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Modesto climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 14.0°C4.9°C | 4.9°C | 92 | 8.4 | 9.910 h |
| February | 15.8°C6.1°C | 6.1°C | 85 | 8.8 | 10.811 h |
| March | 18.7°C7.7°C | 7.7°C | 72 | 8.3 | 11.912 h |
| April | 22.1°C9.6°C | 9.6°C | 36 | 4.7 | 13.113 h |
| May | 27.4°C12.9°C | 12.9°C | 20 | 3.0 | 14.214 h |
| June | 32.3°C16.0°C | 16.0°C | 3.6 | 0.8 | 14.715 h |
| July | 35.1°C18.2°C | 18.2°C | 0.2 | 0.0 | 14.514 h |
| August, selected | 34.1°C17.7°C | 17.7°C | 0.8 | 0.2 | 13.614 h |
| September | 31.3°C16.3°C | 16.3°C | 1.9 | 0.6 | 12.512 h |
| October | 25.5°C12.8°C | 12.8°C | 22 | 2.6 | 11.311 h |
| November | 18.3°C8.1°C | 8.1°C | 45 | 5.5 | 10.210 h |
| December | 13.7°C5.0°C | 5.0°C | 86 | 8.3 | 9.610 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
August in nearby cities
- Turlock in AugustUnited States · 21 kmHigh 34.7°C · Low 18.9°C · 1.0 mm rain
- Manteca in AugustUnited States · 26 kmHigh 32.6°C · Low 16.2°C · 1.2 mm rain
- Tracy in AugustUnited States · 39 kmHigh 32.9°C · Low 16.3°C · 1.9 mm rain
- Stockton in AugustUnited States · 44 kmHigh 32.1°C · Low 15.8°C · 1.3 mm rain
- Merced in AugustUnited States · 59 kmHigh 35.3°C · Low 19.6°C · 0.6 mm rain
- Livermore in AugustUnited States · 68 kmHigh 29.5°C · Low 14.8°C · 2.1 mm rain
- Pleasanton in AugustUnited States · 77 kmHigh 28.9°C · Low 14.8°C · 2.1 mm rain
- Antioch in AugustUnited States · 82 kmHigh 30.0°C · Low 15.4°C · 1.5 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Modesto) is explained once on the Modesto year overview and on the Sources, method and limits page.