Lisbon Weather

September 2026

Historical data
Average Temperature
31.4 °C
High
/
19.7 °C
Low
3.2mm
Precipitation
39.6°C
Peak Temp
16.8°C
Low Temp
30
Days Count

Temperature Trends

Daily high, low, and average

Weather Extremes

Most notable conditions during this period

Period High

39.6°C
Thursday, September 3

Coolest Day

24.8°C
Wednesday, September 30

Compare with historical weather

Load the same period from the previous 15 years.

Weather Insights

Key findings from analysis for selected period

Variable with Hot Extremes

Worth noting

Average of 31.4°C but 4 very hot days (39.6°C peak).

Variable Temperatures

Worth noting

Large temperature swings (22.8°C range) for a month.

Dry Weather

Notable

Very little rainfall (3mm total).

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3 Exceptional Weather Events

Info

The most extreme days in this period:

Sep 3 Heat

Hottest day: 39.6°C

Sep 5 Heat

Very hot day: 35.8°C

Sep 12 Heat

Very hot day: 35.5°C

3 Extreme Heat Index Days

Worth noting

3 days with dangerous heat index levels (43.7°C average). Temperature 36.3°C combined with 50% humidity creates hazardous conditions.

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Low Humidity Environment

Info

Average humidity of 52% indicates relatively dry air conditions. Lower heat sensation during warm periods, potential for dry skin/throat. Humidity varied significantly (31%-77% range).

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