Lima Weather in September

🇵🇪 Peru

21°C

High

15°C

Low

Rain Days

12h

Sunshine

82%

Humidity

South America › 🇵🇪 Peru › Lima

Updated: March 2026

Is September a Good Time to Visit Lima?

8/10

Excellent

September is a excellent time to visit Lima (8/10). With 12 daily sunshine hours and only 0 rain days, this month delivers genuinely reliable outdoor conditions, ranking it the sunniest month of the year in Lima. Beach and outdoor-focused visitors will find September ideal, though hotel prices reflect demand and popular sites get crowded by mid-morning. October offers a similar profile at lower hotel rates if dates are flexible. The main practical note: Lima's popular sites are busiest between 10am and 3pm regardless of season. Arriving at opening time or after 4pm makes a significant difference to the experience. Planning tips: book accommodation at least 6-8 weeks ahead, as popular hotels fill quickly during September. Purchasing skip-the-line tickets for major attractions in advance saves meaningful time. If you have flexibility, arriving a few days before or after peak weekends reduces both crowds and prices noticeably.

vs August:20°C avg high

Based on 30-year climate normals (1991 to 2020), September in Lima averages 21°C by day and 15°C overnight, a range that places it in the temperate middle ground of the year. The month records approximately 12 sunshine hours per day and 2mm of total rainfall across 0 wet days, giving it a sunshine-to-rain ratio that is decidedly favourable for outdoor travel.

21°C

Avg High

15°C

Avg Low

0 days

Rain Days

12h

Sunshine

82%

Humidity

Temperature in Lima in September

The 6°C day-night temperature range is typical for continental climates: a light jacket in the morning that you shed by midday and need again after sunset. At 82% humidity, the 21°C daytime high feels 2-4°C warmer in practice: quick-dry fabrics and shade-seeking between noon and 3pm are the sensible response. UV index averages 6 this month, classed as moderate. Sunscreen is a sensible precaution for extended outdoor time, particularly at midday. Wind averages 15 km/h, light enough to be refreshing on warm days but noticeable in open coastal areas or elevated viewpoints. In Fahrenheit: 70°F average high, 59°F overnight low. Data sourced from Open-Meteo ERA5 climate reanalysis (1991–2020 normals).

Temperature in September

Monthly Precipitation (mm)

What to Wear in Lima in September

Morning15°CBefore the day warms up

Afternoon21°CPeak daytime temperature

Evening18°CAfter sunset cools down

Packing for Lima in September means dressing for 21°C days and 15°C evenings. A light cotton tee with a casual overshirt works well at 21°C, the overshirt doubles as a layer for air-conditioned venues. Evening temperatures settle at 15°C, a modest 6°C drop that a light cardigan or denim jacket covers. Comfortable walking trainers are the versatile choice for both outdoor sightseeing and indoor venues. At 82% average humidity, quick-dry synthetic or bamboo fabrics dry overnight and stay comfortable longer than cotton.

💡

Local tip: Layers are more practical than a single heavy garment in Lima. The day-to-evening temperature shift rewards packing a versatile mid-layer you can add or remove as conditions change.

Events in Lima in September

September has no major festivals or public holidays in Lima, which is one of its practical advantages for independent travellers. Attractions run at lower capacity than during peak event periods, queues are shorter, and accommodation is easier to find without needing to book many months in advance. Local restaurants, markets, and transport operate at a relaxed pace, making this an ideal time for visitors who prefer a more authentic, unhurried experience of everyday city life rather than large crowds drawn in by a single major headline event.

What to Pack for Lima in September

Based on 21°C average highs and 0 rainy days

Light jacket or cardigan for cooler evenings
Mix of short and long-sleeve layers
Comfortable walking shoes with good arch support
Universal travel adapter
Small day pack for city exploration
Reusable water bottle

Best Activities in Lima in September

Explore outdoor markets and street food stallsMid-morning (10am-12pm)At 21°C, the temperature is ideal for extended walking without overheating
Guided walking tour of the historic centreMorning or late afternoonComfortable temperatures allow several hours on foot without fatigue
Visit rooftop viewpoints and observation decksGolden hour (1 hour before sunset)Warm clear evenings provide exceptional visibility for panoramic photography
Day trip to the surrounding countryside or coastFull day (depart by 8am)September is reliably dry enough for rural day trips without weather risk
Afternoon in a world-class museum or galleryAfternoon (2-5pm)Pairs well with outdoor morning activities and provides a mid-day rest from sightseeing
Coffee-house or traditional cafe culture experienceMid-morning or post-lunchA cultural ritual in this region that rewards slow appreciation regardless of weather
Evening live music, theatre, or opera performanceEvening shows typically at 7-9pmConsistent evening temperatures make getting to and from evening venues comfortable
Visit the main botanical garden or city park at seasonal peakYear-round; best light in morningSeptember brings distinct seasonal changes to public green spaces worth exploring
Try the seasonal farmer's market for local produce and street foodSaturday morning markets typically 8am-1pmSeptember seasonal produce is at peak availability, offering dishes not found at other times of year

Why is Lima mild in September?

In September, Lima sits in the dry season corridor, as the ITCZ shifts away from the region and trade winds bring drier, more stable air. This produces reliably sunny days reaching 21°C, with lower humidity than the wet months. Overnight lows of 15°C offer a pleasant reprieve from the midday heat. Climate data: Open-Meteo ERA5 (1991–2020).

Sunshine Hours

The average number of hours per day with direct sunlight. Calculated from satellite measurements. Days with more than 7 hours of sunshine are ideal for outdoor activities. Under 3 hours means overcast conditions dominate.

UV Index

A scale from 0-11+ measuring ultraviolet radiation intensity. UV 0-2: Minimal risk. UV 3-5: Moderate -- wear sunscreen. UV 6-7: High -- hat and SPF 30+ essential. UV 8-10: Very High -- limit midday exposure. UV 11+: Extreme -- seek shade between 10am-4pm.

Rain Days

A rain day is counted when precipitation exceeds 0.1mm. This threshold captures even light drizzle. Unlike total rainfall in mm, rain days tells you how often you might need an umbrella, which is useful for planning outdoor activities.

Humidity

Relative humidity as a percentage. Below 40%: Dry -- skin and throat may feel parched. 40-60%: Comfortable -- ideal for most people. 60-80%: Sticky -- light, breathable fabrics recommended. Above 80%: Muggy -- heat feels more intense; quick-dry clothing is essential.

Frequently Asked Questions: Lima in September

In September, Lima experiences average highs of 21°C (70°F) and lows of 15°C (59°F). Expect around 0 rainy days and 12 hours of sunshine per day, with humidity averaging 82%. The 6°C gap between daytime and overnight temperatures is worth planning around: light layers work for most visitors during the day, but an overshirt or cardigan handles the cooler evenings. UV index averages 6, so sun protection is advisable on clear days.

Lima typically sees 0 rainy days in September, with total precipitation of around 2mm. This makes September one of the drier months of the year, and a reliable window for outdoor sightseeing and day trips. Rain showers tend to be brief when they do occur. For context, the driest month in Lima typically sees 4-6 fewer rain days than September.

Pack light layers, a light jacket for evenings, comfortable walking shoes, and sunscreen for Lima in September. Daytime temperatures of 21°C are pleasant, but the evening drop to 15°C means a jacket is essential if you plan to be out after dark. Rain is infrequent with only 0 wet days, so a light rain layer is optional. Comfortable walking shoes are a priority given the amount of ground most visitors cover.

Yes, September is an excellent time to visit Lima. With 12 daily sunshine hours and only 0 rainy days, conditions are ideal for sightseeing and outdoor activities. Temperatures averaging 21°C during the day are comfortable for long walks and outdoor dining. This is peak travel season, so booking accommodation in advance and arriving at popular attractions early in the morning helps avoid the busiest periods.

The average high temperature in Lima in September is 21°C (70°F), and the average low is 15°C (59°F). The mean daily temperature is approximately 18°C (64°F). The day-to-night range of 6°C is moderate, meaning a single light jacket covers most situations. These are 30-year climate normals based on the 1991 to 2020 reference period; individual years will vary, particularly in transitional months like spring and autumn.

The best month to visit Lima is generally September. September offers the most sunshine at 12 hours per day and only 0 rainy days. Average temperatures reach 21°C, making it comfortable for sightseeing, outdoor dining, and exploring the city. If your travel dates are flexible, planning your trip around September gives you the best chance of dry, bright weather.

September is shoulder or low season in Lima, meaning fewer tourists and generally lower prices than peak months. With 12 sunshine hours and 0 rainy days, the weather is less of a draw for mass tourism. This is an advantage for travellers who prefer a quieter, more relaxed experience with shorter queues and easier accommodation availability.

In September, Lima suits a range of activities thanks to mild temperatures around 21°C. With few rainy days, outdoor activities are highly recommended. Top options include exploring historic neighbourhoods, visiting museums and galleries, local food markets, and day trips to surrounding areas. With 12 hours of sunshine, parks and waterfront walks are particularly enjoyable.

September ranks 1st sunniest of the year in Lima, with an average 12 daily sunshine hours. The driest months are May, June, and July. January is the hottest month (26°C avg high); August is the coolest (20°C). From here, temperatures rise 1°C into October. Compared to last month (August: 20°C high, 0 rain days), September is warmer and equally dry. September is among the top three sunniest months to visit Lima.

Year-Round Climate

Month	High	Low	Rain Days	Sun	Details
January	26°C	20°C	4	11h	View
February	26°C	21°C	8	10h	View
March	26°C	21°C	7	11h	View
April	25°C	19°C	2	11h	View
May	23°C	18°C	0	11h	View
June	21°C	16°C	0	11h	View
July	21°C	15°C	0	11h	View
August	20°C	15°C	0	11h	View
September	21°C	15°C	0	12h	View
October	22°C	16°C	0	12h	View
November	23°C	17°C	1	12h	View
December	24°C	19°C	2	11h	View

Other Months in Lima

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Plan Your Trip to Lima

Best Time to Visit Lima

Data Sources for Lima

Lima on Wikipedia Open-Meteo Climate API NOAA National Centers UK Met Office WMO GeoNames

Climate normals represent 30-year averages (1991-2020). Individual years may vary.