Rennes air quality

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Air quality in Rennes is currently good, with a US AQI of 37 (European AQI 26). The dominant pollutant right now is ozone. Air quality is healthy; no precautions needed. Fine particulate matter (PM2.5) measures 10.5 µg/m³. Pollen in the air today: grass (high) — allergy sufferers take note.

Pollutants

PM2.5

10.5 µg/m³

PM10

17.7 µg/m³

Ozone (O₃)

66 µg/m³

NO₂

5 µg/m³

SO₂

0.3 µg/m³

CO

128 µg/m³

Dust

6 µg/m³

Pollen

Grass

102 gr/m³

Birch

0 gr/m³

Alder

0 gr/m³

Olive

0.1 gr/m³

Mugwort

0.1 gr/m³

Ragweed

0 gr/m³

AQI computed from the CAMS air quality model via Open-Meteo. Bands follow the US EPA scale.

Right now in Rennes, it's clear sky with the temperature at 26 °C. It feels warmer than it reads, more like 29 °C. Wind is from the NNE at 8 km/h. Humidity stands at 72% with sea-level pressure near 1022 hPa.

At a glance

Expect moderate drizzle today, between 25 °C and 41 °C. Gusts may reach 58 km/h from the ENE. Tomorrow looks like overcast; temperatures run from 29 °C up to 43 °C. Gusts may reach 56 km/h from the ESE. Wednesday looks like overcast; temperatures run from 32 °C up to 43 °C. Gusts may reach 42 km/h from the E.

Soil temperatures today read surface 31 °C, 6 cm 30.5 °C, 18 cm 28.1 °C, 54 cm 19.9 °C. Soil moisture sits at 0-1 cm at 0.07 m³/m³, 3-9 cm at 0.12 m³/m³, 27-81 cm at 0.2 m³/m³. For wheat, the root-zone reading is below the ideal 0.2-0.35 m³/m³ band. Reference evapotranspiration totals 57 mm against only 3 mm of expected rain — a 54 mm deficit, so irrigation will be needed this week. A suitable spraying window opens around 07:00 on 2026-06-22, with winds at or below 15 km/h and no rain expected. Heat stress is likely for wheat with highs reaching 43 °C (threshold 32 °C). Heat stress is likely for maize with highs reaching 43 °C (threshold 35 °C). Projected growing degree days over the next week: wheat 184, maize 146.

Topsoil moisture

0.093 m³/m³

Soil temp

27°C

ET₀ today

7.89 mm

Spray window

~5:00

Rain (next 7d)

3.3 mm

Wind

8 km/h

Humidity

72%

Full farming outlook for Rennes →

Weather alerts for Rennes (derived from forecast data, not official warnings): Extreme heat today: feels-like temperatures up to 41 °C. Extreme heat tomorrow: feels-like temperatures up to 42 °C. Extreme heat Wednesday: feels-like temperatures up to 42 °C. Extreme heat Thursday: feels-like temperatures up to 41 °C.

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