Weather in Terceira Island in September 2025
Average weather
Average temperature in Terceira Island in September
Going from a maximum of +70°F during the day to a minimum of +61°F during the night, the temperature in September averages around +68°F.
The average maximum temperature goes down 40% by the end of the month, compared with the beginning of the month, from +70°F to +66°F.
Is Terceira Island warm or cold in September?
Terceira Island is typically mild in September.
Maximum temperatures go down compared to the previous month from +68°F to +66°F. The minimum temperature also goes down from +64°F to +63°F.
Pack a light jacket as it will be warm in the day and cool in the evenings.
September is one of the warmest months in Terceira Island, here is the comparison with other months:
Climate in Terceira Island in September
| August | September | October | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +68°F | +66°F | +63°F | ||||
| Min. temperature | ||||||
| +57°F | +54°F | +46°F | ||||
| Max. temperature | ||||||
| +81°F | +79°F | +75°F | ||||
| Rainfall | ||||||
| 37 mm | 58 mm | 93 mm | ||||
| Wind | ||||||
| 3 m/s | 3 m/s | 4 m/s | ||||
| Humidity | ||||||
| 81% | 80% | 79% | ||||
| Air pressure | ||||||
| 1022 HPa | 1020 HPa | 1018 HPa | ||||
| Sunny days | ||||||
| 3 | 2 | 1 | ||||
| Cloudy days | ||||||
| 14 | 12 | 10 | ||||
| Rainy days | ||||||
| 13 | 16 | 20 | ||||
| Snowy days | ||||||
| 0 | 0 | 0 | ||||
September weather is still as ok as in August. It’s getting colder in September. From +68°F in the day, the average maximum temperature lowers to +66°F. Prepare for more rain. Average rainfall goes from 37 mm to 58 mm. It feels drier, as humidity decreases from 81% to 80%. The average wind speed doesn’t change much during September, staying around 3 m/s. The days becoming less sunny, going from 3 sunny days in August to 2 in September.
October brings much the same weather, it remains ok.
Wind
The average wind speed is 2 m/s getting up to 5 m/s which is a light breeze; barely moving the tree leaves.
The average wind speed in Terceira Island is gradually increasing during September, going from 1 m/s to 1 m/s over the course of the month.
Rain
How was the weather last September in Terceira Island?
Climate Change Over the Years
The climate in Terceira Island in September has not changed that much over the last 43 years.
The average temperature was the lowest in 1983 (+58°F) and the highest in 2017 (+64°F). The driest year was 1999 with only 487 mm of rainfall, and the wettest year was 2021 with 1425 mm.
FAQ
Is September a good time to visit Terceira Island?
Can you sunbathe in Terceira Island in September?
Is Terceira Island rainy in September?
Is it sunny in Terceira Island in September?
Other cities in Portugal
Monthly weather in Terceira Island
Source of the data
For this page, we’ve looked at the typical weather in Terceira Island, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.