Hayward weather in August

In August, Hayward sees average daytime highs of 80°F and overnight lows near 57°F, with 0.1 in of rain across 0.2 wet days and about 13.5 hours of daylight. It is the 1st-warmest and 11th-wettest month of the year here.

Day-to-day highs hold fairly steady near 80°F through the month. The sky is clear or mostly clear about 89% of the time in August, and the air most often feels dry.

Daylight stretches from about 14 hours at the start of August to 12 h 54 min by month's end. Set against the rest of the year, August is Hayward's 2nd-clearest and 5th-windiest month. For the whole year in context, see Hayward's year-round climate.

Daytime high
80°
1st warmest
Overnight low
57°
12th coldest
Rainfall
0.1 in
0.2 wet days
Daylight
13 h 30 min
5:28 AM – 6:56 PM
Cloud cover
12%
2nd clearest
Wind
6 mph
5th windiest
Solar energy
7.21 kWh/m²
Travel score
9.0
out of 10

Hayward is city in Alameda County, California, United States.

Density
958/km²
people per km²
Founded
1876

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in August

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 80°F through the month.

A typical August day in Hayward reaches about 80°F in the afternoon and slips back to 57°F overnight — a 23°F spread between the day's warmth and the night's chill. On most days the high lands between 73°F and 90°F. Set against its neighbours, August runs on par with July and on par with September.

50°60°70°80°90°151015202531
Avg high (°F)Avg low (°F)
18057
28057
38057
48057
58057
68057
78057
88057
98057
108057
118057
128057
138057
148057
158057
168057
178057
188057
198057
208057
218057
228057
238057
248057
258057
268057
278157
288157
298157
308157
318157

Hayward weather by month

How August compares with the rest of the year at a glance. August is the 1st-warmest and 11th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysDaylight (hours)Travel score
Jan57° / 42°3.599.74.2
Feb60° / 43°3.78.910.54.9
Mar63° / 45°2.88.411.76.0
Apr67° / 47°1.34.812.97.1
May72° / 51°0.73148.2
Jun77° / 54°0.10.914.69.1
Jul80° / 57°0.00.214.39.0
Aug80° / 57°0.10.213.59.0
Sep79° / 55°0.10.412.39.0
Oct74° / 52°0.82.9118.6
Nov64° / 46°1.65.5106.4
Dec57° / 42°3.28.79.44.2

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 89% of the time in August.

Beyond those clear spells, partly cloudy skies cover about 5% of August, with mostly cloudy or overcast conditions the remaining 5%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
1946
2946
3946
4946
5946
6946
7946
8946
9937
10937
11937
12937
13946
14946
15946
16946
17946
18955
19955
20955
21955
22955
23955
24955
25964
26964
27964
28964
29964
30964
31964

Chance of precipitation in August

Any precipitation

Hayward gets around 0.1 in of rain over 0.2 wet days in August. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 1% and peaks near 1% on the wettest days.

0%10%20%30%151015202531
Rain chance (%)
10
20
30
40
50
60
70
80
90
100
110
120
131
141
151
161
171
181
191
201
211
221
231
241
251
261
271
281
291
301
311

Humidity in August

DryComfortableHumidMuggyOppressiveMiserable

Most of August feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, August lands in the dry band about 57% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)
157421
257421
357421
457421
557421
657421
757421
857421
956431
1056431
1156431
1256431
1356431
1456431
1555432
1655432
1755432
1855432
1955432
2055432
2156422
2256422
2356422
2456422
2557412
2657412
2758402
2859392
2960382
3061372
3162362

Wind in August

Winds average 6 mph in August.

Across August, daily wind ranges from about 5 mph on the calmest days to 6 mph at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (mph)Feels
16calm
26calm
36calm
46calm
56calm
66calm
76calm
86calm
96calm
106calm
116calm
126calm
136calm
146calm
156calm
166calm
176calm
186calm
196calm
206calm
215calm
225calm
235calm
245calm
255calm
265calm
275calm
285calm
295calm
305calm
315calm

Sunrise & sunset in August

DaylightNight

Daylight runs from about 14 hours at the start of August to 12 h 54 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 66 minutes over August. Sunrise moves from 5:15 AM to 5:42 AM, and sunset from 7:13 PM to 6:35 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
114.05:157:13
213.95:167:12
313.95:177:11
413.95:187:10
513.85:197:09
613.85:207:08
713.85:217:07
813.75:217:06
913.75:227:05
1013.75:237:04
1113.65:247:03
1213.65:257:01
1313.65:267:00
1413.55:276:59
1513.55:286:58
1613.55:286:56
1713.45:296:55
1813.45:306:54
1913.45:316:52
2013.35:326:51
2113.35:336:50
2213.25:346:48
2313.25:356:47
2413.25:366:45
2513.15:366:44
2613.15:376:43
2713.05:386:41
2813.05:396:40
2913.05:406:38
3012.95:416:37
3112.95:426:35

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 7.21 kWh/m².

For context, solar energy here swings from a low near 2.23 kWh/m² to a high of 8.04 kWh/m² in June across the year — August's 7.21 kWh/m² falls in the middle.

02468151015202531
Solar energy (kWh/m²)Level
17.6Intense
27.6Intense
37.6Intense
47.6Intense
57.5Intense
67.5Intense
77.5Intense
87.5Intense
97.4Intense
107.4Intense
117.4Intense
127.3Intense
137.3Intense
147.3Intense
157.3Intense
167.2Intense
177.2Intense
187.2Intense
197.1Intense
207.1Intense
217.1Intense
227.0Intense
237.0Intense
247.0Intense
256.9Intense
266.9Intense
276.8Intense
286.8Intense
296.8Intense
306.7Intense
316.7Intense
Planning a trip in August

Is August a good time to visit Hayward?

Our two travel scores rate August for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

9.0
Sightseeing
2nd-best month of the year
8.9
Beach & pool
1st-best month of the year

August is one of the better times to visit Hayward for general sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Hayward in August

From August's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In August, Hayward sees daytime highs around 80°F and nights near 57°F. Pack sun protection. Worth having: light clothes.

sun protectionlight clothes

Sea temperature near Hayward in August

The nearest coast averages about 59°F in August — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 26 mi away) is warmest in August at about 59°F and coldest in April near 54°F.

The water stays below 68°F all year — cool enough that most swimmers want a wetsuit.

52°54°56°58°60°JanFebMarAprMayJunJulAugSepOctNovDecbracingcool
Sea temperature (°F)Comfort
Jan54Bracing
Feb54Bracing
Mar54Bracing
Apr54Bracing
May54Bracing
Jun55Bracing
Jul57Bracing
Aug59Bracing
Sep59Bracing
Oct58Bracing
Nov56Bracing
Dec55Bracing

UV index in Hayward in August

LowModerateHighVery highExtreme

Clear-sky midday UV in August peaks around 10 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Hayward peaks around June 23 at about 10 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 15 at about 2 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 9 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highExtremeVery highHighModerateJun 23UV 10Dec 15UV 2
UV index (midday)Level
Jan2Moderate
Feb4Moderate
Mar5Moderate
Apr7High
May8Very high
Jun10Extreme
Jul10Extreme
Aug10Very high
Sep6High
Oct5High
Nov2Moderate
Dec2Moderate

Air quality in Hayward in August

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where August falls, not just the annual average.

Air quality in Hayward is worst in August — around 25 µg/m³ PM2.5 (moderate), about 2.5× the cleanest month (June, 10 µg/m³).

Modeled monthly averages (CAMS reanalysis, 2015–2024).

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodModerateAug 1824 µg/m³Jun 1110 µg/m³
PM2.5 (µg/m³)Level
Jan15Moderate
Feb18Moderate
Mar16Moderate
Apr12Moderate
May10Good
Jun10Good
Jul11Good
Aug25Moderate
Sep17Moderate
Oct20Moderate
Nov18Moderate
Dec13Moderate
Location & terrain

Where is Hayward?

Hayward sits at 37.7°N, 122.1°W, 112 ft above sea level, in United States. The nearest listed city is Castro Valley, 1.9 mi away.

Topography around Hayward

How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Hayward.

Within 2 miles, the terrain around Hayward has only modest variations in elevation — a maximum elevation change of 653 ft around an average of 171 ft above sea level; within 10 miles, large variations in elevation — a maximum elevation change of 2,306 ft; within 50 miles, very significant variations in elevation — a maximum elevation change of 4,452 ft.

The land around Hayward is covered by artificial surfaces (75%) within 2 miles, artificial surfaces (29%), trees (25%) and water (23%) within 10 miles, and water (27%), grassland (26%) and trees (25%) within 50 miles.

2 miles
653 ft
10 miles
2,306 ft
50 miles
4,452 ft
treesgrasslandcroplandartificial surfaceswaterwetland
August weather nearby: Castro Valley 1.9 mi · Ashland 2.5 mi · San Lorenzo 3.1 mi · San Leandro 5.6 mi · Union City 6.2 mi · Dublin 8.1 mi · San Ramon 9.3 mi · Fremont 9.9 mi

United States travel facts

Power plugs
Type A / B
120 V · 60 Hz
Prices
≈ 100% of US
price level, 2025
GDP per capita
$90,027
2025
Happiness
6.8 / 10
World Happiness, 2025
Safe drinking water
98%
of population, 2024
Homicide rate
5.8
per 100k, 2023
Road deaths
12.7
per 100k/yr, 2019
Income group
High
World Bank
Religion
Protestant 47%unaffiliated 23%Roman Catholic 21%Jewish 2%

Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.

Data sources

Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Hayward (37.6688°, -122.0808°, elevation 112 ft), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).