American Canyon weather in April

In April, American Canyon sees average daytime highs of 69°F and overnight lows near 48°F, with 1.5 in of rain across 4.9 wet days and about 13 hours of daylight. It is the 7th-warmest and 6th-wettest month of the year here.

Highs climb over the month, from about 67°F in the first days to 73°F by the end. The sky is clear or mostly clear about 45% of the time in April, and the air most often feels dry.

Daylight stretches from about 12 h 24 min at the start of April to 13 h 30 min by month's end. Set against the rest of the year, April is American Canyon's 7th-clearest and 4th-windiest month. For the whole year in context, see American Canyon's year-round climate.

Daytime high
69°
7th warmest
Overnight low
48°
6th coldest
Rainfall
1.5 in
4.9 wet days
Daylight
13 hours
5:40 AM – 6:39 PM
Cloud cover
47%
7th clearest
Wind
6 mph
4th windiest
Solar energy
6.16 kWh/m²
Travel score
7.4
out of 10

American Canyon is city in Napa Valley, California, United States.

Density
1,638/km²
people per km²
Founded
1992

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

Temperature in April

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 67°F in the first days to 73°F by the end.

A typical April day in American Canyon reaches about 69°F in the afternoon and slips back to 48°F overnight — a 21°F spread between the day's warmth and the night's chill. On most days the high lands between 60°F and 80°F. Set against its neighbours, April runs about 5°F warmer than March and about 6°F cooler than May.

40°60°80°151015202530
Avg high (°F)Avg low (°F)
16747
26747
36747
46747
56747
66747
76747
86747
96747
106847
116847
126847
136848
146948
156948
166948
176948
187048
197049
207149
217149
227149
237249
247250
257250
267350
277350
287350
297351
307351

American Canyon weather by month

How April compares with the rest of the year at a glance. April is the 7th-warmest and 6th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysDaylight (hours)Travel score
Jan58° / 42°4.69.49.64.3
Feb61° / 44°4.68.610.55.1
Mar65° / 46°3.48.411.76.2
Apr69° / 48°1.54.9137.4
May76° / 52°0.83.2148.4
Jun82° / 56°0.20.914.68.1
Jul84° / 57°0.00.114.47.6
Aug84° / 57°0.00.213.57.5
Sep83° / 56°0.10.412.38.0
Oct76° / 52°1.02.9118.5
Nov65° / 46°2.25.99.96.5
Dec57° / 42°4.39.39.44.3

Cloud cover in April

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 45% of the time in April.

Beyond those clear spells, partly cloudy skies cover about 14% of April, with mostly cloudy or overcast conditions the remaining 40%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15446
25446
35545
45545
55644
65743
75743
85743
95743
105842
115941
125941
136040
145941
156040
166040
176139
186139
196139
206238
216238
226238
236337
246337
256337
266337
276337
286337
296535
306535

Chance of precipitation in April

Any precipitation

American Canyon gets around 1.5 in of rain over 4.9 wet days in April. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 17% and peaks near 20% on the wettest days. The odds ease toward the end of the month.

0%10%20%30%151015202530
Rain chance (%)
120
220
319
419
519
619
720
820
920
1020
1119
1219
1319
1418
1518
1617
1717
1816
1916
2015
2114
2214
2314
2413
2513
2613
2713
2813
2913
3013

Humidity in April

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, April lands in the dry band about 98% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)
1991
2991
3991
4991
5991
6991
7991
8991
9991
10991
11991
12991
13982
14982
15982
16982
17982
18982
19982
20973
21973
22973
23973
24973
25973
26973
27973
28973
29973
30973

Wind in April

Winds average 6 mph in April.

Across April, 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.

0246810151015202530
Wind speed (mph)Feels
15calm
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

Sunrise & sunset in April

DaylightNight

Daylight runs from about 12 h 24 min at the start of April to 13 h 30 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 66 minutes over April. Sunrise moves from 6:03 AM to 5:21 AM, and sunset from 6:25 PM to 6:52 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.46:036:25
212.46:016:26
312.55:596:27
412.55:586:28
512.55:566:29
612.65:556:29
712.65:536:30
812.75:526:31
912.75:506:32
1012.75:496:33
1112.85:476:34
1212.85:466:35
1312.95:446:36
1412.95:436:37
1512.95:416:38
1613.05:406:39
1713.05:386:40
1813.15:376:41
1913.15:356:42
2013.15:346:43
2113.25:326:44
2213.25:316:45
2313.35:306:46
2413.35:286:47
2513.35:276:47
2613.45:266:48
2713.45:246:49
2813.55:236:50
2913.55:226:51
3013.55:216:52

Solar energy in April

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in April, about 6.16 kWh/m².

For context, solar energy here swings from a low near 2.08 kWh/m² to a high of 8.05 kWh/m² in July across the year — April's 6.16 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.4Bright
25.5Bright
35.5Bright
45.5Bright
55.6Bright
65.7Bright
75.7Bright
85.8Bright
95.8Bright
105.8Bright
115.9Bright
126.0Bright
136.0Intense
146.1Intense
156.1Intense
166.2Intense
176.2Intense
186.3Intense
196.3Intense
206.4Intense
216.4Intense
226.5Intense
236.5Intense
246.6Intense
256.6Intense
266.7Intense
276.7Intense
286.7Intense
296.8Intense
306.8Intense
Planning a trip in April

Hazard calendar for American Canyon

In seasonPeak

None of American Canyon's seasonal hazards are active in April. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.

American Canyon's rainy season runs November–March, when most of the year's rain falls.

Rainy season
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is April a good time to visit American Canyon?

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

7.4
Sightseeing
7th-best month of the year
4.4
Beach & pool
7th-best month of the year

April is one of the better times to visit American Canyon for general sightseeing.

What to pack for American Canyon in April

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

In April, American Canyon sees daytime highs around 69°F and nights near 48°F. Pack sun protection. About 5 days see rain.

sun protection

Sea temperature near American Canyon in April

The nearest coast averages about 53°F in April — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 29 mi away) is warmest in September at about 58°F and coldest in April near 53°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
Jan53Bracing
Feb53Bracing
Mar54Bracing
Apr53Bracing
May53Bracing
Jun54Bracing
Jul56Bracing
Aug58Bracing
Sep58Bracing
Oct57Bracing
Nov55Bracing
Dec54Bracing

UV index in American Canyon in April

LowModerateHighVery highExtreme

Clear-sky midday UV in April peaks around 6 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in American Canyon peaks around July 11 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 highHighModerateJul 11UV 10Dec 15UV 2
UV index (midday)Level
Jan2Moderate
Feb4Moderate
Mar5Moderate
Apr6High
May8Very high
Jun10Extreme
Jul10Extreme
Aug10Very high
Sep6High
Oct5High
Nov2Moderate
Dec2Low

Air quality in American Canyon in April

GoodModeratePoorUnhealthyVery unhealthy

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

Air quality in American Canyon is worst in September — around 29 µg/m³ PM2.5 (moderate), about 4.2× the cleanest month (June, 7 µg/m³).

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

010203040JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodModerateSep 1829 µg/m³Jun 127 µg/m³
PM2.5 (µg/m³)Level
Jan13Moderate
Feb13Moderate
Mar13Moderate
Apr10Good
May8Good
Jun7Good
Jul10Good
Aug25Moderate
Sep29Moderate
Oct27Moderate
Nov16Moderate
Dec12Good
Location & terrain

Where is American Canyon?

American Canyon sits at 38.2°N, 122.3°W, 46 ft above sea level, in United States. The nearest listed city is Vallejo, 5.0 mi away.

Topography around American Canyon

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

Within 2 miles, the terrain around American Canyon has only modest variations in elevation — a maximum elevation change of 817 ft around an average of 82 ft above sea level; within 10 miles, significant variations in elevation — a maximum elevation change of 1,903 ft; within 50 miles, very significant variations in elevation — a maximum elevation change of 4,459 ft.

The land around American Canyon is covered by artificial surfaces (33%) and grassland (31%) within 2 miles, grassland (38%) and water (23%) within 10 miles, and grassland (29%), trees (25%) and water (22%) within 50 miles.

2 miles
817 ft
10 miles
1,903 ft
50 miles
4,459 ft
treesshrubsgrasslandcroplandartificial surfacesbare terrainwaterwetland
April weather nearby: Vallejo 5.0 mi · Napa 8.7 mi · Benicia 11 mi · Hercules 11 mi · Pinole 12 mi · Suisun 13 mi · Martinez 13 mi · Fairfield 13 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 American Canyon (38.1749°, -122.2608°, elevation 46 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).