Question 1

What were the temperature extremes in Geneva in 2025?

Accepted Answer

In 2025, Geneva swung from a high of 36.4°C (97.5°F) on August 9 to a low of -9.8°C (14.4°F) on January 15, giving the city an annual temperature range of 46.2°C (83.2°F).

The hottest stretch came in summer, with the August 9 peak marking the warmest day of the year. Across 2025, Geneva recorded 35 days that reached at least 30°C (86°F), and 4 of those climbed to 35°C (95°F) or higher. June was the warmest month overall, averaging 21.9°C (71.4°F).

Winter delivered the opposite extreme. The coldest reading of -9.8°C (14.4°F) arrived in mid-January, and Geneva logged 71 days with a minimum at or below freezing (0°C / 32°F) over the course of the year. January was the coldest month, with a mean temperature of just 3.0°C (37.4°F).

Taken together, these figures put Geneva's 2025 annual mean temperature at 11.6°C (52.9°F), a middle-ground average that masks the wide seasonal spread.

For visitors, this means packing for genuine extremes: lightweight, sun-ready clothing for the frequent 30°C-plus summer afternoons, and warm layers for the sub-zero nights common in deep winter. The 35 hot days make summer ideal for lake activities along Lake Geneva, while the 71 frost days are a reminder that winter mornings can be sharply cold.

Question 2

What is the sunniest time of year in Geneva?

Accepted Answer

The sunniest time of year in Geneva is summer, with August 2025 being the brightest month of all. Across the meteorological summer (June to August 2025), Geneva recorded 1,087.6 hours of sunshine — roughly 41% of the city's entire annual total.

August 2025 led the year with 378.3 sunshine hours, averaging about 12.2 hours of sun per day. June and August were nearly identical, with daily averages of 12.1 and 12.2 hours respectively, while July delivered 11.2 hours per day. For the full year, Geneva accumulated 2,625.8 hours of sunshine in 2025, an average of about 7.2 hours per day.

The contrast with winter is striking. December 2025 was the dullest month, with just 75.0 sunshine hours — only 2.4 hours per day, less than a fifth of August's daily total. Summer was also relatively dry: August saw only 76.5 mm (3.0 inches) of precipitation despite its long, sunny days.

For visitors and residents, these 2025 figures confirm that June through August is the prime window for outdoor activities in Geneva — lakeside walks, boat trips on Lake Geneva, and alpine excursions from the city's 376 m elevation. If you want reliable sunshine, plan your Geneva trip for high summer and avoid the grey, short days of December.

Question 3

Which season was the wettest in Geneva in 2025?

Accepted Answer

Autumn was the wettest season in Geneva in 2025, with September to November (autumn, SON) delivering roughly 566 mm (22.3 in) of rainfall — far more than any other season.

By comparison, the other meteorological seasons in Geneva stayed well below that mark in 2025:

- **Autumn (September–November):** 566 mm (22.3 in)
- **Spring (March–May):** 265 mm (10.4 in)
- **Winter (January–February):** 249 mm (9.8 in)
- **Summer (June–August):** 242 mm (9.5 in)

November was the single wettest month of the year, recording 241 mm (9.5 in) of precipitation, while September and October added 167 mm (6.6 in) and 158 mm (6.2 in) respectively. That autumn surge alone accounted for more than 40% of Geneva's full-year total of about 1,365 mm (53.7 in). The driest month, by contrast, was March with just 42 mm (1.7 in).

For visitors and residents, this means autumn in Geneva is reliably the dampest stretch of the year, so it pays to pack waterproof layers and an umbrella between September and November. Spring and summer are noticeably drier in relative terms, making the warmer months a better bet for lake outings and outdoor plans around Geneva.

Question 4

What is the weather like in Geneva in July?

Accepted Answer

Geneva in July is warm and largely sunny, but the month can be surprisingly changeable, mixing hot summer spells with cooler, rainy interruptions. In July 2025, the city averaged a comfortable 20.9°C (69.6°F) across the month.

Daytime highs in Geneva averaged 27.3°C (81.2°F), while nights cooled to an average low of 14.1°C (57.4°F). The hottest day was 2 July 2025, when temperatures peaked at 35.0°C (95.0°F), and 9 of the 31 days climbed to at least 30°C (86°F). Sunshine was abundant, with 346.8 total hours over the month — roughly 11 hours of sun per day.

Rain in July came in short, intense bursts rather than steady drizzle. Geneva recorded 97.9 mm (3.85 in) of precipitation in July 2025, with 11 days seeing at least 1 mm of rain. The wettest day brought 18.5 mm on 26 July, often arriving as summer thunderstorms.

For visitors, July is one of the best months to experience Geneva: long, sunny days are ideal for strolling the lakefront, swimming, and dining outdoors. Just pack a light layer for cooler evenings and a compact umbrella, since the occasional afternoon storm can briefly drop temperatures by 10°C (18°F) or more before the warmth returns.

Question 5

How much total rainfall did Geneva get in 2025?

Accepted Answer

Geneva received approximately 1,365 mm (53.7 inches) of total precipitation across the full 2025 calendar year (January 1 to December 31), averaging around 114 mm (4.5 inches) per month.

The rainfall was spread unevenly through 2025, with a clear autumn peak. November was the wettest month with 241 mm (9.5 inches), followed by January at 206 mm (8.1 inches) and September at 167 mm (6.6 inches). At the other end, March was the driest month in Geneva, recording just 42 mm (1.7 inches).

Broken down by meteorological season, the autumn period (September to November 2025) dominated the year with 566 mm (22.3 inches) — about 42% of the annual total. The other seasons were far more balanced: spring (March to May) saw 265 mm (10.4 inches), winter's two months within 2025 (January and February) brought 249 mm (9.8 inches), and summer (June to August) added 242 mm (9.5 inches).

For visitors and residents, this means rainfall in Geneva is a year-round consideration rather than confined to one season. The relatively dry spring offers the most settled conditions for outdoor plans, while autumn travellers should pack for wet weather, as more than 40% of Geneva's 2025 precipitation fell in just three months. Carrying a light rain jacket is sensible in almost any month given the consistent monthly averages.

Le Grand-Saconnex

Geneva

FAQ

What were the temperature extremes in Geneva in 2025?

What is the sunniest time of year in Geneva?

Which season was the wettest in Geneva in 2025?

What is the weather like in Geneva in July?

How much total rainfall did Geneva get in 2025?