Hayward, California climate: Normal weather by month, frost dates and records
Hayward's normal year runs from 43°F January nights to 76°F August afternoons, with 16.0 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 15.3°C, January lows of 6°C, August highs of 25°C, 406 mm of precipitation a year.
- NOAA stationHayward Air Terminal
- Station IDUSW00093228
- Location37.65°N 122.11°W
- Elevation43 ft (13 m)
- From the center2 miles
- Population158,440
On October 14, the normal high in Hayward is 74°F and the normal low 54°F, and the chance of measurable rain or snow is 9%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Hayward.
- Jan 59° 43°
- Feb 62° 45°
- Mar 64° 47°
- Apr 67° 50°
- May 69° 52°
- Jun 74° 55°
- Jul 75° 57°
- Aug 76° 58°
- Sep 77° 58°
- Oct 74° 54°
- Nov 65° 47°
- Dec 59° 43°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
What is the weather like in Hayward each month?
August is the warmest month, with normal highs of 76°F; January the coldest, with normal lows of 43°F. The most precipitation falls in December (3.20 in), the least in July (0.00 in).
Each month has its own page with the day-by-day normals, the month's records and its recent years:
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 59°F | 43°F | 51.2°F | 2.91 | 10 | <1 | 1 | 9 h 50 min |
| February | 62°F | 45°F | 53.5°F | 3.11 | 9 | <1 | <1 | 10 h 50 min |
| March | 64°F | 47°F | 55.9°F | 2.35 | 9 | <1 | <1 | 11 h 50 min |
| April | 67°F | 50°F | 58.2°F | 1.20 | 6 | <1 | <1 | 13 h 10 min |
| May | 69°F | 52°F | 60.9°F | 0.58 | 3 | 1 | <1 | 14 h 10 min |
| June | 74°F | 55°F | 64.6°F | 0.15 | 1 | 1 | <1 | 14 h 40 min |
| July | 75°F | 57°F | 66.1°F | 0.00 | <1 | 1 | <1 | 14 h 30 min |
| August | 76°F | 58°F | 67.3°F | 0.10 | <1 | 2 | <1 | 13 h 40 min |
| September | 77°F | 58°F | 67.3°F | 0.08 | 1 | 3 | <1 | 12 h 30 min |
| October | 74°F | 54°F | 63.5°F | 0.81 | 3 | 1 | <1 | 11 h 20 min |
| November | 65°F | 47°F | 56.2°F | 1.51 | 7 | <1 | <1 | 10 h 10 min |
| December | 59°F | 43°F | 51.2°F | 3.20 | 10 | <1 | 1 | 9 h 40 min |
| Year (annual) | 69°F | 51°F | 59.6°F | 16.00 | 60 | 9 | 1 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 15°C | 6°C | 10.7°C | 74 mm |
| February | 17°C | 7°C | 11.9°C | 79 mm |
| March | 18°C | 9°C | 13.3°C | 60 mm |
| April | 19°C | 10°C | 14.6°C | 30 mm |
| May | 21°C | 11°C | 16.1°C | 15 mm |
| June | 23°C | 13°C | 18.1°C | 4 mm |
| July | 24°C | 14°C | 18.9°C | 0 mm |
| August | 25°C | 15°C | 19.6°C | 3 mm |
| September | 25°C | 14°C | 19.6°C | 2 mm |
| October | 23°C | 12°C | 17.5°C | 21 mm |
| November | 18°C | 8°C | 13.4°C | 38 mm |
| December | 15°C | 6°C | 10.7°C | 81 mm |
Source: NOAA NCEI 1991-2020 monthly normals, station USW00093228; annual normals. Wet days: 0.01 inch or more; 90°F days and freezing nights: NOAA's day counts. Daylight: sunrise to sunset on the 15th, computed from the latitude.
When is the best weather to visit Hayward?
Normal highs sit between 65°F and 85°F in April, May, June, July, August, September, October and November. Of those, July has the fewest days with rain (0).
That is a measurement, not a recommendation: it counts the months whose normal afternoon high sits between 65°F and 85°F, where a light layer is enough by day.
Source: NOAA NCEI 1991-2020 monthly normals, station USW00093228.
When is the last frost in Hayward?
A night at 32°F or colder comes in only 45% of years in Hayward (NOAA). NOAA's median date of the last spring frost is January 2 and of the first autumn frost December 25.
NOAA puts the median frost-free season at 365 days, and the season without a hard freeze (28°F) at 365 days.
The USDA's 2023 Plant Hardiness Zone Map puts Hayward in zones 9b to 10a across its 5 ZIP code areas (10a in 94545, the largest). By the map's own method, the average of each year's coldest night over 1991-2020, Hayward's NOAA station is in zone 10a: the coldest night of a typical year reaches 33°F (22 complete years).
Frost dates for every NOAA station in California · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USW00093228; USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026; the station zone: ACIS daily lows, 1991-2020. A 10% date means one year in ten has a frost after it in spring or before it in autumn.
What hardiness zone is each Hayward ZIP code in?
The USDA's 2023 map gives each ZIP code area one zone. Hayward's 5 ZIP code areas run from zone 9b to 10a: 3 in 10a and 2 in 9b. Each ZIP's frost dates are in the frost tool.
Source: USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026; ZIP areas in the place: Census Bureau 2020 ZCTA-to-place relationship file. A ZIP area counts when at least a tenth of its land (and 0.5 km²) lies in the place.
How hot and how cold does it get in Hayward?
In a normal year in Hayward, 9 days a year reach 90°F (1 of them 100°F or more), 1 night falls to 32°F or colder and 60 days bring measurable precipitation.
- Days at 90°F or more
- 9a normal year
- Days at 100°F or more
- 1a normal year
- Nights at 32°F or colder
- 1a normal year
- Days that stay below freezing
- fewer than 1high of 32°F or less
- Days with 0.01 inch of precipitation
- 60a normal year
The highest temperature in this station's record (since 1998) is 108°F, on September 2, 2017; the lowest is 27°F, on December 23, 1998.
The wettest calendar year on that record is 2024, with 24.21 in.
Source: NOAA NCEI 1991-2020 annual normals, station USW00093228; records: ACIS (NOAA Regional Climate Centers), station USW00093228. Records use complete months only; a month missing more than three days is left out.
How sunny is Hayward?
Over a year 80% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Hayward, 4.7 kWh per square metre a day. June is the sunniest month (84%) and December the cloudiest (74%). Among the 459 U.S. places of 50,000 or more, that ranks tied 125th (with 50 others) in sunshine.
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 76% | 2.5 |
| February | 77% | 3.4 |
| March | 79% | 4.6 |
| April | 82% | 6.0 |
| May | 81% | 6.7 |
| June | 84% | 7.3 |
| July | 78% | 6.5 |
| August | 77% | 5.8 |
| September | 82% | 5.1 |
| October | 83% | 4.0 |
| November | 81% | 2.8 |
| December | 74% | 2.1 |
Source: NASA POWER solar climatology, 2001-2020 (CERES SYN1deg). Satellite-based, for the 1-degree cell (about 100 km across) around the station, so it describes the area rather than the airport.
How much heating and cooling does Hayward need?
A normal year in Hayward brings 2,315 heating degree days, 57% fewer than the median U.S. place (5,373), and 367 cooling degree days, 60% fewer than the median (908). Three months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 3,627 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 428 | 0 |
| February | 322 | 0 |
| March | 285 | 2 |
| April | 214 | 9 |
| May | 149 | 21 |
| June | 64 | 51 |
| July | 29 | 62 |
| August | 15 | 86 |
| September | 25 | 94 |
| October | 88 | 41 |
| November | 268 | 2 |
| December | 429 | 0 |
| Year (annual) | 2,315 | 367 |
Source: NOAA NCEI 1991-2020 monthly normals, station USW00093228. A degree day is one degree of a day's mean temperature below 65°F (heating) or above it (cooling); utilities use them to estimate energy use.
Has Hayward been warmer than normal lately?
2025 averaged 60.3°F, 0.7°F above the 1991-2020 normal of 59.6°F. 2 of the 5 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 59.2°F | −0.4°F | 18.02 |
| 2022 | 59.3°F | −0.3°F | 15.32 |
| 2023 | 59.5°F | −0.1°F | 23.18 |
| 2024 | 62.1°F | +2.5°F | 24.21 |
| 2025 | 60.3°F | +0.7°F | 16.28 |
Source: observed years: ACIS, station USW00093228. A year counts only with all twelve months complete.
How does Hayward's climate compare?
Hayward is warmer than 87 of the other 218 places with their own NOAA record in California, and wetter than 111. Across the 7,247 U.S. stations with normals, its annual mean of 59.6°F is warmer than 74%.
In the Köppen classification computed from these normals, Hayward is Csb: temperate, dry-summer, warm summer. What the classes mean.
Places with the most similar year elsewhere
Measured month by month on the normal high, low and precipitation, among places of 20,000 or more people in other states:
Source: NOAA NCEI 1991-2020 normals for every station PlainClimate covers. Similarity: the root-mean-square difference of the 36 monthly figures, precipitation weighted so an inch counts like 6°F.
Which places near Hayward share this climate record?
6 places have no NOAA station with 1991-2020 normals of their own, and this station is the nearest full record. A place's own climate can differ from these figures, by several degrees where it sits much higher or lower than the station, nearer the coast, or inside a large city's heat; for the larger places the next nearest records are named with their yearly mean, so the spread around them is visible, and places of 50,000 or more have their own page with NOAA's gridded normals.
- Castro Valley, CAalso near: Oakland (9 mi, 58.1°F a year); Fremont (12 mi, 59.5°F a year)65,389 people · 5 mi NE
- San Lorenzo, CA29,453 people · 2 mi NW
- Ashland, CA22,784 people · 3 mi N
- Cherryland, CA14,575 people · 2 mi N
- Fairview, CA10,033 people · 4 mi NE
- Norris Canyon, CA846 people · 9 mi NE
Source: Census Bureau 2024 Gazetteer (place centers) and Vintage 2024 population estimates. Distance and direction from the station to each place's center.
Questions about Hayward's climate
What is the coldest month in Hayward?
January, with a normal high of 59°F and a normal low of 43°F. The warmest is August (76°F by day, 58°F at night).
What is the rainiest month in Hayward?
December, with 3.20 in of precipitation in a normal year; the driest is July with 0.00 in.
What plant hardiness zone is Hayward in?
The USDA's 2023 map puts Hayward in zones 9b to 10a across its 5 ZIP code areas (10a in 94545, the largest). By the same method at Hayward's NOAA station, the coldest night of a typical year reaches 33°F (22 years, 1991-2020): zone 10a.
Nearby and next
- Hayward in OctoberThis month day by day, its records and recent years
- California climateThe statewide normals and every place in the state
- Oakland, CA7 miles from this station, 58.1°F a year
- Fremont, CA9 miles from this station, 59.5°F a year
- Newark, CA11 miles from this station, 59.9°F a year
- Oakland Museum, CA13 miles from this station, 59.6°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made