Westmoreland solar guide

Strong western sunshine, especially toward the coast.

Westmoreland’s parish average is strong, but the map separates the brighter Negril and southern coastal belts from more moderate inland and eastern areas.

Local data guide · published 31 August 2026

Try a system size

What would that mean on a roof?

These figures estimate electricity from the panels, not money saved. A kWh is one unit of electricity on your bill; kW describes the panel system’s rated size. Your savings depend on when you use that electricity, whether you store it in a battery and whether you send any to JPS Jamaica.

Typical year

8,068 kWhabout 672 kWh per month on average

Middle half of locations

7,853–8,253 kWhDifferences between locations; your roof can change the result

Strongest month

March · 746 kWhLong-term average, not a forecast

Weakest month

June · 637 kWhAbout 15% below March

Colour map of modelled annual solar electricity output across Westmoreland. — **Annual solar electricity across Westmoreland**Each square is approximately 1 km. The stepped edge shows the source resolution rather than pretending the estimate is more precise.

About 1,530About 1,730 kWh/kWp

The parish is not one number

The western and southern coasts lead. Inland output is steadier.

The highest modelled output appears toward Negril and across parts of the southern side near Savanna-la-Mar and Bluefields. The interior and eastern side remain productive but generally lower.

For a coastal home, durability and safe roof attachment can be a bigger decision than chasing the last few percentage points of panel efficiency.

Cells analysed: 930
Central geographic range: 1,571–1,651
Typical variation: About ±3%

Month by month

How does solar output change through the year?

March is strongest in the long-term model. June produces about 85% of that output, so the annual figure should not be treated as twelve identical months.

678Jan

644Feb

746Mar

699Apr

673May

637Jun

661Jul

678Aug

665Sep

663Oct

660Nov

663Dec

Estimated monthly generation in kWh for the selected system size. Hover, tap or focus a bar for its detailed value. The figures are long-term estimates, not a weather forecast.

View the monthly figures as a table

Month	Per installed kW	5 kW system
January	135.7 kWh	678 kWh
February	128.8 kWh	644 kWh
March	149.2 kWh	746 kWh
April	139.8 kWh	699 kWh
May	134.5 kWh	673 kWh
June	127.5 kWh	637 kWh
July	132.3 kWh	661 kWh
August	135.6 kWh	678 kWh
September	133.0 kWh	665 kWh
October	132.7 kWh	663 kWh
November	132.1 kWh	660 kWh
December	132.6 kWh	663 kWh

Before asking for quotes

Questions worth asking in Westmoreland.

Is every exposed component coastal-ready?Salt affects module frames, rails, fasteners, cable glands and outdoor enclosures. Ask which exact warranties apply at the property’s distance from the sea.
What happens in hurricane winds?Coastal exposure requires a site-specific mounting layout and sound roof structure. Ballast blocks on a roof are not a substitute for engineered attachment.
Where does afternoon shade fall?Large trees and neighbouring roofs can reduce late-day production—the period many homes value most before the evening peak.
Does the system match daytime demand?Tourism-related or home-business daytime loads can suit solar well, while a mostly empty home may export much more of its generation.

Use the Jamaica panel and roof guide to test the mounting and equipment answers in a quotation.

Generation is not the bill

A 5 kW system making 672 kWh a month will not automatically erase the same-sized bill.

Timing decides value

Solar used in the home avoids the retail cost of a JPS Jamaica unit. Surplus sent through net billing receives a much lower export credit.

A battery moves energy

A battery can carry daytime generation into evening use and provide outage cover, but it does not make the panels generate more.

Your roof changes the result

Shade, direction, heat, dirt, cable losses and equipment choices move a real installation away from the parish benchmark. Use the panel guide to test those roof assumptions.

How we calculated this

Where do these estimates come from?

We use long-term sunshine data to estimate panel output across the parish. These are planning averages, not a forecast for your roof. Shade, roof direction and equipment can change the result.

See the data, calculation and source assumptions

We selected the 930 Global Solar Atlas PVOUT grid cells whose centres fall inside the Westmoreland parish boundary, then calculated the annual mean, central 50% range and monthly means.

The source models a free-standing crystalline-silicon system at optimum fixed tilt. It is useful for parish comparison and early planning, not a guarantee for a particular roof.

Solar source: Global Solar Atlas 2.0 PVOUT
Source years: 1999–2018 long-term average
Spatial resolution: 30 arc-seconds, approximately 1 km
Calculation: Jamaica Solar Check parish aggregation

Solar data obtained from Global Solar Atlas 2.0, developed and operated by Solargis on behalf of the World Bank Group with ESMAP funding. Source data © 2019 Solargis, CC BY 4.0. Parish calculations and colour map are adaptations by Jamaica Solar Check; the source organisations do not endorse this site. Boundary geometry: geoBoundaries JAM ADM1, sourced from OpenStreetMap/Wambacher, CC BY-SA 2.0.