Tracy weather in May

In May, Tracy sees average daytime highs of 77°F and overnight lows near 53°F, with 0.7 in of rain across 3.1 wet days and about 14 hours of daylight. It is the 5th-warmest and 8th-wettest month of the year here.

Highs climb over the month, from about 75°F in the first days to 80°F by the end. The sky is clear or mostly clear about 60% of the time in May, and the air most often feels dry.

Daylight stretches from about 13 h 30 min at the start of May to 14 h 24 min by month's end. Set against the rest of the year, May is Tracy's 6th-clearest and 1st-windiest month. For the whole year in context, see Tracy's year-round climate.

Daytime high
77°
5th warmest
Overnight low
53°
8th coldest
Rainfall
0.7 in
3.1 wet days
Daylight
14 hours
5:01 AM – 7:03 PM
Cloud cover
35%
6th clearest
Wind
6 mph
1st windiest
Solar energy
7.42 kWh/m²
Travel score
8.4
out of 10

Tracy is city in San Joaquin County, California, United States.

Density
1,509/km²
people per km²
Founded
1910

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

Temperature in May

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 75°F in the first days to 80°F by the end.

A typical May day in Tracy reaches about 77°F in the afternoon and slips back to 53°F overnight — a 24°F spread between the day's warmth and the night's chill. On most days the high lands between 66°F and 89°F. Set against its neighbours, May runs about 7°F warmer than April and about 7°F cooler than June.

40°60°80°151015202531
Avg high (°F)Avg low (°F)
17451
27551
37551
47551
57552
67552
77652
87652
97652
107652
117652
127652
137653
147653
157753
167753
177753
187753
197753
207853
217854
227854
237854
247854
257954
267954
277955
288055
298055
308055
318055

Tracy weather by month

How May compares with the rest of the year at a glance. May is the 5th-warmest and 8th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysDaylight (hours)Travel score
Jan57° / 41°3.39.19.74.2
Feb60° / 43°3.28.710.55.0
Mar65° / 46°2.68.911.76.2
Apr70° / 48°1.3512.97.5
May77° / 53°0.73.1148.4
Jun84° / 57°0.10.814.67.5
Jul88° / 60°0.00.214.36.2
Aug87° / 60°0.10.213.56.5
Sep83° / 57°0.10.612.37.8
Oct75° / 52°0.82.7118.6
Nov64° / 46°1.55.5106.5
Dec57° / 41°3.08.39.44.2

Cloud cover in May

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 60% of the time in May.

Beyond those clear spells, partly cloudy skies cover about 13% of May, with mostly cloudy or overcast conditions the remaining 27%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
16931
26931
37030
47030
57030
67030
77030
87030
97030
107030
117129
127129
137129
147228
157228
167228
177327
187327
197327
207426
217525
227525
237525
247723
257723
267723
277723
287921
297921
307921
317921

Chance of precipitation in May

Any precipitation

Tracy gets around 0.7 in of rain over 3.1 wet days in May. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 10% and peaks near 11% on the wettest days.

0%10%20%30%151015202531
Rain chance (%)
111
211
311
411
511
611
711
811
911
1011
1111
1211
1311
1411
1511
1611
1711
1811
1910
2010
2110
229
239
248
258
267
277
286
296
306
316

Humidity in May

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, May lands in the dry band about 96% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)
1973
2973
3973
4973
5973
6973
7973
8973
9973
10973
11973
12973
13973
14973
15982
16982
17982
18973
19973
20973
21973
22973
23964
24964
25964
26955
27955
28946
29946
30946
31937

Wind in May

Winds average 6 mph in May, the windiest month of the year.

Across May, daily wind ranges from about 6 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
216calm
226calm
236calm
246calm
256calm
266calm
276calm
286calm
296calm
306calm
316calm

Sunrise & sunset in May

DaylightNight

Daylight runs from about 13 h 30 min at the start of May to 14 h 24 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 54 minutes over May. Sunrise moves from 5:17 AM to 4:51 AM, and sunset from 6:49 PM to 7:15 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.55:176:49
213.65:166:50
313.65:146:51
413.65:136:52
513.75:126:53
613.75:116:54
713.75:106:55
813.85:096:56
913.85:086:56
1013.85:076:57
1113.95:066:58
1213.95:056:59
1313.95:047:00
1414.05:037:01
1514.05:027:02
1614.05:017:03
1714.15:007:04
1814.14:597:05
1914.14:597:05
2014.14:587:06
2114.24:577:07
2214.24:567:08
2314.24:567:09
2414.24:557:10
2514.34:547:10
2614.34:547:11
2714.34:537:12
2814.34:537:13
2914.44:527:13
3014.44:527:14
3114.44:517:15

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 7.42 kWh/m².

For context, solar energy here swings from a low near 2.26 kWh/m² to a high of 8.27 kWh/m² in July across the year — May's 7.42 kWh/m² falls in the middle.

02468151015202531
Solar energy (kWh/m²)Level
17.0Intense
27.0Intense
37.1Intense
47.1Intense
57.1Intense
67.2Intense
77.2Intense
87.2Intense
97.2Intense
107.3Intense
117.3Intense
127.3Intense
137.3Intense
147.4Intense
157.4Intense
167.4Intense
177.4Intense
187.5Intense
197.5Intense
207.5Intense
217.5Intense
227.6Intense
237.6Intense
247.7Intense
257.7Intense
267.7Intense
277.8Intense
287.8Intense
297.8Intense
307.8Intense
317.9Intense
Planning a trip in May

Is May a good time to visit Tracy?

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

8.4
Sightseeing
2nd-best month of the year
7.5
Beach & pool
5th-best month of the year

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

What to pack for Tracy in May

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

In May, Tracy sees daytime highs around 77°F and nights near 53°F. Pack sun protection. Worth having: light clothes. About 3 days see rain.

sun protectionlight clothes

UV index in Tracy in May

LowModerateHighVery highExtreme

Clear-sky midday UV in May peaks around 8 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Tracy peaks around June 22 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 22UV 10Dec 15UV 2
UV index (midday)Level
Jan2Moderate
Feb4Moderate
Mar4Moderate
Apr7High
May8Very high
Jun10Extreme
Jul10Extreme
Aug10Very high
Sep6High
Oct5High
Nov2Moderate
Dec2Moderate

Air quality in Tracy in May

GoodModeratePoorUnhealthyVery unhealthy

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

Air quality in Tracy is worst in August — around 34 µg/m³ PM2.5 (moderate), about 4.9× the cleanest month (June, 7 µg/m³).

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

010203040JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodModerateAug 1832 µg/m³Jun 157 µg/m³
PM2.5 (µg/m³)Level
Jan13Moderate
Feb13Moderate
Mar13Moderate
Apr10Good
May8Good
Jun7Good
Jul9Good
Aug34Moderate
Sep16Moderate
Oct14Moderate
Nov15Moderate
Dec12Good
Location & terrain

Where is Tracy?

Tracy sits at 37.7°N, 121.4°W, 52 ft above sea level, in United States. The nearest listed city is Lathrop, 9.9 mi away.

Topography around Tracy

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

Within 2 miles, the terrain around Tracy has only modest variations in elevation — a maximum elevation change of 118 ft around an average of 52 ft above sea level; within 10 miles, significant variations in elevation — a maximum elevation change of 1,795 ft; within 50 miles, very significant variations in elevation — a maximum elevation change of 4,373 ft.

The land around Tracy is covered by artificial surfaces (64%) within 2 miles, grassland (41%) and cropland (31%) within 10 miles, and grassland (40%) and trees (24%) within 50 miles.

2 miles
118 ft
10 miles
1,795 ft
50 miles
4,373 ft
treesgrasslandcroplandartificial surfacesbare terrainwaterwetland
May weather nearby: Lathrop 9.9 mi · Manteca 12 mi · Ripon 17 mi · Stockton 17 mi · Livermore 19 mi · Brentwood 20 mi · Oakley 24 mi · Modesto 24 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 Tracy (37.7399°, -121.4262°, elevation 52 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. 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).