Climate averages 1991–2020
Hayward weather
in July.
A warm, very dry month: the joint 2nd warmest and the driest of the year. Meets the pleasant-weather rule
Long-term climate patterns, not a forecast for a particular trip.
July is a warm month in Hayward: daytime highs average 26.5°C and nights cool to about 14.1°C. By daytime temperature it is the joint 2nd warmest of the 12 months.
Rain is very rare: less than 1 mm falls in a typical July (the driest month of the year). Daylight, from sunrise to sunset, lasts about 14 h 30 min on an average July day.
The nearest other city in this atlas is Union City (10 km away). In July its highs average 27.9°C, 1.4°C warmer than Hayward, with almost no rain (under 1 mm).
Among the 498 cities listed in the United States, Hayward ranks joint 450th of 498 for the warmest July highs and joint 28th of 498 for the driest July (rainfall, lowest first). The mean July high of those 498 cities is 30.3°C; Hayward is 3.7°C cooler than that mean.
From July to August, average highs rise by 0.2°C to 26.7°C, and monthly rainfall rises from under 1 mm to 1.4 mm.
The annual picture
July 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
Hayward climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 14.0°C5.8°C | 5.8°C | 89 | 8.9 | 9.910 h |
| February | 15.2°C6.8°C | 6.8°C | 94 | 9.0 | 10.811 h |
| March | 17.0°C8.0°C | 8.0°C | 70 | 8.4 | 11.912 h |
| April | 18.9°C9.0°C | 9.0°C | 33 | 4.8 | 13.113 h |
| May | 21.7°C10.8°C | 10.8°C | 17 | 3.0 | 14.214 h |
| June | 24.9°C12.7°C | 12.7°C | 3.4 | 0.9 | 14.715 h |
| July, selected | 26.5°C14.1°C | 14.1°C | 0.7 | 0.2 | 14.514 h |
| August | 26.7°C14.5°C | 14.5°C | 1.4 | 0.2 | 13.614 h |
| September | 26.5°C14.3°C | 14.3°C | 1.7 | 0.4 | 12.512 h |
| October | 23.2°C12.5°C | 12.5°C | 21 | 2.9 | 11.311 h |
| November | 17.5°C9.0°C | 9.0°C | 42 | 5.5 | 10.210 h |
| December | 13.8°C6.2°C | 6.2°C | 81 | 8.7 | 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
July in nearby cities
- Union City in JulyUnited States · 10 kmHigh 27.9°C · Low 14.8°C · 0.9 mm rain
- San Ramon in JulyUnited States · 15 kmHigh 28.1°C · Low 14.4°C · 0.7 mm rain
- Fremont in JulyUnited States · 16 kmHigh 27.5°C · Low 14.8°C · 0.9 mm rain
- Pleasanton in JulyUnited States · 18 kmHigh 29.0°C · Low 14.7°C · 1.0 mm rain
- Oakland in JulyUnited States · 23 kmHigh 26.0°C · Low 13.7°C · 0.4 mm rain
- San Mateo in JulyUnited States · 25 kmHigh 23.2°C · Low 13.7°C · 0.5 mm rain
- Redwood City in JulyUnited States · 25 kmHigh 24.2°C · Low 13.9°C · 0.5 mm rain
- Livermore in JulyUnited States · 28 kmHigh 29.7°C · Low 14.7°C · 1.0 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 Hayward) is explained once on the Hayward year overview and on the Sources, method and limits page.
San Ramon lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.