Best time to go

Guadalcanal Island in September 2026: weather, temperatures and activities

Do you want to visit Guadalcanal Island in September 2026? Discover the usual weather at this time of year, average temperatures, the risk of rain, possible activities, and our opinion on whether September is a good month to travel to Guadalcanal Island, Solomon Islands.

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Is it worth visiting Guadalcanal Island in September?

Check your ideal travel criteria and see if the month of September suits your plans to go to Guadalcanal Island.
What matters most?
Guadalcanal Island in September 2026: weather, temperatures and activities

Page summary

Guadalcanal Island in September in summary
Fair weather
Min 26°C Max 30°C 354 mm 19 day(s) 84% 43% 30°C UV 6 10.2 h/day
Best activities in September
Beach and swimmingAnimal observationDiving and snorkelingWatersportsNature and landscapesBoat trip and cruise
Practical guidelines
Very large crowds 06:13 18:16
Hourly weather

Average weather in Guadalcanal Island in September 2026

Fair weather

The weather in Guadalcanal Island in September 2026 is based on statistical data from previous years in September. This allows you to forecast the weather in September 2026. Check the hourly statistics (6:00, 9:00, 12:00, 15:00, 18:00, 21:00, 0:00 and 3:00), with the associated average temperature, for the whole month, and also, by navigating the tabs, for the beginning, middle and end of the month.

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Climate

Climate of Guadalcanal Island in September

Temperatures, precipitation and monthly trends help to better understand the climate in Guadalcanal Island in September.

Temperatures and rain in Guadalcanal Island in September

Average daily weather

Temperatures and rain day by day in September.
Minimal Average Maximums Average rainfall

Monthly temperatures

The month of September is highlighted to compare it quickly with the rest of the year.
Minimal Average Maximums

Monthly precipitation

The bar for the month under study is highlighted.
Average rainfall

About the climate in Guadalcanal Island in September

Seasonal normals

Seasonal normals of Guadalcanal Island in September

Check the seasonal normals in Guadalcanal Island in September and compare the weather with the previous month and the following month (or the months of your choice by selecting months in the form below): temperatures, wind, rain, humidity, climate rating...

Last updated: 12/01/2026
Reference period for normals: January 2009 - December 2025
Month analyzed
September
Weather data August September October
Outside temperature
Average temperature 27.7°C 28.1°C 28.3°C
Maximum temperature 29.4°C 29.8°C 30.0°C
Minimum temperature 25.9°C 26.4°C 26.7°C
Record maximum temperature 32.0°C
(2011)
34.0°C
(2021)
34.0°C
(2021)
Record low temperature 23.0°C
(2011)
23.0°C
(2015)
24.0°C
(2010)
Number of days at +30° 15 day(s)
(48%)
19 day(s)
(63%)
20 day(s)
(65%)
Number of days at +18° 31 day(s)
(100%)
30 day(s)
(100%)
31 day(s)
(100%)
Number of days below 0° 0 day(s)
(0%)
0 day(s)
(0%)
0 day(s)
(0%)
Sea temperature
Sea temperature (average) 28.7°C 28.7°C 29.2°C
Sea temperature (minimum) 27.5°C 27.7°C 28.2°C
Sea temperature (maximum) 29.9°C 30.0°C 30.2°C
Wind
Wind speed 13 km/h 12 km/h 10 km/h
Wind temperature 25.9°C 26.4°C 26.7°C
Precipitation (rain)
Precipitation 283.6 mm 353.9 mm 448.4 mm
Number of days with precipitation 26 day(s)
(84%)
27 day(s)
(90%)
29 day(s)
(94%)
Number of days with significant precipitation (greater than 5 mm) 17 day(s)
(55%)
19 day(s)
(62%)
21 day(s)
(67%)
Record precipitation in one day 76.3 mm
(2018)
129.5 mm
(2019)
91.4 mm
(2019)
Other weather data
Humidity 85% 84% 84%
Visibility 9.0 km 8.8 km 8.6 km
Cloud cover 44% 43% 44%
UV index 6 6 6
Daily sunshine 10h 10h 11h
Sunrise and sunset
Sunrise time 06h30 06h13 05h56
Sunset time 18h18 18h16 18h14
Day length 11h48 12h03 12h18
Our opinion on the climate in September
The review of Where And When fair weather fair weather adverse weather
Activities and events

What to do in Guadalcanal Island in September?

Best activities in September
Beach and swimmingAnimal observationDiving and snorkelingWatersportsNature and landscapesBoat trip and cruise
Observed weather

What was the weather like in Guadalcanal Island in September last?

Find the observed weather calendar in Guadalcanal Island in September 2025, with each day’s weather, temperatures and precipitation.

Mon. Tue. Wed. Thu. Fri. Sat. Sun.
1
Patchy rain nearby
24°C31°C0.4 mm
2
Patchy rain nearby
24°C30°C0.3 mm
3
Patchy rain nearby
25°C31°C0.4 mm
4
Patchy rain nearby
25°C31°C1.4 mm
5
Cloudy
25°C30°C0.5 mm
6
Patchy rain nearby
25°C31°C0.1 mm
7
Patchy rain nearby
25°C31°C0.4 mm
8
Patchy rain nearby
25°C30°C0.7 mm
9
Light rain shower
25°C28°C7.9 mm
10
Patchy rain nearby
25°C29°C2.8 mm
11
Patchy rain nearby
25°C29°C3.2 mm
12
Patchy rain nearby
25°C28°C2.2 mm
13
Light rain shower
25°C29°C7.1 mm
14
Light rain shower
25°C28°C4.1 mm
15
Patchy rain nearby
24°C30°C0.8 mm
16
Patchy rain nearby
25°C31°C0.6 mm
17
Patchy rain nearby
25°C30°C1.1 mm
18
Patchy rain nearby
25°C30°C0.4 mm
19
Patchy rain nearby
25°C30°C0.3 mm
20
Patchy rain nearby
24°C30°C2.8 mm
21
Light rain shower
24°C28°C4.9 mm
22
Patchy rain nearby
24°C28°C2.8 mm
23
Patchy rain nearby
25°C28°C4.1 mm
24
Patchy rain nearby
24°C28°C1.0 mm
25
Patchy rain nearby
24°C30°C0.2 mm
26
Patchy rain nearby
24°C30°C1.7 mm
27
Light rain shower
25°C29°C2.6 mm
28
Patchy rain nearby
25°C30°C3.6 mm
29
Patchy rain nearby
26°C27°C1.3 mm
30
Patchy rain nearby
25°C29°C1.4 mm
Nearby

Where to go near Guadalcanal Island in September?

Compare cities and destinations near Guadalcanal Island in September to find another travel stop, a nearby alternative or a logical continuation of your stay in Guadalcanal Island.

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Every month

Best time to visit Guadalcanal Island month by month

Compare the weather in Guadalcanal Island across all months of the year and open each detailed page to find the best time.

Frequently asked questions

Travel to to Guadalcanal Island in September: your frequently asked questions

Short answers to the questions we ask ourselves before booking for this month.

It's an average period, nothing special. Conditions are mediocre in Guadalcanal Island in September, which ranks this month 4th out of 12. The choice of region will make a real difference.

Expect an average of 30°C during the day and 26°C at night, with about 354 mm of precipitation spread over 19 rainy days.

Yes: the sea is 29°C on average in September, a pleasant temperature for swimming.

Expect about 10.2 hours of sunshine per day on average for this month.

This month is particularly suited to these activities: Beach and swimming, Animal observation, Diving and snorkeling and Watersports. These are the ones for which the conditions on site are most favourable.

Yes: this month is in Very large crowds, with a visitor index of 96/100. Book your accommodation and transportation well in advance.
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Temperatures are shown in degrees Celsius and precipitation in millimetres. Based on your country of connection, °F and inches may be more familiar to you.