Ostrov weather in April

In April, Ostrov sees average daytime highs of 11°C and overnight lows near 2°C, with 47 mm of precipitation across 11.4 wet days and about 13.5 hours of daylight. It is the 6th-warmest and 11th-wettest month of the year here.

Highs climb over the month, from about 9°C in the first days to 14°C by the end. The sky is clear or mostly clear about 21% of the time in April, and the air most often feels dry.

Daylight stretches from about 12 h 36 min at the start of April to 14 h 24 min by month's end. Set against the rest of the year, April is Ostrov's 4th-clearest and 7th-windiest month. For the whole year in context, see Ostrov's year-round climate.

Daytime high: 11°; 6th warmest
Overnight low: 2°; 6th coldest
Precipitation: 47 mm; 11.4 wet days
Daylight: 13 h 30 min; 5:23 AM – 6:54 PM
Cloud cover: 66%; 4th clearest
Wind: 11 km/h; 7th windiest
Solar energy: 4.46 kWh/m²
Travel score: 2.8; out of 10

Ostrov is town in the Czech Republic.

Density: 311/km²; people per km²
Founded: 1331

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

← March Ostrov year-round climate May →Best places to visit in April

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

Temperature in April

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 9°C in the first days to 14°C by the end.

A typical April day in Ostrov reaches about 11°C in the afternoon and slips back to 2°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 5°C and 18°C. Set against its neighbours, April runs about 6°C warmer than March and about 5°C cooler than May.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Avg high (°C)	9	9	9	9	9	10	10	10	10	10	10	10	11	11	11	11	12	12	12	12	13	13	13	13	14	14	14	14	14	15
Avg low (°C)	0	1	1	1	1	1	1	1	1	1	1	2	2	2	2	2	2	3	3	3	3	3	4	4	4	4	4	5	5	5

	Avg high (°C)	Avg low (°C)
1	9	0
2	9	1
3	9	1
4	9	1
5	9	1
6	10	1
7	10	1
8	10	1
9	10	1
10	10	1
11	10	1
12	10	2
13	11	2
14	11	2
15	11	2
16	11	2
17	12	2
18	12	3
19	12	3
20	12	3
21	13	3
22	13	3
23	13	4
24	13	4
25	14	4
26	14	4
27	14	4
28	14	5
29	14	5
30	15	5

How April really feels in Ostrov

Once humidity and wind are folded in, April averages 0 days that feel above 32°C and 19 that feel at or below 0°C — the comfort signal a plain temperature reading hides.

Days feeling ≥ 32°C

heat index over the day's high

Days feeling ≤ 0°C

wind chill below the day's low

The story in April is cold — wind chill drags the overnight "feels like" below the raw low.

Ostrov weather by month

How April compares with the rest of the year at a glance. April is the 6th-warmest and 11th-wettest month here — the current month is highlighted below.

Month	High / Low (°C)	Rainfall (mm)	Wet days	Snow days	Daylight (hours)	Travel score
Jan	0° / -4°	50	11.5	8.7	8.3	0.0
Feb	1° / -4°	39	8.9	6.7	9.7	0.0
Mar	6° / -1°	52	11.9	6.1	11.5	0.5
Apr	11° / 2°	47	11.4	1.8	13.5	2.8
May	16° / 7°	70	14	0.1	15.2	4.6
Jun	19° / 10°	82	13.9	0	16.1	5.5
Jul	22° / 12°	90	14	0	15.7	5.9
Aug	21° / 12°	78	12.8	0	14.3	6.1
Sep	17° / 8°	60	10.4	0	12.4	5.0
Oct	11° / 4°	52	10.5	0.8	10.5	2.5
Nov	5° / 0°	49	9.5	4	8.8	0.3
Dec	1° / -3°	52	10.6	8.1	7.9	0.0

Cloud cover in April

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 21% 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 65%.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Clearer (%)	32	32	32	32	32	32	32	31	31	32	33	33	33	34	36	37	37	38	38	38	39	39	38	37	37	37	36	35	34	33
Cloudier (%)	68	68	68	68	68	68	68	69	69	68	67	67	67	66	64	63	63	62	62	62	61	61	62	63	63	63	64	65	66	67

	Clearer (%)	Cloudier (%)
1	32	68
2	32	68
3	32	68
4	32	68
5	32	68
6	32	68
7	32	68
8	31	69
9	31	69
10	32	68
11	33	67
12	33	67
13	33	67
14	34	66
15	36	64
16	37	63
17	37	63
18	38	62
19	38	62
20	38	62
21	39	61
22	39	61
23	38	62
24	37	63
25	37	63
26	37	63
27	36	64
28	35	65
29	34	66
30	33	67

Chance of precipitation in April

Any precipitationSnow

Ostrov gets around 47 mm of rain and snow over 11.4 wet days in April. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable precipitation averages around 38% and peaks near 43% on the wettest days, and about 2 days bring snow. The odds climb toward the end of the month.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Rain chance (%)	35	35	35	35	35	36	36	37	37	38	38	38	38	38	38	38	38	39	39	39	39	39	39	40	40	40	41	41	42	43
Snow chance (%)	12	11	11	10	10	9	9	9	9	8	8	8	8	8	8	7	7	7	6	6	5	4	4	3	3	2	2	2	2	1

	Rain chance (%)	Snow chance (%)
1	35	12
2	35	11
3	35	11
4	35	10
5	35	10
6	36	9
7	36	9
8	37	9
9	37	9
10	38	8
11	38	8
12	38	8
13	38	8
14	38	8
15	38	8
16	38	7
17	38	7
18	39	7
19	39	6
20	39	6
21	39	5
22	39	4
23	39	4
24	40	3
25	40	3
26	40	2
27	41	2
28	41	2
29	42	2
30	43	1

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 100% of days. It rarely turns muggy — the humid and sticky bands barely register.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Dry (%)	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100

	Dry (%)
1	100
2	100
3	100
4	100
5	100
6	100
7	100
8	100
9	100
10	100
11	100
12	100
13	100
14	100
15	100
16	100
17	100
18	100
19	100
20	100
21	100
22	100
23	100
24	100
25	100
26	100
27	100
28	100
29	100
30	100

Wind in April

Winds average 11 km/h in April.

Across April, daily wind ranges from about 10 km/h on the calmest days to 11 km/h at its breeziest. It stays fairly steady from day to day.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Wind speed (km/h)	11	11	11	11	11	11	11	11	11	11	11	11	11	11	11	11	11	11	10	10	10	10	10	10	10	10	10	10	10	10
Feels	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm

	Wind speed (km/h)	Feels
1	11	calm
2	11	calm
3	11	calm
4	11	calm
5	11	calm
6	11	calm
7	11	calm
8	11	calm
9	11	calm
10	11	calm
11	11	calm
12	11	calm
13	11	calm
14	11	calm
15	11	calm
16	11	calm
17	11	calm
18	11	calm
19	10	calm
20	10	calm
21	10	calm
22	10	calm
23	10	calm
24	10	calm
25	10	calm
26	10	calm
27	10	calm
28	10	calm
29	10	calm
30	10	calm

Sunrise & sunset in April

DaylightNight

Daylight runs from about 12 h 36 min at the start of April to 14 h 24 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 108 minutes over April. Sunrise moves from 5:56 AM to 4:55 AM, and sunset from 6:30 PM to 7:16 PM.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Daylight (h)	12.6	12.6	12.7	12.8	12.8	12.9	13.0	13.0	13.1	13.1	13.2	13.3	13.3	13.4	13.5	13.5	13.6	13.6	13.7	13.8	13.8	13.9	13.9	14.0	14.1	14.1	14.2	14.2	14.3	14.4
Sunrise (AM)	5:56	5:54	5:51	5:49	5:47	5:45	5:42	5:40	5:38	5:36	5:34	5:31	5:29	5:27	5:25	5:23	5:21	5:19	5:17	5:14	5:12	5:10	5:08	5:06	5:04	5:02	5:00	4:58	4:57	4:55
Sunset (PM)	6:30	6:31	6:33	6:35	6:36	6:38	6:40	6:41	6:43	6:44	6:46	6:48	6:49	6:51	6:52	6:54	6:56	6:57	6:59	7:01	7:02	7:04	7:05	7:07	7:09	7:10	7:12	7:13	7:15	7:16

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	12.6	5:56	6:30
2	12.6	5:54	6:31
3	12.7	5:51	6:33
4	12.8	5:49	6:35
5	12.8	5:47	6:36
6	12.9	5:45	6:38
7	13.0	5:42	6:40
8	13.0	5:40	6:41
9	13.1	5:38	6:43
10	13.1	5:36	6:44
11	13.2	5:34	6:46
12	13.3	5:31	6:48
13	13.3	5:29	6:49
14	13.4	5:27	6:51
15	13.5	5:25	6:52
16	13.5	5:23	6:54
17	13.6	5:21	6:56
18	13.6	5:19	6:57
19	13.7	5:17	6:59
20	13.8	5:14	7:01
21	13.8	5:12	7:02
22	13.9	5:10	7:04
23	13.9	5:08	7:05
24	14.0	5:06	7:07
25	14.1	5:04	7:09
26	14.1	5:02	7:10
27	14.2	5:00	7:12
28	14.2	4:58	7:13
29	14.3	4:57	7:15
30	14.4	4:55	7:16

Solar energy in April

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in April, about 4.46 kWh/m².

For context, solar energy here swings from a low near 0.73 kWh/m² to a high of 5.4 kWh/m² in June across the year — April's 4.46 kWh/m² falls in the middle.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Solar energy (kWh/m²)	3.8	3.8	3.9	3.9	4.0	4.0	4.0	4.1	4.1	4.2	4.2	4.3	4.3	4.4	4.4	4.5	4.5	4.6	4.6	4.7	4.7	4.7	4.8	4.8	4.8	4.8	4.8	4.9	4.9	4.9
Level	Moderate	Moderate	Moderate	Moderate	Moderate	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright

	Solar energy (kWh/m²)	Level
1	3.8	Moderate
2	3.8	Moderate
3	3.9	Moderate
4	3.9	Moderate
5	4.0	Moderate
6	4.0	Bright
7	4.0	Bright
8	4.1	Bright
9	4.1	Bright
10	4.2	Bright
11	4.2	Bright
12	4.3	Bright
13	4.3	Bright
14	4.4	Bright
15	4.4	Bright
16	4.5	Bright
17	4.5	Bright
18	4.6	Bright
19	4.6	Bright
20	4.7	Bright
21	4.7	Bright
22	4.7	Bright
23	4.8	Bright
24	4.8	Bright
25	4.8	Bright
26	4.8	Bright
27	4.8	Bright
28	4.9	Bright
29	4.9	Bright
30	4.9	Bright

Planning a trip in April

Is April a good time to visit Ostrov?

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

2.8

Sightseeing

6th-best month of the year

0.0

Beach & pool

6th-best month of the year

April is a weaker month for outdoor sightseeing in Ostrov.

What to pack for Ostrov in April

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

In April, Ostrov sees daytime highs around 11°C and nights near 2°C. Pack a warm layer. Worth having: rain gear. About 11 days see rain.

a warm layerrain gear

UV index in Ostrov in April

LowModerateHighVery highExtreme

Clear-sky midday UV in April peaks around 4 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Ostrov peaks around June 22 at about 7 (very high) — sunscreen and a hat are worth it in the middle of the day. It bottoms out near January 1 at about 1 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 7 months of the year.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
UV index (midday)	1	2	4	4	6	7	7	7	4	3	1	1
Level	Low	Low	Moderate	Moderate	High	Very high	Very high	High	Moderate	Moderate	Low	Low

	UV index (midday)	Level
Jan	1	Low
Feb	2	Low
Mar	4	Moderate
Apr	4	Moderate
May	6	High
Jun	7	Very high
Jul	7	Very high
Aug	7	High
Sep	4	Moderate
Oct	3	Moderate
Nov	1	Low
Dec	1	Low

Air quality in Ostrov 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 Ostrov is worst in April — around 18 µg/m³ PM2.5 (moderate), about 1.7× the cleanest month (December, 11 µg/m³).

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

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
PM2.5 (µg/m³)	13	14	17	18	16	18	16	16	16	13	12	11
Level	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Good	Good

	PM2.5 (µg/m³)	Level
Jan	13	Moderate
Feb	14	Moderate
Mar	17	Moderate
Apr	18	Moderate
May	16	Moderate
Jun	18	Moderate
Jul	16	Moderate
Aug	16	Moderate
Sep	16	Moderate
Oct	13	Moderate
Nov	12	Good
Dec	11	Good

Location & terrain

Where is Ostrov?

Ostrov sits at 50.3°N, 12.9°E, 398 m above sea level, in Czechia. The nearest listed city is Karlovy Vary, 9.0 km away.

Topography around Ostrov

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Ostrov.

Within 3 km, the terrain around Ostrov has only modest variations in elevation — a maximum elevation change of 239 m around an average of 441 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 947 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,205 m.

The land around Ostrov is covered by trees (41%), grassland (26%) and cropland (22%) within 3 km, trees (71%) and grassland (22%) within 16 km, and trees (48%) and cropland (30%) within 80 km.

3 km

239 m

trees 41%

16 km

947 m

trees 71%

80 km

1,205 m

trees 48%

treesgrasslandcroplandartificial surfaceswater

← March Ostrov year-round climate May →Best places to visit in April

April weather nearby: Karlovy Vary 9.0 km · Kadaň 25 km · Sokolov 25 km · Schwarzenberg 28 km · Annaberg-Buchholz 31 km · Aue 36 km · Chomutov 38 km · Schneeberg 38 km

Czechia travel facts

Travel advisory: Level 1; Exercise Normal Precautions
Power plugs: Type C / E; 230 V · 50 Hz
Prices: ≈ 59% of US; price level, 2025
GDP per capita: $35,917; 2025
Happiness: 6.8 / 10; World Happiness, 2025
Safe drinking water: 98%; of population, 2024
Homicide rate: 0.8; per 100k, 2023
Road deaths: 5.9; per 100k/yr, 2019
Income group: High; World Bank
English: High; EF EPI 582
Religion

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 Ostrov (50.3059°, 12.9391°, elevation 398 m), 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).

	Avg high (°C)	Avg low (°C)
1	9	0
2	9	1
3	9	1
4	9	1
5	9	1
6	10	1
7	10	1
8	10	1
9	10	1
10	10	1
11	10	1
12	10	2
13	11	2
14	11	2
15	11	2
16	11	2
17	12	2
18	12	3
19	12	3
20	12	3
21	13	3
22	13	3
23	13	4
24	13	4
25	14	4
26	14	4
27	14	4
28	14	5
29	14	5
30	15	5

	Clearer (%)	Cloudier (%)
1	32	68
2	32	68
3	32	68
4	32	68
5	32	68
6	32	68
7	32	68
8	31	69
9	31	69
10	32	68
11	33	67
12	33	67
13	33	67
14	34	66
15	36	64
16	37	63
17	37	63
18	38	62
19	38	62
20	38	62
21	39	61
22	39	61
23	38	62
24	37	63
25	37	63
26	37	63
27	36	64
28	35	65
29	34	66
30	33	67

	Rain chance (%)	Snow chance (%)
1	35	12
2	35	11
3	35	11
4	35	10
5	35	10
6	36	9
7	36	9
8	37	9
9	37	9
10	38	8
11	38	8
12	38	8
13	38	8
14	38	8
15	38	8
16	38	7
17	38	7
18	39	7
19	39	6
20	39	6
21	39	5
22	39	4
23	39	4
24	40	3
25	40	3
26	40	2
27	41	2
28	41	2
29	42	2
30	43	1

	Dry (%)
1	100
2	100
3	100
4	100
5	100
6	100
7	100
8	100
9	100
10	100
11	100
12	100
13	100
14	100
15	100
16	100
17	100
18	100
19	100
20	100
21	100
22	100
23	100
24	100
25	100
26	100
27	100
28	100
29	100
30	100

	Avg high (°C)	Avg low (°C)
1	9	0
2	9	1
3	9	1
4	9	1
5	9	1
6	10	1
7	10	1
8	10	1
9	10	1
10	10	1
11	10	1
12	10	2
13	11	2
14	11	2
15	11	2
16	11	2
17	12	2
18	12	3
19	12	3
20	12	3
21	13	3
22	13	3
23	13	4
24	13	4
25	14	4
26	14	4
27	14	4
28	14	5
29	14	5
30	15	5

	Clearer (%)	Cloudier (%)
1	32	68
2	32	68
3	32	68
4	32	68
5	32	68
6	32	68
7	32	68
8	31	69
9	31	69
10	32	68
11	33	67
12	33	67
13	33	67
14	34	66
15	36	64
16	37	63
17	37	63
18	38	62
19	38	62
20	38	62
21	39	61
22	39	61
23	38	62
24	37	63
25	37	63
26	37	63
27	36	64
28	35	65
29	34	66
30	33	67

	Rain chance (%)	Snow chance (%)
1	35	12
2	35	11
3	35	11
4	35	10
5	35	10
6	36	9
7	36	9
8	37	9
9	37	9
10	38	8
11	38	8
12	38	8
13	38	8
14	38	8
15	38	8
16	38	7
17	38	7
18	39	7
19	39	6
20	39	6
21	39	5
22	39	4
23	39	4
24	40	3
25	40	3
26	40	2
27	41	2
28	41	2
29	42	2
30	43	1

	Dry (%)
1	100
2	100
3	100
4	100
5	100
6	100
7	100
8	100
9	100
10	100
11	100
12	100
13	100
14	100
15	100
16	100
17	100
18	100
19	100
20	100
21	100
22	100
23	100
24	100
25	100
26	100
27	100
28	100
29	100
30	100

	Avg high (°C)	Avg low (°C)
1	9	0
2	9	1
3	9	1
4	9	1
5	9	1
6	10	1
7	10	1
8	10	1
9	10	1
10	10	1
11	10	1
12	10	2
13	11	2
14	11	2
15	11	2
16	11	2
17	12	2
18	12	3
19	12	3
20	12	3
21	13	3
22	13	3
23	13	4
24	13	4
25	14	4
26	14	4
27	14	4
28	14	5
29	14	5
30	15	5

	Clearer (%)	Cloudier (%)
1	32	68
2	32	68
3	32	68
4	32	68
5	32	68
6	32	68
7	32	68
8	31	69
9	31	69
10	32	68
11	33	67
12	33	67
13	33	67
14	34	66
15	36	64
16	37	63
17	37	63
18	38	62
19	38	62
20	38	62
21	39	61
22	39	61
23	38	62
24	37	63
25	37	63
26	37	63
27	36	64
28	35	65
29	34	66
30	33	67

	Rain chance (%)	Snow chance (%)
1	35	12
2	35	11
3	35	11
4	35	10
5	35	10
6	36	9
7	36	9
8	37	9
9	37	9
10	38	8
11	38	8
12	38	8
13	38	8
14	38	8
15	38	8
16	38	7
17	38	7
18	39	7
19	39	6
20	39	6
21	39	5
22	39	4
23	39	4
24	40	3
25	40	3
26	40	2
27	41	2
28	41	2
29	42	2
30	43	1

	Dry (%)
1	100
2	100
3	100
4	100
5	100
6	100
7	100
8	100
9	100
10	100
11	100
12	100
13	100
14	100
15	100
16	100
17	100
18	100
19	100
20	100
21	100
22	100
23	100
24	100
25	100
26	100
27	100
28	100
29	100
30	100