Ostrołęka weather in April

In April, Ostrołęka sees average daytime highs of 13°C and overnight lows near 3°C, with 44 mm of precipitation across 10.1 wet days and about 13.6 hours of daylight. It is the 6th-warmest and 7th-wettest month of the year here.

Highs climb over the month, from about 10°C in the first days to 16°C by the end. The sky is clear or mostly clear about 24% 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 36 min by month's end. Set against the rest of the year, April is Ostrołęka's 4th-clearest and 7th-windiest month. For the whole year in context, see Ostrołęka's year-round climate.

Daytime high: 13°; 6th warmest
Overnight low: 3°; 6th coldest
Precipitation: 44 mm; 10.1 wet days
Daylight: 13 h 42 min; 4:43 AM – 6:24 PM
Cloud cover: 63%; 4th clearest
Wind: 12 km/h; 7th windiest
Solar energy: 4.2 kWh/m²
Travel score: 3.6; out of 10

Ostrołęka is city with powiat rights of Poland.

Density: 1,919/km²; people per km²
Founded: 1050

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

← March Ostrołęka 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 10°C in the first days to 16°C by the end.

A typical April day in Ostrołęka reaches about 13°C in the afternoon and slips back to 3°C overnight — a 10°C spread between the day's warmth and the night's chill. On most days the high lands between 7°C and 20°C. Set against its neighbours, April runs about 7°C warmer than March and about 6°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)	10	10	10	10	11	11	11	11	11	11	12	12	12	12	13	13	13	14	14	14	14	15	15	15	16	16	16	16	17	17
Avg low (°C)	1	1	1	1	2	2	2	2	2	2	2	3	3	3	3	3	3	4	4	4	4	4	5	5	5	5	5	6	6	6

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

How April really feels in Ostrołęka

Once humidity and wind are folded in, April averages 0 days that feel above 32°C and 16 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.

Ostrołęka weather by month

How April compares with the rest of the year at a glance. April is the 6th-warmest and 7th-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°	39	10.3	6.3	7.9	0.0
Feb	2° / -4°	36	9.1	5.5	9.5	0.0
Mar	6° / -1°	39	10	3.2	11.5	0.6
Apr	13° / 3°	44	10.1	0.9	13.6	3.6
May	19° / 8°	66	11.9	0	15.5	5.7
Jun	22° / 11°	70	11.8	0	16.6	6.2
Jul	24° / 14°	79	12.2	0	16.2	6.6
Aug	23° / 13°	62	10.6	0	14.5	6.7
Sep	18° / 9°	57	9.7	0	12.4	5.7
Oct	12° / 5°	47	9.6	0.3	10.3	3.1
Nov	6° / 1°	39	9.6	2.5	8.4	0.4
Dec	2° / -3°	42	9.7	4.7	7.4	0.0

Cloud cover in April

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 24% of the time in April.

Beyond those clear spells, partly cloudy skies cover about 16% of April, with mostly cloudy or overcast conditions the remaining 60%. Skies tend to open up as the month goes on.

	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 (%)	34	33	33	33	32	32	32	32	32	32	32	33	36	36	37	40	41	42	45	45	47	48	49	50	50	50	50	49	50	49
Cloudier (%)	66	67	67	67	68	68	68	68	68	68	68	67	64	64	63	60	59	58	55	55	53	52	51	50	50	50	50	51	50	51

	Clearer (%)	Cloudier (%)
1	34	66
2	33	67
3	33	67
4	33	67
5	32	68
6	32	68
7	32	68
8	32	68
9	32	68
10	32	68
11	32	68
12	33	67
13	36	64
14	36	64
15	37	63
16	40	60
17	41	59
18	42	58
19	45	55
20	45	55
21	47	53
22	48	52
23	49	51
24	50	50
25	50	50
26	50	50
27	50	50
28	49	51
29	50	50
30	49	51

Chance of precipitation in April

Any precipitationSnow

Ostrołęka gets around 44 mm of rain and snow over 10.1 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 34% and peaks near 37% on the wettest days, and about 1 day brings snow.

	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 (%)	30	30	31	32	32	33	34	35	36	36	37	37	37	37	37	36	36	35	35	34	33	33	33	32	32	32	32	32	32	32
Snow chance (%)	6	6	6	6	6	6	5	5	5	4	4	4	4	3	3	3	2	2	2	2	1	1	1	1	1	1	0	0	0	0

	Rain chance (%)	Snow chance (%)
1	30	6
2	30	6
3	31	6
4	32	6
5	32	6
6	33	6
7	34	5
8	35	5
9	36	5
10	36	4
11	37	4
12	37	4
13	37	4
14	37	3
15	37	3
16	36	3
17	36	2
18	35	2
19	35	2
20	34	2
21	33	1
22	33	1
23	33	1
24	32	1
25	32	1
26	32	1
27	32	0
28	32	0
29	32	0
30	32	0

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	99
Comfortable (%)	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	1

	Dry (%)	Comfortable (%)
1	100	0
2	100	0
3	100	0
4	100	0
5	100	0
6	100	0
7	100	0
8	100	0
9	100	0
10	100	0
11	100	0
12	100	0
13	100	0
14	100	0
15	100	0
16	100	0
17	100	0
18	100	0
19	100	0
20	100	0
21	100	0
22	100	0
23	100	0
24	100	0
25	100	0
26	100	0
27	100	0
28	100	0
29	100	0
30	99	1

Wind in April

Winds average 12 km/h in April.

Across April, daily wind ranges from about 12 km/h on the calmest days to 13 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)	13	13	13	13	13	13	13	13	13	13	13	13	13	13	13	13	12	12	12	12	12	12	12	12	12	12	12	12	12	12
Feels	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	calm	calm	calm

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

Sunrise & sunset in April

DaylightNight

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

Days grow by about 120 minutes over April. Sunrise moves from 5:20 AM to 4:12 AM, and sunset from 5:57 PM to 6:50 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	12.7	12.8	12.8	12.9	13.0	13.1	13.1	13.2	13.3	13.3	13.4	13.5	13.5	13.6	13.7	13.8	13.8	13.9	14.0	14.0	14.1	14.2	14.2	14.3	14.4	14.4	14.5	14.6	14.6
Sunrise (AM)	5:20	5:17	5:15	5:12	5:10	5:07	5:05	5:02	5:00	4:58	4:55	4:53	4:51	4:48	4:46	4:43	4:41	4:39	4:37	4:34	4:32	4:30	4:27	4:25	4:23	4:21	4:19	4:17	4:14	4:12
Sunset (PM)	5:57	5:59	6:01	6:03	6:04	6:06	6:08	6:10	6:12	6:13	6:15	6:17	6:19	6:21	6:23	6:24	6:26	6:28	6:30	6:32	6:33	6:35	6:37	6:39	6:41	6:42	6:44	6:46	6:48	6:50

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	12.6	5:20	5:57
2	12.7	5:17	5:59
3	12.8	5:15	6:01
4	12.8	5:12	6:03
5	12.9	5:10	6:04
6	13.0	5:07	6:06
7	13.1	5:05	6:08
8	13.1	5:02	6:10
9	13.2	5:00	6:12
10	13.3	4:58	6:13
11	13.3	4:55	6:15
12	13.4	4:53	6:17
13	13.5	4:51	6:19
14	13.5	4:48	6:21
15	13.6	4:46	6:23
16	13.7	4:43	6:24
17	13.8	4:41	6:26
18	13.8	4:39	6:28
19	13.9	4:37	6:30
20	14.0	4:34	6:32
21	14.0	4:32	6:33
22	14.1	4:30	6:35
23	14.2	4:27	6:37
24	14.2	4:25	6:39
25	14.3	4:23	6:41
26	14.4	4:21	6:42
27	14.4	4:19	6:44
28	14.5	4:17	6:46
29	14.6	4:14	6:48
30	14.6	4:12	6:50

Solar energy in April

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in April, about 4.2 kWh/m².

For context, solar energy here swings from a low near 0.48 kWh/m² to a high of 5.46 kWh/m² in June across the year — April's 4.2 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)	3.4	3.5	3.5	3.6	3.6	3.6	3.7	3.7	3.8	3.8	3.9	4.0	4.0	4.1	4.2	4.2	4.3	4.4	4.4	4.5	4.6	4.6	4.7	4.7	4.8	4.8	4.8	4.9	4.9	4.9
Level	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright

	Solar energy (kWh/m²)	Level
1	3.4	Moderate
2	3.5	Moderate
3	3.5	Moderate
4	3.6	Moderate
5	3.6	Moderate
6	3.6	Moderate
7	3.7	Moderate
8	3.7	Moderate
9	3.8	Moderate
10	3.8	Moderate
11	3.9	Moderate
12	4.0	Moderate
13	4.0	Bright
14	4.1	Bright
15	4.2	Bright
16	4.2	Bright
17	4.3	Bright
18	4.4	Bright
19	4.4	Bright
20	4.5	Bright
21	4.6	Bright
22	4.6	Bright
23	4.7	Bright
24	4.7	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 Ostrołęka?

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

3.6

Sightseeing

6th-best month of the year

0.2

Beach & pool

6th-best month of the year

April is a weaker month for outdoor sightseeing in Ostrołęka.

What to pack for Ostrołęka in April

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

In April, Ostrołęka sees daytime highs around 13°C and nights near 3°C. Worth packing: a warm layer and rain gear. About 10 days see rain.

a warm layerrain gear

UV index in Ostrołęka 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 Ostrołęka peaks around June 20 at about 6 (high) — a little sun protection helps at midday. It bottoms out near December 19 at about 0 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 6 months of the year.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
UV index (midday)	1	1	3	4	5	6	6	6	4	2	1	0
Level	Low	Low	Moderate	Moderate	High	High	High	High	Moderate	Low	Low	Low

	UV index (midday)	Level
Jan	1	Low
Feb	1	Low
Mar	3	Moderate
Apr	4	Moderate
May	5	High
Jun	6	High
Jul	6	High
Aug	6	High
Sep	4	Moderate
Oct	2	Low
Nov	1	Low
Dec	0	Low

Location & terrain

Where is Ostrołęka?

Ostrołęka sits at 53.1°N, 21.6°E, 97 m above sea level, in Poland. The nearest listed city is Łomża, 34 km away.

Topography around Ostrołęka

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

Within 3 km, the terrain around Ostrołęka has only modest variations in elevation — a maximum elevation change of 32 m around an average of 100 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 58 m; within 80 km, only modest variations in elevation — a maximum elevation change of 168 m.

The land around Ostrołęka is covered by trees (39%), grassland (30%) and artificial surfaces (26%) within 3 km, trees (42%) and grassland (36%) within 16 km, and trees (39%), cropland (30%) and grassland (28%) within 80 km.

3 km

32 m

trees 39%

16 km

58 m

trees 42%

80 km

168 m

trees 39%

treesgrasslandcroplandartificial surfaceswaterwetland

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

April weather nearby: Łomża 34 km · Ostrów Mazowiecka 38 km · Zambrów 46 km · Przasnysz 47 km · Pułtusk 54 km · Wyszków 55 km · Pisz 62 km · Szczytno 66 km

Poland travel facts

Travel advisory: Level 1; Exercise Normal Precautions
Power plugs: Type C / E; 230 V · 50 Hz
Prices: ≈ 52% of US; price level, 2025
GDP per capita: $28,420; 2025
Happiness: 6.8 / 10; World Happiness, 2025
Safe drinking water: 89%; of population, 2024
Homicide rate: 0.8; per 100k, 2023
Road deaths: 9.4; per 100k/yr, 2019
Income group: High; World Bank
English: Very high; EF EPI 600
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 Ostrołęka (53.0862°, 21.5757°, elevation 97 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. 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	10	1
2	10	1
3	10	1
4	10	1
5	11	2
6	11	2
7	11	2
8	11	2
9	11	2
10	11	2
11	12	2
12	12	3
13	12	3
14	12	3
15	13	3
16	13	3
17	13	3
18	14	4
19	14	4
20	14	4
21	14	4
22	15	4
23	15	5
24	15	5
25	16	5
26	16	5
27	16	5
28	16	6
29	17	6
30	17	6

	Clearer (%)	Cloudier (%)
1	34	66
2	33	67
3	33	67
4	33	67
5	32	68
6	32	68
7	32	68
8	32	68
9	32	68
10	32	68
11	32	68
12	33	67
13	36	64
14	36	64
15	37	63
16	40	60
17	41	59
18	42	58
19	45	55
20	45	55
21	47	53
22	48	52
23	49	51
24	50	50
25	50	50
26	50	50
27	50	50
28	49	51
29	50	50
30	49	51

	Rain chance (%)	Snow chance (%)
1	30	6
2	30	6
3	31	6
4	32	6
5	32	6
6	33	6
7	34	5
8	35	5
9	36	5
10	36	4
11	37	4
12	37	4
13	37	4
14	37	3
15	37	3
16	36	3
17	36	2
18	35	2
19	35	2
20	34	2
21	33	1
22	33	1
23	33	1
24	32	1
25	32	1
26	32	1
27	32	0
28	32	0
29	32	0
30	32	0

	Dry (%)	Comfortable (%)
1	100	0
2	100	0
3	100	0
4	100	0
5	100	0
6	100	0
7	100	0
8	100	0
9	100	0
10	100	0
11	100	0
12	100	0
13	100	0
14	100	0
15	100	0
16	100	0
17	100	0
18	100	0
19	100	0
20	100	0
21	100	0
22	100	0
23	100	0
24	100	0
25	100	0
26	100	0
27	100	0
28	100	0
29	100	0
30	99	1

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

	Clearer (%)	Cloudier (%)
1	34	66
2	33	67
3	33	67
4	33	67
5	32	68
6	32	68
7	32	68
8	32	68
9	32	68
10	32	68
11	32	68
12	33	67
13	36	64
14	36	64
15	37	63
16	40	60
17	41	59
18	42	58
19	45	55
20	45	55
21	47	53
22	48	52
23	49	51
24	50	50
25	50	50
26	50	50
27	50	50
28	49	51
29	50	50
30	49	51

	Rain chance (%)	Snow chance (%)
1	30	6
2	30	6
3	31	6
4	32	6
5	32	6
6	33	6
7	34	5
8	35	5
9	36	5
10	36	4
11	37	4
12	37	4
13	37	4
14	37	3
15	37	3
16	36	3
17	36	2
18	35	2
19	35	2
20	34	2
21	33	1
22	33	1
23	33	1
24	32	1
25	32	1
26	32	1
27	32	0
28	32	0
29	32	0
30	32	0

	Dry (%)	Comfortable (%)
1	100	0
2	100	0
3	100	0
4	100	0
5	100	0
6	100	0
7	100	0
8	100	0
9	100	0
10	100	0
11	100	0
12	100	0
13	100	0
14	100	0
15	100	0
16	100	0
17	100	0
18	100	0
19	100	0
20	100	0
21	100	0
22	100	0
23	100	0
24	100	0
25	100	0
26	100	0
27	100	0
28	100	0
29	100	0
30	99	1

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

	Clearer (%)	Cloudier (%)
1	34	66
2	33	67
3	33	67
4	33	67
5	32	68
6	32	68
7	32	68
8	32	68
9	32	68
10	32	68
11	32	68
12	33	67
13	36	64
14	36	64
15	37	63
16	40	60
17	41	59
18	42	58
19	45	55
20	45	55
21	47	53
22	48	52
23	49	51
24	50	50
25	50	50
26	50	50
27	50	50
28	49	51
29	50	50
30	49	51

	Rain chance (%)	Snow chance (%)
1	30	6
2	30	6
3	31	6
4	32	6
5	32	6
6	33	6
7	34	5
8	35	5
9	36	5
10	36	4
11	37	4
12	37	4
13	37	4
14	37	3
15	37	3
16	36	3
17	36	2
18	35	2
19	35	2
20	34	2
21	33	1
22	33	1
23	33	1
24	32	1
25	32	1
26	32	1
27	32	0
28	32	0
29	32	0
30	32	0

	Dry (%)	Comfortable (%)
1	100	0
2	100	0
3	100	0
4	100	0
5	100	0
6	100	0
7	100	0
8	100	0
9	100	0
10	100	0
11	100	0
12	100	0
13	100	0
14	100	0
15	100	0
16	100	0
17	100	0
18	100	0
19	100	0
20	100	0
21	100	0
22	100	0
23	100	0
24	100	0
25	100	0
26	100	0
27	100	0
28	100	0
29	100	0
30	99	1