The most recent edition on this page is dated Sep 13, 2026. The next edition date is not locked here yet. Use the historical race-morning weather on this page for planning until the next date is published.
Half
Porto Half Marathon
Sunday, September 13, 2026Porto, Portugal
Goal time
1:35:00
Adjusted time (preview)
1:38:00–1:41:15
+3 min to +6:15 slower
Challenging conditions. Main factor: heat. Get your personalised finish time and split-by-split pacing plan with Race Pass.
Based on the historical mean for the race window over the last 10 years, ±5 days.
About 88 m of climbing and 87 m of descent. Rolling.
Almost all within 2%2% over 6%Four climbsOne climb over 6%
Impacts
Based on the historical mean for the race window over the last 10 years, ±5 days.
Elevation
Low impact
≤1%
Heat
High impact
>3%
Wind
Moderate impact
1–3%
Total Impact
High impact
>3%
Pace Opportunity
Challenging
ChallengingModerateFavorable
Race Pass: personalised finish time, adjusted splits, and your race-day pacing plan.
Historical weather
10 held editions. Race mornings only, not nearby dates. This is not a forecast.
20°C
17 - 26°C range
Partly cloudy on average
Historical: partly cloudy, with moderate winds
Historical average
10 held editions. Race mornings only, not nearby dates.
2017-2026
Cloud Cover
38%
0 - 100% range
Wind
14km/h
2 - 31 km/h range • prevailing E
Humidity
69%
39 - 93% range
WBGT
18.2°C
16.2 - 18.3°C range
Race morning history
Last 10 years, around the 09:00 start hour. Typical mid-September air averages 20°C (about 15°C to 26°C in that window). The bands are that history, not a forecast range. Hover or drag to explore.
Race-morning temperature
Most mornings
17-23°C
Almost all
16-25°C
Humidity
69%
Dew
15°C
WBGT
18°C
20°CAverage
09:00-10:35
Almost all (90%)Most mornings (70%)AverageRain
Year pills: green is favorable heat. Amber is moderate. Red is challenging.
Blue is most mornings. Dashed lines are the rare tails. Pink is the average. The bands are historical race mornings, not a forecast range. Blue columns are rain on the right scale. This assumes a 1:35. You can set your own time in the app.
Typical race-morning wind
Where the wind usually came from on race morning, not where it was going.
E
Most frequent (25%)
Wind speed
0-6 km/h
6-13 km/h
13-21 km/h
21+ km/h
Year pills: green is favorable wind. Amber is moderate. Red is challenging. Colours assume no drafting.
A start that feels cool is not a promise about the second half.
Related races
Same city, region or country, when we can resolve them. World majors also point to each other.
- Porto Marathon
- Gaia Half Marathon
- Lisbon Half Marathon
- Lisbon Hyundai Half Marathon
- Meia Maratona D'Ouro Run
- Lisbon Marathon
- Meia Maratona de Ovar
View race map for this area.
Make sense of the conditions
- Dew point, WBGT and running in the heat
Read the heat and humidity before deciding what pace makes sense.
- When drafting helps your running pace
A group can help, but its pace and the conditions still need to suit you.
- Pacing the climbs and descents
Use the course profile to think about effort, not just splits.
Pacing and conditions FAQ
Beyond conditions
Conditions are only part of the race-day loss
Pacing mistakes often add several minutes, sometimes more than conditions alone, especially when the course and conditions are not ideal.
What your plan includes
Everything you need to turn this race preview into a usable race-day plan.
Personalized pacing
Effort and pace guidance tuned to this course profile.
Weather-adjusted splits
Split targets that account for heat, wind, and elevation.
Heat adaptation & drafting
Adjust for your heat tolerance and drafting preferences.
Get your personalised race plan for Porto Half Marathon.
Pacing, splits, and race-day strategy personalised to your fitness and this course.
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