Mainland Portugal recorded its hottest September since 1931
IPMA's preliminary climate summary puts mainland Portugal's September mean temperature at 23.41°C, 2.91°C above the 1991–2020 average.
Archived after its publication day. Search retains this original briefing for background and accountability.
Archived 12 September 2026This is a monthly climate assessment, not today's forecast. It matters for water, agriculture, heat planning and long-term risk, but current decisions require live local information.
- The mainland average maximum reached 31.03°C, 4.21°C above normal.
- September rainfall totalled 12.7 mm, about 30% of normal and the fifth-lowest September total since 2000.
- Two heatwaves affected the mainland; the later event was observed at 72% of IPMA stations.
Exceptionally hot and very dry
IPMA classifies September 2026 on the mainland as extremely hot and very dry. The mean minimum temperature was 15.79°C, the fourth-highest September value since 1931, while new September temperature extremes were recorded at multiple stations.
The first heatwave affected the northern interior from 2 to 7 September. The second ran between 18 and 27 September for six to ten days across much of the country.
Climate record and daily weather are different
The bulletin summarises the past month using national and station data. It does not tell a household whether rain, heat or fire danger is expected today.
Use live IPMA forecasts and civil-protection notices for immediate decisions. For property or agricultural planning, combine the longer record with local water supply, shade, building performance, soil and wildfire context.
What you can do now.
- 01
Use IPMA's live forecast for today's decisions.
- 02
Review local water and heat resilience before property or planting choices.
- 03
Keep monthly climate records separate from short-term warnings.
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