Switzerland · 1991–2020

Best time to visit
Thônex.

June leads for comfortable weather in Thônex: typically 24.2°C by day, 13°C at night, with 81 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortJune

Typical high24.2°C

Typical low13°C

Rain in June81 mm

Comfort

June

June · August · July

84climate match

Beach

July

July · August · June

63climate match

Outdoors

May

May · September · April

83climate match

The weakest month is January, scoring 5 against June’s 84 — days reach only 5.1°C, 19° 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

55.1° / -0.8°

Feb

87° / -0.9°

Mar

2811.9° / 1.9°

Apr

4716° / 5.2°

May

6520.1° / 9.3°

Jun

8424.2° / 13°

Jul

8026.7° / 14.8°

Aug

8126.3° / 14.4°

Sep

7121.2° / 10.9°

Oct

4415.6° / 7.4°

Nov

169.4° / 2.8°

Dec

55.7° / 0°

Monthly climate evidence for Thônex — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	5.1°C	-0.8°C	71 mm	9.4	8 h 59	5	Strong coverage
February	7°C	-0.9°C	55 mm	7.9	10 h 15	8	Strong coverage
March	11.9°C	1.9°C	61 mm	8.1	11 h 45	28	Strong coverage
April	16°C	5.2°C	65 mm	8.6	13 h 29	47	Strong coverage
May	20.1°C	9.3°C	77 mm	10.2	14 h 56	65	Strong coverage
June	24.2°C	13°C	81 mm	9	15 h 45	84	Strong coverage
July	26.7°C	14.8°C	77 mm	8	15 h 26	80	Strong coverage
August	26.3°C	14.4°C	80 mm	7.8	14 h 10	81	Strong coverage
September	21.2°C	10.9°C	87 mm	8.3	12 h 29	71	Strong coverage
October	15.6°C	7.4°C	94 mm	9.7	10 h 50	44	Strong coverage
November	9.4°C	2.8°C	87 mm	9.9	9 h 22	16	Strong coverage
December	5.7°C	0°C	88 mm	10.3	8 h 38	5	Strong coverage

What has changed

Thônex 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

+2.6

Feb

+2.0

Mar

+2.7

Apr

+2.7

May

+1.7

Jun

+3.1

Jul

+2.2

Aug

+2.9

Sep

+1.2

Oct

+1.5

Nov

+1.6

Dec

+2.1

June daytime highs, 2011–2025. Last recorded: 28.6°C.

Records at GENEVE COINTRIN, 1955–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	18.1°C25 Jan 2025	-19.9°C13 Jan 1968	57 mm27 Jan 1979	196 mm1979 · driest 8 mm in 1989	72
February	20.1°C28 Feb 2019	-20.0°C15 Feb 1956	53 mm4 Feb 1976	190 mm1970 · driest 0 mm in 2012	72
March	24.9°C22 Mar 1990	-13.3°C4 Mar 1965	53 mm8 Mar 2001	282 mm2001 · driest 5 mm in 1990	72
April	28.3°C14 Apr 2024	-5.2°C6 Apr 1970	56 mm9 Apr 2006	145 mm1970 · driest 3 mm in 1982	72
May	33.8°C24 May 2009	-2.2°C8 May 1957	55 mm15 May 1983	191 mm1983 · driest 12 mm in 2022	72
June	36.5°C25 Jun 2003	1.3°C4 Jun 1962	68 mm21 Jun 1997	196 mm1987 · driest 2 mm in 1976	71
July	39.7°C7 Jul 2015	3.0°C7 Jul 1962	73 mm28 Jul 2013	176 mm2014 · driest 5 mm in 2022	71
August	39.3°C24 Aug 2023	4.9°C31 Aug 1986	76 mm7 Aug 1978	247 mm1968 · driest 5 mm in 1991	71
September	32.6°C3 Sep 1962	0.2°C30 Sep 1972	85 mm9 Sep 1993	272 mm1993 · driest 6 mm in 1985	71
October	27.3°C6 Oct 1977	-4.7°C31 Oct 1997	70 mm7 Oct 2014	213 mm2004 · driest 2 mm in 1969	71
November	22.1°C2 Nov 2020	-10.9°C27 Nov 1989	93 mm14 Nov 2002	295 mm2002 · driest 6 mm in 1978	71
December	19.9°C17 Dec 1989	-17.0°C30 Dec 1964	50 mm21 Dec 1991	199 mm1981 · driest 0 mm in 2016	71

Typical days per month at GENEVE COINTRIN, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)
January	0	0	19	3
February	0	0	18	2
March	0	0	9	2
April	<1	0	2	2
May	5	<1	<1	3
June	14	4	0	3
July	21	7	0	3
August	19	7	0	3
September	6	<1	0	3
October	<1	0	<1	3
November	0	0	7	3
December	0	0	15	3

The best month has moved. On the 1961–1990 numbers the strongest month here was July (scoring 87); on 2011–2025 it is June (86). Both are scored the same way, from the same station — only the climate underneath changed.

How often, not how much — every day in GENEVE COINTRIN’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%	34%	9%	40%	1.8–7.2°C
February	<1%	32%	9%	41%	3.3–10.1°C
March	2%	31%	8%	38%	8.1–13.8°C
April	15%	31%	6%	37%	12.3–17.6°C
May	35%	36%	9%	45%	16.8–21.8°C
June	56%	33%	11%	39%	21.0–26.3°C
July	70%	27%	9%	28%	23.5–29.2°C
August	67%	28%	9%	32%	22.8–28.2°C
September	47%	29%	10%	33%	18.1–23.4°C
October	10%	32%	10%	38%	13.0–17.8°C
November	<1%	35%	11%	44%	6.9–10.8°C
December	0%	35%	11%	44%	3.1–7.5°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.

1955Each stripe is one year’s mean temperature against the 69-year average. Warmest: 2022. Coolest: 1956.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 3209505
NOAA station: SZ000008440 · GENEVE COINTRIN
Station distance: 8.5 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 29 usable years
Daylight: Calculated from latitude 46.19°, mid-month, sunrise to sunset including refraction. Not a station measurement.
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 GENEVE COINTRIN is what differs

Geneva→Annecy→Thonon-les-Bains→Vernier→Annemasse→Lancy→

Or put two places side by side: Thônex vs Geneva

Best time to visitThônex.

June

July

May

The whole year,without the guesswork.

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

Nearby, measured,and named.

Best time to visit
Thônex.

The whole year,
without the guesswork.

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

Nearby, measured,
and named.