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Why Pamplona Hits 32°C During Running of the Bulls — and Why That Matters for Your Gear

Why Pamplona Hits 32°C During Running of the Bulls — and Why That Matters for Your Gear

Pamplona Weather in July for the Running of the Bulls: Heat, Humidity, and a 14°C Daily Swing

Pamplona in July averages highs of 32°C (90°F) and lows around 18°C (64°F) during the San Fermín festival (July 6–14), and that 14°C (25°F) daily swing is the central packing problem most visitors fail to solve. The Navarre valley location amplifies this: unlike coastal cities where sea breezes blunt afternoon heat, Pamplona sits inland at roughly 450 meters (1,480 feet) elevation, surrounded by hills that trap warm air during the day and release it slowly overnight. The result is a climate that demands different clothing for a 7:30 a.m. bull run and a 2:00 p.m. street party — sometimes worn on the same body, simultaneously.

The Daily Temperature Arc: What the Numbers Actually Look Like

During San Fermín week, Pamplona follows a fairly consistent daily pattern based on historical July averages for the region:

  • Dawn (6:00–7:00 a.m.): 17–19°C (63–66°F). Cooler than most visitors expect, especially after a night of festivities. Wind chill along the encierro route can make it feel closer to 15°C (59°F).
  • Mid-morning (9:00–11:00 a.m.): 22–25°C (72–77°F). Temperatures climb quickly after sunrise. Crowds concentrated in the old quarter retain heat at street level.
  • Early afternoon (1:00–3:00 p.m.): 28–32°C (82–90°F). Peak heat. UV index regularly reaches 8–9 (very high) during this window.
  • Late afternoon (4:00–6:00 p.m.): Still 27–30°C (81–86°F), with relative humidity often rising toward 55–65% as instability builds. This is the thunderstorm window.
  • Evening (8:00–10:00 p.m.): 23–26°C (73–79°F). Pleasant if you're standing still. Less pleasant if you've been dancing in the streets since noon.

Humidity stays relatively moderate in the mornings — typically 50–60% — but climbs through the afternoon. It never reaches the suffocating levels of, say, coastal Valencia in August, but combined with direct sun and large crowds, 60% humidity at 32°C (90°F) makes prolonged outdoor exposure genuinely unpleasant. Shade and water access matter.

How Often Do Afternoon Thunderstorms Actually Disrupt the Festival?

Navarre sits at the climatic intersection of Atlantic and Mediterranean influences, and July is when that tension occasionally becomes a thunderstorm. Pamplona averages roughly 3–4 days of measurable precipitation in July, with totals around 35–45mm (1.4–1.8 inches) for the month. During San Fermín's nine days, statistically expect 1–2 days with meaningful rainfall, usually in the form of convective afternoon storms rather than all-day soakers.

These storms matter for specific events. The bullfights at 6:30 p.m. in the Plaza de Toros can be delayed but rarely canceled outright. Outdoor concerts and street events in the plazas are more vulnerable — a sharp 30-minute downpour can scatter crowds and temporarily shut down sound equipment. The encierro itself runs at 8:00 a.m. and historically proceeds unless conditions are extreme; light rain doesn't stop it, and the course is on stone streets that drain quickly.

The practical problem isn't cancellation — it's being caught unprepared. A fast-moving storm can drop 15–20mm (0.6–0.8 inches) in under an hour. Anyone standing in Calle Estafeta in a soaked white linen shirt at 5:00 p.m. with no jacket learns this lesson once.

The Gear Problem: Dressing for 18°C at Dawn and 32°C by Noon

The traditional San Fermín outfit — white trousers, white shirt, red neckerchief, red sash — is actually reasonably well-suited to the mid-morning heat. White cotton reflects sun and breathes adequately. The problem is the hours before and after the main heat window, and the problem is layers.

For the Encierro (Bull Run) at 8:00 a.m.

Runners and spectators gathering at 6:30–7:00 a.m. will encounter temperatures of 17–19°C (63–66°F). That's sweatshirt territory, not light cotton. A thin layer worn over the white shirt — something packable that stuffs into a bag or ties around the waist — is the practical solution. Fleece is too warm by 9:00 a.m. A lightweight zip-up or a packable quarter-zip in a neutral color works.

Footwear matters here more than at most festivals. The encierro route is cobblestone. Spectators crowd barriers for hours before the run. Running shoes with actual grip, worn-in rather than fresh out of the box, are the correct answer. Sandals, flip-flops, and dress shoes are not.

For Midday and Afternoon Street Events

By noon, the extra layer is a liability. Sun protection becomes the priority. A UV index of 8–9 means unprotected skin can burn in under 20 minutes. SPF 50, a hat that actually shades the face (not a red beret worn at a decorative angle), and consistent water intake are non-negotiable at this point in the day. Dehydration among festival-goers is a documented problem during San Fermín, and alcohol consumption accelerates it significantly.

A packable rain shell — something under 300g (10 oz) that compresses to fist-size — handles both the afternoon thunderstorm risk and the cooler evening temperatures. This is the single most versatile item to add to the packing list.

Overnight Considerations

If staying in central Pamplona, note that many older buildings lack air conditioning. Overnight lows of 18°C (64°F) sound manageable, but urban heat retention in a stone city center can keep interior temperatures 3–4°C (5–7°F) above that. A fan, earplugs (the city doesn't fully quiet until 4:00 a.m. at the earliest during the festival), and genuine darkness for sleeping are worth arranging in advance rather than hoping for.

Tracking the Forecast During the Festival

Navarre's weather in July is predictable in pattern but variable in timing — the afternoon storm window shifts day to day, and knowing whether it arrives at 4:00 p.m. or 7:00 p.m. changes which events to prioritize. The WeatherGO app gives hourly forecasts specific to Pamplona's location, which is more useful during festival week than a general regional outlook.

Practical Takeaways

  • Plan around the 14°C (25°F) daily temperature swing. One outfit does not cover dawn and midday.
  • Bring a packable rain shell. Weight it against a ruined afternoon — the shell wins.
  • SPF 50 and a functional hat for UV index 8–9 conditions between noon and 4:00 p.m.
  • Expect 1–2 days of afternoon thunderstorms during the nine-day festival. Build flexibility into evening plans.
  • Proper footwear for cobblestone streets is not optional. Start with broken-in soles.
  • Hydration is a logistics problem in a city of 200,000 extra people. Carry water. The heat and the crowds will outlast any casual approach to staying hydrated.
  • Book accommodation with cooling in mind. July nights in the old quarter are warmer than the forecast low suggests.