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The weather in Merced in September is hot. The average temperatures are between 18°C and 34°C. Usually the days in September are hot while the nights are a bit cooler.
There shouldn't be any rainy days in in Merced during September. Having said that, the days are very hot in September so hanging out outside is more recomanded during the after noons and evening time.
Our weather forecast can give you a great sense of what weather to expect in Merced in September 2025.
If you’re planning to visit Merced in the near future, we highly recommend that you review the 14 day weather forecast for Merced before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 15° / 6° | 5 | 26 | 0 | 93 mm | Good | Merced in January |
| February | 16° / 6° | 5 | 23 | 0 | 65 mm | Good | Merced in February |
| March | 19° / 8° | 6 | 25 | 0 | 85 mm | Good | Merced in March |
| April | 23° / 10° | 3 | 27 | 0 | 33 mm | Perfect | Merced in April |
| May | 28° / 13° | 2 | 29 | 0 | 16 mm | Perfect | Merced in May |
| June | 34° / 17° | 0 | 30 | 0 | 4 mm | Ok | Merced in June |
| July | 38° / 20° | 0 | 31 | 0 | 0 mm | Bad | Merced in July |
| August | 37° / 20° | 0 | 31 | 0 | 0 mm | Ok | Merced in August |
| September | 34° / 18° | 0 | 30 | 0 | 5 mm | Ok | Merced in September |
| October | 27° / 14° | 2 | 30 | 0 | 26 mm | Perfect | Merced in October |
| November | 19° / 8° | 3 | 27 | 0 | 41 mm | Good | Merced in November |
| December | 14° / 6° | 6 | 25 | 0 | 95 mm | Good | Merced in December |