Jamestown weather in July

In July, Jamestown sees average daytime highs of 21°C and overnight lows near 20°C, with 3 mm of rain across 0.5 wet days and about 11.1 hours of daylight. It is the 8th-warmest and 4th-wettest month of the year here.

Day-to-day highs hold fairly steady near 21°C through the month. The sky is clear or mostly clear about 15% of the time in July, and the air most often feels comfortable.

Daylight stretches from about 11 h 06 min at the start of July to 11 h 18 min by month's end. Set against the rest of the year, July is Jamestown's 9th-clearest and 4th-windiest month. For the whole year in context, see Jamestown's year-round climate.

Daytime high: 21°; 8th warmest
Overnight low: 20°; 5th coldest
Rainfall: 3 mm; 0.5 wet days
Daylight: 11 h 06 min; 6:54 AM – 6:03 PM
Cloud cover: 62%; 9th clearest
Wind: 27 km/h; 4th windiest
Solar energy: 4 kWh/m²
Travel score: 7.7; out of 10

Jamestown is capital of Saint Helena.

Density: 177/km²; people per km²
Founded: 1659

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

← June Jamestown year-round climate August →Best places to visit in July

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

Temperature in July

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 21°C through the month.

A typical July day in Jamestown reaches about 21°C in the afternoon and slips back to 20°C overnight — a 1°C spread between the day's warmth and the night's chill. On most days the high lands between 20°C and 21°C. Set against its neighbours, July runs about 1°C cooler than June and on par with August.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Avg high (°C)	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	21	20	20	20	20	20	20	20	20	20	20	20	20
Avg low (°C)	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	19	19	19

	Avg high (°C)	Avg low (°C)
1	21	20
2	21	20
3	21	20
4	21	20
5	21	20
6	21	20
7	21	20
8	21	20
9	21	20
10	21	20
11	21	20
12	21	20
13	21	20
14	21	20
15	21	20
16	21	20
17	21	20
18	21	20
19	21	20
20	20	20
21	20	20
22	20	20
23	20	20
24	20	20
25	20	20
26	20	20
27	20	20
28	20	20
29	20	19
30	20	19
31	20	19

Jamestown weather by month

How July compares with the rest of the year at a glance. July is the 8th-warmest and 4th-wettest month here — the current month is highlighted below.

Month	High / Low (°C)	Rainfall (mm)	Wet days	Daylight (hours)	Travel score
Jan	23° / 22°	2	0.4	12.8	8.6
Feb	24° / 23°	3	0.6	12.5	8.8
Mar	24° / 24°	5	1.4	12.1	8.7
Apr	24° / 23°	3	0.6	11.7	8.7
May	23° / 22°	4	1.1	11.3	8.3
Jun	22° / 21°	5	1.1	11.1	7.9
Jul	21° / 20°	3	0.5	11.1	7.7
Aug	20° / 19°	2	0.3	11.5	7.4
Sep	20° / 19°	1	0.1	11.9	7.3
Oct	20° / 19°	1	0.1	12.4	7.4
Nov	20° / 20°	1	0	12.7	7.7
Dec	21° / 21°	1	0	12.9	8.2

Cloud cover in July

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 15% of the time in July.

Beyond those clear spells, partly cloudy skies cover about 28% of July, with mostly cloudy or overcast conditions the remaining 56%.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Clearer (%)	46	45	45	45	45	45	45	44	44	44	44	43	43	43	43	43	43	43	44	44	44	45	45	44	44	44	44	44	43	43	43
Cloudier (%)	54	55	55	55	55	55	55	56	56	56	56	57	57	57	57	57	57	57	56	56	56	55	55	56	56	56	56	56	57	57	57

	Clearer (%)	Cloudier (%)
1	46	54
2	45	55
3	45	55
4	45	55
5	45	55
6	45	55
7	45	55
8	44	56
9	44	56
10	44	56
11	44	56
12	43	57
13	43	57
14	43	57
15	43	57
16	43	57
17	43	57
18	43	57
19	44	56
20	44	56
21	44	56
22	45	55
23	45	55
24	44	56
25	44	56
26	44	56
27	44	56
28	44	56
29	43	57
30	43	57
31	43	57

Chance of precipitation in July

Any precipitation

Jamestown gets around 3 mm of rain over 0.5 wet days in July. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 1% and peaks near 2% on the wettest days.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Rain chance (%)	2	2	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	2	2	2	2	2	2	2	2	2	2	2	2	2

	Rain chance (%)
1	2
2	2
3	1
4	1
5	1
6	1
7	1
8	1
9	1
10	1
11	1
12	1
13	1
14	1
15	1
16	1
17	1
18	1
19	2
20	2
21	2
22	2
23	2
24	2
25	2
26	2
27	2
28	2
29	2
30	2
31	2

Humidity in July

DryComfortableHumidMuggyOppressiveMiserable

Most of July feels comfortable — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, July lands in the comfortable band about 76% of days. It rarely turns muggy — the humid and sticky bands barely register.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Dry (%)	2	2	2	2	2	2	2	2	2	2	2	3	3	3	3	3	3	3	4	4	4	4	5	5	5	5	6	6	6	6	6
Comfortable (%)	67	68	69	70	71	72	73	73	74	74	75	74	75	75	76	76	77	78	78	78	79	80	79	80	80	81	81	81	81	82	82
Humid (%)	31	30	29	28	27	26	25	25	24	24	23	23	22	22	21	21	20	19	18	18	17	16	16	15	15	14	13	13	13	12	12

	Dry (%)	Comfortable (%)	Humid (%)
1	2	67	31
2	2	68	30
3	2	69	29
4	2	70	28
5	2	71	27
6	2	72	26
7	2	73	25
8	2	73	25
9	2	74	24
10	2	74	24
11	2	75	23
12	3	74	23
13	3	75	22
14	3	75	22
15	3	76	21
16	3	76	21
17	3	77	20
18	3	78	19
19	4	78	18
20	4	78	18
21	4	79	17
22	4	80	16
23	5	79	16
24	5	80	15
25	5	80	15
26	5	81	14
27	6	81	13
28	6	81	13
29	6	81	13
30	6	82	12
31	6	82	12

Wind in July

Winds average 27 km/h in July.

Across July, daily wind ranges from about 27 km/h on the calmest days to 28 km/h at its breeziest. It stays fairly steady from day to day.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Wind speed (km/h)	27	27	27	27	27	28	28	28	28	27	27	27	27	27	27	27	27	27	27	27	27	27	27	27	27	27	27	27	27	27	27
Feels	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy

	Wind speed (km/h)	Feels
1	27	breezy
2	27	breezy
3	27	breezy
4	27	breezy
5	27	breezy
6	28	breezy
7	28	breezy
8	28	breezy
9	28	breezy
10	27	breezy
11	27	breezy
12	27	breezy
13	27	breezy
14	27	breezy
15	27	breezy
16	27	breezy
17	27	breezy
18	27	breezy
19	27	breezy
20	27	breezy
21	27	breezy
22	27	breezy
23	27	breezy
24	27	breezy
25	27	breezy
26	27	breezy
27	27	breezy
28	27	breezy
29	27	breezy
30	27	breezy
31	27	breezy

Sunrise & sunset in July

DaylightNight

Daylight runs from about 11 h 06 min at the start of July to 11 h 18 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 12 minutes over July. Sunrise moves from 6:54 AM to 6:51 AM, and sunset from 5:58 PM to 6:07 PM.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Daylight (h)	11.1	11.1	11.1	11.1	11.1	11.1	11.1	11.1	11.1	11.1	11.1	11.1	11.1	11.1	11.1	11.1	11.1	11.2	11.2	11.2	11.2	11.2	11.2	11.2	11.2	11.2	11.2	11.2	11.2	11.3	11.3
Sunrise (AM)	6:54	6:54	6:54	6:55	6:55	6:55	6:55	6:55	6:55	6:55	6:55	6:55	6:55	6:55	6:54	6:54	6:54	6:54	6:54	6:54	6:54	6:53	6:53	6:53	6:53	6:52	6:52	6:52	6:52	6:51	6:51
Sunset (PM)	5:58	5:58	5:59	5:59	5:59	6:00	6:00	6:00	6:00	6:01	6:01	6:01	6:02	6:02	6:02	6:03	6:03	6:03	6:04	6:04	6:04	6:04	6:05	6:05	6:05	6:06	6:06	6:06	6:07	6:07	6:07

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	11.1	6:54	5:58
2	11.1	6:54	5:58
3	11.1	6:54	5:59
4	11.1	6:55	5:59
5	11.1	6:55	5:59
6	11.1	6:55	6:00
7	11.1	6:55	6:00
8	11.1	6:55	6:00
9	11.1	6:55	6:00
10	11.1	6:55	6:01
11	11.1	6:55	6:01
12	11.1	6:55	6:01
13	11.1	6:55	6:02
14	11.1	6:55	6:02
15	11.1	6:54	6:02
16	11.1	6:54	6:03
17	11.1	6:54	6:03
18	11.2	6:54	6:03
19	11.2	6:54	6:04
20	11.2	6:54	6:04
21	11.2	6:54	6:04
22	11.2	6:53	6:04
23	11.2	6:53	6:05
24	11.2	6:53	6:05
25	11.2	6:53	6:05
26	11.2	6:52	6:06
27	11.2	6:52	6:06
28	11.2	6:52	6:06
29	11.2	6:52	6:07
30	11.3	6:51	6:07
31	11.3	6:51	6:07

Solar energy in July

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in July, about 4 kWh/m².

For context, solar energy here swings from a low near 3.89 kWh/m² to a high of 7.11 kWh/m² in January across the year — July's 4 kWh/m² sits near the bottom.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Solar energy (kWh/m²)	3.8	3.8	3.9	3.9	3.9	3.9	3.9	3.9	3.9	3.9	3.9	3.9	4.0	4.0	4.0	4.0	4.0	4.0	4.0	4.0	4.1	4.1	4.1	4.1	4.1	4.2	4.2	4.2	4.2	4.2	4.2
Level	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright

	Solar energy (kWh/m²)	Level
1	3.8	Moderate
2	3.8	Moderate
3	3.9	Moderate
4	3.9	Moderate
5	3.9	Moderate
6	3.9	Moderate
7	3.9	Moderate
8	3.9	Moderate
9	3.9	Moderate
10	3.9	Moderate
11	3.9	Moderate
12	3.9	Moderate
13	4.0	Moderate
14	4.0	Moderate
15	4.0	Moderate
16	4.0	Bright
17	4.0	Bright
18	4.0	Bright
19	4.0	Bright
20	4.0	Bright
21	4.1	Bright
22	4.1	Bright
23	4.1	Bright
24	4.1	Bright
25	4.1	Bright
26	4.2	Bright
27	4.2	Bright
28	4.2	Bright
29	4.2	Bright
30	4.2	Bright
31	4.2	Bright

Planning a trip in July

Is July a good time to visit Jamestown?

Our two travel scores rate July for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

7.7

Sightseeing

8th-best month of the year

4.4

Beach & pool

8th-best month of the year

July is one of the better times to visit Jamestown for general sightseeing.

What to pack for Jamestown in July

From July's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In July, Jamestown sees daytime highs around 21°C and nights near 20°C. Worth packing: a windbreaker.

a windbreaker

Sea temperature near Jamestown in July

The nearest coast averages about 22°C in July — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea offshore is warmest in March at about 25°C and coldest in October near 20°C.

The water stays above 20°C all year — warm enough for a swim any month.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Sea temperature (°C)	23	24	25	25	24	23	22	21	20	20	21	22
Comfort	Refreshing	Warm	Warm	Warm	Refreshing	Refreshing	Refreshing	Refreshing	Refreshing	Refreshing	Refreshing	Refreshing

	Sea temperature (°C)	Comfort
Jan	23	Refreshing
Feb	24	Warm
Mar	25	Warm
Apr	25	Warm
May	24	Refreshing
Jun	23	Refreshing
Jul	22	Refreshing
Aug	21	Refreshing
Sep	20	Refreshing
Oct	20	Refreshing
Nov	21	Refreshing
Dec	22	Refreshing

UV index in Jamestown in July

LowModerateHighVery highExtreme

Clear-sky midday UV in July peaks around 8 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Jamestown peaks around January 20 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 21 at about 8 (very high).

The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
UV index (midday)	14	13	13	11	9	8	8	8	10	11	13	12
Level	Extreme	Extreme	Extreme	Extreme	Very high	Very high	Very high	Very high	Very high	Extreme	Extreme	Extreme

	UV index (midday)	Level
Jan	14	Extreme
Feb	13	Extreme
Mar	13	Extreme
Apr	11	Extreme
May	9	Very high
Jun	8	Very high
Jul	8	Very high
Aug	8	Very high
Sep	10	Very high
Oct	11	Extreme
Nov	13	Extreme
Dec	12	Extreme

Location & terrain

Where is Jamestown?

Jamestown sits at 15.9°S, 5.7°W, 10 m above sea level, in Saint Helena. The nearest listed city is Tômbua, 1,878 km away.

Topography around Jamestown

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Jamestown.

Within 3 km, the terrain around Jamestown has significant variations in elevation — a maximum elevation change of 581 m around an average of 155 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 795 m; within 80 km, large variations in elevation — a maximum elevation change of 766 m.

The land around Jamestown is covered by water (44%) and shrubs (27%) within 3 km, water (85%) within 16 km, and water (97%) within 80 km.

3 km

581 m

water 44%

16 km

795 m

water 85%

80 km

766 m

water 97%

treesshrubsgrasslandcroplandartificial surfacesbare terrainwater

← June Jamestown year-round climate August →Best places to visit in July

July weather nearby: Tômbua 1,878 km · Mossamedes 1,915 km · Virei 1,997 km · Camucuio 2,045 km · Dombe Grande 2,053 km · Lubango 2,062 km · Baía Farta 2,071 km · Navegantes 2,092 km

Saint Helena travel facts

Power plugs: Type G; 230 V · 50 Hz

Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.

Data sources

Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Jamestown (-15.9249°, -5.7182°, elevation 10 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).

	Avg high (°C)	Avg low (°C)
1	21	20
2	21	20
3	21	20
4	21	20
5	21	20
6	21	20
7	21	20
8	21	20
9	21	20
10	21	20
11	21	20
12	21	20
13	21	20
14	21	20
15	21	20
16	21	20
17	21	20
18	21	20
19	21	20
20	20	20
21	20	20
22	20	20
23	20	20
24	20	20
25	20	20
26	20	20
27	20	20
28	20	20
29	20	19
30	20	19
31	20	19

	Clearer (%)	Cloudier (%)
1	46	54
2	45	55
3	45	55
4	45	55
5	45	55
6	45	55
7	45	55
8	44	56
9	44	56
10	44	56
11	44	56
12	43	57
13	43	57
14	43	57
15	43	57
16	43	57
17	43	57
18	43	57
19	44	56
20	44	56
21	44	56
22	45	55
23	45	55
24	44	56
25	44	56
26	44	56
27	44	56
28	44	56
29	43	57
30	43	57
31	43	57

	Rain chance (%)
1	2
2	2
3	1
4	1
5	1
6	1
7	1
8	1
9	1
10	1
11	1
12	1
13	1
14	1
15	1
16	1
17	1
18	1
19	2
20	2
21	2
22	2
23	2
24	2
25	2
26	2
27	2
28	2
29	2
30	2
31	2

	Dry (%)	Comfortable (%)	Humid (%)
1	2	67	31
2	2	68	30
3	2	69	29
4	2	70	28
5	2	71	27
6	2	72	26
7	2	73	25
8	2	73	25
9	2	74	24
10	2	74	24
11	2	75	23
12	3	74	23
13	3	75	22
14	3	75	22
15	3	76	21
16	3	76	21
17	3	77	20
18	3	78	19
19	4	78	18
20	4	78	18
21	4	79	17
22	4	80	16
23	5	79	16
24	5	80	15
25	5	80	15
26	5	81	14
27	6	81	13
28	6	81	13
29	6	81	13
30	6	82	12
31	6	82	12

	Avg high (°C)	Avg low (°C)
1	21	20
2	21	20
3	21	20
4	21	20
5	21	20
6	21	20
7	21	20
8	21	20
9	21	20
10	21	20
11	21	20
12	21	20
13	21	20
14	21	20
15	21	20
16	21	20
17	21	20
18	21	20
19	21	20
20	20	20
21	20	20
22	20	20
23	20	20
24	20	20
25	20	20
26	20	20
27	20	20
28	20	20
29	20	19
30	20	19
31	20	19

	Clearer (%)	Cloudier (%)
1	46	54
2	45	55
3	45	55
4	45	55
5	45	55
6	45	55
7	45	55
8	44	56
9	44	56
10	44	56
11	44	56
12	43	57
13	43	57
14	43	57
15	43	57
16	43	57
17	43	57
18	43	57
19	44	56
20	44	56
21	44	56
22	45	55
23	45	55
24	44	56
25	44	56
26	44	56
27	44	56
28	44	56
29	43	57
30	43	57
31	43	57

	Rain chance (%)
1	2
2	2
3	1
4	1
5	1
6	1
7	1
8	1
9	1
10	1
11	1
12	1
13	1
14	1
15	1
16	1
17	1
18	1
19	2
20	2
21	2
22	2
23	2
24	2
25	2
26	2
27	2
28	2
29	2
30	2
31	2

	Dry (%)	Comfortable (%)	Humid (%)
1	2	67	31
2	2	68	30
3	2	69	29
4	2	70	28
5	2	71	27
6	2	72	26
7	2	73	25
8	2	73	25
9	2	74	24
10	2	74	24
11	2	75	23
12	3	74	23
13	3	75	22
14	3	75	22
15	3	76	21
16	3	76	21
17	3	77	20
18	3	78	19
19	4	78	18
20	4	78	18
21	4	79	17
22	4	80	16
23	5	79	16
24	5	80	15
25	5	80	15
26	5	81	14
27	6	81	13
28	6	81	13
29	6	81	13
30	6	82	12
31	6	82	12

	Avg high (°C)	Avg low (°C)
1	21	20
2	21	20
3	21	20
4	21	20
5	21	20
6	21	20
7	21	20
8	21	20
9	21	20
10	21	20
11	21	20
12	21	20
13	21	20
14	21	20
15	21	20
16	21	20
17	21	20
18	21	20
19	21	20
20	20	20
21	20	20
22	20	20
23	20	20
24	20	20
25	20	20
26	20	20
27	20	20
28	20	20
29	20	19
30	20	19
31	20	19

	Clearer (%)	Cloudier (%)
1	46	54
2	45	55
3	45	55
4	45	55
5	45	55
6	45	55
7	45	55
8	44	56
9	44	56
10	44	56
11	44	56
12	43	57
13	43	57
14	43	57
15	43	57
16	43	57
17	43	57
18	43	57
19	44	56
20	44	56
21	44	56
22	45	55
23	45	55
24	44	56
25	44	56
26	44	56
27	44	56
28	44	56
29	43	57
30	43	57
31	43	57

	Rain chance (%)
1	2
2	2
3	1
4	1
5	1
6	1
7	1
8	1
9	1
10	1
11	1
12	1
13	1
14	1
15	1
16	1
17	1
18	1
19	2
20	2
21	2
22	2
23	2
24	2
25	2
26	2
27	2
28	2
29	2
30	2
31	2

	Dry (%)	Comfortable (%)	Humid (%)
1	2	67	31
2	2	68	30
3	2	69	29
4	2	70	28
5	2	71	27
6	2	72	26
7	2	73	25
8	2	73	25
9	2	74	24
10	2	74	24
11	2	75	23
12	3	74	23
13	3	75	22
14	3	75	22
15	3	76	21
16	3	76	21
17	3	77	20
18	3	78	19
19	4	78	18
20	4	78	18
21	4	79	17
22	4	80	16
23	5	79	16
24	5	80	15
25	5	80	15
26	5	81	14
27	6	81	13
28	6	81	13
29	6	81	13
30	6	82	12
31	6	82	12