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Croatia · 1991–2020

Best time to visit
Hreljin.

May leads for comfortable weather in Hreljin: typically 22.4°C by day, 13.5°C at night, with 113 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortMay

Typical high22.4°C

Typical low13.5°C

Rain in May113 mm

Comfort

May

May · June · September

76climate match

Beach

July

July · August · June

85climate match

Outdoors

April

April · May · March

73climate match

The weakest month is December, scoring 13 against May’s 76 — days reach only 10.8°C, 13° below the 24°C the score treats as ideal.

Month by month

The whole year,
without the guesswork.

The bars show the comfort score. Day and night temperatures come from daily observed highs and lows; rain is the historical monthly estimate.

Jan

159.6° / 3.3°

Feb

1710.4° / 3.5°

Mar

3613.7° / 6.2°

Apr

5417.8° / 9.5°

May

7622.4° / 13.5°

Jun

7526.8° / 17.4°

Jul

6629.7° / 19.6°

Aug

6029.9° / 19.8°

Sep

7324.1° / 15.5°

Oct

4819.2° / 11.6°

Nov

2414.4° / 8°

Dec

1310.8° / 4.4°

Monthly climate evidence for Hreljin — daylight is calculated from latitude, everything else is measured, sea temperature from the nearest open water 20 km away
Month	Day	Night	Rain	Wet days	Sea	Daylight	Comfort	Coverage
January	9.6°C	3.3°C	122 mm	7.7	10.4°C	9 h 05	15	Strong coverage
February	10.4°C	3.5°C	129 mm	7.3	9.7°C	10 h 19	17	Strong coverage
March	13.7°C	6.2°C	108 mm	7.2	10.0°C	11 h 46	36	Strong coverage
April	17.8°C	9.5°C	103 mm	9.4	12.3°C	13 h 26	54	Strong coverage
May	22.4°C	13.5°C	113 mm	8.5	16.7°C	14 h 51	76	Strong coverage
June	26.8°C	17.4°C	87 mm	7.6	20.9°C	15 h 38	75	Strong coverage
July	29.7°C	19.6°C	67 mm	6	23.2°C	15 h 19	66	Strong coverage
August	29.9°C	19.8°C	96 mm	6.7	23.4°C	14 h 06	60	Strong coverage
September	24.1°C	15.5°C	180 mm	8.6	20.5°C	12 h 28	73	Strong coverage
October	19.2°C	11.6°C	205 mm	10.1	18.0°C	10 h 52	48	Strong coverage
November	14.4°C	8°C	211 mm	10.9	15.3°C	9 h 27	24	Strong coverage
December	10.8°C	4.4°C	168 mm	9.3	12.4°C	8 h 45	13	Strong coverage

What has changed

Hreljin runs +2.2°C
on the 1961–1990 baseline.

Each bar compares the 2011–2025 daytime average for that month against the same month in 1961–1990, measured at the same station. Months where the older record is too thin to compare are left blank.

Jan

+1.7

Feb

+1.6

Mar

+2.3

Apr

+2.4

May

+1.6

Jun

+3.6

Jul

+3.1

Aug

+3.5

Sep

+1.6

Oct

+1.3

Nov

+2.0

Dec

+2.2

May daytime highs, 2011–2023. Last recorded: 22.5°C.

Records at RIJEKA, 1948–2023
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	20.0°C20 Jan 1974	-11.4°C9 Jan 1985	120 mm25 Jan 2001	394 mm1979 · driest 1 mm in 1989	75
February	24.9°C24 Feb 2021	-12.8°C10 Feb 1956	136 mm17 Feb 1960	408 mm2016 · driest 0 mm in 1998	76
March	25.0°C29 Mar 2017	-7.7°C5 Mar 1971	113 mm16 Mar 2011	406 mm2013 · driest 0 mm in 1973	76
April	28.9°C28 Apr 2012	-1.2°C7 Apr 2021	109 mm30 Apr 1959	238 mm1970 · driest 1 mm in 2007	76
May	33.7°C25 May 2009	2.1°C12 May 1978	103 mm25 May 1948	310 mm1995 · driest 2 mm in 1993	76
June	38.4°C28 Jun 2022	7.4°C8 Jun 1962	94 mm14 Jun 1963	233 mm1948 · driest 5 mm in 2021	76
July	40.0°C19 Jul 2007	10.4°C16 Jul 1970	98 mm28 Jul 1952	199 mm1960 · driest 2 mm in 2012	76
August	39.5°C5 Aug 2017	9.1°C28 Aug 1995	205 mm20 Aug 1981	351 mm1981 · driest 3 mm in 2011	76
September	34.8°C4 Sep 1949	4.8°C29 Sep 1977	288 mm28 Sep 2022	602 mm2022 · driest 17 mm in 1980	76
October	28.8°C1 Oct 1956	-1.2°C30 Oct 2012	200 mm18 Oct 1998	508 mm1998 · driest 0 mm in 1965	76
November	25.5°C2 Nov 2004	-4.5°C15 Nov 1983	153 mm23 Nov 1987	487 mm2016 · driest 19 mm in 2011	76
December	20.4°C4 Dec 1979	-8.9°C28 Dec 1996	111 mm6 Dec 2010	455 mm1976 · driest 0 mm in 2015	76

Typical days per month at RIJEKA, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)
January	0	0	6	4
February	0	0	5	4
March	0	0	1	3
April	1	0	<1	3
May	8	<1	0	3
June	20	7	0	3
July	28	16	0	2
August	28	16	0	3
September	12	2	0	5
October	1	0	0	5
November	0	0	<1	6
December	0	0	4	5

The best month has moved. On the 1961–1990 numbers the strongest month here was June (scoring 86); on 2011–2025 it is May (79). Both are scored the same way, from the same station — only the climate underneath changed.

How often, not how much — every day in RIJEKA’s record sorted by what it was actually like, rather than averaged
Month	Warm & dry days	Wet days	Washouts	Week with 3+ wet days	Daytime mean has ranged
January	0%	28%	13%	34%	7.0–11.1°C
February	<1%	27%	14%	34%	7.2–12.2°C
March	4%	25%	11%	31%	10.5–15.7°C
April	20%	31%	12%	39%	14.9–18.9°C
May	55%	29%	11%	34%	19.2–24.0°C
June	71%	27%	11%	31%	23.4–28.1°C
July	79%	21%	8%	19%	26.0–31.2°C
August	77%	22%	10%	25%	25.9–31.4°C
September	68%	27%	15%	34%	21.7–26.2°C
October	31%	30%	15%	37%	17.3–20.6°C
November	2%	34%	18%	45%	12.1–15.8°C
December	0%	30%	16%	40%	8.6–12.2°C

A warm and dry day reaches 20°C with under 1 mm of rain; a wet day gets 1 mm or more; a washout gets 10 mm or more. The week column is the share of seven-day stretches in that month, across the station’s whole daily record, that contained three or more wet days — the odds a week-long trip is rained on repeatedly, counted rather than modelled. The last column is the 10th to 90th percentile of that month’s daytime average across individual years: a narrow band means the average is what you will get, a wide one means the average is a midpoint between years that felt quite different.

1949Each stripe is one year’s mean temperature against the 75-year average. Warmest: 2022. Coolest: 1980.2023

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 3199279
NOAA station: HRE00105210 · RIJEKA
Station distance: 13 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 30 usable years
Daylight: Calculated from latitude 45.28°, mid-month, sunrise to sunset including refraction. Not a station measurement.
Sea temperature: NOAA OISST v2.1 1991–2020 monthly climatology, nearest open water 20 km from the place centre. A sheltered bay can run warmer than the open sea it is measured from.
Important limit: Historical climate is not a forecast. Nearby stations can miss mountains, coasts, and local microclimates.

These places read the same station, so their numbers are identical — distance from RIJEKA is what differs

Rijeka→Pula→Kastav→Drenova→Crikvenica→Labin→

Or put two places side by side: Hreljin vs Rijeka

Best time to visitHreljin.

May

July

April

The whole year,without the guesswork.

Hreljin runs +2.2°Con the 1961–1990 baseline.

Nearby, measured,and named.

Best time to visit
Hreljin.

The whole year,
without the guesswork.

Hreljin runs +2.2°C
on the 1961–1990 baseline.

Nearby, measured,
and named.