Weather in Mainz for September 2025
Until now, September 2025 in Mainz is cooler than usual, with temperatures averaging 20.8 °C, this is -2.6 °C below the typical seasonal average.
Expect cooler weather in the next days in Mainz with the forecast suggesting a temperature of 20 °C, lower than the historical average.
In general, the average temperature in Mainz at the beginning of September is 25 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 16.6 °C by the end of September.
The climate of Mainz in September is notably wet, with an average of 12 rainy days, and a total of 48.3 mm of precipitation.
Is September a good time to visit Mainz? check out the best time to travel to Mainz page.
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Mainz Weather September
Temperatures trend during September in Mainz
September weather in Mainz day by day
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. |  Light rain shower | 23° /16° | 4.2 mm | 5 | |
| 2 Sept. |  Fog | 25° /16° | 1.3 mm | 6 | |
| 3 Sept. |  Sunny | 26° /17° | 0.9 mm | 6 | |
| 4 Sept. | Sunny | 23° /16° | 1 mm | 6 | |
| 5 Sept. | Sunny | 26° /16° | 1.1 mm | 6 | |
| 6 Sept. | Sunny | 24° /16° | 0.4 mm | 6 | |
| 7 Sept. | Sunny | 28° /16° | 0 mm | 7 | |
| 8 Sept. | Sunny | 25° /16° | 0.9 mm | 6 | |
| 9 Sept. | Sunny | 22° /15° | 11.7 mm | 5 | |
| 10 Sept. | Patchy rain possible | 22° /15° | 0 mm | 5 | |
| 11 Sept. |  Overcast | 22° /14° | 1.8 mm | 5 | |
| 12 Sept. |  Thundery outbreaks possible | 21° /12° | 3.3 mm | 4 | |
| 13 Sept. | Overcast | 18° /12° | 1.1 mm | 4 | |
| 14 Sept. |  Cloudy | 20° /12° | 1.6 mm | 4 | |
| 15 Sept. | Patchy rain possible | 23° /17° | 3.5 mm | 0.8 | |
| 16 Sept. | Patchy rain possible | 18° /13° | 0.8 mm | 0.6 | |
| 17 Sept. | Cloudy | 19° /11° | 0 mm | 0.8 | |
| 18 Sept. | Sunny | 26° /13° | 0 mm | 1.2 | |
| 19 Sept. | Sunny | 27° /15° | 0 mm | 1.2 | |
| 20 Sept. | Sunny | 29° /17° | 0 mm | 6 | |
| 21 Sept. | Patchy rain possible | 21° /16° | 0.3 mm | 4 | |
| 22 Sept. | Patchy rain possible | 21° /14° | 3.1 mm | 4 | |
| 23 Sept. | Patchy rain possible | 16° /12° | 3.5 mm | 3 | |
| 24 Sept. | Patchy rain possible | 16° /9° | 0.4 mm | 3 | |
| 25 Sept. | Patchy rain possible | 16° /10° | 0 mm | 3 | |
| 26 Sept. |  Partly cloudy | 15° /10° | 0.1 mm | 4 | |
| 27 Sept. | Sunny | 16° /7° | 0 mm | 4 | |
| 28 Sept. | Sunny | 17° /7° | 0 mm | 4 | |
| 29 Sept. | Patchy rain possible | 19° /12° | 0 mm | 4 | |
| 30 Sept. | Sunny | 17° /11° | 0.3 mm | 5 | |
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Mainz weather in September vs August vs October
| August | September | October | |
|---|---|---|---|
| Weather | Patchy rain possible | Patchy rain possible | Patchy rain possible |
| Temperatures | 25°/17° | 22°/15° | 16°/10° |
| Rainfall | 89 mm | 48 mm | 75 mm |
| Wind | 12.5 km/h | 13.4 km/h | 13.2 km/h |
| Humidity | 65% | 62% | 73% |
| Rainy days | 19 days | 12 days | 18 days |
| Dry days | 12 days | 18 days | 13 days |
Planning a trip to Mainz? Discover the best time to visit
Mainz in September - FAQ
What to pack to Mainz in September?
As you prepare for your trip to Mainz in September, it's important to consider the typical weather patterns for the time of year. Below is a carefully tailored packing list to ensure that your time in Mainz, during September, is comfortable and enjoyable, regardless of the weather conditions.
- Clothing
- Layered Clothing: Light sweaters, long-sleeve shirts, light jackets, and comfortable pants
- Rain Gear: Lightweight, waterproof clothing
- Footwear
- Waterproof Shoes
- Accessories
- Sunglasses: For sun protection
- Sun Hats: Wide-brimmed hats for sun protection in warm weather
- Umbrellas/Raincoats: For rainy days
September rainfall patterns in Mainz
UV exposure in Mainz during September
Quick links
Where is Mainz?Get accurate weather forecasts for Mainz, located at latitude 49.984 and longitude 8.279. Stay updated with localized weather information tailored for Mainz.