Weather in Lima 🇵🇪
Monthly weather averages & travel planning
September
Avg Temp
21°C
Rain Days
0 days
Sun Hours
12 hrs
Humidity
82%
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
70°F
Avg High
15°C
59°F
Avg Low
0 days
2 mm total
Rain Days
12h
per day avg
Sunshine
82%
Humid
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 Trends
High
Low
Rainfall (mm)
0-20 mm21-50 mm51-100 mm100+ 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 |
January
4 rain days, 11h sun
26°20°
February
8 rain days, 10h sun
26°21°
March
7 rain days, 11h sun
26°21°
April
2 rain days, 11h sun
25°19°
May
0 rain days, 11h sun
23°18°
June
0 rain days, 11h sun
21°16°
July
0 rain days, 11h sun
21°15°
August
0 rain days, 11h sun
20°15°
September
0 rain days, 12h sun
21°15°
October
0 rain days, 12h sun
22°16°
November
1 rain days, 12h sun
23°17°
December
2 rain days, 11h sun
24°19°
Other Months in Lima
Plan Your Trip to Lima
Data Sources for Lima
Climate normals represent 30-year averages (1991-2020). Individual years may vary.