Pollen Count in Rennes
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Rennes, France has different pollen seasons. Trees produce pollen in spring, from March to May. Grasses produce pollen in late spring and early summer.
Updated: 4/21/2026
Pollen counts are usually high in April and May. Trees like oak, birch, and beech release pollen. This makes it hard for people to stay outside.
Grasses and weeds produce pollen in June and July. Pollen counts can be high on warm and sunny days. Windy days also spread pollen.
Rennes' pollen season ends in summer. Late August and September have low pollen counts. People can enjoy the outdoors without many pollen problems.
Pollen Forecast Chart
Recommendations
When pollen concentrations reach a peak, we suggest these simple steps to help with hay fever. These tips are extra important on windy days when plants are in peak anthesis (the time when they release the most pollen).
- Wear masks if necessary
- Shower after going out
- Wear sunglasses if windy
- Close windows and doors
- Use an indoor air purifier
- Avoid wearing woolen clothes outside
- Limit outdoor activities
Annual Pollen Overview
Check out this month-by-month overview of the daily average pollen count in Rennes 🌾. This data is based on previous years and serves as a guideline to help you understand when different pollen seasons typically occur in your city.
| Alder | Birch | Grass | Mugwort | Olive | Ragweed | |
|---|---|---|---|---|---|---|
| Jan | 0 | 0 | 0 | 0 | 0 | 0 |
| Feb | 9.6 | 0 | 0 | 0 | 0 | 0 |
| Mar | 256.5 | 145.1 | 0.7 | 0 | 0 | 0 |
| Apr | 4.6 | 844.4 | 37.8 | 0 | 0.1 | 0 |
| May | 0.8 | 27.8 | 326.8 | 0 | 4.6 | 0 |
| Jun | 0 | 0 | 1016.4 | 0.8 | 0.3 | 0 |
| Jul | 0 | 0 | 380 | 27.6 | 0 | 0 |
| Aug | 0 | 0 | 101 | 29.5 | 0 | 0.5 |
| Sep | 0 | 0 | 8.2 | 17.7 | 0 | 0.7 |
| Oct | 0 | 0 | 1.2 | 3 | 0 | 0 |
| Nov | 0 | 0 | 0 | 0.1 | 0 | 0 |
| Dec | 0 | 0 | 0 | 0 | 0 | 0 |
(59 km)