Grantham weather in July

In July, Grantham sees average daytime highs of 21°C and overnight lows near 13°C, with 63 mm of rain across 10.9 wet days and about 16.1 hours of daylight. It is the 1st-warmest and 3rd-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 12% of the time in July, and the air most often feels dry.

Daylight stretches from about 16 h 36 min at the start of July to 15 h 30 min by month's end. Set against the rest of the year, July is Grantham's 3rd-clearest and 12th-windiest month. For the whole year in context, see Grantham's year-round climate.

Daytime high
21°
1st warmest
Overnight low
13°
12th coldest
Rainfall
63 mm
10.9 wet days
Daylight
16 h 12 min
4:02 AM – 8:14 PM
Cloud cover
71%
3rd clearest
Wind
14 km/h
12th windiest
Solar energy
4.85 kWh/m²
Travel score
6.2
out of 10

Grantham is market town and civil parish in South Kesteven, Lincolnshire, England.

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

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 Grantham reaches about 21°C in the afternoon and slips back to 13°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 17°C and 26°C. Set against its neighbours, July runs about 2°C warmer than June and on par with August.

10°15°20°25°30°151015202531
Avg high (°C)Avg low (°C)
12012
22012
32012
42112
52112
62112
72112
82112
92112
102113
112113
122113
132113
142113
152113
162113
172113
182213
192213
202213
212213
222213
232213
242213
252213
262213
272213
282213
292213
302213
312213

How July really feels in Grantham

Once humidity and wind are folded in, July averages 0 days that feel above 32°C and 0 that feel at or below 0°C — the comfort signal a plain temperature reading hides.

Days feeling ≥ 32°C
0
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

July sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Grantham weather by month

How July compares with the rest of the year at a glance. July is the 1st-warmest and 3rd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / 4811.31.17.90.8
Feb / 389.51.49.51.2
Mar10° / 4410.20.911.52.2
Apr13° / 5111.10.213.63.4
May16° / 5310.8015.54.7
Jun19° / 11°6411.3016.65.6
Jul21° / 13°6310.9016.16.2
Aug21° / 13°6511014.56.1
Sep18° / 10°549.4012.45.7
Oct14° / 6010.9010.33.9
Nov10° / 56110.28.42.1
Dec / 5311.11.17.41.0

Cloud cover in July

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 12% of the time in July.

Beyond those clear spells, partly cloudy skies cover about 18% of July, with mostly cloudy or overcast conditions the remaining 70%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
12674
22773
32773
42773
52872
62773
72773
82872
92872
102971
112971
122971
133070
143070
153070
163070
173070
183169
193169
203169
213268
223268
233169
243169
253268
263367
273367
283466
293466
303466
313565

Chance of precipitation in July

Any precipitation

Grantham gets around 63 mm of rain over 10.9 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 35% and peaks near 37% on the wettest days.

0%10%20%30%40%50%151015202531
Rain chance (%)
135
235
335
435
534
634
734
834
934
1034
1133
1233
1333
1433
1533
1633
1733
1833
1934
2034
2135
2235
2336
2436
2536
2637
2737
2837
2937
3037
3137

Humidity in July

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, July lands in the dry band about 67% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)
176213
275223
374233
474242
573252
671272
771272
870282
969292
1069292
1168293
1268293
1368293
1467294
1567294
1667294
1767285
1866295
1965296
2065296
2165296
2264297
2364297
2463307
2562308
2661318
2761318
2861318
2960328
3060328
3159329

Wind in July

Winds average 14 km/h in July, the calmest month.

Across July, daily wind ranges from about 14 km/h on the calmest days to 14 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202531
Wind speed (km/h)Feels
114light breeze
214light breeze
314light breeze
414light breeze
514light breeze
614light breeze
714light breeze
814light breeze
914light breeze
1014light breeze
1114light breeze
1214light breeze
1314light breeze
1414light breeze
1514light breeze
1614light breeze
1714light breeze
1814light breeze
1914light breeze
2014light breeze
2114light breeze
2214light breeze
2314light breeze
2414light breeze
2514light breeze
2614light breeze
2714light breeze
2814light breeze
2914light breeze
3014light breeze
3114light breeze

Sunrise & sunset in July

DaylightNight

Daylight runs from about 16 h 36 min at the start of July to 15 h 30 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 66 minutes over July. Sunrise moves from 3:48 AM to 4:24 AM, and sunset from 8:24 PM to 7:54 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
116.63:488:24
216.63:488:24
316.63:498:23
416.63:508:23
516.53:518:23
616.53:528:22
716.53:528:21
816.53:538:21
916.43:548:20
1016.43:558:19
1116.43:568:19
1216.33:588:18
1316.33:598:17
1416.34:008:16
1516.24:018:15
1616.24:028:14
1716.24:038:13
1816.14:058:12
1916.14:068:11
2016.04:078:10
2116.04:098:08
2215.94:108:07
2315.94:128:06
2415.94:138:04
2515.84:158:03
2615.84:168:01
2715.74:188:00
2815.74:197:58
2915.64:217:57
3015.64:227:55
3115.54:247:54

Solar energy in July

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in July, about 4.85 kWh/m².

For context, solar energy here swings from a low near 0.58 kWh/m² to a high of 4.95 kWh/m² in June across the year — July's 4.85 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
15.0Bright
25.0Bright
35.0Bright
45.0Bright
55.0Bright
65.0Bright
75.0Bright
85.0Bright
95.0Bright
105.0Bright
114.9Bright
124.9Bright
134.9Bright
144.9Bright
154.9Bright
164.9Bright
174.9Bright
184.8Bright
194.8Bright
204.8Bright
214.8Bright
224.8Bright
234.8Bright
244.7Bright
254.7Bright
264.7Bright
274.7Bright
284.6Bright
294.6Bright
304.6Bright
314.6Bright
Planning a trip in July

Is July a good time to visit Grantham?

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

6.2
Sightseeing
1st-best month of the year
3.9
Beach & pool
1st-best month of the year

July is a reasonable time to visit Grantham for sightseeing.

What to pack for Grantham in July

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

In July, Grantham sees daytime highs around 21°C and nights near 13°C. Worth packing: rain gear and sun protection. About 11 days see rain.

rain gearsun protection

Sea temperature near Grantham in July

The nearest coast averages about 17°C in July — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 68 km away) is warmest in August at about 18°C and coldest in February near 5°C.

The water stays below 20°C all year — cool enough that most swimmers want a wetsuit.

5°10°15°20°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshing
Sea temperature (°C)Comfort
Jan6Bracing
Feb5Bracing
Mar6Bracing
Apr8Bracing
May11Bracing
Jun14Bracing
Jul17Cool
Aug18Cool
Sep16Cool
Oct13Bracing
Nov10Bracing
Dec7Bracing

UV index in Grantham in July

LowModerateHighVery highExtreme

Clear-sky midday UV in July peaks around 6 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Grantham peaks around August 11 at about 6 (high) — sunscreen and a hat are worth it in the middle of the day. It bottoms out near January 1 at about 1 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 6 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighModerateLowAug 11UV 6Jan 1UV 1
UV index (midday)Level
Jan1Low
Feb1Low
Mar3Moderate
Apr3Moderate
May5High
Jun6High
Jul6High
Aug6High
Sep4Moderate
Oct2Low
Nov1Low
Dec1Low
Location & terrain

Where is Grantham?

Grantham sits at 52.9°N, 0.6°W, 64 m above sea level, in United Kingdom. The nearest listed city is Sleaford, 18 km away.

Topography around Grantham

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

Within 3 km, the terrain around Grantham has only modest variations in elevation — a maximum elevation change of 90 m around an average of 84 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 170 m; within 80 km, significant variations in elevation — a maximum elevation change of 494 m.

The land around Grantham is covered by cropland (31%), artificial surfaces (26%) and trees (22%) within 3 km, cropland (66%) and grassland (21%) within 16 km, and cropland (53%) and grassland (25%) within 80 km.

3 km
90 m
16 km
170 m
80 km
494 m
treesgrasslandcroplandartificial surfaceswater
July weather nearby: Sleaford 18 km · Newark on Trent 21 km · Melton Mowbray 23 km · Stamford 31 km · West Bridgford 32 km · Arnold 34 km · Nottingham 34 km · Spalding 36 km

United Kingdom travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type D / G / M
230 V · 50 Hz
Prices
≈ 89% of US
price level, 2025
GDP per capita
$57,602
2025
Happiness
6.7 / 10
World Happiness, 2025
Safe drinking water
100%
of population, 2024
Homicide rate
1.1
per 100k, 2021
Road deaths
3.2
per 100k/yr, 2019
Income group
High
World Bank
Religion
Christian 60%none 26%Muslim 4%other 2%

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 Grantham (52.9115°, -0.6418°, elevation 64 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).