Suisun weather in April

In April, Suisun sees average daytime highs of 71°F and overnight lows near 49°F, with 1.3 in of rain across 4.8 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 68°F in the first days to 74°F by the end. The sky is clear or mostly clear about 46% 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 Suisun's 7th-clearest and 5th-windiest month. For the whole year in context, see Suisun's year-round climate.

Daytime high
71°
7th warmest
Overnight low
49°
6th coldest
Rainfall
1.3 in
4.8 wet days
Daylight
13 hours
5:39 AM – 6:38 PM
Cloud cover
47%
7th clearest
Wind
6 mph
5th windiest
Solar energy
6.19 kWh/m²
Travel score
7.5
out of 10

Suisun is city in Solano County, California, United States.

Density
2,607/km²
people per km²
Founded
1868

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 68°F in the first days to 74°F by the end.

A typical April day in Suisun reaches about 71°F in the afternoon and slips back to 49°F overnight — a 22°F spread between the day's warmth and the night's chill. On most days the high lands between 61°F and 82°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)
16847
26847
36847
46847
56848
66848
76848
86948
96948
106948
116948
126948
137048
147049
157049
167149
177149
187149
197149
207249
217250
227350
237350
247350
257451
267451
277451
287451
297551
307551

Suisun 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°4.39.29.64.3
Feb62° / 44°4.2910.55.2
Mar66° / 46°3.18.211.76.4
Apr71° / 49°1.34.8137.5
May77° / 53°0.73.2148.4
Jun83° / 57°0.20.914.67.7
Jul85° / 58°0.00.114.47.1
Aug85° / 58°0.00.213.57.1
Sep84° / 57°0.10.412.37.7
Oct77° / 53°0.92.7118.5
Nov65° / 47°2.05.89.96.6
Dec58° / 42°3.999.44.3

Cloud cover in April

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 46% 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
45644
55644
65644
75743
85743
95743
105743
115842
125842
135941
145941
156040
166040
176040
186139
196139
206238
216238
226238
236337
246337
256337
266337
276436
286535
296535
306535

Chance of precipitation in April

Any precipitation

Suisun gets around 1.3 in of rain over 4.8 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
320
420
520
620
720
820
920
1020
1119
1219
1319
1418
1518
1617
1716
1815
1915
2014
2114
2213
2313
2413
2512
2612
2712
2812
2912
3012

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 97% 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
10982
11982
12982
13982
14982
15973
16973
17973
18973
19973
20973
21973
22973
23973
24964
25964
26964
27964
28964
29964
30964

Wind in April

Winds average 6 mph in April.

Across April, daily wind ranges from about 6 mph on the calmest days to 7 mph at its breeziest. It stays fairly steady from day to day.

0246810151015202530
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
277calm
287calm
297calm
307calm

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 6:02 AM to 5:20 AM, and sunset from 6:24 PM to 6:51 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.46:026:24
212.46:006:25
312.55:596:26
412.55:576:27
512.55:556:28
612.65:546:29
712.65:526:30
812.75:516:31
912.75:496:31
1012.75:486:32
1112.85:466:33
1212.85:456:34
1312.95:436:35
1412.95:426:36
1513.05:406:37
1613.05:396:38
1713.05:376:39
1813.15:366:40
1913.15:346:41
2013.25:336:42
2113.25:316:43
2213.25:306:44
2313.35:296:45
2413.35:276:46
2513.35:266:47
2613.45:256:48
2713.45:236:49
2813.55:226:50
2913.55:216:50
3013.55:206:51

Solar energy in April

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in April, about 6.19 kWh/m².

For context, solar energy here swings from a low near 2.09 kWh/m² to a high of 8.13 kWh/m² in July across the year — April's 6.19 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.4Bright
25.5Bright
35.5Bright
45.6Bright
55.6Bright
65.7Bright
75.7Bright
85.8Bright
95.8Bright
105.9Bright
116.0Bright
126.0Intense
136.0Intense
146.1Intense
156.2Intense
166.2Intense
176.3Intense
186.3Intense
196.4Intense
206.4Intense
216.5Intense
226.5Intense
236.6Intense
246.6Intense
256.6Intense
266.7Intense
276.7Intense
286.8Intense
296.8Intense
306.8Intense
Planning a trip in April

Hazard calendar for Suisun

In seasonPeak

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

Suisun'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 Suisun?

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

7.5
Sightseeing
5th-best month of the year
5.0
Beach & pool
7th-best month of the year

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

What to pack for Suisun in April

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

In April, Suisun sees daytime highs around 71°F and nights near 49°F. Pack sun protection. About 5 days see rain.

sun protection

Sea temperature near Suisun 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 40 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 Suisun 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 Suisun peaks around June 23 at about 10 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 13 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 highHighModerateJun 23UV 10Dec 13UV 2
UV index (midday)Level
Jan2Moderate
Feb4Moderate
Mar5Moderate
Apr6High
May8Very high
Jun10Very high
Jul10Very high
Aug9Very high
Sep6High
Oct5Moderate
Nov2Moderate
Dec2Low

Air quality in Suisun 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 Suisun 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 Suisun?

Suisun sits at 38.2°N, 122.0°W, 7 ft above sea level, in United States. The nearest listed city is Fairfield, 0.6 mi away.

Topography around Suisun

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

Within 2 miles, the terrain around Suisun has only modest variations in elevation — a maximum elevation change of 194 ft around an average of 16 ft above sea level; within 10 miles, large variations in elevation — a maximum elevation change of 2,382 ft; within 50 miles, very significant variations in elevation — a maximum elevation change of 4,459 ft.

The land around Suisun is covered by artificial surfaces (40%) and wetland (23%) within 2 miles, grassland (43%) within 10 miles, and grassland (32%) and trees (24%) within 50 miles.

2 miles
194 ft
10 miles
2,382 ft
50 miles
4,459 ft
treesgrasslandcroplandartificial surfacesbare terrainwaterwetland
April weather nearby: Fairfield 0.6 mi · Vacaville 8.7 mi · American Canyon 13 mi · Napa 14 mi · Benicia 14 mi · Vallejo 15 mi · Bay Point 15 mi · Martinez 16 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 Suisun (38.2383°, -122.0402°, elevation 7 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).