Monsanto Weather in September
What's the weather like in Monsanto (Santarém) in September 2025?
The climate in Monsanto during September can be summarized as warm and reasonably dry.
September is in the fall / autumn in Monsanto and is typically the 3rd warmest month of the year. Daytime maximum temperatures average around a comfortable 27°C (80°F), whilst at night 16°C (60°F) is normal.
| Daytime temperature | 26.5°C 79.7°F |
|---|---|
| Nightly temperature | 15.7°C 60.3°F |
| Average temperature | 21.1°C 70°F |
| Daily sunshine | 8.9 hrs |
| Avg rainfall | 39 mm 1.5 ins |
| Rainy days | 7 days |
| Sea temperature | 19.7°C 67.4°F |
| Humidity | 66% |
| Windspeed | 11.9kph 7 mph |
On average September is the 4th driest month of the year in Monsanto with around 39mm 1.5 inches of rain making it a reasonably dry time to visit. This rainfall is typically spread over 7 days, although this may vary considerably.
On the flip side this corresponds to an average of 8.9 hours of sunshine per day.
September temperatures in Monsanto
September rainfall
September hourly sunshine
The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in Monsanto in September 2025.
Other monthly averages
Best places to visit in September
Monsanto weather stats
| Hottest month: | August | 28°C 82.4°F |
|---|---|---|
| Driest month: | July | 9mm 0.4ins |
| Sunniest month: | August | 11.5hrs |
| Coldest month: | January | 13.7°C 56.7°F |
| Wettest month: | February | 129mm 5.1ins |
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